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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
/* base class of all rendering objects */
#include "nsIFrame.h"
#include <stdarg.h>
#include <algorithm>
#include "gfx2DGlue.h"
#include "gfxUtils.h"
#include "mozilla/Attributes.h"
#include "mozilla/CaretAssociationHint.h"
#include "mozilla/ComputedStyle.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/DisplayPortUtils.h"
#include "mozilla/EventForwards.h"
#include "mozilla/FocusModel.h"
#include "mozilla/dom/CSSAnimation.h"
#include "mozilla/dom/CSSTransition.h"
#include "mozilla/dom/ContentVisibilityAutoStateChangeEvent.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/AncestorIterator.h"
#include "mozilla/dom/ElementInlines.h"
#include "mozilla/dom/ImageTracker.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/PathHelpers.h"
#include "mozilla/IntegerRange.h"
#include "mozilla/intl/BidiEmbeddingLevel.h"
#include "mozilla/Maybe.h"
#include "mozilla/PresShell.h"
#include "mozilla/PresShellInlines.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/ScrollContainerFrame.h"
#include "mozilla/SelectionMovementUtils.h"
#include "mozilla/Sprintf.h"
#include "mozilla/StaticAnalysisFunctions.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/StaticPrefs_print.h"
#include "mozilla/StaticPrefs_ui.h"
#include "mozilla/SVGMaskFrame.h"
#include "mozilla/SVGObserverUtils.h"
#include "mozilla/SVGTextFrame.h"
#include "mozilla/SVGIntegrationUtils.h"
#include "mozilla/SVGUtils.h"
#include "mozilla/TextControlElement.h"
#include "mozilla/ToString.h"
#include "mozilla/Try.h"
#include "mozilla/ViewportUtils.h"
#include "mozilla/WritingModes.h"
#include "nsCOMPtr.h"
#include "nsFieldSetFrame.h"
#include "nsFlexContainerFrame.h"
#include "nsFocusManager.h"
#include "nsFrameList.h"
#include "nsTextControlFrame.h"
#include "nsPlaceholderFrame.h"
#include "nsIBaseWindow.h"
#include "nsIContent.h"
#include "nsIContentInlines.h"
#include "nsContentUtils.h"
#include "nsCSSFrameConstructor.h"
#include "nsCSSProps.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSRendering.h"
#include "nsAtom.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsTableWrapperFrame.h"
#include "nsView.h"
#include "nsViewManager.h"
#include "nsPresContext.h"
#include "nsPresContextInlines.h"
#include "nsStyleConsts.h"
#include "mozilla/Logging.h"
#include "nsLayoutUtils.h"
#include "LayoutLogging.h"
#include "mozilla/RestyleManager.h"
#include "nsImageFrame.h"
#include "nsInlineFrame.h"
#include "nsFrameSelection.h"
#include "nsGkAtoms.h"
#include "nsGridContainerFrame.h"
#include "nsCSSAnonBoxes.h"
#include "nsCanvasFrame.h"
#include "nsFieldSetFrame.h"
#include "nsFrameTraversal.h"
#include "nsRange.h"
#include "nsNameSpaceManager.h"
#include "nsIPercentBSizeObserver.h"
#include "nsStyleStructInlines.h"
#include "nsBidiPresUtils.h"
#include "RubyUtils.h"
#include "TextOverflow.h"
#include "nsAnimationManager.h"
// For triple-click pref
#include "imgIRequest.h"
#include "nsError.h"
#include "nsContainerFrame.h"
#include "nsBlockFrame.h"
#include "nsDisplayList.h"
#include "nsChangeHint.h"
#include "nsSubDocumentFrame.h"
#include "RetainedDisplayListBuilder.h"
#include "gfxContext.h"
#include "nsAbsoluteContainingBlock.h"
#include "ScrollSnap.h"
#include "StickyScrollContainer.h"
#include "nsFontInflationData.h"
#include "nsRegion.h"
#include "nsIFrameInlines.h"
#include "nsStyleChangeList.h"
#include "nsWindowSizes.h"
#ifdef ACCESSIBILITY
# include "nsAccessibilityService.h"
#endif
#include "mozilla/AsyncEventDispatcher.h"
#include "mozilla/CSSClipPathInstance.h"
#include "mozilla/EffectCompositor.h"
#include "mozilla/EffectSet.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/Preferences.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/ServoStyleSet.h"
#include "mozilla/ServoStyleSetInlines.h"
#include "mozilla/css/ImageLoader.h"
#include "mozilla/dom/HTMLBodyElement.h"
#include "mozilla/dom/SVGPathData.h"
#include "mozilla/dom/TouchEvent.h"
#include "mozilla/gfx/Tools.h"
#include "mozilla/layers/WebRenderUserData.h"
#include "mozilla/layout/ScrollAnchorContainer.h"
#include "nsPrintfCString.h"
#include "ActiveLayerTracker.h"
#include "nsITheme.h"
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
using namespace mozilla::gfx;
using namespace mozilla::layers;
using namespace mozilla::layout;
typedef nsAbsoluteContainingBlock::AbsPosReflowFlags AbsPosReflowFlags;
using nsStyleTransformMatrix::TransformReferenceBox;
nsIFrame* nsILineIterator::LineInfo::GetLastFrameOnLine() const {
if (!mNumFramesOnLine) {
return nullptr; // empty line, not illegal
}
MOZ_ASSERT(mFirstFrameOnLine);
nsIFrame* maybeLastFrame = mFirstFrameOnLine;
for ([[maybe_unused]] int32_t i : IntegerRange(mNumFramesOnLine - 1)) {
maybeLastFrame = maybeLastFrame->GetNextSibling();
if (NS_WARN_IF(!maybeLastFrame)) {
return nullptr;
}
}
return maybeLastFrame;
}
#ifdef HAVE_64BIT_BUILD
static_assert(sizeof(nsIFrame) == 120, "nsIFrame should remain small");
#else
static_assert(sizeof(void*) == 4, "Odd build config?");
// FIXME(emilio): Investigate why win32 and android-arm32 have bigger sizes (80)
// than Linux32 (76).
static_assert(sizeof(nsIFrame) <= 80, "nsIFrame should remain small");
#endif
const mozilla::LayoutFrameType nsIFrame::sLayoutFrameTypes[kFrameClassCount] = {
#define FRAME_ID(class_, type_, ...) mozilla::LayoutFrameType::type_,
#define ABSTRACT_FRAME_ID(...)
#include "mozilla/FrameIdList.h"
#undef FRAME_ID
#undef ABSTRACT_FRAME_ID
};
const nsIFrame::ClassFlags nsIFrame::sLayoutFrameClassFlags[kFrameClassCount] =
{
#define FRAME_ID(class_, type_, flags_, ...) flags_,
#define ABSTRACT_FRAME_ID(...)
#include "mozilla/FrameIdList.h"
#undef FRAME_ID
#undef ABSTRACT_FRAME_ID
};
std::ostream& operator<<(std::ostream& aStream, const nsDirection& aDirection) {
return aStream << (aDirection == eDirNext ? "eDirNext" : "eDirPrevious");
}
struct nsContentAndOffset {
nsIContent* mContent = nullptr;
int32_t mOffset = 0;
};
#include "nsILineIterator.h"
#include "prenv.h"
// Utility function to set a nsRect-valued property table entry on aFrame,
// reusing the existing storage if the property happens to be already set.
template <typename T>
static void SetOrUpdateRectValuedProperty(
nsIFrame* aFrame, FrameProperties::Descriptor<T> aProperty,
const nsRect& aNewValue) {
bool found;
nsRect* rectStorage = aFrame->GetProperty(aProperty, &found);
if (!found) {
rectStorage = new nsRect(aNewValue);
aFrame->AddProperty(aProperty, rectStorage);
} else {
*rectStorage = aNewValue;
}
}
FrameDestroyContext::~FrameDestroyContext() {
for (auto& content : mozilla::Reversed(mAnonymousContent)) {
mPresShell->NativeAnonymousContentWillBeRemoved(content);
content->UnbindFromTree();
}
}
// Formerly the nsIFrameDebug interface
std::ostream& operator<<(std::ostream& aStream, const nsReflowStatus& aStatus) {
char complete = 'Y';
if (aStatus.IsIncomplete()) {
complete = 'N';
} else if (aStatus.IsOverflowIncomplete()) {
complete = 'O';
}
char brk = 'N';
if (aStatus.IsInlineBreakBefore()) {
brk = 'B';
} else if (aStatus.IsInlineBreakAfter()) {
brk = 'A';
}
aStream << "["
<< "Complete=" << complete << ","
<< "NIF=" << (aStatus.NextInFlowNeedsReflow() ? 'Y' : 'N') << ","
<< "Break=" << brk << ","
<< "FirstLetter=" << (aStatus.FirstLetterComplete() ? 'Y' : 'N')
<< "]";
return aStream;
}
#ifdef DEBUG
/**
* Note: the log module is created during library initialization which
* means that you cannot perform logging before then.
*/
mozilla::LazyLogModule nsIFrame::sFrameLogModule("frame");
#endif
NS_DECLARE_FRAME_PROPERTY_DELETABLE(AbsoluteContainingBlockProperty,
nsAbsoluteContainingBlock)
bool nsIFrame::HasAbsolutelyPositionedChildren() const {
return IsAbsoluteContainer() &&
GetAbsoluteContainingBlock()->HasAbsoluteFrames();
}
nsAbsoluteContainingBlock* nsIFrame::GetAbsoluteContainingBlock() const {
NS_ASSERTION(IsAbsoluteContainer(),
"The frame is not marked as an abspos container correctly");
nsAbsoluteContainingBlock* absCB =
GetProperty(AbsoluteContainingBlockProperty());
NS_ASSERTION(absCB,
"The frame is marked as an abspos container but doesn't have "
"the property");
return absCB;
}
void nsIFrame::MarkAsAbsoluteContainingBlock() {
MOZ_ASSERT(HasAnyStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN));
NS_ASSERTION(!GetProperty(AbsoluteContainingBlockProperty()),
"Already has an abs-pos containing block property?");
NS_ASSERTION(!HasAnyStateBits(NS_FRAME_HAS_ABSPOS_CHILDREN),
"Already has NS_FRAME_HAS_ABSPOS_CHILDREN state bit?");
AddStateBits(NS_FRAME_HAS_ABSPOS_CHILDREN);
SetProperty(AbsoluteContainingBlockProperty(),
new nsAbsoluteContainingBlock(GetAbsoluteListID()));
}
void nsIFrame::MarkAsNotAbsoluteContainingBlock() {
NS_ASSERTION(!HasAbsolutelyPositionedChildren(), "Think of the children!");
NS_ASSERTION(GetProperty(AbsoluteContainingBlockProperty()),
"Should have an abs-pos containing block property");
NS_ASSERTION(HasAnyStateBits(NS_FRAME_HAS_ABSPOS_CHILDREN),
"Should have NS_FRAME_HAS_ABSPOS_CHILDREN state bit");
MOZ_ASSERT(HasAnyStateBits(NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN));
RemoveStateBits(NS_FRAME_HAS_ABSPOS_CHILDREN);
RemoveProperty(AbsoluteContainingBlockProperty());
}
bool nsIFrame::CheckAndClearPaintedState() {
bool result = HasAnyStateBits(NS_FRAME_PAINTED_THEBES);
RemoveStateBits(NS_FRAME_PAINTED_THEBES);
for (const auto& childList : ChildLists()) {
for (nsIFrame* child : childList.mList) {
if (child->CheckAndClearPaintedState()) {
result = true;
}
}
}
return result;
}
nsIFrame* nsIFrame::FindLineContainer() const {
MOZ_ASSERT(IsLineParticipant());
nsIFrame* parent = GetParent();
while (parent &&
(parent->IsLineParticipant() || parent->CanContinueTextRun())) {
parent = parent->GetParent();
}
return parent;
}
bool nsIFrame::CheckAndClearDisplayListState() {
bool result = BuiltDisplayList();
SetBuiltDisplayList(false);
for (const auto& childList : ChildLists()) {
for (nsIFrame* child : childList.mList) {
if (child->CheckAndClearDisplayListState()) {
result = true;
}
}
}
return result;
}
bool nsIFrame::IsVisibleConsideringAncestors(uint32_t aFlags) const {
if (!StyleVisibility()->IsVisible()) {
return false;
}
if (PresShell()->IsUnderHiddenEmbedderElement()) {
return false;
}
const nsIFrame* frame = this;
while (frame) {
nsView* view = frame->GetView();
if (view && view->GetVisibility() == ViewVisibility::Hide) {
return false;
}
if (frame->StyleUIReset()->mMozSubtreeHiddenOnlyVisually) {
return false;
}
// This method is used to determine if a frame is focusable, because it's
// called by nsIFrame::IsFocusable. `content-visibility: auto` should not
// force this frame to be unfocusable, so we only take into account
// `content-visibility: hidden` here.
if (this != frame &&
frame->HidesContent(IncludeContentVisibility::Hidden)) {
return false;
}
if (nsIFrame* parent = frame->GetParent()) {
frame = parent;
} else {
parent = nsLayoutUtils::GetCrossDocParentFrameInProcess(frame);
if (!parent) {
break;
}
if ((aFlags & nsIFrame::VISIBILITY_CROSS_CHROME_CONTENT_BOUNDARY) == 0 &&
parent->PresContext()->IsChrome() &&
!frame->PresContext()->IsChrome()) {
break;
}
frame = parent;
}
}
return true;
}
void nsIFrame::FindCloserFrameForSelection(
const nsPoint& aPoint, FrameWithDistance* aCurrentBestFrame) {
if (nsLayoutUtils::PointIsCloserToRect(aPoint, mRect,
aCurrentBestFrame->mXDistance,
aCurrentBestFrame->mYDistance)) {
aCurrentBestFrame->mFrame = this;
}
}
void nsIFrame::ElementStateChanged(mozilla::dom::ElementState aStates) {}
void WeakFrame::Clear(mozilla::PresShell* aPresShell) {
if (aPresShell) {
aPresShell->RemoveWeakFrame(this);
}
mFrame = nullptr;
}
AutoWeakFrame::AutoWeakFrame(const WeakFrame& aOther)
: mPrev(nullptr), mFrame(nullptr) {
Init(aOther.GetFrame());
}
void AutoWeakFrame::Clear(mozilla::PresShell* aPresShell) {
if (aPresShell) {
aPresShell->RemoveAutoWeakFrame(this);
}
mFrame = nullptr;
mPrev = nullptr;
}
AutoWeakFrame::~AutoWeakFrame() {
Clear(mFrame ? mFrame->PresContext()->GetPresShell() : nullptr);
}
void AutoWeakFrame::Init(nsIFrame* aFrame) {
Clear(mFrame ? mFrame->PresContext()->GetPresShell() : nullptr);
mFrame = aFrame;
if (mFrame) {
mozilla::PresShell* presShell = mFrame->PresContext()->GetPresShell();
NS_WARNING_ASSERTION(presShell, "Null PresShell in AutoWeakFrame!");
if (presShell) {
presShell->AddAutoWeakFrame(this);
} else {
mFrame = nullptr;
}
}
}
void WeakFrame::Init(nsIFrame* aFrame) {
Clear(mFrame ? mFrame->PresContext()->GetPresShell() : nullptr);
mFrame = aFrame;
if (mFrame) {
mozilla::PresShell* presShell = mFrame->PresContext()->GetPresShell();
MOZ_ASSERT(presShell, "Null PresShell in WeakFrame!");
if (presShell) {
presShell->AddWeakFrame(this);
} else {
mFrame = nullptr;
}
}
}
nsIFrame* NS_NewEmptyFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
return new (aPresShell) nsIFrame(aStyle, aPresShell->GetPresContext());
}
nsIFrame::~nsIFrame() {
MOZ_COUNT_DTOR(nsIFrame);
MOZ_ASSERT(GetVisibility() != Visibility::ApproximatelyVisible,
"Visible nsFrame is being destroyed");
}
NS_IMPL_FRAMEARENA_HELPERS(nsIFrame)
// Dummy operator delete. Will never be called, but must be defined
// to satisfy some C++ ABIs.
void nsIFrame::operator delete(void*, size_t) {
MOZ_CRASH("nsIFrame::operator delete should never be called");
}
NS_QUERYFRAME_HEAD(nsIFrame)
NS_QUERYFRAME_ENTRY(nsIFrame)
NS_QUERYFRAME_TAIL_INHERITANCE_ROOT
/////////////////////////////////////////////////////////////////////////////
// nsIFrame
static bool IsFontSizeInflationContainer(nsIFrame* aFrame,
const nsStyleDisplay* aStyleDisplay) {
/*
* Font size inflation is built around the idea that we're inflating
* the fonts for a pan-and-zoom UI so that when the user scales up a
* block or other container to fill the width of the device, the fonts
* will be readable. To do this, we need to pick what counts as a
* container.
*
* From a code perspective, the only hard requirement is that frames
* that are line participants (nsIFrame::IsLineParticipant) are never
* containers, since line layout assumes that the inflation is consistent
* within a line.
*
* This is not an imposition, since we obviously want a bunch of text
* (possibly with inline elements) flowing within a block to count the
* block (or higher) as its container.
*
* We also want form controls, including the text in the anonymous
* content inside of them, to match each other and the text next to
* them, so they and their anonymous content should also not be a
* container.
*
* However, because we can't reliably compute sizes across XUL during
* reflow, any XUL frame with a XUL parent is always a container.
*
* There are contexts where it would be nice if some blocks didn't
* count as a container, so that, for example, an indented quotation
* didn't end up with a smaller font size. However, it's hard to
* distinguish these situations where we really do want the indented
* thing to count as a container, so we don't try, and blocks are
* always containers.
*/
// The root frame should always be an inflation container.
if (!aFrame->GetParent()) {
return true;
}
nsIContent* content = aFrame->GetContent();
if (content && content->IsInNativeAnonymousSubtree()) {
// Native anonymous content shouldn't be a font inflation root,
// except for the canvas custom content container.
nsCanvasFrame* canvas = aFrame->PresShell()->GetCanvasFrame();
return canvas && canvas->GetCustomContentContainer() == content;
}
LayoutFrameType frameType = aFrame->Type();
bool isInline =
aFrame->GetDisplay().IsInlineFlow() || RubyUtils::IsRubyBox(frameType) ||
(aStyleDisplay->IsFloatingStyle() &&
frameType == LayoutFrameType::Letter) ||
// Given multiple frames for the same node, only the
// outer one should be considered a container.
// (Important, e.g., for nsSelectsAreaFrame.)
(aFrame->GetParent()->GetContent() == content) ||
(content &&
// Form controls shouldn't become inflation containers.
(content->IsAnyOfHTMLElements(nsGkAtoms::option, nsGkAtoms::optgroup,
nsGkAtoms::select, nsGkAtoms::input,
nsGkAtoms::button, nsGkAtoms::textarea)));
NS_ASSERTION(!aFrame->IsLineParticipant() || isInline ||
// br frames and mathml frames report being line
// participants even when their position or display is
// set
aFrame->IsBrFrame() || aFrame->IsMathMLFrame(),
"line participants must not be containers");
return !isInline;
}
static void MaybeScheduleReflowSVGNonDisplayText(nsIFrame* aFrame) {
if (!aFrame->IsInSVGTextSubtree()) {
return;
}
// We need to ensure that any non-display SVGTextFrames get reflowed when a
// child text frame gets new style. Thus we need to schedule a reflow in
// |DidSetComputedStyle|. We also need to call it from |DestroyFrom|,
// because otherwise we won't get notified when style changes to
// "display:none".
SVGTextFrame* svgTextFrame = static_cast<SVGTextFrame*>(
nsLayoutUtils::GetClosestFrameOfType(aFrame, LayoutFrameType::SVGText));
nsIFrame* anonBlock = svgTextFrame->PrincipalChildList().FirstChild();
// Note that we must check NS_FRAME_FIRST_REFLOW on our SVGTextFrame's
// anonymous block frame rather than our aFrame, since NS_FRAME_FIRST_REFLOW
// may be set on us if we're a new frame that has been inserted after the
// document's first reflow. (In which case this DidSetComputedStyle call may
// be happening under frame construction under a Reflow() call.)
if (!anonBlock || anonBlock->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
return;
}
if (!svgTextFrame->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY) ||
svgTextFrame->HasAnyStateBits(NS_STATE_SVG_TEXT_IN_REFLOW)) {
return;
}
svgTextFrame->ScheduleReflowSVGNonDisplayText(
IntrinsicDirty::FrameAncestorsAndDescendants);
}
bool nsIFrame::ShouldPropagateRepaintsToRoot() const {
if (!IsPrimaryFrame()) {
// special case for table frames because style images are associated to the
// table frame, but the table wrapper frame is the primary frame
if (IsTableFrame()) {
MOZ_ASSERT(GetParent() && GetParent()->IsTableWrapperFrame());
return GetParent()->ShouldPropagateRepaintsToRoot();
}
return false;
}
nsIContent* content = GetContent();
Document* document = content->OwnerDoc();
return content == document->GetRootElement() ||
content == document->GetBodyElement();
}
bool nsIFrame::IsRenderedLegend() const {
if (auto* parent = GetParent(); parent && parent->IsFieldSetFrame()) {
return static_cast<nsFieldSetFrame*>(parent)->GetLegend() == this;
}
return false;
}
void nsIFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
MOZ_ASSERT(nsQueryFrame::FrameIID(mClass) == GetFrameId());
MOZ_ASSERT(!mContent, "Double-initing a frame?");
mContent = aContent;
mParent = aParent;
MOZ_ASSERT(!mParent || PresShell() == mParent->PresShell());
if (aPrevInFlow) {
mWritingMode = aPrevInFlow->GetWritingMode();
// Copy some state bits from prev-in-flow (the bits that should apply
// throughout a continuation chain). The bits are sorted according to their
// order in nsFrameStateBits.h.
// clang-format off
AddStateBits(aPrevInFlow->GetStateBits() &
(NS_FRAME_GENERATED_CONTENT |
NS_FRAME_OUT_OF_FLOW |
NS_FRAME_CAN_HAVE_ABSPOS_CHILDREN |
NS_FRAME_INDEPENDENT_SELECTION |
NS_FRAME_PART_OF_IBSPLIT |
NS_FRAME_MAY_BE_TRANSFORMED |
NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR));
// clang-format on
// Copy other bits in nsIFrame from prev-in-flow.
mHasColumnSpanSiblings = aPrevInFlow->HasColumnSpanSiblings();
} else {
PresContext()->ConstructedFrame();
}
if (GetParent()) {
if (MOZ_UNLIKELY(mContent == PresContext()->Document()->GetRootElement() &&
mContent == GetParent()->GetContent())) {
// Our content is the root element and we have the same content as our
// parent. That is, we are the internal anonymous frame of the root
// element. Copy the used mWritingMode from our parent because
// mDocElementContainingBlock gets its mWritingMode from <body>.
mWritingMode = GetParent()->GetWritingMode();
}
// Copy some state bits from our parent (the bits that should apply
// recursively throughout a subtree). The bits are sorted according to their
// order in nsFrameStateBits.h.
// clang-format off
AddStateBits(GetParent()->GetStateBits() &
(NS_FRAME_GENERATED_CONTENT |
NS_FRAME_INDEPENDENT_SELECTION |
NS_FRAME_IS_SVG_TEXT |
NS_FRAME_IN_POPUP |
NS_FRAME_IS_NONDISPLAY));
// clang-format on
if (HasAnyStateBits(NS_FRAME_IN_POPUP) && TrackingVisibility()) {
// Assume all frames in popups are visible.
IncApproximateVisibleCount();
}
}
if (aPrevInFlow) {
mMayHaveOpacityAnimation = aPrevInFlow->MayHaveOpacityAnimation();
mMayHaveTransformAnimation = aPrevInFlow->MayHaveTransformAnimation();
} else if (mContent) {
// It's fine to fetch the EffectSet for the style frame here because in the
// following code we take care of the case where animations may target
// a different frame.
EffectSet* effectSet = EffectSet::GetForStyleFrame(this);
if (effectSet) {
mMayHaveOpacityAnimation = effectSet->MayHaveOpacityAnimation();
if (effectSet->MayHaveTransformAnimation()) {
// If we are the inner table frame for display:table content, then
// transform animations should go on our parent frame (the table wrapper
// frame).
//
// We do this when initializing the child frame (table inner frame),
// because when initializng the table wrapper frame, we don't yet have
// access to its children so we can't tell if we have transform
// animations or not.
if (SupportsCSSTransforms()) {
mMayHaveTransformAnimation = true;
AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED);
} else if (aParent && nsLayoutUtils::GetStyleFrame(aParent) == this) {
MOZ_ASSERT(
aParent->SupportsCSSTransforms(),
"Style frames that don't support transforms should have parents"
" that do");
aParent->mMayHaveTransformAnimation = true;
aParent->AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED);
}
}
}
}
const nsStyleDisplay* disp = StyleDisplay();
if (disp->HasTransform(this)) {
// If 'transform' dynamically changes, RestyleManager takes care of
// updating this bit.
AddStateBits(NS_FRAME_MAY_BE_TRANSFORMED);
}
if (nsLayoutUtils::FontSizeInflationEnabled(PresContext()) ||
!GetParent()
#ifdef DEBUG
// We have assertions that check inflation invariants even when
// font size inflation is not enabled.
|| true
#endif
) {
if (IsFontSizeInflationContainer(this, disp)) {
AddStateBits(NS_FRAME_FONT_INFLATION_CONTAINER);
if (!GetParent() ||
// I'd use NS_FRAME_OUT_OF_FLOW, but it's not set yet.
disp->IsFloating(this) || disp->IsAbsolutelyPositioned(this) ||
GetParent()->IsFlexContainerFrame() ||
GetParent()->IsGridContainerFrame()) {
AddStateBits(NS_FRAME_FONT_INFLATION_FLOW_ROOT);
}
}
NS_ASSERTION(
GetParent() || HasAnyStateBits(NS_FRAME_FONT_INFLATION_CONTAINER),
"root frame should always be a container");
}
if (TrackingVisibility() && PresShell()->AssumeAllFramesVisible()) {
IncApproximateVisibleCount();
}
DidSetComputedStyle(nullptr);
// For a newly created frame, we need to update this frame's visibility state.
// Usually we update the state when the frame is restyled and has a
// VisibilityChange change hint but we don't generate any change hints for
// newly created frames.
// Note: We don't need to do this for placeholders since placeholders have
// different styles so that the styles don't have visibility:hidden even if
// the parent has visibility:hidden style. We also don't need to update the
// state when creating continuations because its visibility is the same as its
// prev-in-flow, and the animation code cares only primary frames.
if (!IsPlaceholderFrame() && !aPrevInFlow) {
UpdateVisibleDescendantsState();
}
if (!aPrevInFlow && HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
// We aren't going to get a reflow, so nothing else will call
// InvalidateRenderingObservers, we have to do it here.
SVGObserverUtils::InvalidateRenderingObservers(this);
}
}
void nsIFrame::InitPrimaryFrame() {
MOZ_ASSERT(IsPrimaryFrame());
HandlePrimaryFrameStyleChange(nullptr);
}
void nsIFrame::HandlePrimaryFrameStyleChange(ComputedStyle* aOldStyle) {
const nsStyleDisplay* disp = StyleDisplay();
const nsStyleDisplay* oldDisp =
aOldStyle ? aOldStyle->StyleDisplay() : nullptr;
const bool wasQueryContainer = oldDisp && oldDisp->IsQueryContainer();
const bool isQueryContainer = disp->IsQueryContainer();
if (wasQueryContainer != isQueryContainer) {
auto* pc = PresContext();
if (isQueryContainer) {
pc->RegisterContainerQueryFrame(this);
} else {
pc->UnregisterContainerQueryFrame(this);
}
}
const auto cv = disp->ContentVisibility(*this);
if (!oldDisp || oldDisp->ContentVisibility(*this) != cv) {
if (cv == StyleContentVisibility::Auto) {
PresShell()->RegisterContentVisibilityAutoFrame(this);
} else {
if (auto* element = Element::FromNodeOrNull(GetContent())) {
element->ClearContentRelevancy();
}
PresShell()->UnregisterContentVisibilityAutoFrame(this);
}
PresContext()->SetNeedsToUpdateHiddenByContentVisibilityForAnimations();
}
HandleLastRememberedSize();
}
void nsIFrame::Destroy(DestroyContext& aContext) {
NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
"destroy called on frame while scripts not blocked");
NS_ASSERTION(!GetNextSibling() && !GetPrevSibling(),
"Frames should be removed before destruction.");
MOZ_ASSERT(!HasAbsolutelyPositionedChildren());
MOZ_ASSERT(!HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT),
"NS_FRAME_PART_OF_IBSPLIT set on non-nsContainerFrame?");
MaybeScheduleReflowSVGNonDisplayText(this);
SVGObserverUtils::InvalidateDirectRenderingObservers(this);
const auto* disp = StyleDisplay();
if (disp->mPosition == StylePositionProperty::Sticky) {
if (auto* ssc =
StickyScrollContainer::GetStickyScrollContainerForFrame(this)) {
ssc->RemoveFrame(this);
}
}
if (HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
if (nsPlaceholderFrame* placeholder = GetPlaceholderFrame()) {
placeholder->SetOutOfFlowFrame(nullptr);
}
}
nsPresContext* pc = PresContext();
mozilla::PresShell* ps = pc->GetPresShell();
if (IsPrimaryFrame()) {
if (disp->IsQueryContainer()) {
pc->UnregisterContainerQueryFrame(this);
}
if (disp->ContentVisibility(*this) == StyleContentVisibility::Auto) {
ps->UnregisterContentVisibilityAutoFrame(this);
}
// This needs to happen before we clear our Properties() table.
ActiveLayerTracker::TransferActivityToContent(this, mContent);
}
ScrollAnchorContainer* anchor = nullptr;
if (IsScrollAnchor(&anchor)) {
anchor->InvalidateAnchor();
}
if (HasCSSAnimations() || HasCSSTransitions() ||
// It's fine to look up the style frame here since if we're destroying the
// frames for display:table content we should be destroying both wrapper
// and inner frame.
EffectSet::GetForStyleFrame(this)) {
// If no new frame for this element is created by the end of the
// restyling process, stop animations and transitions for this frame
RestyleManager::AnimationsWithDestroyedFrame* adf =
pc->RestyleManager()->GetAnimationsWithDestroyedFrame();
// AnimationsWithDestroyedFrame only lives during the restyling process.
if (adf) {
adf->Put(mContent, mComputedStyle);
}
}
// Disable visibility tracking. Note that we have to do this before we clear
// frame properties and lose track of whether we were previously visible.
// XXX(seth): It'd be ideal to assert that we're already marked nonvisible
// here, but it's unfortunately tricky to guarantee in the face of things like
// frame reconstruction induced by style changes.
DisableVisibilityTracking();
// Ensure that we're not in the approximately visible list anymore.
ps->RemoveFrameFromApproximatelyVisibleList(this);
ps->NotifyDestroyingFrame(this);
if (HasAnyStateBits(NS_FRAME_EXTERNAL_REFERENCE)) {
ps->ClearFrameRefs(this);
}
nsView* view = GetView();
if (view) {
view->SetFrame(nullptr);
view->Destroy();
}
// Make sure that our deleted frame can't be returned from GetPrimaryFrame()
if (IsPrimaryFrame()) {
mContent->SetPrimaryFrame(nullptr);
// Pass the root of a generated content subtree (e.g. ::after/::before) to
// aPostDestroyData to unbind it after frame destruction is done.
if (HasAnyStateBits(NS_FRAME_GENERATED_CONTENT) &&
mContent->IsRootOfNativeAnonymousSubtree()) {
aContext.AddAnonymousContent(mContent.forget());
}
}
// Remove all properties attached to the frame, to ensure any property
// destructors that need the frame pointer are handled properly.
RemoveAllProperties();
// Must retrieve the object ID before calling destructors, so the
// vtable is still valid.
//
// Note to future tweakers: having the method that returns the
// object size call the destructor will not avoid an indirect call;
// the compiler cannot devirtualize the call to the destructor even
// if it's from a method defined in the same class.
nsQueryFrame::FrameIID id = GetFrameId();
this->~nsIFrame();
#ifdef DEBUG
{
nsIFrame* rootFrame = ps->GetRootFrame();
MOZ_ASSERT(rootFrame);
if (this != rootFrame) {
auto* builder = nsLayoutUtils::GetRetainedDisplayListBuilder(rootFrame);
auto* data = builder ? builder->Data() : nullptr;
const bool inData =
data && (data->IsModified(this) || data->HasProps(this));
if (inData) {
DL_LOG(LogLevel::Warning, "Frame %p found in retained data", this);
}
MOZ_ASSERT(!inData, "Deleted frame in retained data!");
}
}
#endif
// Now that we're totally cleaned out, we need to add ourselves to
// the presshell's recycler.
ps->FreeFrame(id, this);
}
std::pair<int32_t, int32_t> nsIFrame::GetOffsets() const {
return std::make_pair(0, 0);
}
static void CompareLayers(
const nsStyleImageLayers* aFirstLayers,
const nsStyleImageLayers* aSecondLayers,
const std::function<void(imgRequestProxy* aReq)>& aCallback) {
NS_FOR_VISIBLE_IMAGE_LAYERS_BACK_TO_FRONT(i, (*aFirstLayers)) {
const auto& image = aFirstLayers->mLayers[i].mImage;
if (!image.IsImageRequestType() || !image.IsResolved()) {
continue;
}
// aCallback is called when the style image in aFirstLayers is thought to
// be different with the corresponded one in aSecondLayers
if (!aSecondLayers || i >= aSecondLayers->mImageCount ||
(!aSecondLayers->mLayers[i].mImage.IsResolved() ||
image.GetImageRequest() !=
aSecondLayers->mLayers[i].mImage.GetImageRequest())) {
if (imgRequestProxy* req = image.GetImageRequest()) {
aCallback(req);
}
}
}
}
static void AddAndRemoveImageAssociations(
ImageLoader& aImageLoader, nsIFrame* aFrame,
const nsStyleImageLayers* aOldLayers,
const nsStyleImageLayers* aNewLayers) {
// If the old context had a background-image image, or mask-image image,
// and new context does not have the same image, clear the image load
// notifier (which keeps the image loading, if it still is) for the frame.
// We want to do this conservatively because some frames paint their
// backgrounds from some other frame's style data, and we don't want
// to clear those notifiers unless we have to. (They'll be reset
// when we paint, although we could miss a notification in that
// interval.)
if (aOldLayers && aFrame->HasImageRequest()) {
CompareLayers(aOldLayers, aNewLayers, [&](imgRequestProxy* aReq) {
aImageLoader.DisassociateRequestFromFrame(aReq, aFrame);
});
}
CompareLayers(aNewLayers, aOldLayers, [&](imgRequestProxy* aReq) {
aImageLoader.AssociateRequestToFrame(aReq, aFrame);
});
}
void nsIFrame::AddDisplayItem(nsDisplayItem* aItem) {
MOZ_DIAGNOSTIC_ASSERT(!mDisplayItems.Contains(aItem));
mDisplayItems.AppendElement(aItem);
#ifdef ACCESSIBILITY
if (nsAccessibilityService* accService = GetAccService()) {
accService->NotifyOfPossibleBoundsChange(PresShell(), mContent);
}
#endif
}
bool nsIFrame::RemoveDisplayItem(nsDisplayItem* aItem) {
return mDisplayItems.RemoveElement(aItem);
}
bool nsIFrame::HasDisplayItems() { return !mDisplayItems.IsEmpty(); }
bool nsIFrame::HasDisplayItem(nsDisplayItem* aItem) {
return mDisplayItems.Contains(aItem);
}
bool nsIFrame::HasDisplayItem(uint32_t aKey) {
for (nsDisplayItem* i : mDisplayItems) {
if (i->GetPerFrameKey() == aKey) {
return true;
}
}
return false;
}
template <typename Condition>
static void DiscardDisplayItems(nsIFrame* aFrame, Condition aCondition) {
for (nsDisplayItem* i : aFrame->DisplayItems()) {
// Only discard items that are invalidated by this frame, as we're only
// guaranteed to rebuild those items. Table background items are created by
// the relevant table part, but have the cell frame as the primary frame,
// and we don't want to remove them if this is the cell.
if (aCondition(i) && i->FrameForInvalidation() == aFrame) {
i->SetCantBeReused();
}
}
}
static void DiscardOldItems(nsIFrame* aFrame) {
DiscardDisplayItems(aFrame,
[](nsDisplayItem* aItem) { return aItem->IsOldItem(); });
}
void nsIFrame::RemoveDisplayItemDataForDeletion() {
// Destroying a WebRenderUserDataTable can cause destruction of other objects
// which can remove frame properties in their destructor. If we delete a frame
// property it runs the destructor of the stored object in the middle of
// updating the frame property table, so if the destruction of that object
// causes another update to the frame property table it would leave the frame
// property table in an inconsistent state. So we remove it from the table and
WebRenderUserDataTable* userDataTable =
TakeProperty(WebRenderUserDataProperty::Key());
if (userDataTable) {
for (const auto& data : userDataTable->Values()) {
data->RemoveFromTable();
}
delete userDataTable;
}
if (!nsLayoutUtils::AreRetainedDisplayListsEnabled()) {
// Retained display lists are disabled, no need to update
// RetainedDisplayListData.
return;
}
auto* builder = nsLayoutUtils::GetRetainedDisplayListBuilder(this);
if (!builder) {
MOZ_ASSERT(DisplayItems().IsEmpty());
MOZ_ASSERT(!IsFrameModified());
return;
}
for (nsDisplayItem* i : DisplayItems()) {
if (i->GetDependentFrame() == this && !i->HasDeletedFrame()) {
i->Frame()->MarkNeedsDisplayItemRebuild();
}
i->RemoveFrame(this);
}
DisplayItems().Clear();
nsAutoString name;
#ifdef DEBUG_FRAME_DUMP
if (DL_LOG_TEST(LogLevel::Debug)) {
GetFrameName(name);
}
#endif
DL_LOGV("Removing display item data for frame %p (%s)", this,
NS_ConvertUTF16toUTF8(name).get());
auto* data = builder->Data();
if (MayHaveWillChangeBudget()) {
// Keep the frame in list, so it can be removed from the will-change budget.
data->Flags(this) = RetainedDisplayListData::FrameFlag::HadWillChange;
} else {
data->Remove(this);
}
}
void nsIFrame::MarkNeedsDisplayItemRebuild() {
if (!nsLayoutUtils::AreRetainedDisplayListsEnabled() || IsFrameModified() ||
HasAnyStateBits(NS_FRAME_IN_POPUP)) {
// Skip frames that are already marked modified.
return;
}
if (Type() == LayoutFrameType::Placeholder) {
nsIFrame* oof = static_cast<nsPlaceholderFrame*>(this)->GetOutOfFlowFrame();
if (oof) {
oof->MarkNeedsDisplayItemRebuild();
}
// Do not mark placeholder frames modified.
return;
}
#ifdef ACCESSIBILITY
if (nsAccessibilityService* accService = GetAccService()) {
accService->NotifyOfPossibleBoundsChange(PresShell(), mContent);
}
#endif
nsIFrame* rootFrame = PresShell()->GetRootFrame();
if (rootFrame->IsFrameModified()) {
// The whole frame tree is modified.
return;
}
auto* builder = nsLayoutUtils::GetRetainedDisplayListBuilder(this);
if (!builder) {
MOZ_ASSERT(DisplayItems().IsEmpty());
return;
}
RetainedDisplayListData* data = builder->Data();
MOZ_ASSERT(data);
if (data->AtModifiedFrameLimit()) {
// This marks the whole frame tree modified.
// See |RetainedDisplayListBuilder::ShouldBuildPartial()|.
data->AddModifiedFrame(rootFrame);
return;
}
nsAutoString name;
#ifdef DEBUG_FRAME_DUMP
if (DL_LOG_TEST(LogLevel::Debug)) {
GetFrameName(name);
}
#endif
DL_LOGV("RDL - Rebuilding display items for frame %p (%s)", this,
NS_ConvertUTF16toUTF8(name).get());
data->AddModifiedFrame(this);
MOZ_ASSERT(
PresContext()->LayoutPhaseCount(nsLayoutPhase::DisplayListBuilding) == 0);
// Hopefully this is cheap, but we could use a frame state bit to note
// the presence of dependencies to speed it up.
for (nsDisplayItem* i : DisplayItems()) {
if (i->HasDeletedFrame() || i->Frame() == this) {
// Ignore the items with deleted frames, and the items with |this| as
// the primary frame.
continue;
}
if (i->GetDependentFrame() == this) {
// For items with |this| as a dependent frame, mark the primary frame
// for rebuild.
i->Frame()->MarkNeedsDisplayItemRebuild();
}
}
}
// Subclass hook for style post processing
/* virtual */
void nsIFrame::DidSetComputedStyle(ComputedStyle* aOldComputedStyle) {
#ifdef ACCESSIBILITY
// Don't notify for reconstructed frames here, since the frame is still being
// constructed at this point and so LocalAccessible::GetFrame() will return
// null. Style changes for reconstructed frames are handled in
// DocAccessible::PruneOrInsertSubtree.
if (aOldComputedStyle) {
if (nsAccessibilityService* accService = GetAccService()) {
accService->NotifyOfComputedStyleChange(PresShell(), mContent);
}
}
#endif
MaybeScheduleReflowSVGNonDisplayText(this);
Document* doc = PresContext()->Document();
ImageLoader* loader = doc->StyleImageLoader();
// Continuing text frame doesn't initialize its continuation pointer before
// reaching here for the first time, so we have to exclude text frames. This
// doesn't affect correctness because text can't match selectors.
//
// FIXME(emilio): We should consider fixing that.
//
// TODO(emilio): Can we avoid doing some / all of the image stuff when
// isNonTextFirstContinuation is false? We should consider doing this just for
// primary frames and pseudos, but the first-line reparenting code makes it
const bool isNonText = !IsTextFrame();
if (isNonText) {
mComputedStyle->StartImageLoads(*doc, aOldComputedStyle);
}
const bool isRootElementStyle = Style()->IsRootElementStyle();
if (isRootElementStyle) {
PresShell()->SyncWindowProperties(/* aSync = */ false);
}
const nsStyleImageLayers* oldLayers =
aOldComputedStyle ? &aOldComputedStyle->StyleBackground()->mImage
: nullptr;
const nsStyleImageLayers* newLayers = &StyleBackground()->mImage;
AddAndRemoveImageAssociations(*loader, this, oldLayers, newLayers);
oldLayers =
aOldComputedStyle ? &aOldComputedStyle->StyleSVGReset()->mMask : nullptr;
newLayers = &StyleSVGReset()->mMask;
AddAndRemoveImageAssociations(*loader, this, oldLayers, newLayers);
const nsStyleDisplay* disp = StyleDisplay();
bool handleStickyChange = false;
if (aOldComputedStyle) {
// Detect style changes that should trigger a scroll anchor adjustment
// suppression.
bool needAnchorSuppression = false;
const nsStyleMargin* oldMargin = aOldComputedStyle->StyleMargin();
if (!oldMargin->MarginEquals(*StyleMargin())) {
needAnchorSuppression = true;
}
const nsStylePadding* oldPadding = aOldComputedStyle->StylePadding();
if (oldPadding->mPadding != StylePadding()->mPadding) {
SetHasPaddingChange(true);
needAnchorSuppression = true;
}
const nsStyleDisplay* oldDisp = aOldComputedStyle->StyleDisplay();
if (oldDisp->mOverflowAnchor != disp->mOverflowAnchor) {
if (auto* container = ScrollAnchorContainer::FindFor(this)) {
container->InvalidateAnchor();
}
if (ScrollContainerFrame* scrollContainerFrame = do_QueryFrame(this)) {
scrollContainerFrame->Anchor()->InvalidateAnchor();
}
}
if (mInScrollAnchorChain) {
const nsStylePosition* pos = StylePosition();
const nsStylePosition* oldPos = aOldComputedStyle->StylePosition();
if (!needAnchorSuppression &&
(!oldPos->InsetEquals(*pos) ||
oldPos->GetWidth() != pos->GetWidth() ||
oldPos->GetMinWidth() != pos->GetMinWidth() ||
oldPos->GetMaxWidth() != pos->GetMaxWidth() ||
oldPos->GetHeight() != pos->GetHeight() ||
oldPos->GetMinHeight() != pos->GetMinHeight() ||
oldPos->GetMaxHeight() != pos->GetMaxHeight() ||
oldDisp->mPosition != disp->mPosition ||
oldDisp->mTransform != disp->mTransform)) {
needAnchorSuppression = true;
}
if (needAnchorSuppression &&
StaticPrefs::layout_css_scroll_anchoring_suppressions_enabled()) {
ScrollAnchorContainer::FindFor(this)->SuppressAdjustments();
}
}
if (disp->mPosition != oldDisp->mPosition) {
if (!disp->IsRelativelyOrStickyPositionedStyle() &&
oldDisp->IsRelativelyOrStickyPositionedStyle()) {
RemoveProperty(NormalPositionProperty());
}
handleStickyChange = disp->mPosition == StylePositionProperty::Sticky ||
oldDisp->mPosition == StylePositionProperty::Sticky;
}
if (disp->mScrollSnapAlign != oldDisp->mScrollSnapAlign) {
ScrollSnapUtils::PostPendingResnapFor(this);
}
if (isRootElementStyle &&
disp->mScrollSnapType != oldDisp->mScrollSnapType) {
if (ScrollContainerFrame* sf =
PresShell()->GetRootScrollContainerFrame()) {
sf->PostPendingResnap();
}
}
if (StyleUIReset()->mMozSubtreeHiddenOnlyVisually &&
!aOldComputedStyle->StyleUIReset()->mMozSubtreeHiddenOnlyVisually) {
PresShell::ClearMouseCapture(this);
}
} else { // !aOldComputedStyle
handleStickyChange = disp->mPosition == StylePositionProperty::Sticky;
}
if (handleStickyChange && !HasAnyStateBits(NS_FRAME_IS_NONDISPLAY) &&
!GetPrevInFlow()) {
// Note that we only add first continuations, but we really only
// want to add first continuation-or-ib-split-siblings. But since we don't
// yet know if we're a later part of a block-in-inline split, we'll just
// add later members of a block-in-inline split here, and then
// StickyScrollContainer will remove them later.
if (auto* ssc =
StickyScrollContainer::GetStickyScrollContainerForFrame(this)) {
if (disp->mPosition == StylePositionProperty::Sticky) {
ssc->AddFrame(this);
} else {
ssc->RemoveFrame(this);
}
}
}
imgIRequest* oldBorderImage =
aOldComputedStyle
? aOldComputedStyle->StyleBorder()->GetBorderImageRequest()
: nullptr;
imgIRequest* newBorderImage = StyleBorder()->GetBorderImageRequest();
// For border-images, we can't be as conservative (we need to set the
// new loaders if there has been any change) since the CalcDifference
// call depended on the result of GetComputedBorder() and that result
// depends on whether the image has loaded, start the image load now
// so that we'll get notified when it completes loading and can do a
// restyle. Otherwise, the image might finish loading from the
// network before we start listening to its notifications, and then
// we'll never know that it's finished loading. Likewise, we want to
// do this for freshly-created frames to prevent a similar race if the
// image loads between reflow (which can depend on whether the image
// is loaded) and paint. We also don't really care about any callers who try
// to paint borders with a different style, because they won't have the
// correct size for the border either.
if (oldBorderImage != newBorderImage) {
// stop and restart the image loading/notification
if (oldBorderImage && HasImageRequest()) {
loader->DisassociateRequestFromFrame(oldBorderImage, this);
}
if (newBorderImage) {
loader->AssociateRequestToFrame(newBorderImage, this);
}
}
auto GetShapeImageRequest = [](const ComputedStyle* aStyle) -> imgIRequest* {
if (!aStyle) {
return nullptr;
}
auto& shape = aStyle->StyleDisplay()->mShapeOutside;
if (!shape.IsImage()) {
return nullptr;
}
return shape.AsImage().GetImageRequest();
};
imgIRequest* oldShapeImage = GetShapeImageRequest(aOldComputedStyle);
imgIRequest* newShapeImage = GetShapeImageRequest(Style());
if (oldShapeImage != newShapeImage) {
if (oldShapeImage && HasImageRequest()) {
loader->DisassociateRequestFromFrame(oldShapeImage, this);
}
if (newShapeImage) {
loader->AssociateRequestToFrame(
newShapeImage, this,
ImageLoader::Flags::
RequiresReflowOnFirstFrameCompleteAndLoadEventBlocking);
}
}
// SVGObserverUtils::GetEffectProperties() asserts that we only invoke it with
// the first continuation so we need to check that in advance.
const bool isNonTextFirstContinuation = isNonText && !GetPrevContinuation();
if (isNonTextFirstContinuation) {
// Kick off loading of external SVG resources referenced from properties if
// any. This currently includes filter, clip-path, and mask.
SVGObserverUtils::InitiateResourceDocLoads(this);
}
// If the page contains markup that overrides text direction, and
// does not contain any characters that would activate the Unicode
// bidi algorithm, we need to call |SetBidiEnabled| on the pres
if (StyleVisibility()->mDirection == StyleDirection::Rtl) {
PresContext()->SetBidiEnabled();
}
// The following part is for caching offset-path:path(). We cache the
// flatten gfx path, so we don't have to rebuild and re-flattern it at
// each cycle if we have animations on offset-* with a fixed offset-path.
const StyleOffsetPath* oldPath =
aOldComputedStyle ? &aOldComputedStyle->StyleDisplay()->mOffsetPath
: nullptr;
const StyleOffsetPath& newPath = StyleDisplay()->mOffsetPath;
if (!oldPath || *oldPath != newPath) {
if (newPath.IsPath()) {
RefPtr<gfx::PathBuilder> builder = MotionPathUtils::GetPathBuilder();
RefPtr<gfx::Path> path =
MotionPathUtils::BuildSVGPath(newPath.AsSVGPathData(), builder);
if (path) {
// The newPath could be path('') (i.e. empty path), so its gfx path
// could be nullptr, and so we only set property for a non-empty path.
SetProperty(nsIFrame::OffsetPathCache(), path.forget().take());
} else {
// May have an old cached path, so we have to delete it.
RemoveProperty(nsIFrame::OffsetPathCache());
}
} else if (oldPath) {
RemoveProperty(nsIFrame::OffsetPathCache());
}
}
if (IsPrimaryFrame()) {
MOZ_ASSERT(aOldComputedStyle);
HandlePrimaryFrameStyleChange(aOldComputedStyle);
}
RemoveStateBits(NS_FRAME_SIMPLE_EVENT_REGIONS | NS_FRAME_SIMPLE_DISPLAYLIST);
mMayHaveRoundedCorners = true;
}
void nsIFrame::HandleLastRememberedSize() {
MOZ_ASSERT(IsPrimaryFrame());
// Storing a last remembered size requires contain-intrinsic-size.
if (!StaticPrefs::layout_css_contain_intrinsic_size_enabled()) {
return;
}
auto* element = Element::FromNodeOrNull(mContent);
if (!element) {
return;
}
const WritingMode wm = GetWritingMode();
const nsStylePosition* stylePos = StylePosition();
bool canRememberBSize = stylePos->ContainIntrinsicBSize(wm).HasAuto();
bool canRememberISize = stylePos->ContainIntrinsicISize(wm).HasAuto();
if (!canRememberBSize) {
element->RemoveLastRememberedBSize();
}
if (!canRememberISize) {
element->RemoveLastRememberedISize();
}
if ((canRememberBSize || canRememberISize) && !HidesContent()) {
bool isNonReplacedInline = IsLineParticipant() && !IsReplaced();
if (!isNonReplacedInline) {
PresContext()->Document()->ObserveForLastRememberedSize(*element);
return;
}
}
PresContext()->Document()->UnobserveForLastRememberedSize(*element);
}
#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
void nsIFrame::AssertNewStyleIsSane(ComputedStyle& aNewStyle) {
MOZ_DIAGNOSTIC_ASSERT(
aNewStyle.GetPseudoType() == mComputedStyle->GetPseudoType() ||
// ::first-line continuations are weird, this should probably be fixed via
(mComputedStyle->GetPseudoType() == PseudoStyleType::firstLine &&
aNewStyle.GetPseudoType() == PseudoStyleType::mozLineFrame) ||
// ::first-letter continuations are broken, in particular floating ones,
// fact, then restyling undoes it...
(mComputedStyle->GetPseudoType() == PseudoStyleType::mozText &&
aNewStyle.GetPseudoType() == PseudoStyleType::firstLetterContinuation) ||
(mComputedStyle->GetPseudoType() ==
PseudoStyleType::firstLetterContinuation &&
aNewStyle.GetPseudoType() == PseudoStyleType::mozText));
}
#endif
void nsIFrame::ReparentFrameViewTo(nsViewManager* aViewManager,
nsView* aNewParentView) {
if (HasView()) {
if (IsMenuPopupFrame()) {
// This view must be parented by the root view, don't reparent it.
return;
}
nsView* view = GetView();
aViewManager->RemoveChild(view);
// The view will remember the Z-order and other attributes that have been
// set on it.
nsView* insertBefore =
nsLayoutUtils::FindSiblingViewFor(aNewParentView, this);
aViewManager->InsertChild(aNewParentView, view, insertBefore,
insertBefore != nullptr);
} else if (HasAnyStateBits(NS_FRAME_HAS_CHILD_WITH_VIEW)) {
for (const auto& childList : ChildLists()) {
// Iterate the child frames, and check each child frame to see if it has
// a view
for (nsIFrame* child : childList.mList) {
child->ReparentFrameViewTo(aViewManager, aNewParentView);
}
}
}
}
void nsIFrame::SyncFrameViewProperties(nsView* aView) {
if (!aView) {
aView = GetView();
if (!aView) {
return;
}
}
nsViewManager* vm = aView->GetViewManager();
// Make sure visibility is correct. This only affects nsSubDocumentFrame.
if (!SupportsVisibilityHidden()) {
// See if the view should be hidden or visible
ComputedStyle* sc = Style();
vm->SetViewVisibility(aView, sc->StyleVisibility()->IsVisible()
? ViewVisibility::Show
: ViewVisibility::Hide);
}
}
/* virtual */
nsMargin nsIFrame::GetUsedMargin() const {
nsMargin margin;
if (((mState & NS_FRAME_FIRST_REFLOW) && !(mState & NS_FRAME_IN_REFLOW)) ||
IsInSVGTextSubtree()) {
return margin;
}
if (nsMargin* m = GetProperty(UsedMarginProperty())) {
margin = *m;
} else if (!StyleMargin()->GetMargin(margin)) {
// If we get here, our caller probably shouldn't be calling us...
NS_ERROR(
"Returning bogus 0-sized margin, because this margin "
"depends on layout & isn't cached!");
}
return margin;
}
/* virtual */
nsMargin nsIFrame::GetUsedBorder() const {
if (((mState & NS_FRAME_FIRST_REFLOW) && !(mState & NS_FRAME_IN_REFLOW)) ||
IsInSVGTextSubtree()) {
return {};
}
const nsStyleDisplay* disp = StyleDisplay();
if (IsThemed(disp)) {
// Theme methods don't use const-ness.
auto* mutable_this = const_cast<nsIFrame*>(this);
nsPresContext* pc = PresContext();
LayoutDeviceIntMargin widgetBorder = pc->Theme()->GetWidgetBorder(
pc->DeviceContext(), mutable_this, disp->EffectiveAppearance());
return LayoutDevicePixel::ToAppUnits(widgetBorder,
pc->AppUnitsPerDevPixel());
}
return StyleBorder()->GetComputedBorder();
}
/* virtual */
nsMargin nsIFrame::GetUsedPadding() const {
nsMargin padding;
if (((mState & NS_FRAME_FIRST_REFLOW) && !(mState & NS_FRAME_IN_REFLOW)) ||
IsInSVGTextSubtree()) {
return padding;
}
const nsStyleDisplay* disp = StyleDisplay();
if (IsThemed(disp)) {
// Theme methods don't use const-ness.
nsIFrame* mutable_this = const_cast<nsIFrame*>(this);
nsPresContext* pc = PresContext();
LayoutDeviceIntMargin widgetPadding;
if (pc->Theme()->GetWidgetPadding(pc->DeviceContext(), mutable_this,
disp->EffectiveAppearance(),
&widgetPadding)) {
return LayoutDevicePixel::ToAppUnits(widgetPadding,
pc->AppUnitsPerDevPixel());
}
}
if (nsMargin* p = GetProperty(UsedPaddingProperty())) {
padding = *p;
} else if (!StylePadding()->GetPadding(padding)) {
// If we get here, our caller probably shouldn't be calling us...
NS_ERROR(
"Returning bogus 0-sized padding, because this padding "
"depends on layout & isn't cached!");
}
return padding;
}
nsIFrame::Sides nsIFrame::GetSkipSides() const {
if (MOZ_UNLIKELY(StyleBorder()->mBoxDecorationBreak ==
StyleBoxDecorationBreak::Clone) &&
!HasAnyStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER)) {
return Sides();
}
// Convert the logical skip sides to physical sides using the frame's
// writing mode
WritingMode writingMode = GetWritingMode();
LogicalSides logicalSkip = GetLogicalSkipSides();
Sides skip;
if (logicalSkip.BStart()) {
if (writingMode.IsVertical()) {
skip |= writingMode.IsVerticalLR() ? SideBits::eLeft : SideBits::eRight;
} else {
skip |= SideBits::eTop;
}
}
if (logicalSkip.BEnd()) {
if (writingMode.IsVertical()) {
skip |= writingMode.IsVerticalLR() ? SideBits::eRight : SideBits::eLeft;
} else {
skip |= SideBits::eBottom;
}
}
if (logicalSkip.IStart()) {
if (writingMode.IsVertical()) {
skip |= SideBits::eTop;
} else {
skip |= writingMode.IsBidiLTR() ? SideBits::eLeft : SideBits::eRight;
}
}
if (logicalSkip.IEnd()) {
if (writingMode.IsVertical()) {
skip |= SideBits::eBottom;
} else {
skip |= writingMode.IsBidiLTR() ? SideBits::eRight : SideBits::eLeft;
}
}
return skip;
}
nsRect nsIFrame::GetPaddingRectRelativeToSelf() const {
nsMargin border = GetUsedBorder().ApplySkipSides(GetSkipSides());
nsRect r(0, 0, mRect.width, mRect.height);
r.Deflate(border);
return r;
}
nsRect nsIFrame::GetPaddingRect() const {
return GetPaddingRectRelativeToSelf() + GetPosition();
}
WritingMode nsIFrame::WritingModeForLine(WritingMode aSelfWM,
nsIFrame* aSubFrame) const {
MOZ_ASSERT(aSelfWM == GetWritingMode());
WritingMode writingMode = aSelfWM;
if (StyleTextReset()->mUnicodeBidi == StyleUnicodeBidi::Plaintext) {
mozilla::intl::BidiEmbeddingLevel frameLevel =
nsBidiPresUtils::GetFrameBaseLevel(aSubFrame);
writingMode.SetDirectionFromBidiLevel(frameLevel);
}
return writingMode;
}
nsRect nsIFrame::GetMarginRect() const {
return GetMarginRectRelativeToSelf() + GetPosition();
}
nsRect nsIFrame::GetMarginRectRelativeToSelf() const {
nsMargin m = GetUsedMargin().ApplySkipSides(GetSkipSides());
nsRect r(0, 0, mRect.width, mRect.height);
r.Inflate(m);
return r;
}
bool nsIFrame::IsTransformed() const {
if (!HasAnyStateBits(NS_FRAME_MAY_BE_TRANSFORMED)) {
MOZ_ASSERT(!IsCSSTransformed());
MOZ_ASSERT(!GetParentSVGTransforms());
return false;
}
return IsCSSTransformed() || GetParentSVGTransforms();
}
bool nsIFrame::IsCSSTransformed() const {
return HasAnyStateBits(NS_FRAME_MAY_BE_TRANSFORMED) &&
(StyleDisplay()->HasTransform(this) || HasAnimationOfTransform());
}
bool nsIFrame::HasAnimationOfTransform() const {
if (!MayHaveTransformAnimation()) {
MOZ_ASSERT(!IsPrimaryFrame() || !SupportsCSSTransforms() ||
!nsLayoutUtils::HasAnimationOfTransformAndMotionPath(this));
return false;
}
return IsPrimaryFrame() && SupportsCSSTransforms() &&
nsLayoutUtils::HasAnimationOfTransformAndMotionPath(this);
}
bool nsIFrame::ChildrenHavePerspective(
const nsStyleDisplay* aStyleDisplay) const {
MOZ_ASSERT(aStyleDisplay == StyleDisplay());
return aStyleDisplay->HasPerspective(this);
}
bool nsIFrame::HasAnimationOfOpacity(EffectSet* aEffectSet) const {
return ((nsLayoutUtils::IsPrimaryStyleFrame(this) ||
nsLayoutUtils::FirstContinuationOrIBSplitSibling(this)
->IsPrimaryFrame()) &&
nsLayoutUtils::HasAnimationOfPropertySet(
this, nsCSSPropertyIDSet::OpacityProperties(), aEffectSet));
}
bool nsIFrame::HasOpacityInternal(float aThreshold,
const nsStyleDisplay* aStyleDisplay,
const nsStyleEffects* aStyleEffects,
EffectSet* aEffectSet) const {
MOZ_ASSERT(0.0 <= aThreshold && aThreshold <= 1.0, "Invalid argument");
if (aStyleEffects->mOpacity < aThreshold ||
aStyleDisplay->mWillChange.bits & StyleWillChangeBits::OPACITY) {
return true;
}
if (!mMayHaveOpacityAnimation) {
return false;
}
return HasAnimationOfOpacity(aEffectSet);
}
bool nsIFrame::DoGetParentSVGTransforms(gfx::Matrix*) const { return false; }
bool nsIFrame::Extend3DContext(const nsStyleDisplay* aStyleDisplay,
const nsStyleEffects* aStyleEffects,
mozilla::EffectSet* aEffectSetForOpacity) const {
if (!HasAnyStateBits(NS_FRAME_MAY_BE_TRANSFORMED)) {
return false;
}
const nsStyleDisplay* disp = StyleDisplayWithOptionalParam(aStyleDisplay);
if (disp->mTransformStyle != StyleTransformStyle::Preserve3d ||
!SupportsCSSTransforms()) {
return false;
}
// If we're all scroll frame, then all descendants will be clipped, so we
// can't preserve 3d.
if (IsScrollContainerFrame()) {
return false;
}
const nsStyleEffects* effects = StyleEffectsWithOptionalParam(aStyleEffects);
if (HasOpacity(disp, effects, aEffectSetForOpacity)) {
return false;
}
return ShouldApplyOverflowClipping(disp).isEmpty() &&
!GetClipPropClipRect(disp, effects, GetSize()) &&
!SVGIntegrationUtils::UsingEffectsForFrame(this) &&
!effects->HasMixBlendMode() &&
disp->mIsolation != StyleIsolation::Isolate;
}
bool nsIFrame::Combines3DTransformWithAncestors() const {
// Check these first as they are faster then both calls below and are we are
// likely to hit the early return (backface hidden is uncommon and
// GetReferenceFrame is a hot caller of this which only calls this if
// IsCSSTransformed is false).
if (!IsCSSTransformed() && !BackfaceIsHidden()) {
return false;
}
nsIFrame* parent = GetClosestFlattenedTreeAncestorPrimaryFrame();
return parent && parent->Extend3DContext();
}
bool nsIFrame::In3DContextAndBackfaceIsHidden() const {
// While both tests fail most of the time, test BackfaceIsHidden()
// first since it's likely to fail faster.
return BackfaceIsHidden() && Combines3DTransformWithAncestors();
}
bool nsIFrame::HasPerspective() const {
if (!IsCSSTransformed()) {
return false;
}
nsIFrame* parent = GetClosestFlattenedTreeAncestorPrimaryFrame();
if (!parent) {
return false;
}
return parent->ChildrenHavePerspective();
}
nsRect nsIFrame::GetContentRectRelativeToSelf() const {
nsMargin bp = GetUsedBorderAndPadding().ApplySkipSides(GetSkipSides());
nsRect r(0, 0, mRect.width, mRect.height);
r.Deflate(bp);
return r;
}
nsRect nsIFrame::GetContentRect() const {
return GetContentRectRelativeToSelf() + GetPosition();
}
bool nsIFrame::ComputeBorderRadii(const BorderRadius& aBorderRadius,
const nsSize& aFrameSize,
const nsSize& aBorderArea, Sides aSkipSides,
nscoord aRadii[8]) {
// Percentages are relative to whichever side they're on.
for (const auto i : mozilla::AllPhysicalHalfCorners()) {
const LengthPercentage& c = aBorderRadius.Get(i);
nscoord axis = HalfCornerIsX(i) ? aFrameSize.width : aFrameSize.height;
aRadii[i] = std::max(0, c.Resolve(axis));
}
if (aSkipSides.Top()) {
aRadii[eCornerTopLeftX] = 0;
aRadii[eCornerTopLeftY] = 0;
aRadii[eCornerTopRightX] = 0;
aRadii[eCornerTopRightY] = 0;
}
if (aSkipSides.Right()) {
aRadii[eCornerTopRightX] = 0;
aRadii[eCornerTopRightY] = 0;
aRadii[eCornerBottomRightX] = 0;
aRadii[eCornerBottomRightY] = 0;
}
if (aSkipSides.Bottom()) {
aRadii[eCornerBottomRightX] = 0;
aRadii[eCornerBottomRightY] = 0;
aRadii[eCornerBottomLeftX] = 0;
aRadii[eCornerBottomLeftY] = 0;
}
if (aSkipSides.Left()) {
aRadii[eCornerBottomLeftX] = 0;
aRadii[eCornerBottomLeftY] = 0;
aRadii[eCornerTopLeftX] = 0;
aRadii[eCornerTopLeftY] = 0;
}
// css3-background specifies this algorithm for reducing
// corner radii when they are too big.
bool haveRadius = false;
double ratio = 1.0f;
for (const auto side : mozilla::AllPhysicalSides()) {
uint32_t hc1 = SideToHalfCorner(side, false, true);
uint32_t hc2 = SideToHalfCorner(side, true, true);
nscoord length =
SideIsVertical(side) ? aBorderArea.height : aBorderArea.width;
nscoord sum = aRadii[hc1] + aRadii[hc2];
if (sum) {
haveRadius = true;
// avoid floating point division in the normal case
if (length < sum) {
ratio = std::min(ratio, double(length) / sum);
}
}
}
if (ratio < 1.0) {
for (const auto corner : mozilla::AllPhysicalHalfCorners()) {
aRadii[corner] *= ratio;
}
}
return haveRadius;
}
void nsIFrame::AdjustBorderRadii(nscoord aRadii[8], const nsMargin& aOffsets) {
auto AdjustOffset = [](const uint32_t aRadius, const nscoord aOffset) {
// Implement the cubic formula to adjust offset when aOffset > 0 and
// aRadius / aOffset < 1.
if (aOffset > 0) {
const double ratio = aRadius / double(aOffset);
if (ratio < 1.0) {
return nscoord(aOffset * (1.0 + std::pow(ratio - 1, 3)));
}
}
return aOffset;
};
for (const auto side : mozilla::AllPhysicalSides()) {
const nscoord offset = aOffsets.Side(side);
const uint32_t hc1 = SideToHalfCorner(side, false, false);
const uint32_t hc2 = SideToHalfCorner(side, true, false);
if (aRadii[hc1] > 0) {
const nscoord offset1 = AdjustOffset(aRadii[hc1], offset);
aRadii[hc1] = std::max(0, aRadii[hc1] + offset1);
}
if (aRadii[hc2] > 0) {
const nscoord offset2 = AdjustOffset(aRadii[hc2], offset);
aRadii[hc2] = std::max(0, aRadii[hc2] + offset2);
}
}
}
static inline bool RadiiAreDefinitelyZero(const BorderRadius& aBorderRadius) {
for (const auto corner : mozilla::AllPhysicalHalfCorners()) {
if (!aBorderRadius.Get(corner).IsDefinitelyZero()) {
return false;
}
}
return true;
}
/* virtual */
bool nsIFrame::GetBorderRadii(const nsSize& aFrameSize,
const nsSize& aBorderArea, Sides aSkipSides,
nscoord aRadii[8]) const {
if (!mMayHaveRoundedCorners) {
memset(aRadii, 0, sizeof(nscoord) * 8);
return false;
}
if (IsThemed()) {
// When we're themed, the native theme code draws the border and
// background, and therefore it doesn't make sense to tell other
// code that's interested in border-radius that we have any radii.
//
// In an ideal world, we might have a way for the them to tell us an
// border radius, but since we don't, we're better off assuming
// zero.
for (const auto corner : mozilla::AllPhysicalHalfCorners()) {
aRadii[corner] = 0;
}
return false;
}
const auto& radii = StyleBorder()->mBorderRadius;
const bool hasRadii =
ComputeBorderRadii(radii, aFrameSize, aBorderArea, aSkipSides, aRadii);
if (!hasRadii) {
// TODO(emilio): Maybe we can just remove this bit and do the
// IsDefinitelyZero check unconditionally. That should still avoid most of
// the work, though maybe not the cache miss of going through the style and
// the border struct.
const_cast<nsIFrame*>(this)->mMayHaveRoundedCorners =
!RadiiAreDefinitelyZero(radii);
}
return hasRadii;
}
bool nsIFrame::GetBorderRadii(nscoord aRadii[8]) const {
nsSize sz = GetSize();
return GetBorderRadii(sz, sz, GetSkipSides(), aRadii);
}
bool nsIFrame::GetMarginBoxBorderRadii(nscoord aRadii[8]) const {
return GetBoxBorderRadii(aRadii, GetUsedMargin());
}
bool nsIFrame::GetPaddingBoxBorderRadii(nscoord aRadii[8]) const {
return GetBoxBorderRadii(aRadii, -GetUsedBorder());
}
bool nsIFrame::GetContentBoxBorderRadii(nscoord aRadii[8]) const {
return GetBoxBorderRadii(aRadii, -GetUsedBorderAndPadding());
}
bool nsIFrame::GetBoxBorderRadii(nscoord aRadii[8],
const nsMargin& aOffsets) const {
if (!GetBorderRadii(aRadii)) {
return false;
}
AdjustBorderRadii(aRadii, aOffsets);
for (const auto corner : mozilla::AllPhysicalHalfCorners()) {
if (aRadii[corner]) {
return true;
}
}
return false;
}
bool nsIFrame::GetShapeBoxBorderRadii(nscoord aRadii[8]) const {
using Tag = StyleShapeOutside::Tag;
auto& shapeOutside = StyleDisplay()->mShapeOutside;
auto box = StyleShapeBox::MarginBox;
switch (shapeOutside.tag) {
case Tag::Image:
case Tag::None:
return false;
case Tag::Box:
box = shapeOutside.AsBox();
break;
case Tag::Shape:
box = shapeOutside.AsShape()._1;
break;
}
switch (box) {
case StyleShapeBox::ContentBox:
return GetContentBoxBorderRadii(aRadii);
case StyleShapeBox::PaddingBox:
return GetPaddingBoxBorderRadii(aRadii);
case StyleShapeBox::BorderBox:
return GetBorderRadii(aRadii);
case StyleShapeBox::MarginBox:
return GetMarginBoxBorderRadii(aRadii);
default:
MOZ_ASSERT_UNREACHABLE("Unexpected box value");
return false;
}
}
nscoord nsIFrame::OneEmInAppUnits() const {
return StyleFont()
->mFont.size.ScaledBy(nsLayoutUtils::FontSizeInflationFor(this))
.ToAppUnits();
}
ComputedStyle* nsIFrame::GetAdditionalComputedStyle(int32_t aIndex) const {
MOZ_ASSERT(aIndex >= 0, "invalid index number");
return nullptr;
}
void nsIFrame::SetAdditionalComputedStyle(int32_t aIndex,
ComputedStyle* aComputedStyle) {
MOZ_ASSERT(aIndex >= 0, "invalid index number");
}
nscoord nsIFrame::SynthesizeFallbackBaseline(
WritingMode aWM, BaselineSharingGroup aBaselineGroup) const {
const auto margin = GetLogicalUsedMargin(aWM);
NS_ASSERTION(!IsSubtreeDirty(), "frame must not be dirty");
if (aWM.IsCentralBaseline()) {
return (BSize(aWM) + GetLogicalUsedMargin(aWM).BEnd(aWM)) / 2;
}
// Baseline for inverted line content is the top (block-start) margin edge,
// as the frame is in effect "flipped" for alignment purposes.
if (aWM.IsLineInverted()) {
const auto marginStart = margin.BStart(aWM);
return aBaselineGroup == BaselineSharingGroup::First
? -marginStart
: BSize(aWM) + marginStart;
}
// Otherwise, the bottom margin edge, per CSS2.1's definition of the
// 'baseline' value of 'vertical-align'.
const auto marginEnd = margin.BEnd(aWM);
return aBaselineGroup == BaselineSharingGroup::First ? BSize(aWM) + marginEnd
: -marginEnd;
}
nscoord nsIFrame::GetLogicalBaseline(WritingMode aWM) const {
return GetLogicalBaseline(aWM, GetDefaultBaselineSharingGroup(),
BaselineExportContext::LineLayout);
}
nscoord nsIFrame::GetLogicalBaseline(
WritingMode aWM, BaselineSharingGroup aBaselineGroup,
BaselineExportContext aExportContext) const {
const auto result =
GetNaturalBaselineBOffset(aWM, aBaselineGroup, aExportContext)
.valueOrFrom([this, aWM, aBaselineGroup]() {
return SynthesizeFallbackBaseline(aWM, aBaselineGroup);
});
if (aBaselineGroup == BaselineSharingGroup::Last) {
return BSize(aWM) - result;
}
return result;
}
const nsFrameList& nsIFrame::GetChildList(ChildListID aListID) const {
if (IsAbsoluteContainer() && aListID == GetAbsoluteListID()) {
return GetAbsoluteContainingBlock()->GetChildList();
} else {
return nsFrameList::EmptyList();
}
}
void nsIFrame::GetChildLists(nsTArray<ChildList>* aLists) const {
if (IsAbsoluteContainer()) {
const nsFrameList& absoluteList =
GetAbsoluteContainingBlock()->GetChildList();
absoluteList.AppendIfNonempty(aLists, GetAbsoluteListID());
}
}
AutoTArray<nsIFrame::ChildList, 4> nsIFrame::CrossDocChildLists() {
AutoTArray<ChildList, 4> childLists;
nsSubDocumentFrame* subdocumentFrame = do_QueryFrame(this);
if (subdocumentFrame) {
// Descend into the subdocument
nsIFrame* root = subdocumentFrame->GetSubdocumentRootFrame();
if (root) {
childLists.EmplaceBack(
nsFrameList(root, nsLayoutUtils::GetLastSibling(root)),
FrameChildListID::Principal);
}
}
GetChildLists(&childLists);
return childLists;
}
nsIFrame::CaretBlockAxisMetrics nsIFrame::GetCaretBlockAxisMetrics(
mozilla::WritingMode aWM, const nsFontMetrics& aFM) const {
// Note(dshin): Ultimately, this does something highly similar (But still
// different) to `nsLayoutUtils::GetFirstLinePosition`.
const auto baseline = GetCaretBaseline();
nscoord ascent = 0, descent = 0;
ascent = aFM.MaxAscent();
descent = aFM.MaxDescent();
const nscoord height = ascent + descent;
if (aWM.IsVertical() && aWM.IsLineInverted()) {
return CaretBlockAxisMetrics{.mOffset = baseline - descent,
.mExtent = height};
}
return CaretBlockAxisMetrics{.mOffset = baseline - ascent, .mExtent = height};
}
nscoord nsIFrame::GetFontMetricsDerivedCaretBaseline(nscoord aBSize) const {
float inflation = nsLayoutUtils::FontSizeInflationFor(this);
RefPtr<nsFontMetrics> fm =
nsLayoutUtils::GetFontMetricsForFrame(this, inflation);
const WritingMode wm = GetWritingMode();
nscoord lineHeight = ReflowInput::CalcLineHeight(
*Style(), PresContext(), GetContent(), aBSize, inflation);
return nsLayoutUtils::GetCenteredFontBaseline(fm, lineHeight,
wm.IsLineInverted()) +
GetLogicalUsedBorderAndPadding(wm).BStart(wm);
}
const nsAtom* nsIFrame::ComputePageValue(const nsAtom* aAutoValue) const {
const nsAtom* value = aAutoValue ? aAutoValue : nsGkAtoms::_empty;
const nsIFrame* frame = this;
// Find what CSS page name value this frame's subtree has, if any.
// Starting with this frame, check if a page name other than auto is present,
// and record it if so. Then, if the current frame is a container frame, find
// the first non-placeholder child and repeat.
// This will find the most deeply nested first in-flow child of this frame's
// subtree, and return its page name (with auto resolved if applicable, and
// subtrees with no page-names returning the empty atom rather than null).
do {
if (const nsAtom* maybePageName = frame->GetStylePageName()) {
value = maybePageName;
}
// Get the next frame to read from.
const nsIFrame* firstNonPlaceholderFrame = nullptr;
// If this is a container frame, inspect its in-flow children.
if (const nsContainerFrame* containerFrame = do_QueryFrame(frame)) {
for (const nsIFrame* childFrame : containerFrame->PrincipalChildList()) {
if (!childFrame->IsPlaceholderFrame()) {
firstNonPlaceholderFrame = childFrame;
break;
}
}
}
frame = firstNonPlaceholderFrame;
} while (frame);
return value;
}
Visibility nsIFrame::GetVisibility() const {
if (!HasAnyStateBits(NS_FRAME_VISIBILITY_IS_TRACKED)) {
return Visibility::Untracked;
}
bool isSet = false;
uint32_t visibleCount = GetProperty(VisibilityStateProperty(), &isSet);
MOZ_ASSERT(isSet,
"Should have a VisibilityStateProperty value "
"if NS_FRAME_VISIBILITY_IS_TRACKED is set");
return visibleCount > 0 ? Visibility::ApproximatelyVisible
: Visibility::ApproximatelyNonVisible;
}
void nsIFrame::UpdateVisibilitySynchronously() {
mozilla::PresShell* presShell = PresShell();
if (!presShell) {
return;
}
if (presShell->AssumeAllFramesVisible()) {
presShell->EnsureFrameInApproximatelyVisibleList(this);
return;
}
bool visible = StyleVisibility()->IsVisible();
nsIFrame* f = GetParent();
nsRect rect = GetRectRelativeToSelf();
nsIFrame* rectFrame = this;
while (f && visible) {
if (ScrollContainerFrame* sf = do_QueryFrame(f)) {
nsRect transformedRect =
nsLayoutUtils::TransformFrameRectToAncestor(rectFrame, rect, f);
if (!sf->IsRectNearlyVisible(transformedRect)) {
visible = false;
break;
}
// In this code we're trying to synchronously update *approximate*
// visibility. (In the future we may update precise visibility here as
// well, which is why the method name does not contain 'approximate'.) The
// IsRectNearlyVisible() check above tells us that the rect we're checking
// is approximately visible within the scrollframe, but we still need to
// ensure that, even if it was scrolled into view, it'd be visible when we
// consider the rest of the document. To do that, we move transformedRect
// to be contained in the scrollport as best we can (it might not fit) to
// pretend that it was scrolled into view.
rect = transformedRect.MoveInsideAndClamp(sf->GetScrollPortRect());
rectFrame = f;
}
nsIFrame* parent = f->GetParent();
if (!parent) {
parent = nsLayoutUtils::GetCrossDocParentFrameInProcess(f);
if (parent && parent->PresContext()->IsChrome()) {
break;
}
}
f = parent;
}
if (visible) {
presShell->EnsureFrameInApproximatelyVisibleList(this);
} else {
presShell->RemoveFrameFromApproximatelyVisibleList(this);
}
}
void nsIFrame::EnableVisibilityTracking() {
if (HasAnyStateBits(NS_FRAME_VISIBILITY_IS_TRACKED)) {
return; // Nothing to do.
}
MOZ_ASSERT(!HasProperty(VisibilityStateProperty()),
"Shouldn't have a VisibilityStateProperty value "
"if NS_FRAME_VISIBILITY_IS_TRACKED is not set");
// Add the state bit so we know to track visibility for this frame, and
// initialize the frame property.
AddStateBits(NS_FRAME_VISIBILITY_IS_TRACKED);
SetProperty(VisibilityStateProperty(), 0);
mozilla::PresShell* presShell = PresShell();
if (!presShell) {
return;
}
// Schedule a visibility update. This method will virtually always be called
// when layout has changed anyway, so it's very unlikely that any additional
// visibility updates will be triggered by this, but this way we guarantee
// that if this frame is currently visible we'll eventually find out.
presShell->ScheduleApproximateFrameVisibilityUpdateSoon();
}
void nsIFrame::DisableVisibilityTracking() {
if (!HasAnyStateBits(NS_FRAME_VISIBILITY_IS_TRACKED)) {
return; // Nothing to do.
}
bool isSet = false;
uint32_t visibleCount = TakeProperty(VisibilityStateProperty(), &isSet);
MOZ_ASSERT(isSet,
"Should have a VisibilityStateProperty value "
"if NS_FRAME_VISIBILITY_IS_TRACKED is set");
RemoveStateBits(NS_FRAME_VISIBILITY_IS_TRACKED);
if (visibleCount == 0) {
return; // We were nonvisible.
}
// We were visible, so send an OnVisibilityChange() notification.
OnVisibilityChange(Visibility::ApproximatelyNonVisible);
}
void nsIFrame::DecApproximateVisibleCount(
const Maybe<OnNonvisible>& aNonvisibleAction
/* = Nothing() */) {
MOZ_ASSERT(HasAnyStateBits(NS_FRAME_VISIBILITY_IS_TRACKED));
bool isSet = false;
uint32_t visibleCount = GetProperty(VisibilityStateProperty(), &isSet);
MOZ_ASSERT(isSet,
"Should have a VisibilityStateProperty value "
"if NS_FRAME_VISIBILITY_IS_TRACKED is set");
MOZ_ASSERT(visibleCount > 0,
"Frame is already nonvisible and we're "
"decrementing its visible count?");
visibleCount--;
SetProperty(VisibilityStateProperty(), visibleCount);
if (visibleCount > 0) {
return;
}
// We just became nonvisible, so send an OnVisibilityChange() notification.
OnVisibilityChange(Visibility::ApproximatelyNonVisible, aNonvisibleAction);
}
void nsIFrame::IncApproximateVisibleCount() {
MOZ_ASSERT(HasAnyStateBits(NS_FRAME_VISIBILITY_IS_TRACKED));
bool isSet = false;
uint32_t visibleCount = GetProperty(VisibilityStateProperty(), &isSet);
MOZ_ASSERT(isSet,
"Should have a VisibilityStateProperty value "
"if NS_FRAME_VISIBILITY_IS_TRACKED is set");
visibleCount++;
SetProperty(VisibilityStateProperty(), visibleCount);
if (visibleCount > 1) {
return;
}
// We just became visible, so send an OnVisibilityChange() notification.
OnVisibilityChange(Visibility::ApproximatelyVisible);
}
void nsIFrame::OnVisibilityChange(Visibility aNewVisibility,
const Maybe<OnNonvisible>& aNonvisibleAction
/* = Nothing() */) {
// images here.
}
static nsIFrame* GetActiveSelectionFrame(nsPresContext* aPresContext,
nsIFrame* aFrame) {
nsIContent* capturingContent = PresShell::GetCapturingContent();
if (capturingContent) {
nsIFrame* activeFrame = aPresContext->GetPrimaryFrameFor(capturingContent);
return activeFrame ? activeFrame : aFrame;
}
return aFrame;
}
int16_t nsIFrame::DetermineDisplaySelection() {
int16_t selType = nsISelectionController::SELECTION_OFF;
nsCOMPtr<nsISelectionController> selCon;
nsresult result =
GetSelectionController(PresContext(), getter_AddRefs(selCon));
if (NS_SUCCEEDED(result) && selCon) {
result = selCon->GetDisplaySelection(&selType);
if (NS_SUCCEEDED(result) &&
(selType != nsISelectionController::SELECTION_OFF)) {
// Check whether style allows selection.
if (!IsSelectable(nullptr)) {
selType = nsISelectionController::SELECTION_OFF;
}
}
}
return selType;
}
static Element* FindElementAncestorForMozSelection(nsIContent* aContent) {
NS_ENSURE_TRUE(aContent, nullptr);
while (aContent && aContent->IsInNativeAnonymousSubtree()) {
aContent = aContent->GetClosestNativeAnonymousSubtreeRootParentOrHost();
}
NS_ASSERTION(aContent, "aContent isn't in non-anonymous tree?");
return aContent ? aContent->GetAsElementOrParentElement() : nullptr;
}
already_AddRefed<ComputedStyle> nsIFrame::ComputeSelectionStyle(
int16_t aSelectionStatus) const {
// Just bail out if not a selection-status that ::selection applies to.
if (aSelectionStatus != nsISelectionController::SELECTION_ON &&
aSelectionStatus != nsISelectionController::SELECTION_DISABLED) {
return nullptr;
}
Element* element = FindElementAncestorForMozSelection(GetContent());
if (!element) {
return nullptr;
}
RefPtr<ComputedStyle> pseudoStyle =
PresContext()->StyleSet()->ProbePseudoElementStyle(
*element, PseudoStyleType::selection, nullptr, Style());
if (!pseudoStyle) {
return nullptr;
}
// When in high-contrast mode, the style system ends up ignoring the color
// declarations, which means that the ::selection style becomes the inherited
// color, and default background. That's no good.
// When force-color-adjust is set to none allow using the color styles,
// as they will not be replaced.
if (PresContext()->ForcingColors() &&
pseudoStyle->StyleText()->mForcedColorAdjust !=
StyleForcedColorAdjust::None) {
return nullptr;
}
return do_AddRef(pseudoStyle);
}
already_AddRefed<ComputedStyle> nsIFrame::ComputeHighlightSelectionStyle(
nsAtom* aHighlightName) {
Element* element = FindElementAncestorForMozSelection(GetContent());
if (!element) {
return nullptr;
}
return PresContext()->StyleSet()->ProbePseudoElementStyle(
*element, PseudoStyleType::highlight, aHighlightName, Style());
}
already_AddRefed<ComputedStyle> nsIFrame::ComputeTargetTextStyle() const {
const Element* element = FindElementAncestorForMozSelection(GetContent());
if (!element) {
return nullptr;
}
RefPtr pseudoStyle = PresContext()->StyleSet()->ProbePseudoElementStyle(
*element, PseudoStyleType::targetText, nullptr, Style());
if (!pseudoStyle) {
return nullptr;
}
if (PresContext()->ForcingColors() &&
pseudoStyle->StyleText()->mForcedColorAdjust !=
StyleForcedColorAdjust::None) {
return nullptr;
}
return pseudoStyle.forget();
}
bool nsIFrame::CanBeDynamicReflowRoot() const {
const auto& display = *StyleDisplay();
if (IsLineParticipant() || display.mDisplay.IsRuby() ||
display.IsInnerTableStyle() ||
display.DisplayInside() == StyleDisplayInside::Table) {
// We have a display type where 'width' and 'height' don't actually set the
// width or height (i.e., the size depends on content).
MOZ_ASSERT(!HasAnyStateBits(NS_FRAME_DYNAMIC_REFLOW_ROOT),
"should not have dynamic reflow root bit");
return false;
}
// In general, frames that have contain:layout+size can be reflow roots.
// (One exception: table-wrapper frames don't work well as reflow roots,
// because their inner-table ReflowInput init path tries to reuse & deref
// the wrapper's containing block's reflow input, which may be null if we
// initiate reflow from the table-wrapper itself.)
//
// Changes to `contain` force frame reconstructions, so we used to use
// NS_FRAME_REFLOW_ROOT, this bit could be set for the whole lifetime of
// this frame. But after the support of `content-visibility: auto` which
// is with contain layout + size when it's not relevant to user, and only
// with contain layout when it is relevant. The frame does not reconstruct
// when the relevancy changes. So we use NS_FRAME_DYNAMIC_REFLOW_ROOT instead.
//
// We place it above the pref check on purpose, to make sure it works for
// containment even with the pref disabled.
if (display.IsContainLayout() && GetContainSizeAxes().IsBoth()) {
return true;
}
if (!StaticPrefs::layout_dynamic_reflow_roots_enabled()) {
return false;
}
// We can't serve as a dynamic reflow root if our used 'width' and 'height'
// might be influenced by content.
//
// FIXME: For display:block, we should probably optimize inline-size: auto.
// FIXME: Other flex and grid cases?
const auto& pos = *StylePosition();
const auto& width = pos.GetWidth();
const auto& height = pos.GetHeight();
if (!width.IsLengthPercentage() || width.HasPercent() ||
!height.IsLengthPercentage() || height.HasPercent() ||
IsIntrinsicKeyword(pos.GetMinWidth()) ||
IsIntrinsicKeyword(pos.GetMaxWidth()) ||
IsIntrinsicKeyword(pos.GetMinHeight()) ||
IsIntrinsicKeyword(pos.GetMaxHeight()) ||
((pos.GetMinWidth().IsAuto() || pos.GetMinHeight().IsAuto()) &&
IsFlexOrGridItem())) {
return false;
}
// If our flex-basis is 'auto', it'll defer to 'width' (or 'height') which
// we've already checked. Otherwise, it preempts them, so we need to
// perform the same "could-this-value-be-influenced-by-content" checks that
// we performed for 'width' and 'height' above.
if (IsFlexItem()) {
const auto& flexBasis = pos.mFlexBasis;
if (!flexBasis.IsAuto()) {
if (!flexBasis.IsSize() || !flexBasis.AsSize().IsLengthPercentage() ||
flexBasis.AsSize().HasPercent()) {
return false;
}
}
}
if (!IsFixedPosContainingBlock()) {
// We can't treat this frame as a reflow root, since dynamic changes
// to absolutely-positioned frames inside of it require that we
// reflow the placeholder before we reflow the absolutely positioned
// frame.
// FIXME: Alternatively, we could sort the reflow roots in
// PresShell::ProcessReflowCommands by depth in the tree, from
// deepest to least deep. However, for performance (FIXME) we
// should really be sorting them in the opposite order!
return false;
}
// If we participate in a container's block reflow context, or margins
// can collapse through us, we can't be a dynamic reflow root.
// (NS_BLOCK_BFC is block specific bit, check first as an optimization, it's
// okay because we also check that it is a block frame.)
if (!HasAnyStateBits(NS_BLOCK_BFC) && IsBlockFrameOrSubclass()) {
return false;
}
// Subgrids are never reflow roots, but 'contain:layout/paint' prevents
// creating a subgrid in the first place.
if (pos.mGridTemplateColumns.IsSubgrid() ||
pos.mGridTemplateRows.IsSubgrid()) {
// NOTE: we could check that 'display' of our parent's primary frame is
// '[inline-]grid' here but that's probably not worth it in practice.
if (!display.IsContainLayout() && !display.IsContainPaint()) {
return false;
}
}
// If we are split, we can't be a dynamic reflow root. Our reflow status may
// change after reflow, and our parent is responsible to create or delete our
// next-in-flow.
if (GetPrevContinuation() || GetNextContinuation()) {
return false;
}
return true;
}
/********************************************************
* Refreshes each content's frame
*********************************************************/
void nsIFrame::DisplayOutlineUnconditional(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
// "All css properties of table-column and table-column-group boxes are
// ignored, except when explicitly specified by this specification."
// CSS outlines fall into this category, so we skip them on these boxes.
MOZ_ASSERT(!IsTableColGroupFrame() && !IsTableColFrame());
const auto& outline = *StyleOutline();
if (!outline.ShouldPaintOutline()) {
return;
}
// Outlines are painted by the table wrapper frame.
if (IsTableFrame()) {
return;
}
if (HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT) &&
ScrollableOverflowRect().IsEmpty()) {
// We may still want to fix some of the overflow area calculations over in
// that bug.
return;
}
// We don't display outline-style: auto on themed frames that have their own
// focus indicators.
if (outline.mOutlineStyle.IsAuto()) {
auto* disp = StyleDisplay();
if (IsThemed(disp) && PresContext()->Theme()->ThemeDrawsFocusForWidget(
this, disp->EffectiveAppearance())) {
return;
}
}
aLists.Outlines()->AppendNewToTop<nsDisplayOutline>(aBuilder, this);
}
void nsIFrame::DisplayOutline(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
if (!IsVisibleForPainting()) {
return;
}
DisplayOutlineUnconditional(aBuilder, aLists);
}
void nsIFrame::DisplayInsetBoxShadowUnconditional(
nsDisplayListBuilder* aBuilder, nsDisplayList* aList) {
// XXXbz should box-shadow for rows/rowgroups/columns/colgroups get painted
// just because we're visible? Or should it depend on the cell visibility
// when we're not the whole table?
const auto* effects = StyleEffects();
if (effects->HasBoxShadowWithInset(true)) {
aList->AppendNewToTop<nsDisplayBoxShadowInner>(aBuilder, this);
}
}
void nsIFrame::DisplayInsetBoxShadow(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList) {
if (!IsVisibleForPainting()) {
return;
}
DisplayInsetBoxShadowUnconditional(aBuilder, aList);
}
void nsIFrame::DisplayOutsetBoxShadowUnconditional(
nsDisplayListBuilder* aBuilder, nsDisplayList* aList) {
// XXXbz should box-shadow for rows/rowgroups/columns/colgroups get painted
// just because we're visible? Or should it depend on the cell visibility
// when we're not the whole table?
const auto* effects = StyleEffects();
if (effects->HasBoxShadowWithInset(false)) {
aList->AppendNewToTop<nsDisplayBoxShadowOuter>(aBuilder, this);
}
}
void nsIFrame::DisplayOutsetBoxShadow(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList) {
if (!IsVisibleForPainting()) {
return;
}
DisplayOutsetBoxShadowUnconditional(aBuilder, aList);
}
void nsIFrame::DisplayCaret(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList) {
if (!IsVisibleForPainting()) {
return;
}
aList->AppendNewToTop<nsDisplayCaret>(aBuilder, this);
}
nscolor nsIFrame::GetCaretColorAt(int32_t aOffset) {
return nsLayoutUtils::GetTextColor(this, &nsStyleUI::mCaretColor);
}
auto nsIFrame::ComputeShouldPaintBackground() const -> ShouldPaintBackground {
nsPresContext* pc = PresContext();
ShouldPaintBackground settings{pc->GetBackgroundColorDraw(),
pc->GetBackgroundImageDraw()};
if (settings.mColor && settings.mImage) {
return settings;
}
if (StyleVisibility()->mPrintColorAdjust == StylePrintColorAdjust::Exact) {
return {true, true};
}
return settings;
}
bool nsIFrame::DisplayBackgroundUnconditional(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
if (aBuilder->IsForEventDelivery() && !aBuilder->HitTestIsForVisibility()) {
// For hit-testing, we generally just need a light-weight data structure
// like nsDisplayEventReceiver. But if the hit-testing is for visibility,
// then we need to know the opaque region in order to determine whether to
// stop or not.
aLists.BorderBackground()->AppendNewToTop<nsDisplayEventReceiver>(aBuilder,
this);
return false;
}
const AppendedBackgroundType result =
nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
aBuilder, this,
GetRectRelativeToSelf() + aBuilder->ToReferenceFrame(this),
aLists.BorderBackground());
if (result == AppendedBackgroundType::None) {
aBuilder->BuildCompositorHitTestInfoIfNeeded(this,
aLists.BorderBackground());
}
return result == AppendedBackgroundType::ThemedBackground;
}
void nsIFrame::DisplayBorderBackgroundOutline(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
// The visibility check belongs here since child elements have the
// opportunity to override the visibility property and display even if
// their parent is hidden.
if (!IsVisibleForPainting()) {
return;
}
DisplayOutsetBoxShadowUnconditional(aBuilder, aLists.BorderBackground());
bool bgIsThemed = DisplayBackgroundUnconditional(aBuilder, aLists);
DisplayInsetBoxShadowUnconditional(aBuilder, aLists.BorderBackground());
// If there's a themed background, we should not create a border item.
// It won't be rendered.
// Don't paint borders for tables here, since they paint them in a different
// order.
if (!bgIsThemed && StyleBorder()->HasBorder() && !IsTableFrame()) {
aLists.BorderBackground()->AppendNewToTop<nsDisplayBorder>(aBuilder, this);
}
DisplayOutlineUnconditional(aBuilder, aLists);
}
inline static bool IsSVGContentWithCSSClip(const nsIFrame* aFrame) {
// The CSS spec says that the 'clip' property only applies to absolutely
// positioned elements, whereas the SVG spec says that it applies to SVG
// elements regardless of the value of the 'position' property. Here we obey
// the CSS spec for outer-<svg> (since that's what we generally do), but
// obey the SVG spec for other SVG elements to which 'clip' applies.
return aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT) &&
aFrame->GetContent()->IsAnyOfSVGElements(nsGkAtoms::svg,
nsGkAtoms::foreignObject);
}
Maybe<nsRect> nsIFrame::GetClipPropClipRect(const nsStyleDisplay* aDisp,
const nsStyleEffects* aEffects,
const nsSize& aSize) const {
if (aEffects->mClip.IsAuto() ||
!(aDisp->IsAbsolutelyPositioned(this) || IsSVGContentWithCSSClip(this))) {
return Nothing();
}
auto& clipRect = aEffects->mClip.AsRect();
nsRect rect = clipRect.ToLayoutRect();
if (MOZ_LIKELY(StyleBorder()->mBoxDecorationBreak ==
StyleBoxDecorationBreak::Slice)) {
// The clip applies to the joined boxes so it's relative the first
// continuation.
nscoord y = 0;
for (nsIFrame* f = GetPrevContinuation(); f; f = f->GetPrevContinuation()) {
y += f->GetRect().height;
}
rect.MoveBy(nsPoint(0, -y));
}
if (clipRect.right.IsAuto()) {
rect.width = aSize.width - rect.x;
}
if (clipRect.bottom.IsAuto()) {
rect.height = aSize.height - rect.y;
}
return Some(rect);
}
/**
* If the CSS 'overflow' property applies to this frame, and is not
* handled by constructing a dedicated nsHTML/XULScrollFrame, set up clipping
* for that overflow in aBuilder->ClipState() to clip all containing-block
* descendants.
*/
static void ApplyOverflowClipping(
nsDisplayListBuilder* aBuilder, const nsIFrame* aFrame,
PhysicalAxes aClipAxes,
DisplayListClipState::AutoClipMultiple& aClipState) {
// Only 'clip' is handled here (and 'hidden' for table frames, and any
// non-'visible' value for blocks in a paginated context).
// We allow 'clip' to apply to any kind of frame. This is required by
// comboboxes which make their display text (an inline frame) have clipping.
MOZ_ASSERT(!aClipAxes.isEmpty());
MOZ_ASSERT(aFrame->ShouldApplyOverflowClipping(aFrame->StyleDisplay()) ==
aClipAxes);
nsRect clipRect;
bool haveRadii = false;
nscoord radii[8];
auto* disp = aFrame->StyleDisplay();
// Only deflate the padding if we clip to the content-box in that axis.
auto wm = aFrame->GetWritingMode();
bool cbH = (wm.IsVertical() ? disp->mOverflowClipBoxBlock
: disp->mOverflowClipBoxInline) ==
StyleOverflowClipBox::ContentBox;
bool cbV = (wm.IsVertical() ? disp->mOverflowClipBoxInline
: disp->mOverflowClipBoxBlock) ==
StyleOverflowClipBox::ContentBox;
nsMargin boxMargin = -aFrame->GetUsedPadding();
if (!cbH) {
boxMargin.left = boxMargin.right = nscoord(0);
}
if (!cbV) {
boxMargin.top = boxMargin.bottom = nscoord(0);
}
auto clipMargin = aFrame->OverflowClipMargin(aClipAxes);
boxMargin -= aFrame->GetUsedBorder();
boxMargin += nsMargin(clipMargin.height, clipMargin.width, clipMargin.height,
clipMargin.width);
boxMargin.ApplySkipSides(aFrame->GetSkipSides());
nsRect rect(nsPoint(0, 0), aFrame->GetSize());
rect.Inflate(boxMargin);
if (MOZ_UNLIKELY(!aClipAxes.contains(PhysicalAxis::Horizontal))) {
// NOTE(mats) We shouldn't be clipping at all in this dimension really,
// but clipping in just one axis isn't supported by our GFX APIs so we
// clip to our visual overflow rect instead.
nsRect o = aFrame->InkOverflowRect();
rect.x = o.x;
rect.width = o.width;
}
if (MOZ_UNLIKELY(!aClipAxes.contains(PhysicalAxis::Vertical))) {
// See the note above.
nsRect o = aFrame->InkOverflowRect();
rect.y = o.y;
rect.height = o.height;
}
clipRect = rect + aBuilder->ToReferenceFrame(aFrame);
haveRadii = aFrame->GetBoxBorderRadii(radii, boxMargin);
aClipState.ClipContainingBlockDescendantsExtra(clipRect,
haveRadii ? radii : nullptr);
}
nsSize nsIFrame::OverflowClipMargin(PhysicalAxes aClipAxes) const {
nsSize result;
if (aClipAxes.isEmpty()) {
return result;
}
const auto& margin = StyleMargin()->mOverflowClipMargin;
if (margin.IsZero()) {
return result;
}
nscoord marginAu = margin.ToAppUnits();
if (aClipAxes.contains(PhysicalAxis::Horizontal)) {
result.width = marginAu;
}
if (aClipAxes.contains(PhysicalAxis::Vertical)) {
result.height = marginAu;
}
return result;
}
/**
* Returns whether a display item that gets created with the builder's current
* state will have a scrolled clip, i.e. a clip that is scrolled by a scroll
* frame which does not move the item itself.
*/
static bool BuilderHasScrolledClip(nsDisplayListBuilder* aBuilder) {
const DisplayItemClipChain* currentClip =
aBuilder->ClipState().GetCurrentCombinedClipChain(aBuilder);
if (!currentClip) {
return false;
}
const ActiveScrolledRoot* currentClipASR = currentClip->mASR;
const ActiveScrolledRoot* currentASR = aBuilder->CurrentActiveScrolledRoot();
return ActiveScrolledRoot::PickDescendant(currentClipASR, currentASR) !=
currentASR;
}
class AutoSaveRestoreContainsBlendMode {
nsDisplayListBuilder& mBuilder;
bool mSavedContainsBlendMode;
public:
explicit AutoSaveRestoreContainsBlendMode(nsDisplayListBuilder& aBuilder)
: mBuilder(aBuilder),
mSavedContainsBlendMode(aBuilder.ContainsBlendMode()) {}
~AutoSaveRestoreContainsBlendMode() {
mBuilder.SetContainsBlendMode(mSavedContainsBlendMode);
}
};
static bool IsFrameOrAncestorApzAware(nsIFrame* aFrame) {
nsIContent* node = aFrame->GetContent();
if (!node) {
return false;
}
do {
if (node->IsNodeApzAware()) {
return true;
}
nsIContent* shadowRoot = node->GetShadowRoot();
if (shadowRoot && shadowRoot->IsNodeApzAware()) {
return true;
}
// Even if the node owning aFrame doesn't have apz-aware event listeners
// itself, its shadow root or display: contents ancestors (which have no
// frames) might, so we need to account for them too.
} while ((node = node->GetFlattenedTreeParent()) && node->IsElement() &&
node->AsElement()->IsDisplayContents());
return false;
}
static void CheckForApzAwareEventHandlers(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame) {
if (aBuilder->GetAncestorHasApzAwareEventHandler()) {
return;
}
if (IsFrameOrAncestorApzAware(aFrame)) {
aBuilder->SetAncestorHasApzAwareEventHandler(true);
}
}
static void UpdateCurrentHitTestInfo(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame) {
if (!aBuilder->BuildCompositorHitTestInfo()) {
// Compositor hit test info is not used.
return;
}
CheckForApzAwareEventHandlers(aBuilder, aFrame);
const CompositorHitTestInfo info = aFrame->GetCompositorHitTestInfo(aBuilder);
aBuilder->SetCompositorHitTestInfo(info);
}
/**
* True if aDescendant participates the context aAncestor participating.
*/
static bool FrameParticipatesIn3DContext(nsIFrame* aAncestor,
nsIFrame* aDescendant) {
MOZ_ASSERT(aAncestor != aDescendant);
MOZ_ASSERT(aAncestor->GetContent() != aDescendant->GetContent());
MOZ_ASSERT(aAncestor->Extend3DContext());
nsIFrame* ancestor = aAncestor->FirstContinuation();
MOZ_ASSERT(ancestor->IsPrimaryFrame());
nsIFrame* frame;
for (frame = aDescendant->GetClosestFlattenedTreeAncestorPrimaryFrame();
frame && ancestor != frame;
frame = frame->GetClosestFlattenedTreeAncestorPrimaryFrame()) {
if (!frame->Extend3DContext()) {
return false;
}
}
MOZ_ASSERT(frame == ancestor);
return true;
}
static bool ItemParticipatesIn3DContext(nsIFrame* aAncestor,
nsDisplayItem* aItem) {
auto type = aItem->GetType();
const bool isContainer = type == DisplayItemType::TYPE_WRAP_LIST ||
type == DisplayItemType::TYPE_CONTAINER;
if (isContainer && aItem->GetChildren()->Length() == 1) {
// If the wraplist has only one child item, use the type of that item.
type = aItem->GetChildren()->GetBottom()->GetType();
}
if (type != DisplayItemType::TYPE_TRANSFORM &&
type != DisplayItemType::TYPE_PERSPECTIVE) {
return false;
}
nsIFrame* transformFrame = aItem->Frame();
if (aAncestor->GetContent() == transformFrame->GetContent()) {
return true;
}
return FrameParticipatesIn3DContext(aAncestor, transformFrame);
}
static void WrapSeparatorTransform(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame,
nsDisplayList* aNonParticipants,
nsDisplayList* aParticipants, int aIndex,
nsDisplayItem** aSeparator) {
if (aNonParticipants->IsEmpty()) {
return;
}
nsDisplayTransform* item = MakeDisplayItemWithIndex<nsDisplayTransform>(
aBuilder, aFrame, aIndex, aNonParticipants, aBuilder->GetVisibleRect());
if (*aSeparator == nullptr && item) {
*aSeparator = item;
}
aParticipants->AppendToTop(item);
}
// Try to compute a clip rect to bound the contents of the mask item
// that will be built for |aMaskedFrame|. If we're not able to compute
// one, return an empty Maybe.
// The returned clip rect, if there is one, is relative to |aMaskedFrame|.
static Maybe<nsRect> ComputeClipForMaskItem(
nsDisplayListBuilder* aBuilder, nsIFrame* aMaskedFrame,
const SVGUtils::MaskUsage& aMaskUsage) {
const nsStyleSVGReset* svgReset = aMaskedFrame->StyleSVGReset();
nsPoint offsetToUserSpace =
nsLayoutUtils::ComputeOffsetToUserSpace(aBuilder, aMaskedFrame);
int32_t devPixelRatio = aMaskedFrame->PresContext()->AppUnitsPerDevPixel();
gfxPoint devPixelOffsetToUserSpace =
nsLayoutUtils::PointToGfxPoint(offsetToUserSpace, devPixelRatio);
CSSToLayoutDeviceScale cssToDevScale =
aMaskedFrame->PresContext()->CSSToDevPixelScale();
nsPoint toReferenceFrame;
aBuilder->FindReferenceFrameFor(aMaskedFrame, &toReferenceFrame);
Maybe<gfxRect> combinedClip;
if (aMaskUsage.ShouldApplyBasicShapeOrPath()) {
Maybe<Rect> result =
CSSClipPathInstance::GetBoundingRectForBasicShapeOrPathClip(
aMaskedFrame, svgReset->mClipPath);
if (result) {
combinedClip = Some(ThebesRect(*result));
}
} else if (aMaskUsage.ShouldApplyClipPath()) {
gfxRect result = SVGUtils::GetBBox(
aMaskedFrame,
SVGUtils::eBBoxIncludeClipped | SVGUtils::eBBoxIncludeFill |
SVGUtils::eBBoxIncludeMarkers | SVGUtils::eBBoxIncludeStroke |
SVGUtils::eDoNotClipToBBoxOfContentInsideClipPath);
combinedClip = Some(
ThebesRect((CSSRect::FromUnknownRect(ToRect(result)) * cssToDevScale)
.ToUnknownRect()));
} else {
// The code for this case is adapted from ComputeMaskGeometry().
nsRect borderArea(toReferenceFrame, aMaskedFrame->GetSize());
borderArea -= offsetToUserSpace;
// Use an infinite dirty rect to pass into nsCSSRendering::
// GetImageLayerClip() because we don't have an actual dirty rect to
// pass in. This is fine because the only time GetImageLayerClip() will
// not intersect the incoming dirty rect with something is in the "NoClip"
// case, and we handle that specially.
nsRect dirtyRect(nscoord_MIN / 2, nscoord_MIN / 2, nscoord_MAX,
nscoord_MAX);
nsIFrame* firstFrame =
nsLayoutUtils::FirstContinuationOrIBSplitSibling(aMaskedFrame);
nsTArray<SVGMaskFrame*> maskFrames;
// XXX check return value?
SVGObserverUtils::GetAndObserveMasks(firstFrame, &maskFrames);
for (uint32_t i = 0; i < maskFrames.Length(); ++i) {
gfxRect clipArea;
if (maskFrames[i]) {
clipArea = maskFrames[i]->GetMaskArea(aMaskedFrame);
clipArea = ThebesRect(
(CSSRect::FromUnknownRect(ToRect(clipArea)) * cssToDevScale)
.ToUnknownRect());
} else {
const auto& layer = svgReset->mMask.mLayers[i];
if (layer.mClip == StyleGeometryBox::NoClip) {
return Nothing();
}
nsCSSRendering::ImageLayerClipState clipState;
nsCSSRendering::GetImageLayerClip(
layer, aMaskedFrame, *aMaskedFrame->StyleBorder(), borderArea,
dirtyRect, false /* aWillPaintBorder */, devPixelRatio, &clipState);
clipArea = clipState.mDirtyRectInDevPx;
}
combinedClip = UnionMaybeRects(combinedClip, Some(clipArea));
}
}
if (combinedClip) {
// Convert to user space.
*combinedClip += devPixelOffsetToUserSpace;
// Round the clip out. In FrameLayerBuilder we round clips to nearest
// pixels, and if we have a really thin clip here, that can cause the
// clip to become empty if we didn't round out here.
// The rounding happens in coordinates that are relative to the reference
// frame, which matches what FrameLayerBuilder does.
combinedClip->RoundOut();
// Convert to app units.
nsRect result =
nsLayoutUtils::RoundGfxRectToAppRect(*combinedClip, devPixelRatio);
// The resulting clip is relative to the reference frame, but the caller
// expects it to be relative to the masked frame, so adjust it.
result -= toReferenceFrame;
return Some(result);
}
return Nothing();
}
struct AutoCheckBuilder {
explicit AutoCheckBuilder(nsDisplayListBuilder* aBuilder)
: mBuilder(aBuilder) {
aBuilder->Check();
}
~AutoCheckBuilder() { mBuilder->Check(); }
nsDisplayListBuilder* mBuilder;
};
/**
* Tries to reuse a top-level stacking context item from the previous paint.
* Returns true if an item was reused, otherwise false.
*/
bool TryToReuseStackingContextItem(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList, nsIFrame* aFrame) {
if (!aBuilder->IsForPainting() || !aBuilder->IsPartialUpdate() ||
aBuilder->InInvalidSubtree()) {
return false;
}
if (aFrame->IsFrameModified() || aFrame->HasModifiedDescendants()) {
return false;
}
auto& items = aFrame->DisplayItems();
auto* res = std::find_if(
items.begin(), items.end(),
[](nsDisplayItem* aItem) { return aItem->IsPreProcessed(); });
if (res == items.end()) {
return false;
}
nsDisplayItem* container = *res;
MOZ_ASSERT(container->Frame() == aFrame);
DL_LOGD("RDL - Found SC item %p (%s) (frame: %p)", container,
container->Name(), container->Frame());
aList->AppendToTop(container);
aBuilder->ReuseDisplayItem(container);
return true;
}
void nsIFrame::BuildDisplayListForStackingContext(
nsDisplayListBuilder* aBuilder, nsDisplayList* aList,
bool* aCreatedContainerItem) {
#ifdef DEBUG
DL_LOGV("BuildDisplayListForStackingContext (%p) <", this);
ScopeExit e(
[this]() { DL_LOGV("> BuildDisplayListForStackingContext (%p)", this); });
#endif
AutoCheckBuilder check(aBuilder);
if (aBuilder->IsReusingStackingContextItems() &&
TryToReuseStackingContextItem(aBuilder, aList, this)) {
if (aCreatedContainerItem) {
*aCreatedContainerItem = true;
}
return;
}
if (HasAnyStateBits(NS_FRAME_TOO_DEEP_IN_FRAME_TREE)) {
return;
}
const auto& style = *Style();
const nsStyleDisplay* disp = style.StyleDisplay();
const nsStyleEffects* effects = style.StyleEffects();
EffectSet* effectSetForOpacity =
EffectSet::GetForFrame(this, nsCSSPropertyIDSet::OpacityProperties());
// We can stop right away if this is a zero-opacity stacking context and
// we're painting, and we're not animating opacity.
bool needHitTestInfo = aBuilder->BuildCompositorHitTestInfo() &&
Style()->PointerEvents() != StylePointerEvents::None;
bool opacityItemForEventsOnly = false;
if (effects->IsTransparent() && aBuilder->IsForPainting() &&
!(disp->mWillChange.bits & StyleWillChangeBits::OPACITY) &&
!nsLayoutUtils::HasAnimationOfPropertySet(
this, nsCSSPropertyIDSet::OpacityProperties(), effectSetForOpacity)) {
if (needHitTestInfo) {
opacityItemForEventsOnly = true;
} else {
return;
}
}
if (aBuilder->IsForPainting() && disp->mWillChange.bits) {
aBuilder->AddToWillChangeBudget(this, GetSize());
}
// For preserves3d, use the dirty rect already installed on the
// builder, since aDirtyRect maybe distorted for transforms along
// the chain.
nsRect visibleRect = aBuilder->GetVisibleRect();
nsRect dirtyRect = aBuilder->GetDirtyRect();
// We build an opacity item if it's not going to be drawn by SVG content.
// We could in principle skip creating an nsDisplayOpacity item if
// nsDisplayOpacity::NeedsActiveLayer returns false and usingSVGEffects is
// true (the nsDisplayFilter/nsDisplayMasksAndClipPaths could handle the
// opacity). Since SVG has perf issues where we sometimes spend a lot of
// time creating display list items that might be helpful. We'd need to
// need to invalidate the frame if the value that would be return from
// NeedsActiveLayer was to change, which we don't currently do.
const bool useOpacity =
HasVisualOpacity(disp, effects, effectSetForOpacity) &&
!SVGUtils::CanOptimizeOpacity(this);
const bool isTransformed = IsTransformed();
const bool hasPerspective = isTransformed && HasPerspective();
const bool extend3DContext =
Extend3DContext(disp, effects, effectSetForOpacity);
const bool combines3DTransformWithAncestors =
(extend3DContext || isTransformed) && Combines3DTransformWithAncestors();
Maybe<nsDisplayListBuilder::AutoPreserves3DContext> autoPreserves3DContext;
if (extend3DContext && !combines3DTransformWithAncestors) {
// Start a new preserves3d context to keep informations on
// nsDisplayListBuilder.
autoPreserves3DContext.emplace(aBuilder);
// Save dirty rect on the builder to avoid being distorted for
// multiple transforms along the chain.
aBuilder->SavePreserves3DRect();
// We rebuild everything within preserve-3d and don't try
// to retain, so override the dirty rect now.
if (aBuilder->IsRetainingDisplayList()) {
dirtyRect = visibleRect;
aBuilder->SetDisablePartialUpdates(true);
}
}
const bool useBlendMode = effects->mMixBlendMode != StyleBlend::Normal;
if (useBlendMode) {
aBuilder->SetContainsBlendMode(true);
}
// reset blend mode so we can keep track if this stacking context needs have
// a nsDisplayBlendContainer. Set the blend mode back when the routine exits
// so we keep track if the parent stacking context needs a container too.
AutoSaveRestoreContainsBlendMode autoRestoreBlendMode(*aBuilder);
aBuilder->SetContainsBlendMode(false);
// NOTE: When changing this condition make sure to tweak ScrollContainerFrame
// as well.
bool usingBackdropFilter = effects->HasBackdropFilters() &&
IsVisibleForPainting() &&
!style.IsRootElementStyle();
nsRect visibleRectOutsideTransform = visibleRect;
nsDisplayTransform::PrerenderInfo prerenderInfo;
bool inTransform = aBuilder->IsInTransform();
if (isTransformed) {
prerenderInfo = nsDisplayTransform::ShouldPrerenderTransformedContent(
aBuilder, this, &visibleRect);
switch (prerenderInfo.mDecision) {
case nsDisplayTransform::PrerenderDecision::Full:
case nsDisplayTransform::PrerenderDecision::Partial:
dirtyRect = visibleRect;
break;
case nsDisplayTransform::PrerenderDecision::No: {
// If we didn't prerender an animated frame in a preserve-3d context,
// then we want disable async animations for the rest of the preserve-3d
// (especially ancestors).
if ((extend3DContext || combines3DTransformWithAncestors) &&
prerenderInfo.mHasAnimations) {
aBuilder->SavePreserves3DAllowAsyncAnimation(false);
}
const nsRect overflow = InkOverflowRectRelativeToSelf();
if (overflow.IsEmpty() && !extend3DContext) {
return;
}
// If we're in preserve-3d then grab the dirty rect that was given to
// the root and transform using the combined transform.
if (combines3DTransformWithAncestors) {
visibleRect = dirtyRect = aBuilder->GetPreserves3DRect();
}
const float appPerDev = PresContext()->AppUnitsPerDevPixel();
uint32_t flags = nsDisplayTransform::kTransformRectFlags &
~nsDisplayTransform::OFFSET_BY_ORIGIN;
if (!hasPerspective) {
flags &= ~nsDisplayTransform::INCLUDE_PERSPECTIVE;
}
if (!combines3DTransformWithAncestors) {
flags &= ~nsDisplayTransform::INCLUDE_PRESERVE3D_ANCESTORS;
}
auto transform = nsDisplayTransform::GetResultingTransformMatrix(
this, nsPoint(), appPerDev, flags);
nsRect untransformedDirtyRect;
if (nsDisplayTransform::UntransformRect(dirtyRect, overflow, transform,
appPerDev,
&untransformedDirtyRect)) {
dirtyRect = untransformedDirtyRect;
nsDisplayTransform::UntransformRect(visibleRect, overflow, transform,
appPerDev, &visibleRect);
} else {
// This should only happen if the transform is singular, in which case
// nothing is visible anyway
dirtyRect.SetEmpty();
visibleRect.SetEmpty();
}
}
}
inTransform = true;
} else if (IsFixedPosContainingBlock()) {
// Restict the building area to the overflow rect for these frames, since
// RetainedDisplayListBuilder uses it to know if the size of the stacking
// context changed.
visibleRect.IntersectRect(visibleRect, InkOverflowRect());
dirtyRect.IntersectRect(dirtyRect, InkOverflowRect());
}
bool hasOverrideDirtyRect = false;
// If we're doing a partial build, we're not invalid and we're capable
// of having an override building rect (stacking context and fixed pos
// containing block), then we should assume we have one.
// Either we have an explicit one, or nothing in our subtree changed and
// we have an implicit empty rect.
//
// These conditions should match |CanStoreDisplayListBuildingRect()| in
// RetainedDisplayListBuilder.cpp
if (!aBuilder->IsReusingStackingContextItems() &&
aBuilder->IsPartialUpdate() && !aBuilder->InInvalidSubtree() &&
!IsFrameModified() && IsFixedPosContainingBlock() &&
!GetPrevContinuation() && !GetNextContinuation()) {
dirtyRect = nsRect();
if (HasOverrideDirtyRegion()) {
nsDisplayListBuilder::DisplayListBuildingData* data =
GetProperty(nsDisplayListBuilder::DisplayListBuildingRect());
if (data) {
dirtyRect = data->mDirtyRect.Intersect(visibleRect);
hasOverrideDirtyRect = true;
}
}
}
bool usingFilter = effects->HasFilters() && !style.IsRootElementStyle();
SVGUtils::MaskUsage maskUsage = SVGUtils::DetermineMaskUsage(this, false);
bool usingMask = maskUsage.UsingMaskOrClipPath();
bool usingSVGEffects = usingFilter || usingMask;
nsRect visibleRectOutsideSVGEffects = visibleRect;
nsDisplayList hoistedScrollInfoItemsStorage(aBuilder);
if (usingSVGEffects) {
dirtyRect =
SVGIntegrationUtils::GetRequiredSourceForInvalidArea(this, dirtyRect);
visibleRect =
SVGIntegrationUtils::GetRequiredSourceForInvalidArea(this, visibleRect);
aBuilder->EnterSVGEffectsContents(this, &hoistedScrollInfoItemsStorage);
}
bool useStickyPosition = disp->mPosition == StylePositionProperty::Sticky;
bool useFixedPosition =
disp->mPosition == StylePositionProperty::Fixed &&
(DisplayPortUtils::IsFixedPosFrameInDisplayPort(this) ||
BuilderHasScrolledClip(aBuilder));
nsDisplayListBuilder::AutoBuildingDisplayList buildingDisplayList(
aBuilder, this, visibleRect, dirtyRect, isTransformed);
UpdateCurrentHitTestInfo(aBuilder, this);
// Depending on the effects that are applied to this frame, we can create
// multiple container display items and wrap them around our contents.
// This enum lists all the potential container display items, in the order
// outside to inside.
enum class ContainerItemType : uint8_t {
None = 0,
OwnLayerIfNeeded,
BlendMode,
FixedPosition,
OwnLayerForTransformWithRoundedClip,
Perspective,
Transform,
SeparatorTransforms,
Opacity,
Filter,
BlendContainer
};
nsDisplayListBuilder::AutoContainerASRTracker contASRTracker(aBuilder);
auto cssClip = GetClipPropClipRect(disp, effects, GetSize());
auto ApplyClipProp = [&](DisplayListClipState::AutoSaveRestore& aClipState) {
if (!cssClip) {
return;
}
nsPoint offset = aBuilder->GetCurrentFrameOffsetToReferenceFrame();
aBuilder->IntersectDirtyRect(*cssClip);
aBuilder->IntersectVisibleRect(*cssClip);
aClipState.ClipContentDescendants(*cssClip + offset);
};
// The CSS clip property is effectively inside the transform, but outside the
// filters. So if we're not transformed we can apply it just here for
// simplicity, instead of on each of the places that handle clipCapturedBy.
DisplayListClipState::AutoSaveRestore untransformedCssClip(aBuilder);
if (!isTransformed) {
ApplyClipProp(untransformedCssClip);
}
// If there is a current clip, then depending on the container items we
// create, different things can happen to it. Some container items simply
// propagate the clip to their children and aren't clipped themselves.
// But other container items, especially those that establish a different
// geometry for their contents (e.g. transforms), capture the clip on
// themselves and unset the clip for their contents. If we create more than
// one of those container items, the clip will be captured on the outermost
// one and the inner container items will be unclipped.
ContainerItemType clipCapturedBy = ContainerItemType::None;
if (useFixedPosition) {
clipCapturedBy = ContainerItemType::FixedPosition;
} else if (isTransformed) {
const DisplayItemClipChain* currentClip =
aBuilder->ClipState().GetCurrentCombinedClipChain(aBuilder);
if ((hasPerspective || extend3DContext) &&
(currentClip && currentClip->HasRoundedCorners())) {
// If we're creating an nsDisplayTransform item that is going to combine
// its transform with its children (preserve-3d or perspective), then we
// can't have an intermediate surface. Mask layers force an intermediate
// surface, so if we're going to need both then create a separate
// wrapping layer for the mask.
clipCapturedBy = ContainerItemType::OwnLayerForTransformWithRoundedClip;
} else if (hasPerspective) {
clipCapturedBy = ContainerItemType::Perspective;
} else {
clipCapturedBy = ContainerItemType::Transform;
}
} else if (usingFilter) {
clipCapturedBy = ContainerItemType::Filter;
}
DisplayListClipState::AutoSaveRestore clipState(aBuilder);
if (clipCapturedBy != ContainerItemType::None) {
clipState.Clear();
}
DisplayListClipState::AutoSaveRestore transformedCssClip(aBuilder);
if (isTransformed) {
// filters, this clips the input to the filters as well, which is not
// correct (clipping by the `clip` property is supposed to happen after
// applying the filter effects, per [1].
//
// This is not a regression though, since we used to do that anyway before
//
ApplyClipProp(transformedCssClip);
}
uint32_t numActiveScrollframesEncounteredBefore =
aBuilder->GetNumActiveScrollframesEncountered();
nsDisplayListCollection set(aBuilder);
Maybe<nsRect> clipForMask;
{
DisplayListClipState::AutoSaveRestore nestedClipState(aBuilder);
nsDisplayListBuilder::AutoInTransformSetter inTransformSetter(aBuilder,
inTransform);
nsDisplayListBuilder::AutoEnterFilter filterASRSetter(aBuilder,
usingFilter);
nsDisplayListBuilder::AutoInEventsOnly inEventsSetter(
aBuilder, opacityItemForEventsOnly);
// If we have a mask, compute a clip to bound the masked content.
// This is necessary in case the content moves with an ancestor
// ASR of the mask.
// Don't do this if we also have a filter, because then the clip
// would be applied before the filter, violating
// Filters are a containing block for fixed and absolute descendants,
// so the masked content cannot move with an ancestor ASR.
if (usingMask && !usingFilter) {
clipForMask = ComputeClipForMaskItem(aBuilder, this, maskUsage);
if (clipForMask) {
aBuilder->IntersectDirtyRect(*clipForMask);
aBuilder->IntersectVisibleRect(*clipForMask);
nestedClipState.ClipContentDescendants(
*clipForMask + aBuilder->GetCurrentFrameOffsetToReferenceFrame());
}
}
// extend3DContext also guarantees that applyAbsPosClipping and
// usingSVGEffects are false We only modify the preserve-3d rect if we are
// the top of a preserve-3d heirarchy
if (extend3DContext) {
// Mark these first so MarkAbsoluteFramesForDisplayList knows if we are
// going to be forced to descend into frames.
aBuilder->MarkPreserve3DFramesForDisplayList(this);
}
aBuilder->AdjustWindowDraggingRegion(this);
MarkAbsoluteFramesForDisplayList(aBuilder);
aBuilder->Check();
BuildDisplayList(aBuilder, set);
SetBuiltDisplayList(true);
aBuilder->Check();
aBuilder->DisplayCaret(this, set.Outlines());
// Blend modes are a real pain for retained display lists. We build a blend
// container item if the built list contains any blend mode items within
// the current stacking context. This can change without an invalidation
// to the stacking context frame, or the blend mode frame (e.g. by moving
// an intermediate frame).
// When we gain/remove a blend container item, we need to mark this frame
// as invalid and have the full display list for merging to track
// the change correctly.
// It seems really hard to track this in advance, as the bookkeeping
// required to note which stacking contexts have blend descendants
// is complex and likely to be buggy.
// Instead we're doing the sad thing, detecting it afterwards, and just
// repeating display list building if it changed.
// We have to repeat building for the entire display list (or at least
// the outer stacking context), since we need to mark this frame as invalid
// to remove any existing content that isn't wrapped in the blend container,
// and then we need to build content infront/behind the blend container
// to get correct positioning during merging.
if (aBuilder->ContainsBlendMode() && aBuilder->IsRetainingDisplayList()) {
if (aBuilder->IsPartialUpdate()) {
aBuilder->SetPartialBuildFailed(true);
} else {
aBuilder->SetDisablePartialUpdates(true);
}
}
}
if (aBuilder->IsBackgroundOnly()) {
set.BlockBorderBackgrounds()->DeleteAll(aBuilder);
set.Floats()->DeleteAll(aBuilder);
set.Content()->DeleteAll(aBuilder);
set.PositionedDescendants()->DeleteAll(aBuilder);
set.Outlines()->DeleteAll(aBuilder);
}
if (hasOverrideDirtyRect &&
StaticPrefs::layout_display_list_show_rebuild_area()) {
nsDisplaySolidColor* color = MakeDisplayItem<nsDisplaySolidColor>(
aBuilder, this,
dirtyRect + aBuilder->GetCurrentFrameOffsetToReferenceFrame(),
NS_RGBA(255, 0, 0, 64), false);
if (color) {
color->SetOverrideZIndex(INT32_MAX);
set.PositionedDescendants()->AppendToTop(color);
}
}
nsIContent* content = GetContent();
if (!content) {
content = PresContext()->Document()->GetRootElement();
}
nsDisplayList resultList(aBuilder);
set.SerializeWithCorrectZOrder(&resultList, content);
// Get the ASR to use for the container items that we create here.
const ActiveScrolledRoot* containerItemASR = contASRTracker.GetContainerASR();
bool createdContainer = false;
// If adding both a nsDisplayBlendContainer and a nsDisplayBlendMode to the
// same list, the nsDisplayBlendContainer should be added first. This only
// happens when the element creating this stacking context has mix-blend-mode
// and also contains a child which has mix-blend-mode.
// The nsDisplayBlendContainer must be added to the list first, so it does not
// isolate the containing element blending as well.
if (aBuilder->ContainsBlendMode()) {
resultList.AppendToTop(nsDisplayBlendContainer::CreateForMixBlendMode(
aBuilder, this, &resultList, containerItemASR));
createdContainer = true;
}
if (usingBackdropFilter) {
nsRect backdropRect =
GetRectRelativeToSelf() + aBuilder->ToReferenceFrame(this);
resultList.AppendNewToTop<nsDisplayBackdropFilters>(
aBuilder, this, &resultList, backdropRect, this);
createdContainer = true;
}
// If there are any SVG effects, wrap the list up in an SVG effects item
// (which also handles CSS group opacity). Note that we create an SVG effects
// item even if resultList is empty, since a filter can produce graphical
// output even if the element being filtered wouldn't otherwise do so.
if (usingSVGEffects) {
MOZ_ASSERT(usingFilter || usingMask,
"Beside filter & mask/clip-path, what else effect do we have?");
if (clipCapturedBy == ContainerItemType::Filter) {
clipState.Restore();
}
// Revert to the post-filter dirty rect.
aBuilder->SetVisibleRect(visibleRectOutsideSVGEffects);
// Skip all filter effects while generating glyph mask.
if (usingFilter && !aBuilder->IsForGenerateGlyphMask()) {
/* List now emptied, so add the new list to the top. */
resultList.AppendNewToTop<nsDisplayFilters>(aBuilder, this, &resultList,
this, usingBackdropFilter);
createdContainer = true;
}
if (usingMask) {
// The mask should move with aBuilder->CurrentActiveScrolledRoot(), so
// that's the ASR we prefer to use for the mask item. However, we can
// only do this if the mask if clipped with respect to that ASR, because
// an item always needs to have finite bounds with respect to its ASR.
// If we weren't able to compute a clip for the mask, we fall back to
// using containerItemASR, which is the lowest common ancestor clip of
// the mask's contents. That's not entirely correct, but it satisfies
// the base requirement of the ASR system (that items have finite bounds
// wrt. their ASR).
const ActiveScrolledRoot* maskASR =
clipForMask.isSome() ? aBuilder->CurrentActiveScrolledRoot()
: containerItemASR;
/* List now emptied, so add the new list to the top. */
resultList.AppendNewToTop<nsDisplayMasksAndClipPaths>(
aBuilder, this, &resultList, maskASR, usingBackdropFilter);
createdContainer = true;
}
// TODO(miko): We could probably create a wraplist here and avoid creating
// it later in |BuildDisplayListForChild()|.
createdContainer = false;
// Also add the hoisted scroll info items. We need those for APZ scrolling
// because nsDisplayMasksAndClipPaths items can't build active layers.
aBuilder->ExitSVGEffectsContents();
resultList.AppendToTop(&hoistedScrollInfoItemsStorage);
}
// If the list is non-empty and there is CSS group opacity without SVG
// effects, wrap it up in an opacity item.
if (useOpacity) {
const bool needsActiveOpacityLayer =
nsDisplayOpacity::NeedsActiveLayer(aBuilder, this);
resultList.AppendNewToTop<nsDisplayOpacity>(
aBuilder, this, &resultList, containerItemASR, opacityItemForEventsOnly,
needsActiveOpacityLayer, usingBackdropFilter);
createdContainer = true;
}
// If we're going to apply a transformation and don't have preserve-3d set,
// wrap everything in an nsDisplayTransform. If there's nothing in the list,
// don't add anything.
//
// For the preserve-3d case we want to individually wrap every child in the
// list with a separate nsDisplayTransform instead. When the child is already
// an nsDisplayTransform, we can skip this step, as the computed transform
// will already include our own.
//
// We also traverse into sublists created by nsDisplayWrapList, so that we
// find all the correct children.
if (isTransformed && extend3DContext) {
// Install dummy nsDisplayTransform as a leaf containing
// descendants not participating this 3D rendering context.
nsDisplayList nonparticipants(aBuilder);
nsDisplayList participants(aBuilder);
int index = 1;
nsDisplayItem* separator = nullptr;
// TODO: This can be simplified: |participants| is just |resultList|.
for (nsDisplayItem* item : resultList.TakeItems()) {
if (ItemParticipatesIn3DContext(this, item) &&
!item->GetClip().HasClip()) {
// The frame of this item participates the same 3D context.
WrapSeparatorTransform(aBuilder, this, &nonparticipants, &participants,
index++, &separator);
participants.AppendToTop(item);
} else {
// The frame of the item doesn't participate the current
// context, or has no transform.
//
// For items participating but not transformed, they are add
// to nonparticipants to get a separator layer for handling
// clips, if there is, on an intermediate surface.
// \see ContainerLayer::DefaultComputeEffectiveTransforms().
nonparticipants.AppendToTop(item);
}
}
WrapSeparatorTransform(aBuilder, this, &nonparticipants, &participants,
index++, &separator);
if (separator) {
createdContainer = true;
}
resultList.AppendToTop(&participants);
}
if (isTransformed) {
transformedCssClip.Restore();
if (clipCapturedBy == ContainerItemType::Transform) {
// Restore clip state now so nsDisplayTransform is clipped properly.
clipState.Restore();
}
// Revert to the dirtyrect coming in from the parent, without our transform
// taken into account.
aBuilder->SetVisibleRect(visibleRectOutsideTransform);
if (this != aBuilder->RootReferenceFrame()) {
// Revert to the outer reference frame and offset because all display
// items we create from now on are outside the transform.
nsPoint toOuterReferenceFrame;
const nsIFrame* outerReferenceFrame =
aBuilder->FindReferenceFrameFor(GetParent(), &toOuterReferenceFrame);
toOuterReferenceFrame += GetPosition();
buildingDisplayList.SetReferenceFrameAndCurrentOffset(
outerReferenceFrame, toOuterReferenceFrame);
}
// We would like to block async animations for ancestors of ones not
// prerendered in the preserve-3d tree. Now that we've finished processing
// all descendants, update allowAsyncAnimation to take their prerender
// state into account
// FIXME: We don't block async animations for previous siblings because
// their prerender decisions have been made. We may have to figure out a
// better way to rollback their prerender decisions.
// Alternatively we could not block animations for later siblings, and only
// block them for ancestors of a blocked one.
if ((extend3DContext || combines3DTransformWithAncestors) &&
prerenderInfo.CanUseAsyncAnimations() &&
!aBuilder->GetPreserves3DAllowAsyncAnimation()) {
// aBuilder->GetPreserves3DAllowAsyncAnimation() means the inner or
// previous silbing frames are allowed/disallowed for async animations.
prerenderInfo.mDecision = nsDisplayTransform::PrerenderDecision::No;
}
nsDisplayTransform* transformItem = MakeDisplayItem<nsDisplayTransform>(
aBuilder, this, &resultList, visibleRect, prerenderInfo.mDecision,
usingBackdropFilter);
if (transformItem) {
resultList.AppendToTop(transformItem);
createdContainer = true;
if (numActiveScrollframesEncounteredBefore !=
aBuilder->GetNumActiveScrollframesEncountered()) {
transformItem->SetContainsASRs(true);
}
if (hasPerspective) {
transformItem->MarkWithAssociatedPerspective();
if (clipCapturedBy == ContainerItemType::Perspective) {
clipState.Restore();
}
resultList.AppendNewToTop<nsDisplayPerspective>(aBuilder, this,
&resultList);
createdContainer = true;
}
}
}
if (clipCapturedBy ==
ContainerItemType::OwnLayerForTransformWithRoundedClip) {
clipState.Restore();
resultList.AppendNewToTopWithIndex<nsDisplayOwnLayer>(
aBuilder, this,
/* aIndex = */ nsDisplayOwnLayer::OwnLayerForTransformWithRoundedClip,
&resultList, aBuilder->CurrentActiveScrolledRoot(),
nsDisplayOwnLayerFlags::None, ScrollbarData{},
/* aForceActive = */ false, false);
createdContainer = true;
}
// If we have sticky positioning, wrap it in a sticky position item.
if (useFixedPosition) {
if (clipCapturedBy == ContainerItemType::FixedPosition) {
clipState.Restore();
}
// The ASR for the fixed item should be the ASR of our containing block,
// which has been set as the builder's current ASR, unless this frame is
// invisible and we hadn't saved display item data for it. In that case,
// we need to take the containerItemASR since we might have fixed children.
// For WebRender, we want to the know what |containerItemASR| is for the
// case where the fixed-pos item is not a "real" fixed-pos item (e.g. it's
// nested inside a scrolling transform), so we stash that on the display
// item as well.
const ActiveScrolledRoot* fixedASR = ActiveScrolledRoot::PickAncestor(
containerItemASR, aBuilder->CurrentActiveScrolledRoot());
resultList.AppendNewToTop<nsDisplayFixedPosition>(
aBuilder, this, &resultList, fixedASR, containerItemASR);
createdContainer = true;
} else if (useStickyPosition) {
// For position:sticky, the clip needs to be applied both to the sticky
// container item and to the contents. The container item needs the clip
// because a scrolled clip needs to move independently from the sticky
// contents, and the contents need the clip so that they have finite
// clipped bounds with respect to the container item's ASR. The latter is
// a little tricky in the case where the sticky item has both fixed and
// non-fixed descendants, because that means that the sticky container
// item's ASR is the ASR of the fixed descendant.
// For WebRender display list building, though, we still want to know the
// the ASR that the sticky container item would normally have, so we stash
// that on the display item as the "container ASR" (i.e. the normal ASR of
// the container item, excluding the special behaviour induced by fixed
// descendants).
const ActiveScrolledRoot* stickyASR = ActiveScrolledRoot::PickAncestor(
containerItemASR, aBuilder->CurrentActiveScrolledRoot());
auto* stickyItem = MakeDisplayItem<nsDisplayStickyPosition>(
aBuilder, this, &resultList, stickyASR,
aBuilder->CurrentActiveScrolledRoot(),
clipState.IsClippedToDisplayPort());
bool shouldFlatten = true;
StickyScrollContainer* stickyScrollContainer =
StickyScrollContainer::GetStickyScrollContainerForFrame(this);
if (stickyScrollContainer && stickyScrollContainer->ScrollContainer()
->IsMaybeAsynchronouslyScrolled()) {
shouldFlatten = false;
}
stickyItem->SetShouldFlatten(shouldFlatten);
resultList.AppendToTop(stickyItem);
createdContainer = true;
// If the sticky element is inside a filter, annotate the scroll frame that
// scrolls the filter as having out-of-flow content inside a filter (this
// inhibits paint skipping).
if (aBuilder->GetFilterASR() && aBuilder->GetFilterASR() == stickyASR) {
aBuilder->GetFilterASR()
->mScrollContainerFrame->SetHasOutOfFlowContentInsideFilter();
}
}
// If there's blending, wrap up the list in a blend-mode item. Note that
// opacity can be applied before blending as the blend color is not affected
// by foreground opacity (only background alpha).
if (useBlendMode) {
DisplayListClipState::AutoSaveRestore blendModeClipState(aBuilder);
resultList.AppendNewToTop<nsDisplayBlendMode>(aBuilder, this, &resultList,
effects->mMixBlendMode,
containerItemASR, false);
createdContainer = true;
}
if (aBuilder->IsReusingStackingContextItems()) {
if (resultList.IsEmpty()) {
return;
}
nsDisplayItem* container = resultList.GetBottom();
if (resultList.Length() > 1 || container->Frame() != this) {
container = MakeDisplayItem<nsDisplayContainer>(
aBuilder, this, containerItemASR, &resultList);
} else {
MOZ_ASSERT(resultList.Length() == 1);
resultList.Clear();
}
// Mark the outermost display item as reusable. These display items and
// their chidren can be reused during the next paint if no ancestor or
// descendant frames have been modified.
if (!container->IsReusedItem()) {
container->SetReusable();
}
aList->AppendToTop(container);
createdContainer = true;
} else {
aList->AppendToTop(&resultList);
}
if (aCreatedContainerItem) {
*aCreatedContainerItem = createdContainer;
}
}
static nsDisplayItem* WrapInWrapList(nsDisplayListBuilder* aBuilder,
nsIFrame* aFrame, nsDisplayList* aList,
const ActiveScrolledRoot* aContainerASR,
bool aBuiltContainerItem = false) {
nsDisplayItem* item = aList->GetBottom();
if (!item) {
return nullptr;
}
// We need a wrap list if there are multiple items, or if the single
// item has a different frame. This can change in a partial build depending
// on which items we build, so we need to ensure that we don't transition
// to/from a wrap list without invalidating correctly.
bool needsWrapList =
aList->Length() > 1 || item->Frame() != aFrame || item->GetChildren();
// If we have an explicit container item (that can't change without an
// invalidation) or we're doing a full build and don't need a wrap list, then
// we can skip adding one.
if (aBuiltContainerItem || (!aBuilder->IsPartialUpdate() && !needsWrapList)) {
MOZ_ASSERT(aList->Length() == 1);
aList->Clear();
return item;
}
// If we're doing a partial build and we didn't need a wrap list
// previously then we can try to work from there.
if (aBuilder->IsPartialUpdate() &&
!aFrame->HasDisplayItem(uint32_t(DisplayItemType::TYPE_CONTAINER))) {
// If we now need a wrap list, we must previously have had no display items
// or a single one belonging to this frame. Mark the item itself as
// discarded so that RetainedDisplayListBuilder uses the ones we just built.
// We don't want to mark the frame as modified as that would invalidate
// positioned descendants that might be outside of this list, and might not
// have been rebuilt this time.
if (needsWrapList) {
DiscardOldItems(aFrame);
} else {
MOZ_ASSERT(aList->Length() == 1);
aList->Clear();
return item;
}
}
// The last case we could try to handle is when we previously had a wrap list,
// but no longer need it. Unfortunately we can't differentiate this case from
// a partial build where other children exist but we just didn't build them
// this time.
// TODO:RetainedDisplayListBuilder's merge phase has the full list and
// could strip them out.
return MakeDisplayItem<nsDisplayContainer>(aBuilder, aFrame, aContainerASR,
aList);
}
/**
* Check if a frame should be visited for building display list.
*/
static bool DescendIntoChild(nsDisplayListBuilder* aBuilder,
const nsIFrame* aChild, const nsRect& aVisible,
const nsRect& aDirty) {
if (aChild->HasAnyStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO)) {
return true;
}
// If the child is a scrollframe that we want to ignore, then we need
// to descend into it because its scrolled child may intersect the dirty
// area even if the scrollframe itself doesn't.
if (aChild == aBuilder->GetIgnoreScrollFrame()) {
return true;
}
// There are cases where the "ignore scroll frame" on the builder is not set
// correctly, and so we additionally want to catch cases where the child is
// a root scrollframe and we are ignoring scrolling on the viewport.
if (aChild == aBuilder->GetPresShellIgnoreScrollFrame()) {
return true;
}
nsRect overflow = aChild->InkOverflowRect();
// On mobile, there may be a dynamic toolbar. The root content document's
// root scroll frame's ink overflow rect does not include the toolbar
// height, but if the toolbar is hidden, we still want to be able to target
// content underneath the toolbar, so expand the overflow rect here to
// allow display list building to descend into the scroll frame.
if (aBuilder->IsForEventDelivery() &&
aChild == aChild->PresShell()->GetRootScrollContainerFrame() &&
aChild->PresContext()->IsRootContentDocumentCrossProcess() &&
aChild->PresContext()->HasDynamicToolbar()) {
overflow.SizeTo(nsLayoutUtils::ExpandHeightForDynamicToolbar(
aChild->PresContext(), overflow.Size()));
}
if (aDirty.Intersects(overflow)) {
return true;
}
if (aChild->ForceDescendIntoIfVisible() && aVisible.Intersects(overflow)) {
return true;
}
if (aChild->IsTablePart()) {
// Relative positioning and transforms can cause table parts to move, but we
// will still paint the backgrounds for their ancestor parts under them at
// their 'normal' position. That means that we must consider the overflow
// rects at both positions.
// We convert the overflow rect into the nsTableFrame's coordinate
// space, applying the normal position offset at each step. Then we
// compare that against the builder's cached dirty rect in table
// coordinate space.
const nsIFrame* f = aChild;
nsRect normalPositionOverflowRelativeToTable = overflow;
while (f->IsTablePart()) {
normalPositionOverflowRelativeToTable += f->GetNormalPosition();
f = f->GetParent();
}
nsDisplayTableBackgroundSet* tableBGs = aBuilder->GetTableBackgroundSet();
if (tableBGs && tableBGs->GetDirtyRect().Intersects(
normalPositionOverflowRelativeToTable)) {
return true;
}
}
return false;
}
void nsIFrame::BuildDisplayListForSimpleChild(nsDisplayListBuilder* aBuilder,
nsIFrame* aChild,
const nsDisplayListSet& aLists) {
// This is the shortcut for frames been handled along the common
// path, the most common one of THE COMMON CASE mentioned later.
MOZ_ASSERT(aChild->Type() != LayoutFrameType::Placeholder);
MOZ_ASSERT(!aBuilder->GetSelectedFramesOnly() &&
!aBuilder->GetIncludeAllOutOfFlows(),
"It should be held for painting to window");
MOZ_ASSERT(aChild->HasAnyStateBits(NS_FRAME_SIMPLE_DISPLAYLIST));
const nsPoint offset = aChild->GetOffsetTo(this);
const nsRect visible = aBuilder->GetVisibleRect() - offset;
const nsRect dirty = aBuilder->GetDirtyRect() - offset;
if (!DescendIntoChild(aBuilder, aChild, visible, dirty)) {
DL_LOGV("Skipped frame %p", aChild);
return;
}
// Child cannot be transformed since it is not a stacking context.
nsDisplayListBuilder::AutoBuildingDisplayList buildingForChild(
aBuilder, aChild, visible, dirty, false);
UpdateCurrentHitTestInfo(aBuilder, aChild);
aChild->MarkAbsoluteFramesForDisplayList(aBuilder);
aBuilder->AdjustWindowDraggingRegion(aChild);
aBuilder->Check();
aChild->BuildDisplayList(aBuilder, aLists);
aChild->SetBuiltDisplayList(true);
aBuilder->Check();
aBuilder->DisplayCaret(aChild, aLists.Outlines());
}
static bool ShouldSkipFrame(nsDisplayListBuilder* aBuilder,
const nsIFrame* aFrame) {
// If painting is restricted to just the background of the top level frame,
// then we have nothing to do here.
if (aBuilder->IsBackgroundOnly()) {
return true;
}
if (aBuilder->IsForGenerateGlyphMask() &&
(!aFrame->IsTextFrame() && aFrame->IsLeaf())) {
return true;
}
// The placeholder frame should have the same content as the OOF frame.
if (aBuilder->GetSelectedFramesOnly() &&
(aFrame->IsLeaf() && !aFrame->IsSelected())) {
return true;
}
static const nsFrameState skipFlags =
(NS_FRAME_TOO_DEEP_IN_FRAME_TREE | NS_FRAME_IS_NONDISPLAY);
if (aFrame->HasAnyStateBits(skipFlags)) {
return true;
}
return aFrame->StyleUIReset()->mMozSubtreeHiddenOnlyVisually;
}
void nsIFrame::BuildDisplayListForChild(nsDisplayListBuilder* aBuilder,
nsIFrame* aChild,
const nsDisplayListSet& aLists,
DisplayChildFlags aFlags) {
AutoCheckBuilder check(aBuilder);
#ifdef DEBUG
DL_LOGV("BuildDisplayListForChild (%p) <", aChild);
ScopeExit e(
[aChild]() { DL_LOGV("> BuildDisplayListForChild (%p)", aChild); });
#endif
if (ShouldSkipFrame(aBuilder, aChild)) {
return;
}
if (HidesContent()) {
return;
}
nsIFrame* child = aChild;
auto* placeholder = child->IsPlaceholderFrame()
? static_cast<nsPlaceholderFrame*>(child)
: nullptr;
nsIFrame* childOrOutOfFlow =
placeholder ? placeholder->GetOutOfFlowFrame() : child;
// If we're generating a display list for printing, include Link items for
// frames that correspond to HTML link elements so that we can have active
// links in saved PDF output. Note that the state of "within a link" is
// set on the display-list builder, such that all descendants of the link
// element will generate display-list links.
// TODO: we should be able to optimize this so as to avoid creating links
// for the same destination that entirely overlap each other, which adds
// nothing useful to the final PDF.
Maybe<nsDisplayListBuilder::Linkifier> linkifier;
if (StaticPrefs::print_save_as_pdf_links_enabled() &&
aBuilder->IsForPrinting()) {
linkifier.emplace(aBuilder, childOrOutOfFlow, aLists.Content());
linkifier->MaybeAppendLink(aBuilder, childOrOutOfFlow);
}
nsIFrame* parent = childOrOutOfFlow->GetParent();
const auto* parentDisplay = parent->StyleDisplay();
const auto overflowClipAxes =
parent->ShouldApplyOverflowClipping(parentDisplay);
const bool isPaintingToWindow = aBuilder->IsPaintingToWindow();
const bool doingShortcut =
isPaintingToWindow &&
child->HasAnyStateBits(NS_FRAME_SIMPLE_DISPLAYLIST) &&
// Animations may change the stacking context state.
// ShouldApplyOverflowClipping is affected by the parent style, which does
// not invalidate the NS_FRAME_SIMPLE_DISPLAYLIST bit.
!(!overflowClipAxes.isEmpty() || child->MayHaveTransformAnimation() ||
child->MayHaveOpacityAnimation());
if (aBuilder->IsForPainting()) {
aBuilder->ClearWillChangeBudgetStatus(child);
}
if (StaticPrefs::layout_css_scroll_anchoring_highlight()) {
if (child->FirstContinuation()->IsScrollAnchor()) {
nsRect bounds = child->GetContentRectRelativeToSelf() +
aBuilder->ToReferenceFrame(child);
nsDisplaySolidColor* color = MakeDisplayItem<nsDisplaySolidColor>(
aBuilder, child, bounds, NS_RGBA(255, 0, 255, 64));
if (color) {
color->SetOverrideZIndex(INT32_MAX);
aLists.PositionedDescendants()->AppendToTop(color);
}
}
}
if (doingShortcut) {
BuildDisplayListForSimpleChild(aBuilder, child, aLists);
return;
}
// dirty rect in child-relative coordinates
NS_ASSERTION(aBuilder->GetCurrentFrame() == this, "Wrong coord space!");
const nsPoint offset = child->GetOffsetTo(this);
nsRect visible = aBuilder->GetVisibleRect() - offset;
nsRect dirty = aBuilder->GetDirtyRect() - offset;
nsDisplayListBuilder::OutOfFlowDisplayData* savedOutOfFlowData = nullptr;
if (placeholder) {
if (placeholder->HasAnyStateBits(PLACEHOLDER_FOR_TOPLAYER)) {
// If the out-of-flow frame is in the top layer, the viewport frame
// will paint it. Skip it here. Note that, only out-of-flow frames
// with this property should be skipped, because non-HTML elements
// may stop their children from being out-of-flow. Those frames
// should still be handled in the normal in-flow path.
return;
}
child = childOrOutOfFlow;
if (aBuilder->IsForPainting()) {
aBuilder->ClearWillChangeBudgetStatus(child);
}
// If 'child' is a pushed float then it's owned by a block that's not an
// ancestor of the placeholder, and it will be painted by that block and
// should not be painted through the placeholder. Also recheck
// NS_FRAME_TOO_DEEP_IN_FRAME_TREE and NS_FRAME_IS_NONDISPLAY.
static const nsFrameState skipFlags =
(NS_FRAME_IS_PUSHED_FLOAT | NS_FRAME_TOO_DEEP_IN_FRAME_TREE |
NS_FRAME_IS_NONDISPLAY);
if (child->HasAnyStateBits(skipFlags) || nsLayoutUtils::IsPopup(child)) {
return;
}
MOZ_ASSERT(child->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW));
savedOutOfFlowData = nsDisplayListBuilder::GetOutOfFlowData(child);
if (aBuilder->GetIncludeAllOutOfFlows()) {
visible = child->InkOverflowRect();
dirty = child->InkOverflowRect();
} else if (savedOutOfFlowData) {
visible =
savedOutOfFlowData->GetVisibleRectForFrame(aBuilder, child, &dirty);
} else {
// The out-of-flow frame did not intersect the dirty area. We may still
// need to traverse into it, since it may contain placeholders we need
// to enter to reach other out-of-flow frames that are visible.
visible.SetEmpty();
dirty.SetEmpty();
}
}
NS_ASSERTION(!child->IsPlaceholderFrame(),
"Should have dealt with placeholders already");
if (!DescendIntoChild(aBuilder, child, visible, dirty)) {
DL_LOGV("Skipped frame %p", child);
return;
}
const bool isSVG = child->HasAnyStateBits(NS_FRAME_SVG_LAYOUT);
// This flag is raised if the control flow strays off the common path.
// The common path is the most common one of THE COMMON CASE mentioned later.
bool awayFromCommonPath = !isPaintingToWindow;
// true if this is a real or pseudo stacking context
bool pseudoStackingContext =
aFlags.contains(DisplayChildFlag::ForcePseudoStackingContext);
if (!pseudoStackingContext && !isSVG &&
aFlags.contains(DisplayChildFlag::Inline) &&
!child->IsLineParticipant()) {
// child is a non-inline frame in an inline context, i.e.,
// it acts like inline-block or inline-table. Therefore it is a
// pseudo-stacking-context.
pseudoStackingContext = true;
}
const nsStyleDisplay* ourDisp = StyleDisplay();
// Don't paint our children if the theme object is a leaf.
if (IsThemed(ourDisp) && !PresContext()->Theme()->WidgetIsContainer(
ourDisp->EffectiveAppearance())) {
return;
}
// Since we're now sure that we're adding this frame to the display list
// (which means we're painting it, modulo occlusion), mark it as visible
// within the displayport.
if (isPaintingToWindow && child->TrackingVisibility() &&
child->IsVisibleForPainting()) {
child->PresShell()->EnsureFrameInApproximatelyVisibleList(child);
awayFromCommonPath = true;
}
// Child is composited if it's transformed, partially transparent, or has
// SVG effects or a blend mode..
const nsStyleDisplay* disp = child->StyleDisplay();
const nsStyleEffects* effects = child->StyleEffects();
const bool isPositioned = disp->IsPositionedStyle();
const bool isStackingContext =
aFlags.contains(DisplayChildFlag::ForceStackingContext) ||
child->IsStackingContext(disp, effects);
if (pseudoStackingContext || isStackingContext || isPositioned ||
placeholder || (!isSVG && disp->IsFloating(child)) ||
(isSVG && effects->mClip.IsRect() && IsSVGContentWithCSSClip(child))) {
pseudoStackingContext = true;
awayFromCommonPath = true;
}
NS_ASSERTION(!isStackingContext || pseudoStackingContext,
"Stacking contexts must also be pseudo-stacking-contexts");
nsDisplayListBuilder::AutoBuildingDisplayList buildingForChild(
aBuilder, child, visible, dirty);
UpdateCurrentHitTestInfo(aBuilder, child);
DisplayListClipState::AutoClipMultiple clipState(aBuilder);
nsDisplayListBuilder::AutoCurrentActiveScrolledRootSetter asrSetter(aBuilder);
if (savedOutOfFlowData) {
aBuilder->SetBuildingInvisibleItems(false);
clipState.SetClipChainForContainingBlockDescendants(
savedOutOfFlowData->mContainingBlockClipChain);
asrSetter.SetCurrentActiveScrolledRoot(
savedOutOfFlowData->mContainingBlockActiveScrolledRoot);
asrSetter.SetCurrentScrollParentId(savedOutOfFlowData->mScrollParentId);
MOZ_ASSERT(awayFromCommonPath,
"It is impossible when savedOutOfFlowData is true");
} else if (HasAnyStateBits(NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO) &&
placeholder) {
NS_ASSERTION(visible.IsEmpty(), "should have empty visible rect");
// Every item we build from now until we descent into an out of flow that
// does have saved out of flow data should be invisible. This state gets
// restored when AutoBuildingDisplayList gets out of scope.
aBuilder->SetBuildingInvisibleItems(true);
// If we have nested out-of-flow frames and the outer one isn't visible
// then we won't have stored clip data for it. We can just clear the clip
// instead since we know we won't render anything, and the inner out-of-flow
// frame will setup the correct clip for itself.
clipState.SetClipChainForContainingBlockDescendants(nullptr);
}
// Setup clipping for the parent's overflow:clip,
// or overflow:hidden on elements that don't support scrolling (and therefore
// don't create nsHTML/XULScrollFrame). This clipping needs to not clip
// anything directly rendered by the parent, only the rendering of its
// children.
// Don't use overflowClip to restrict the dirty rect, since some of the
// descendants may not be clipped by it. Even if we end up with unnecessary
// display items, they'll be pruned during ComputeVisibility.
//
// FIXME(emilio): Why can't we handle this more similarly to `clip` (on the
// parent, rather than on the children)? Would ClipContentDescendants do what
// we want?
if (!overflowClipAxes.isEmpty()) {
ApplyOverflowClipping(aBuilder, parent, overflowClipAxes, clipState);
awayFromCommonPath = true;
}
nsDisplayList list(aBuilder);
nsDisplayList extraPositionedDescendants(aBuilder);
const ActiveScrolledRoot* wrapListASR;
bool builtContainerItem = false;
if (isStackingContext) {
// True stacking context.
// For stacking contexts, BuildDisplayListForStackingContext handles
// clipping and MarkAbsoluteFramesForDisplayList.
nsDisplayListBuilder::AutoContainerASRTracker contASRTracker(aBuilder);
child->BuildDisplayListForStackingContext(aBuilder, &list,
&builtContainerItem);
wrapListASR = contASRTracker.GetContainerASR();
if (!aBuilder->IsReusingStackingContextItems() &&
aBuilder->GetCaretFrame() == child) {
builtContainerItem = false;
}
} else {
Maybe<nsRect> clipPropClip =
child->GetClipPropClipRect(disp, effects, child->GetSize());
if (clipPropClip) {
aBuilder->IntersectVisibleRect(*clipPropClip);
aBuilder->IntersectDirtyRect(*clipPropClip);
clipState.ClipContentDescendants(*clipPropClip +
aBuilder->ToReferenceFrame(child));
awayFromCommonPath = true;
}
child->MarkAbsoluteFramesForDisplayList(aBuilder);
child->SetBuiltDisplayList(true);
// Some SVG frames might change opacity without invalidating the frame, so
// exclude them from the fast-path.
if (!awayFromCommonPath && !child->IsSVGFrame()) {
// The shortcut is available for the child for next time.
child->AddStateBits(NS_FRAME_SIMPLE_DISPLAYLIST);
}
if (!pseudoStackingContext) {
// THIS IS THE COMMON CASE.
// Not a pseudo or real stacking context. Do the simple thing and
// return early.
aBuilder->AdjustWindowDraggingRegion(child);
aBuilder->Check();
child->BuildDisplayList(aBuilder, aLists);
aBuilder->Check();
aBuilder->DisplayCaret(child, aLists.Outlines());
return;
}
// A pseudo-stacking context (e.g., a positioned element with z-index auto).
// We allow positioned descendants of the child to escape to our parent
// stacking context's positioned descendant list, because they might be
// z-index:non-auto
nsDisplayListCollection pseudoStack(aBuilder);
aBuilder->AdjustWindowDraggingRegion(child);
nsDisplayListBuilder::AutoContainerASRTracker contASRTracker(aBuilder);
aBuilder->Check();
child->BuildDisplayList(aBuilder, pseudoStack);
aBuilder->Check();
if (aBuilder->DisplayCaret(child, pseudoStack.Outlines())) {
builtContainerItem = false;
}
wrapListASR = contASRTracker.GetContainerASR();
list.AppendToTop(pseudoStack.BorderBackground());
list.AppendToTop(pseudoStack.BlockBorderBackgrounds());
list.AppendToTop(pseudoStack.Floats());
list.AppendToTop(pseudoStack.Content());
list.AppendToTop(pseudoStack.Outlines());
extraPositionedDescendants.AppendToTop(pseudoStack.PositionedDescendants());
}
buildingForChild.RestoreBuildingInvisibleItemsValue();
if (!list.IsEmpty()) {
if (isPositioned || isStackingContext) {
// Genuine stacking contexts, and positioned pseudo-stacking-contexts,
// go in this level.
nsDisplayItem* item = WrapInWrapList(aBuilder, child, &list, wrapListASR,
builtContainerItem);
if (isSVG) {
aLists.Content()->AppendToTop(item);
} else {
aLists.PositionedDescendants()->AppendToTop(item);
}
} else if (!isSVG && disp->IsFloating(child)) {
aLists.Floats()->AppendToTop(
WrapInWrapList(aBuilder, child, &list, wrapListASR));
} else {
aLists.Content()->AppendToTop(&list);
}
}
// We delay placing the positioned descendants of positioned frames to here,
// because in the absence of z-index this is the correct order for them.
// This doesn't affect correctness because the positioned descendants list
// is sorted by z-order and content in BuildDisplayListForStackingContext,
// but it means that sort routine needs to do less work.
aLists.PositionedDescendants()->AppendToTop(&extraPositionedDescendants);
}
void nsIFrame::MarkAbsoluteFramesForDisplayList(
nsDisplayListBuilder* aBuilder) {
if (IsAbsoluteContainer()) {
aBuilder->MarkFramesForDisplayList(
this, GetAbsoluteContainingBlock()->GetChildList());
}
}
nsresult nsIFrame::GetContentForEvent(const WidgetEvent* aEvent,
nsIContent** aContent) {
nsIFrame* f = nsLayoutUtils::GetNonGeneratedAncestor(this);
*aContent = f->GetContent();
NS_IF_ADDREF(*aContent);
return NS_OK;
}
void nsIFrame::FireDOMEvent(const nsAString& aDOMEventName,
nsIContent* aContent) {
nsIContent* target = aContent ? aContent : GetContent();
if (target) {
RefPtr<AsyncEventDispatcher> asyncDispatcher = new AsyncEventDispatcher(
target, aDOMEventName, CanBubble::eYes, ChromeOnlyDispatch::eNo);
DebugOnly<nsresult> rv = asyncDispatcher->PostDOMEvent();
NS_ASSERTION(NS_SUCCEEDED(rv), "AsyncEventDispatcher failed to dispatch");
}
}
nsresult nsIFrame::HandleEvent(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
if (aEvent->mMessage == eMouseMove) {
// XXX If the second argument of HandleDrag() is WidgetMouseEvent,
// the implementation becomes simpler.
return HandleDrag(aPresContext, aEvent, aEventStatus);
}
if ((aEvent->mClass == eMouseEventClass &&
aEvent->AsMouseEvent()->mButton == MouseButton::ePrimary) ||
aEvent->mClass == eTouchEventClass) {
if (aEvent->mMessage == eMouseDown || aEvent->mMessage == eTouchStart) {
HandlePress(aPresContext, aEvent, aEventStatus);
} else if (aEvent->mMessage == eMouseUp || aEvent->mMessage == eTouchEnd) {
HandleRelease(aPresContext, aEvent, aEventStatus);
}
return NS_OK;
}
// When secondary buttion is down, we need to move selection to make users
// possible to paste something at click point quickly.
// When middle button is down, we need to just move selection and focus at
// the clicked point. Note that even if middle click paste is not enabled,
// Chrome moves selection at middle mouse button down. So, we should follow
// the behavior for the compatibility.
if (aEvent->mMessage == eMouseDown) {
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (mouseEvent && (mouseEvent->mButton == MouseButton::eSecondary ||
mouseEvent->mButton == MouseButton::eMiddle)) {
if (*aEventStatus == nsEventStatus_eConsumeNoDefault) {
return NS_OK;
}
return MoveCaretToEventPoint(aPresContext, mouseEvent, aEventStatus);
}
}
return NS_OK;
}
nsresult nsIFrame::GetDataForTableSelection(
const nsFrameSelection* aFrameSelection, mozilla::PresShell* aPresShell,
WidgetMouseEvent* aMouseEvent, nsIContent** aParentContent,
int32_t* aContentOffset, TableSelectionMode* aTarget) {
if (!aFrameSelection || !aPresShell || !aMouseEvent || !aParentContent ||
!aContentOffset || !aTarget) {
return NS_ERROR_NULL_POINTER;
}
*aParentContent = nullptr;
*aContentOffset = 0;
*aTarget = TableSelectionMode::None;
int16_t displaySelection = aPresShell->GetSelectionFlags();
bool selectingTableCells = aFrameSelection->IsInTableSelectionMode();
// DISPLAY_ALL means we're in an editor.
// If already in cell selection mode,
// continue selecting with mouse drag or end on mouse up,
// or when using shift key to extend block of cells
// (Mouse down does normal selection unless Ctrl/Cmd is pressed)
bool doTableSelection =
displaySelection == nsISelectionDisplay::DISPLAY_ALL &&
selectingTableCells &&
(aMouseEvent->mMessage == eMouseMove ||
(aMouseEvent->mMessage == eMouseUp &&
aMouseEvent->mButton == MouseButton::ePrimary) ||
aMouseEvent->IsShift());
if (!doTableSelection) {
// In Browser, special 'table selection' key must be pressed for table
// selection or when just Shift is pressed and we're already in table/cell
// selection mode
#ifdef XP_MACOSX
doTableSelection = aMouseEvent->IsMeta() ||
(aMouseEvent->IsShift() && selectingTableCells);
#else
doTableSelection = aMouseEvent->IsControl() ||
(aMouseEvent->IsShift() && selectingTableCells);
#endif
}
if (!doTableSelection) {
return NS_OK;
}
// Get the cell frame or table frame (or parent) of the current content node
nsIFrame* frame = this;
bool foundCell = false;
bool foundTable = false;
// Get the limiting node to stop parent frame search
nsIContent* limiter = aFrameSelection->GetLimiter();
// If our content node is an ancestor of the limiting node,
// we should stop the search right now.
if (limiter && limiter->IsInclusiveDescendantOf(GetContent())) {
return NS_OK;
}
// We don't initiate row/col selection from here now,
// but we may in future
// bool selectColumn = false;
// bool selectRow = false;
while (frame) {
// Check for a table cell by querying to a known CellFrame interface
nsITableCellLayout* cellElement = do_QueryFrame(frame);
if (cellElement) {
foundCell = true;
// TODO: If we want to use proximity to top or left border
// for row and column selection, this is the place to do it
break;
} else {
// If not a cell, check for table
// This will happen when starting frame is the table or child of a table,
// such as a row (we were inbetween cells or in table border)
nsTableWrapperFrame* tableFrame = do_QueryFrame(frame);
if (tableFrame) {
foundTable = true;
// TODO: How can we select row when along left table edge
// or select column when along top edge?
break;
} else {
frame = frame->GetParent();
// Stop if we have hit the selection's limiting content node
if (frame && frame->GetContent() == limiter) {
break;
}
}
}
}
// We aren't in a cell or table
if (!foundCell && !foundTable) {
return NS_OK;
}
nsIContent* tableOrCellContent = frame->GetContent();
if (!tableOrCellContent) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIContent> parentContent = tableOrCellContent->GetParent();
if (!parentContent) {
return NS_ERROR_FAILURE;
}
const int32_t offset =
parentContent->ComputeIndexOf_Deprecated(tableOrCellContent);
// Not likely?
if (offset < 0) {
return NS_ERROR_FAILURE;
}
// Everything is OK -- set the return values
parentContent.forget(aParentContent);
*aContentOffset = offset;
#if 0
if (selectRow)
*aTarget = TableSelectionMode::Row;
else if (selectColumn)
*aTarget = TableSelectionMode::Column;
else
#endif
if (foundCell) {
*aTarget = TableSelectionMode::Cell;
} else if (foundTable) {
*aTarget = TableSelectionMode::Table;
}
return NS_OK;
}
static bool IsEditingHost(const nsIFrame* aFrame) {
nsIContent* content = aFrame->GetContent();
return content && content->IsEditingHost();
}
static StyleUserSelect UsedUserSelect(const nsIFrame* aFrame) {
if (aFrame->IsGeneratedContentFrame()) {
return StyleUserSelect::None;
}
//
// The used value is the same as the computed value, except:
//
// 1 - on editable elements where the used value is always 'contain'
// regardless of the computed value
// 2 - when the computed value is auto, in which case the used value is one
// of the other values...
//
// at used-value time instead of at computed-value time.
if (aFrame->IsTextInputFrame() || IsEditingHost(aFrame)) {
// We don't implement 'contain' itself, but we make 'text' behave as
// 'contain' for contenteditable and <input> / <textarea> elements anyway so
// this is ok.
return StyleUserSelect::Text;
}
auto style = aFrame->Style()->UserSelect();
if (style != StyleUserSelect::Auto) {
return style;
}
auto* parent = nsLayoutUtils::GetParentOrPlaceholderFor(aFrame);
return parent ? UsedUserSelect(parent) : StyleUserSelect::Text;
}
bool nsIFrame::IsSelectable(StyleUserSelect* aSelectStyle) const {
auto style = UsedUserSelect(this);
if (aSelectStyle) {
*aSelectStyle = style;
}
return style != StyleUserSelect::None;
}
bool nsIFrame::ShouldHaveLineIfEmpty() const {
switch (Style()->GetPseudoType()) {
case PseudoStyleType::NotPseudo:
break;
case PseudoStyleType::scrolledContent:
return GetParent()->ShouldHaveLineIfEmpty();
case PseudoStyleType::mozTextControlEditingRoot:
return true;
case PseudoStyleType::buttonContent:
// HTML quirk.
return GetContent()->IsHTMLElement(nsGkAtoms::input);
default:
return false;
}
return IsEditingHost(this);
}
/**
* Handles the Mouse Press Event for the frame
*/
NS_IMETHODIMP
nsIFrame::HandlePress(nsPresContext* aPresContext, WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
NS_ENSURE_ARG_POINTER(aEventStatus);
if (nsEventStatus_eConsumeNoDefault == *aEventStatus) {
return NS_OK;
}
NS_ENSURE_ARG_POINTER(aEvent);
if (aEvent->mClass == eTouchEventClass) {
return NS_OK;
}
return MoveCaretToEventPoint(aPresContext, aEvent->AsMouseEvent(),
aEventStatus);
}
nsresult nsIFrame::MoveCaretToEventPoint(nsPresContext* aPresContext,
WidgetMouseEvent* aMouseEvent,
nsEventStatus* aEventStatus) {
MOZ_ASSERT(aPresContext);
MOZ_ASSERT(aMouseEvent);
MOZ_ASSERT(aMouseEvent->mMessage == eMouseDown);
MOZ_ASSERT(aEventStatus);
MOZ_ASSERT(nsEventStatus_eConsumeNoDefault != *aEventStatus);
mozilla::PresShell* presShell = aPresContext->GetPresShell();
if (!presShell) {
return NS_ERROR_FAILURE;
}
// We often get out of sync state issues with mousedown events that
// get interrupted by alerts/dialogs.
// Check with the ESM to see if we should process this one
if (!aPresContext->EventStateManager()->EventStatusOK(aMouseEvent)) {
return NS_OK;
}
const nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(
aMouseEvent, RelativeTo{this});
// When not using `alt`, and clicking on a draggable, but non-editable
// element, don't do anything, and let d&d handle the event.
//
//
// FIXME(emilio): The .Contains(pt) check looks a bit fishy. When would it be
// false given we're the event target? If it is needed, why not checking the
// actual draggable node rect instead?
if (!aMouseEvent->IsAlt() && GetRectRelativeToSelf().Contains(pt)) {
for (nsIContent* content = mContent; content;
content = content->GetFlattenedTreeParent()) {
if (nsContentUtils::ContentIsDraggable(content) &&
!content->IsEditable()) {
return NS_OK;
}
}
}
// If we are in Navigator and the click is in a draggable node, we don't want
// to start selection because we don't want to interfere with a potential
// drag of said node and steal all its glory.
const bool isEditor =
presShell->GetSelectionFlags() == nsISelectionDisplay::DISPLAY_ALL;
// Don't do something if it's middle button down event.
const bool isPrimaryButtonDown =
aMouseEvent->mButton == MouseButton::ePrimary;
// check whether style allows selection
// if not, don't tell selection the mouse event even occurred.
StyleUserSelect selectStyle;
// check for select: none
if (!IsSelectable(&selectStyle)) {
return NS_OK;
}
if (isPrimaryButtonDown) {
// If the mouse is dragged outside the nearest enclosing scrollable area
// while making a selection, the area will be scrolled. To do this, capture
// the mouse on the nearest scroll container frame. If there isn't a scroll
// container frame, or something else is already capturing the mouse,
// there's no reason to capture.
if (!PresShell::GetCapturingContent()) {
ScrollContainerFrame* scrollContainerFrame =
nsLayoutUtils::GetNearestScrollContainerFrame(
this, nsLayoutUtils::SCROLLABLE_SAME_DOC |
nsLayoutUtils::SCROLLABLE_INCLUDE_HIDDEN);
if (scrollContainerFrame) {
nsIFrame* capturingFrame = scrollContainerFrame;
PresShell::SetCapturingContent(capturingFrame->GetContent(),
CaptureFlags::IgnoreAllowedState);
}
}
}
// XXX This is screwy; it really should use the selection frame, not the
// event frame
const nsFrameSelection* frameselection =
selectStyle == StyleUserSelect::Text ? GetConstFrameSelection()
: presShell->ConstFrameSelection();
if (!frameselection || frameselection->GetDisplaySelection() ==
nsISelectionController::SELECTION_OFF) {
return NS_OK; // nothing to do we cannot affect selection from here
}
#ifdef XP_MACOSX
// If Control key is pressed on macOS, it should be treated as right click.
// So, don't change selection.
if (aMouseEvent->IsControl()) {
return NS_OK;
}
const bool control = aMouseEvent->IsMeta();
#else
const bool control = aMouseEvent->IsControl();
#endif
RefPtr<nsFrameSelection> fc = const_cast<nsFrameSelection*>(frameselection);
if (isPrimaryButtonDown && aMouseEvent->mClickCount > 1) {
// These methods aren't const but can't actually delete anything,
// so no need for AutoWeakFrame.
fc->SetDragState(true);
return HandleMultiplePress(aPresContext, aMouseEvent, aEventStatus,
control);
}
ContentOffsets offsets = GetContentOffsetsFromPoint(pt, SKIP_HIDDEN);
if (!offsets.content) {
return NS_ERROR_FAILURE;
}
const bool isSecondaryButton =
aMouseEvent->mButton == MouseButton::eSecondary;
if (isSecondaryButton &&
!MovingCaretToEventPointAllowedIfSecondaryButtonEvent(
*frameselection, *aMouseEvent, *offsets.content,
// When we collapse selection in nsFrameSelection::TakeFocus,
// we always collapse selection to the start offset. Therefore,
// we can ignore the end offset here. E.g., when an <img> is clicked,
// set the primary offset to after it, but the the secondary offset
// may be before it, see OffsetsForSingleFrame for the detail.
offsets.StartOffset())) {
return NS_OK;
}
if (aMouseEvent->mMessage == eMouseDown &&
aMouseEvent->mButton == MouseButton::eMiddle &&
!offsets.content->IsEditable()) {
// However, some users don't like the Chrome compatible behavior of
// middle mouse click. They want to keep selection after starting
// autoscroll. However, the selection change is important for middle
// mouse past. Therefore, we should allow users to take the traditional
// behavior back by themselves unless middle click paste is enabled or
// autoscrolling is disabled.
if (!Preferences::GetBool("middlemouse.paste", false) &&
Preferences::GetBool("general.autoScroll", false) &&
Preferences::GetBool("general.autoscroll.prevent_to_collapse_selection_"
"by_middle_mouse_down",
false)) {
return NS_OK;
}
}
if (isPrimaryButtonDown) {
// Let Ctrl/Cmd + left mouse down do table selection instead of drag
// initiation.
nsCOMPtr<nsIContent> parentContent;
int32_t contentOffset;
TableSelectionMode target;
nsresult rv = GetDataForTableSelection(
frameselection, presShell, aMouseEvent, getter_AddRefs(parentContent),
&contentOffset, &target);
if (NS_SUCCEEDED(rv) && parentContent) {
fc->SetDragState(true);
return fc->HandleTableSelection(parentContent, contentOffset, target,
aMouseEvent);
}
}
fc->SetDelayedCaretData(0);
if (isPrimaryButtonDown) {
// Check if any part of this frame is selected, and if the user clicked
// inside the selected region, and if it's the left button. If so, we delay
// starting a new selection since the user may be trying to drag the
// selected region to some other app.
if (GetContent() && GetContent()->IsMaybeSelected()) {
bool inSelection = false;
UniquePtr<SelectionDetails> details = frameselection->LookUpSelection(
offsets.content, 0, offsets.EndOffset(), false);
//
// If there are any details, check to see if the user clicked
// within any selected region of the frame.
//
for (SelectionDetails* curDetail = details.get(); curDetail;
curDetail = curDetail->mNext.get()) {
//
// If the user clicked inside a selection, then just
// return without doing anything. We will handle placing
// the caret later on when the mouse is released. We ignore
// the spellcheck, find and url formatting selections.
//
if (curDetail->mSelectionType != SelectionType::eSpellCheck &&
curDetail->mSelectionType != SelectionType::eFind &&
curDetail->mSelectionType != SelectionType::eURLSecondary &&
curDetail->mSelectionType != SelectionType::eURLStrikeout &&
curDetail->mSelectionType != SelectionType::eHighlight &&
curDetail->mSelectionType != SelectionType::eTargetText &&
curDetail->mStart <= offsets.StartOffset() &&
offsets.EndOffset() <= curDetail->mEnd) {
inSelection = true;
}
}
if (inSelection) {
fc->SetDragState(false);
fc->SetDelayedCaretData(aMouseEvent);
return NS_OK;
}
}
fc->SetDragState(true);
}
// Do not touch any nsFrame members after this point without adding
// weakFrame checks.
const nsFrameSelection::FocusMode focusMode = [&]() {
// If "Shift" and "Ctrl" are both pressed, "Shift" is given precedence. This
// mimics the old behaviour.
const bool isShift =
aMouseEvent->IsShift() &&
// If Shift + secondary button press shoud open context menu without a
// contextmenu event, user wants to open context menu like as a
// secondary button press without Shift key.
!(isSecondaryButton &&
StaticPrefs::dom_event_contextmenu_shift_suppresses_event());
if (isShift) {
// If clicked in a link when focused content is editable, we should
// collapse selection in the link for compatibility with Blink.
if (isEditor) {
for (Element* element : mContent->InclusiveAncestorsOfType<Element>()) {
if (element->IsLink()) {
return nsFrameSelection::FocusMode::kCollapseToNewPoint;
}
}
}
return nsFrameSelection::FocusMode::kExtendSelection;
}
if (isPrimaryButtonDown && control) {
return nsFrameSelection::FocusMode::kMultiRangeSelection;
}
return nsFrameSelection::FocusMode::kCollapseToNewPoint;
}();
nsresult rv = fc->HandleClick(
offsets.EndOffset(), focusMode, offsets.associate);
if (NS_FAILED(rv)) {
return rv;
}
// We don't handle mouse button up if it's middle button.
if (isPrimaryButtonDown && offsets.offset != offsets.secondaryOffset) {
fc->MaintainSelection();
}
if (isPrimaryButtonDown && isEditor && !aMouseEvent->IsShift() &&
(offsets.EndOffset() - offsets.StartOffset()) == 1) {
// A single node is selected and we aren't extending an existing selection,
// which means the user clicked directly on an object (either
// `user-select: all` or a non-text node without children). Therefore,
// disable selection extension during mouse moves.
// XXX This is a bit hacky; shouldn't editor be able to deal with this?
fc->SetDragState(false);
}
return NS_OK;
}
bool nsIFrame::MovingCaretToEventPointAllowedIfSecondaryButtonEvent(
const nsFrameSelection& aFrameSelection,
WidgetMouseEvent& aSecondaryButtonEvent,
const nsIContent& aContentAtEventPoint, int32_t aOffsetAtEventPoint) const {
MOZ_ASSERT(aSecondaryButtonEvent.mButton == MouseButton::eSecondary);
if (NS_WARN_IF(aOffsetAtEventPoint < 0)) {
return false;
}
const bool contentIsEditable = aContentAtEventPoint.IsEditable();
const TextControlElement* const contentAsTextControl =
TextControlElement::FromNodeOrNull(
aContentAtEventPoint.IsTextControlElement()
? &aContentAtEventPoint
: aContentAtEventPoint.GetClosestNativeAnonymousSubtreeRoot());
const Selection& selection = aFrameSelection.NormalSelection();
const bool selectionIsCollapsed =
selection.AreNormalAndCrossShadowBoundaryRangesCollapsed();
// If right click in a selection range, we should not collapse
// selection.
if (!selectionIsCollapsed && nsContentUtils::IsPointInSelection(
selection, aContentAtEventPoint,
static_cast<uint32_t>(aOffsetAtEventPoint),
true /* aAllowCrossShadowBoundary */)) {
return false;
}
const bool wantToPreventMoveCaret =
StaticPrefs::
ui_mouse_right_click_move_caret_stop_if_in_focused_editable_node() &&
selectionIsCollapsed && (contentIsEditable || contentAsTextControl);
const bool wantToPreventCollapseSelection =
StaticPrefs::
ui_mouse_right_click_collapse_selection_stop_if_non_collapsed_selection() &&
!selectionIsCollapsed;
if (wantToPreventMoveCaret || wantToPreventCollapseSelection) {
// If currently selection is limited in an editing host, we should not
// collapse selection nor move caret if the clicked point is in the
// ancestor limiter. Otherwise, this mouse click moves focus from the
// editing host to different one or blur the editing host. In this case,
// we need to update selection because keeping current selection in the
// editing host looks like it's not blurred.
// FIXME: If the active editing host is the document element, editor
// does not set ancestor limiter properly. Fix it in the editor side.
if (nsIContent* ancestorLimiter = selection.GetAncestorLimiter()) {
MOZ_ASSERT(ancestorLimiter->IsEditable());
return !aContentAtEventPoint.IsInclusiveDescendantOf(ancestorLimiter);
}
}
// If selection is editable and `stop_if_in_focused_editable_node` pref is
// set to true, user does not want to move caret to right click place if
// clicked in the focused text control element.
if (wantToPreventMoveCaret && contentAsTextControl &&
contentAsTextControl == nsFocusManager::GetFocusedElementStatic()) {
return false;
}
// If currently selection is not limited in an editing host, we should
// collapse selection only when this click moves focus to an editing
// host because we need to update selection in this case.
if (wantToPreventCollapseSelection && !contentIsEditable) {
return false;
}
return !StaticPrefs::
ui_mouse_right_click_collapse_selection_stop_if_non_editable_node() ||
// The user does not want to collapse selection into non-editable
// content by a right button click.
contentIsEditable ||
// Treat clicking in a text control as always clicked on editable
// content because we want a hack only for clicking in normal text
// nodes which is outside any editing hosts.
contentAsTextControl;
}
nsresult nsIFrame::SelectByTypeAtPoint(nsPresContext* aPresContext,
const nsPoint& aPoint,
nsSelectionAmount aBeginAmountType,
nsSelectionAmount aEndAmountType,
uint32_t aSelectFlags) {
NS_ENSURE_ARG_POINTER(aPresContext);
// No point in selecting if selection is turned off
if (DetermineDisplaySelection() == nsISelectionController::SELECTION_OFF) {
return NS_OK;
}
ContentOffsets offsets = GetContentOffsetsFromPoint(
aPoint, SKIP_HIDDEN | IGNORE_NATIVE_ANONYMOUS_SUBTREE);
if (!offsets.content) {
return NS_ERROR_FAILURE;
}
uint32_t offset;
nsIFrame* frame = SelectionMovementUtils::GetFrameForNodeOffset(
offsets.content, offsets.offset, offsets.associate, &offset);
if (!frame) {
return NS_ERROR_FAILURE;
}
return frame->PeekBackwardAndForward(
aBeginAmountType, aEndAmountType, static_cast<int32_t>(offset),
aBeginAmountType != eSelectWord, aSelectFlags);
}
/**
* Multiple Mouse Press -- line or paragraph selection -- for the frame.
* Wouldn't it be nice if this didn't have to be hardwired into Frame code?
*/
NS_IMETHODIMP
nsIFrame::HandleMultiplePress(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus, bool aControlHeld) {
NS_ENSURE_ARG_POINTER(aEvent);
NS_ENSURE_ARG_POINTER(aEventStatus);
if (nsEventStatus_eConsumeNoDefault == *aEventStatus ||
DetermineDisplaySelection() == nsISelectionController::SELECTION_OFF) {
return NS_OK;
}
// Find out whether we're doing line or paragraph selection.
// If browser.triple_click_selects_paragraph is true, triple-click selects
// paragraph. Otherwise, triple-click selects line, and quadruple-click
// selects paragraph (on platforms that support quadruple-click).
nsSelectionAmount beginAmount, endAmount;
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (!mouseEvent) {
return NS_OK;
}
if (mouseEvent->mClickCount == 4) {
beginAmount = endAmount = eSelectParagraph;
} else if (mouseEvent->mClickCount == 3) {
if (Preferences::GetBool("browser.triple_click_selects_paragraph")) {
beginAmount = endAmount = eSelectParagraph;
} else {
beginAmount = eSelectBeginLine;
endAmount = eSelectEndLine;
}
} else if (mouseEvent->mClickCount == 2) {
// We only want inline frames; PeekBackwardAndForward dislikes blocks
beginAmount = endAmount = eSelectWord;
} else {
return NS_OK;
}
nsPoint relPoint = nsLayoutUtils::GetEventCoordinatesRelativeTo(
mouseEvent, RelativeTo{this});
return SelectByTypeAtPoint(aPresContext, relPoint, beginAmount, endAmount,
(aControlHeld ? SELECT_ACCUMULATE : 0));
}
nsresult nsIFrame::PeekBackwardAndForward(nsSelectionAmount aAmountBack,
nsSelectionAmount aAmountForward,
int32_t aStartPos, bool aJumpLines,
uint32_t aSelectFlags) {
nsIFrame* baseFrame = this;
int32_t baseOffset = aStartPos;
nsresult rv;
PeekOffsetOptions peekOffsetOptions{PeekOffsetOption::StopAtScroller};
if (aJumpLines) {
peekOffsetOptions += PeekOffsetOption::JumpLines;
}
if (aAmountBack == eSelectWord) {
// To avoid selecting the previous word when at start of word,
// first move one character forward.
PeekOffsetStruct pos(eSelectCharacter, eDirNext, aStartPos, nsPoint(0, 0),
peekOffsetOptions);
rv = PeekOffset(&pos);
if (NS_SUCCEEDED(rv)) {
baseFrame = pos.mResultFrame;
baseOffset = pos.mContentOffset;
}
}
// Search backward for a boundary.
PeekOffsetStruct startpos(aAmountBack, eDirPrevious, baseOffset,
nsPoint(0, 0), peekOffsetOptions);
rv = baseFrame->PeekOffset(&startpos);
if (NS_FAILED(rv)) {
return rv;
}
// If the backward search stayed within the same frame, search forward from
// that position for the end boundary; but if it crossed out to a sibling or
// ancestor, start from the original position.
if (startpos.mResultFrame == baseFrame) {
baseOffset = startpos.mContentOffset;
} else {
baseFrame = this;
baseOffset = aStartPos;
}
PeekOffsetStruct endpos(aAmountForward, eDirNext, baseOffset, nsPoint(0, 0),
peekOffsetOptions);
rv = baseFrame->PeekOffset(&endpos);
if (NS_FAILED(rv)) {
return rv;
}
// Keep frameSelection alive.
RefPtr<nsFrameSelection> frameSelection = GetFrameSelection();
const nsFrameSelection::FocusMode focusMode =
(aSelectFlags & SELECT_ACCUMULATE)
? nsFrameSelection::FocusMode::kMultiRangeSelection
: nsFrameSelection::FocusMode::kCollapseToNewPoint;
rv = frameSelection->HandleClick(
startpos.mContentOffset, startpos.mContentOffset, focusMode,
CaretAssociationHint::After);
if (NS_FAILED(rv)) {
return rv;
}
rv = frameSelection->HandleClick(
endpos.mContentOffset, endpos.mContentOffset,
nsFrameSelection::FocusMode::kExtendSelection,
CaretAssociationHint::Before);
if (NS_FAILED(rv)) {
return rv;
}
if (aAmountBack == eSelectWord) {
frameSelection->SetClickSelectionType(ClickSelectionType::Double);
} else if (aAmountBack == eSelectParagraph) {
frameSelection->SetClickSelectionType(ClickSelectionType::Triple);
}
// maintain selection
return frameSelection->MaintainSelection(aAmountBack);
}
NS_IMETHODIMP nsIFrame::HandleDrag(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
MOZ_ASSERT(aEvent->mClass == eMouseEventClass,
"HandleDrag can only handle mouse event");
NS_ENSURE_ARG_POINTER(aEventStatus);
RefPtr<nsFrameSelection> frameselection = GetFrameSelection();
if (!frameselection) {
return NS_OK;
}
bool mouseDown = frameselection->GetDragState();
if (!mouseDown) {
return NS_OK;
}
nsIFrame* scrollbar =
nsLayoutUtils::GetClosestFrameOfType(this, LayoutFrameType::Scrollbar);
if (!scrollbar) {
// XXX Do we really need to exclude non-selectable content here?
// GetContentOffsetsFromPoint can handle it just fine, although some
// other stuff might not like it.
// NOTE: DetermineDisplaySelection() returns SELECTION_OFF for
// non-selectable frames.
if (DetermineDisplaySelection() == nsISelectionController::SELECTION_OFF) {
return NS_OK;
}
}
frameselection->StopAutoScrollTimer();
// Check if we are dragging in a table cell
nsCOMPtr<nsIContent> parentContent;
int32_t contentOffset;
TableSelectionMode target;
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
mozilla::PresShell* presShell = aPresContext->PresShell();
nsresult result;
result = GetDataForTableSelection(frameselection, presShell, mouseEvent,
getter_AddRefs(parentContent),
&contentOffset, &target);
AutoWeakFrame weakThis = this;
if (NS_SUCCEEDED(result) && parentContent) {
result = frameselection->HandleTableSelection(parentContent, contentOffset,
target, mouseEvent);
if (NS_WARN_IF(NS_FAILED(result))) {
return result;
}
} else {
nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(mouseEvent,
RelativeTo{this});
frameselection->HandleDrag(this, pt);
}
// The frameselection object notifies selection listeners synchronously above
// which might have killed us.
if (!weakThis.IsAlive()) {
return NS_OK;
}
// Get the nearest scroll container frame.
ScrollContainerFrame* scrollContainerFrame =
nsLayoutUtils::GetNearestScrollContainerFrame(
this, nsLayoutUtils::SCROLLABLE_SAME_DOC |
nsLayoutUtils::SCROLLABLE_INCLUDE_HIDDEN);
if (scrollContainerFrame) {
nsIFrame* capturingFrame = scrollContainerFrame->GetScrolledFrame();
if (capturingFrame) {
nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(
mouseEvent, RelativeTo{capturingFrame});
frameselection->StartAutoScrollTimer(capturingFrame, pt, 30);
}
}
return NS_OK;
}
/**
* This static method handles part of the nsIFrame::HandleRelease in a way
* which doesn't rely on the nsFrame object to stay alive.
*/
MOZ_CAN_RUN_SCRIPT_BOUNDARY static nsresult HandleFrameSelection(
nsFrameSelection* aFrameSelection, nsIFrame::ContentOffsets& aOffsets,
bool aHandleTableSel, int32_t aContentOffsetForTableSel,
TableSelectionMode aTargetForTableSel,
nsIContent* aParentContentForTableSel, WidgetGUIEvent* aEvent,
const nsEventStatus* aEventStatus) {
if (!aFrameSelection) {
return NS_OK;
}
nsresult rv = NS_OK;
if (nsEventStatus_eConsumeNoDefault != *aEventStatus) {
if (!aHandleTableSel) {
if (!aOffsets.content || !aFrameSelection->HasDelayedCaretData()) {
return NS_ERROR_FAILURE;
}
// We are doing this to simulate what we would have done on HandlePress.
// We didn't do it there to give the user an opportunity to drag
// the text, but since they didn't drag, we want to place the
// caret.
// However, we'll use the mouse position from the release, since:
// * it's easier
// * that's the normal click position to use (although really, in
// the normal case, small movements that don't count as a drag
// can do selection)
aFrameSelection->SetDragState(true);
const nsFrameSelection::FocusMode focusMode =
aFrameSelection->IsShiftDownInDelayedCaretData()
? nsFrameSelection::FocusMode::kExtendSelection
: nsFrameSelection::FocusMode::kCollapseToNewPoint;
rv = aFrameSelection->HandleClick(
aOffsets.StartOffset(), aOffsets.EndOffset(), focusMode,
aOffsets.associate);
if (NS_FAILED(rv)) {
return rv;
}
} else if (aParentContentForTableSel) {
aFrameSelection->SetDragState(false);
rv = aFrameSelection->HandleTableSelection(
aParentContentForTableSel, aContentOffsetForTableSel,
aTargetForTableSel, aEvent->AsMouseEvent());
if (NS_FAILED(rv)) {
return rv;
}
}
aFrameSelection->SetDelayedCaretData(0);
}
aFrameSelection->SetDragState(false);
aFrameSelection->StopAutoScrollTimer();
return NS_OK;
}
NS_IMETHODIMP nsIFrame::HandleRelease(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
if (aEvent->mClass != eMouseEventClass) {
return NS_OK;
}
nsIFrame* activeFrame = GetActiveSelectionFrame(aPresContext, this);
nsCOMPtr<nsIContent> captureContent = PresShell::GetCapturingContent();
bool selectionOff =
(DetermineDisplaySelection() == nsISelectionController::SELECTION_OFF);
RefPtr<nsFrameSelection> frameselection;
ContentOffsets offsets;
nsCOMPtr<nsIContent> parentContent;
int32_t contentOffsetForTableSel = 0;
TableSelectionMode targetForTableSel = TableSelectionMode::None;
bool handleTableSelection = true;
if (!selectionOff) {
frameselection = GetFrameSelection();
if (nsEventStatus_eConsumeNoDefault != *aEventStatus && frameselection) {
// Check if the frameselection recorded the mouse going down.
// If not, the user must have clicked in a part of the selection.
// Place the caret before continuing!
if (frameselection->MouseDownRecorded()) {
nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(
aEvent, RelativeTo{this});
offsets = GetContentOffsetsFromPoint(pt, SKIP_HIDDEN);
handleTableSelection = false;
} else {
GetDataForTableSelection(frameselection, PresShell(),
aEvent->AsMouseEvent(),
getter_AddRefs(parentContent),
&contentOffsetForTableSel, &targetForTableSel);
}
}
}
// We might be capturing in some other document and the event just happened to
// trickle down here. Make sure that document's frame selection is notified.
RefPtr<nsFrameSelection> frameSelection;
if (activeFrame != this && activeFrame->DetermineDisplaySelection() !=
nsISelectionController::SELECTION_OFF) {
frameSelection = activeFrame->GetFrameSelection();
}
// Also check the selection of the capturing content which might be in a
// different document.
if (!frameSelection && captureContent) {
if (Document* doc = captureContent->GetComposedDoc()) {
mozilla::PresShell* capturingPresShell = doc->GetPresShell();
if (capturingPresShell &&
capturingPresShell != PresContext()->GetPresShell()) {
frameSelection = capturingPresShell->FrameSelection();
}
}
}
if (frameSelection) {
AutoWeakFrame wf(this);
frameSelection->SetDragState(false);
frameSelection->StopAutoScrollTimer();
if (wf.IsAlive()) {
ScrollContainerFrame* scrollContainerFrame =
nsLayoutUtils::GetNearestScrollContainerFrame(
this, nsLayoutUtils::SCROLLABLE_SAME_DOC |
nsLayoutUtils::SCROLLABLE_INCLUDE_HIDDEN);
if (scrollContainerFrame) {
// Perform any additional scrolling needed to maintain CSS snap point
// requirements when autoscrolling is over.
scrollContainerFrame->ScrollSnap();
}
}
}
// Do not call any methods of the current object after this point!!!
// The object is perhaps dead!
return selectionOff ? NS_OK
: HandleFrameSelection(
frameselection, offsets, handleTableSelection,
contentOffsetForTableSel, targetForTableSel,
parentContent, aEvent, aEventStatus);
}
struct MOZ_STACK_CLASS FrameContentRange {
FrameContentRange(nsIContent* aContent, int32_t aStart, int32_t aEnd)
: content(aContent), start(aStart), end(aEnd) {}
nsCOMPtr<nsIContent> content;
int32_t start;
int32_t end;
};
// Retrieve the content offsets of a frame
static FrameContentRange GetRangeForFrame(const nsIFrame* aFrame) {
nsIContent* content = aFrame->GetContent();
if (!content) {
NS_WARNING("Frame has no content");
return FrameContentRange(nullptr, -1, -1);
}
LayoutFrameType type = aFrame->Type();
if (type == LayoutFrameType::Text) {
auto [offset, offsetEnd] = aFrame->GetOffsets();
return FrameContentRange(content, offset, offsetEnd);
}
if (type == LayoutFrameType::Br) {
nsIContent* parent = content->GetParent();
const int32_t beginOffset = parent->ComputeIndexOf_Deprecated(content);
return FrameContentRange(parent, beginOffset, beginOffset);
}
while (content->IsRootOfNativeAnonymousSubtree()) {
content = content->GetParent();
}
MOZ_ASSERT(!content->IsBeingRemoved());
nsIContent* parent = content->GetParent();
if (aFrame->IsBlockOutside() || !parent) {
return FrameContentRange(content, 0, content->GetChildCount());
}
// TODO(emilio): Revise this in presence of Shadow DOM / display: contents,
// it's likely that we don't want to just walk the light tree, and we need to
// change the representation of FrameContentRange.
Maybe<uint32_t> index = parent->ComputeIndexOf(content);
MOZ_ASSERT(index.isSome());
return FrameContentRange(parent, static_cast<int32_t>(*index),
static_cast<int32_t>(*index + 1));
}
// The FrameTarget represents the closest frame to a point that can be selected
// The frame is the frame represented, frameEdge says whether one end of the
// frame is the result (in which case different handling is needed), and
// afterFrame says which end is represented if frameEdge is true
struct FrameTarget {
explicit operator bool() const { return !!frame; }
nsIFrame* frame = nullptr;
bool frameEdge = false;
bool afterFrame = false;
};
// See function implementation for information
static FrameTarget GetSelectionClosestFrame(nsIFrame* aFrame,
const nsPoint& aPoint,
uint32_t aFlags);
static bool SelfIsSelectable(nsIFrame* aFrame, nsIFrame* aParentFrame,
uint32_t aFlags) {
// We should not move selection into a native anonymous subtree when handling
// selection outside it.
if ((aFlags & nsIFrame::IGNORE_NATIVE_ANONYMOUS_SUBTREE) &&
aParentFrame->GetClosestNativeAnonymousSubtreeRoot() !=
aFrame->GetClosestNativeAnonymousSubtreeRoot()) {
return false;
}
if ((aFlags & nsIFrame::SKIP_HIDDEN) &&
!aFrame->StyleVisibility()->IsVisible()) {
return false;
}
if (aFrame->IsGeneratedContentFrame()) {
return false;
}
if (aFrame->Style()->UserSelect() == StyleUserSelect::None) {
return false;
}
if (aFrame->IsEmpty() &&
(!aFrame->IsTextFrame() || !aFrame->ContentIsEditable())) {
// FIXME(emilio): Historically we haven't treated empty frames as
// selectable, but also we had special-cases so that editable empty text
// frames returned false from IsEmpty(). Sort this out (probably by
// removing the IsEmpty() condition altogether).
return false;
}
return true;
}
static bool FrameContentCanHaveParentSelectionRange(nsIFrame* aFrame) {
// If we are only near (not directly over) then don't traverse
// frames with independent selection (e.g. text and list controls, see bug
// 268497). Note that this prevents any of the users of this method from
// entering form controls.
// XXX We might want some way to allow using the up-arrow to go into a form
// control, but the focus didn't work right anyway; it'd probably be enough
// if the left and right arrows could enter textboxes (which I don't believe
// they can at the moment)
if (aFrame->IsTextInputFrame() || aFrame->IsListControlFrame()) {
MOZ_ASSERT(aFrame->HasAnyStateBits(NS_FRAME_INDEPENDENT_SELECTION));
return false;
}
// Failure in this assertion means a new type of frame forms the root of an
// NS_FRAME_INDEPENDENT_SELECTION subtree. In such case, the condition above
// should be changed to handle it.
MOZ_ASSERT_IF(
aFrame->HasAnyStateBits(NS_FRAME_INDEPENDENT_SELECTION),
aFrame->GetParent()->HasAnyStateBits(NS_FRAME_INDEPENDENT_SELECTION));
return !aFrame->IsGeneratedContentFrame();
}
static bool SelectionDescendToKids(nsIFrame* aFrame) {
if (!FrameContentCanHaveParentSelectionRange(aFrame)) {
return false;
}
auto style = aFrame->Style()->UserSelect();
return style != StyleUserSelect::All && style != StyleUserSelect::None;
}
static FrameTarget GetSelectionClosestFrameForChild(nsIFrame* aChild,
const nsPoint& aPoint,
uint32_t aFlags) {
nsIFrame* parent = aChild->GetParent();
if (SelectionDescendToKids(aChild)) {
nsPoint pt = aPoint - aChild->GetOffsetTo(parent);
return GetSelectionClosestFrame(aChild, pt, aFlags);
}
return FrameTarget{aChild, false, false};
}
// When the cursor needs to be at the beginning of a block, it shouldn't be
// before the first child. A click on a block whose first child is a block
// should put the cursor in the child. The cursor shouldn't be between the
// blocks, because that's not where it's expected.
// Note that this method is guaranteed to succeed.
static FrameTarget DrillDownToSelectionFrame(nsIFrame* aFrame, bool aEndFrame,
uint32_t aFlags) {
if (SelectionDescendToKids(aFrame)) {
nsIFrame* result = nullptr;
nsIFrame* frame = aFrame->PrincipalChildList().FirstChild();
if (!aEndFrame) {
while (frame && !SelfIsSelectable(frame, aFrame, aFlags)) {
frame = frame->GetNextSibling();
}
if (frame) {
result = frame;
}
} else {
// Because the frame tree is singly linked, to find the last frame,
// we have to iterate through all the frames
// XXX I have a feeling this could be slow for long blocks, although
// I can't find any slowdowns
while (frame) {
if (SelfIsSelectable(frame, aFrame, aFlags)) {
result = frame;
}
frame = frame->GetNextSibling();
}
}
if (result) {
return DrillDownToSelectionFrame(result, aEndFrame, aFlags);
}
}
// If the current frame has no targetable children, target the current frame
return FrameTarget{aFrame, true, aEndFrame};
}
// This method finds the closest valid FrameTarget on a given line; if there is
// no valid FrameTarget on the line, it returns a null FrameTarget
static FrameTarget GetSelectionClosestFrameForLine(
nsBlockFrame* aParent, nsBlockFrame::LineIterator aLine,
const nsPoint& aPoint, uint32_t aFlags) {
// Account for end of lines (any iterator from the block is valid)
if (aLine == aParent->LinesEnd()) {
return DrillDownToSelectionFrame(aParent, true, aFlags);
}
nsIFrame* frame = aLine->mFirstChild;
nsIFrame* closestFromIStart = nullptr;
nsIFrame* closestFromIEnd = nullptr;
nscoord closestIStart = aLine->IStart(), closestIEnd = aLine->IEnd();
WritingMode wm = aLine->mWritingMode;
LogicalPoint pt(wm, aPoint, aLine->mContainerSize);
bool canSkipBr = false;
bool lastFrameWasEditable = false;
for (int32_t n = aLine->GetChildCount(); n;
--n, frame = frame->GetNextSibling()) {
// Skip brFrames. Can only skip if the line contains at least
// one selectable and non-empty frame before. Also, avoid skipping brs if
// the previous thing had a different editableness than us, since then we
// may end up not being able to select after it if the br is the last thing
// on the line.
if (!SelfIsSelectable(frame, aParent, aFlags) ||
(canSkipBr && frame->IsBrFrame() &&
lastFrameWasEditable == frame->GetContent()->IsEditable())) {
continue;
}
canSkipBr = true;
lastFrameWasEditable =
frame->GetContent() && frame->GetContent()->IsEditable();
LogicalRect frameRect =
LogicalRect(wm, frame->GetRect(), aLine->mContainerSize);
if (pt.I(wm) >= frameRect.IStart(wm)) {
if (pt.I(wm) < frameRect.IEnd(wm)) {
return GetSelectionClosestFrameForChild(frame, aPoint, aFlags);
}
if (frameRect.IEnd(wm) >= closestIStart) {
closestFromIStart = frame;
closestIStart = frameRect.IEnd(wm);
}
} else {
if (frameRect.IStart(wm) <= closestIEnd) {
closestFromIEnd = frame;
closestIEnd = frameRect.IStart(wm);
}
}
}
if (!closestFromIStart && !closestFromIEnd) {
// We should only get here if there are no selectable frames on a line
// XXX Do we need more elaborate handling here?
return FrameTarget();
}
if (closestFromIStart &&
(!closestFromIEnd ||
(abs(pt.I(wm) - closestIStart) <= abs(pt.I(wm) - closestIEnd)))) {
return GetSelectionClosestFrameForChild(closestFromIStart, aPoint, aFlags);
}
return GetSelectionClosestFrameForChild(closestFromIEnd, aPoint, aFlags);
}
// This method is for the special handling we do for block frames; they're
// special because they represent paragraphs and because they are organized
// into lines, which have bounds that are not stored elsewhere in the
// frame tree. Returns a null FrameTarget for frames which are not
// blocks or blocks with no lines except editable one.
static FrameTarget GetSelectionClosestFrameForBlock(nsIFrame* aFrame,
const nsPoint& aPoint,
uint32_t aFlags) {
nsBlockFrame* bf = do_QueryFrame(aFrame);
if (!bf) {
return FrameTarget();
}
// This code searches for the correct line
nsBlockFrame::LineIterator end = bf->LinesEnd();
nsBlockFrame::LineIterator curLine = bf->LinesBegin();
nsBlockFrame::LineIterator closestLine = end;
if (curLine != end) {
// Convert aPoint into a LogicalPoint in the writing-mode of this block
WritingMode wm = curLine->mWritingMode;
LogicalPoint pt(wm, aPoint, curLine->mContainerSize);
do {
// Check to see if our point lies within the line's block-direction bounds
nscoord BCoord = pt.B(wm) - curLine->BStart();
nscoord BSize = curLine->BSize();
if (BCoord >= 0 && BCoord < BSize) {
closestLine = curLine;
break; // We found the line; stop looking
}
if (BCoord < 0) {
break;
}
++curLine;
} while (curLine != end);
if (closestLine == end) {
nsBlockFrame::LineIterator prevLine = curLine.prev();
nsBlockFrame::LineIterator nextLine = curLine;
// Avoid empty lines
while (nextLine != end && nextLine->IsEmpty()) {
++nextLine;
}
while (prevLine != end && prevLine->IsEmpty()) {
--prevLine;
}
// This hidden pref dictates whether a point above or below all lines
// comes up with a line or the beginning or end of the frame; 0 on
// Windows, 1 on other platforms by default at the writing of this code
int32_t dragOutOfFrame =
Preferences::GetInt("browser.drag_out_of_frame_style");
if (prevLine == end) {
if (dragOutOfFrame == 1 || nextLine == end) {
return DrillDownToSelectionFrame(aFrame, false, aFlags);
}
closestLine = nextLine;
} else if (nextLine == end) {
if (dragOutOfFrame == 1) {
return DrillDownToSelectionFrame(aFrame, true, aFlags);
}
closestLine = prevLine;
} else { // Figure out which line is closer
if (pt.B(wm) - prevLine->BEnd() < nextLine->BStart() - pt.B(wm)) {
closestLine = prevLine;
} else {
closestLine = nextLine;
}
}
}
}
do {
if (auto target =
GetSelectionClosestFrameForLine(bf, closestLine, aPoint, aFlags)) {
return target;
}
++closestLine;
} while (closestLine != end);
// Fall back to just targeting the last targetable place
return DrillDownToSelectionFrame(aFrame, true, aFlags);
}
// Use frame edge for grid, flex, table, and non-editable images. Choose the
// edge based on the point position past the frame rect. If past the middle,
// caret should be at end, otherwise at start. This behavior matches Blink.
//
// TODO(emilio): Can we use this code path for other replaced elements other
// than images? Or even all other frames? We only get there when we didn't find
// selectable children... At least one XUL test fails if we make this apply to
// XUL labels. Also, editable images need _not_ to use the frame edge, see
// below.
static bool UseFrameEdge(nsIFrame* aFrame) {
if (aFrame->IsFlexOrGridContainer() || aFrame->IsTableFrame()) {
return true;
}
const nsImageFrame* image = do_QueryFrame(aFrame);
if (image && !aFrame->GetContent()->IsEditable()) {
// Editable images are a special-case because editing relies on clicking on
// an editable image selecting it, for it to show resizers.
return true;
}
return false;
}
static FrameTarget LastResortFrameTargetForFrame(nsIFrame* aFrame,
const nsPoint& aPoint) {
if (!UseFrameEdge(aFrame)) {
return {aFrame, false, false};
}
const auto& rect = aFrame->GetRectRelativeToSelf();
nscoord reference;
nscoord middle;
if (aFrame->GetWritingMode().IsVertical()) {
reference = aPoint.y;
middle = rect.Height() / 2;
} else {
reference = aPoint.x;
middle = rect.Width() / 2;
}
const bool afterFrame = reference > middle;
return {aFrame, true, afterFrame};
}
// GetSelectionClosestFrame is the helper function that calculates the closest
// frame to the given point.
// It doesn't completely account for offset styles, so needs to be used in
// restricted environments.
// Cannot handle overlapping frames correctly, so it should receive the output
// of GetFrameForPoint
// Guaranteed to return a valid FrameTarget.
// aPoint is relative to aFrame.
static FrameTarget GetSelectionClosestFrame(nsIFrame* aFrame,
const nsPoint& aPoint,
uint32_t aFlags) {
// Handle blocks; if the frame isn't a block, the method fails
if (auto target = GetSelectionClosestFrameForBlock(aFrame, aPoint, aFlags)) {
return target;
}
if (aFlags & nsIFrame::IGNORE_NATIVE_ANONYMOUS_SUBTREE &&
!FrameContentCanHaveParentSelectionRange(aFrame)) {
return LastResortFrameTargetForFrame(aFrame, aPoint);
}
if (nsIFrame* kid = aFrame->PrincipalChildList().FirstChild()) {
// Go through all the child frames to find the closest one
nsIFrame::FrameWithDistance closest = {nullptr, nscoord_MAX, nscoord_MAX};
for (; kid; kid = kid->GetNextSibling()) {
if (!SelfIsSelectable(kid, aFrame, aFlags)) {
continue;
}
kid->FindCloserFrameForSelection(aPoint, &closest);
}
if (closest.mFrame) {
if (closest.mFrame->IsInSVGTextSubtree()) {
return FrameTarget{closest.mFrame, false, false};
}
return GetSelectionClosestFrameForChild(closest.mFrame, aPoint, aFlags);
}
}
return LastResortFrameTargetForFrame(aFrame, aPoint);
}
static nsIFrame::ContentOffsets OffsetsForSingleFrame(nsIFrame* aFrame,
const nsPoint& aPoint) {
nsIFrame::ContentOffsets offsets;
FrameContentRange range = GetRangeForFrame(aFrame);
offsets.content = range.content;
// If there are continuations (meaning it's not one rectangle), this is the
// best this function can do
if (aFrame->GetNextContinuation() || aFrame->GetPrevContinuation()) {
offsets.offset = range.start;
offsets.secondaryOffset = range.end;
offsets.associate = CaretAssociationHint::After;
return offsets;
}
// Figure out whether the offsets should be over, after, or before the frame
nsRect rect(nsPoint(0, 0), aFrame->GetSize());
bool isBlock = !aFrame->StyleDisplay()->IsInlineFlow();
bool isRtl = (aFrame->StyleVisibility()->mDirection == StyleDirection::Rtl);
if ((isBlock && rect.y < aPoint.y) ||
(!isBlock && ((isRtl && rect.x + rect.width / 2 > aPoint.x) ||
(!isRtl && rect.x + rect.width / 2 < aPoint.x)))) {
offsets.offset = range.end;
if (rect.Contains(aPoint)) {
offsets.secondaryOffset = range.start;
} else {
offsets.secondaryOffset = range.end;
}
} else {
offsets.offset = range.start;
if (rect.Contains(aPoint)) {
offsets.secondaryOffset = range.end;
} else {
offsets.secondaryOffset = range.start;
}
}
offsets.associate = offsets.offset == range.start
? CaretAssociationHint::After
: CaretAssociationHint::Before;
return offsets;
}
static nsIFrame* AdjustFrameForSelectionStyles(nsIFrame* aFrame) {
nsIFrame* adjustedFrame = aFrame;
for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) {
// These are the conditions that make all children not able to handle
// a cursor.
auto userSelect = frame->Style()->UserSelect();
if (userSelect != StyleUserSelect::Auto &&
userSelect != StyleUserSelect::All) {
break;
}
if (userSelect == StyleUserSelect::All ||
frame->IsGeneratedContentFrame()) {
adjustedFrame = frame;
}
}
return adjustedFrame;
}
nsIFrame::ContentOffsets nsIFrame::GetContentOffsetsFromPoint(
const nsPoint& aPoint, uint32_t aFlags) {
nsIFrame* adjustedFrame;
if (aFlags & IGNORE_SELECTION_STYLE) {
adjustedFrame = this;
} else {
// This section of code deals with special selection styles. Note that
// -moz-all exists, even though it doesn't need to be explicitly handled.
//
// The offset is forced not to end up in generated content; content offsets
// cannot represent content outside of the document's content tree.
adjustedFrame = AdjustFrameForSelectionStyles(this);
// `user-select: all` needs special handling, because clicking on it should
// lead to the whole frame being selected.
if (adjustedFrame->Style()->UserSelect() == StyleUserSelect::All) {
nsPoint adjustedPoint = aPoint + GetOffsetTo(adjustedFrame);
return OffsetsForSingleFrame(adjustedFrame, adjustedPoint);
}
// For other cases, try to find a closest frame starting from the parent of
// the unselectable frame
if (adjustedFrame != this) {
adjustedFrame = adjustedFrame->GetParent();
}
}
nsPoint adjustedPoint = aPoint + GetOffsetTo(adjustedFrame);
FrameTarget closest =
GetSelectionClosestFrame(adjustedFrame, adjustedPoint, aFlags);
// If the correct offset is at one end of a frame, use offset-based
// calculation method
if (closest.frameEdge) {
ContentOffsets offsets;
FrameContentRange range = GetRangeForFrame(closest.frame);
offsets.content = range.content;
if (closest.afterFrame) {
offsets.offset = range.end;
} else {
offsets.offset = range.start;
}
offsets.secondaryOffset = offsets.offset;
offsets.associate = offsets.offset == range.start
? CaretAssociationHint::After
: CaretAssociationHint::Before;
return offsets;
}
nsPoint pt;
if (closest.frame != this) {
if (closest.frame->IsInSVGTextSubtree()) {
pt = nsLayoutUtils::TransformAncestorPointToFrame(
RelativeTo{closest.frame}, aPoint, RelativeTo{this});
} else {
pt = aPoint - closest.frame->GetOffsetTo(this);
}
} else {
pt = aPoint;
}
return closest.frame->CalcContentOffsetsFromFramePoint(pt);
// XXX should I add some kind of offset standardization?
// consider <b>xxxxx</b><i>zzzzz</i>; should any click between the last
// x and first z put the cursor in the same logical position in addition
// to the same visual position?
}
nsIFrame::ContentOffsets nsIFrame::CalcContentOffsetsFromFramePoint(
const nsPoint& aPoint) {
return OffsetsForSingleFrame(this, aPoint);
}
bool nsIFrame::AssociateImage(const StyleImage& aImage) {
imgRequestProxy* req = aImage.GetImageRequest();
if (!req) {
return false;
}
mozilla::css::ImageLoader* loader =
PresContext()->Document()->StyleImageLoader();
loader->AssociateRequestToFrame(req, this);
return true;
}
void nsIFrame::DisassociateImage(const StyleImage& aImage) {
imgRequestProxy* req = aImage.GetImageRequest();
if (!req) {
return;
}
mozilla::css::ImageLoader* loader =
PresContext()->Document()->StyleImageLoader();
loader->DisassociateRequestFromFrame(req, this);
}
StyleImageRendering nsIFrame::UsedImageRendering() const {
ComputedStyle* style;
if (IsCanvasFrame()) {
// XXXdholbert Maybe we should use FindCanvasBackground here (instead of
// FindBackground), since we're inside an IsCanvasFrame check? Though then
// we'd also have to copypaste or abstract-away the multi-part root-frame
// lookup that the canvas-flavored API requires.
style = nsCSSRendering::FindBackground(this);
} else {
style = Style();
}
return style->StyleVisibility()->mImageRendering;
}
// The touch-action CSS property applies to: all elements except: non-replaced
// inline elements, table rows, row groups, table columns, and column groups.
StyleTouchAction nsIFrame::UsedTouchAction() const {
if (IsLineParticipant()) {
return StyleTouchAction::AUTO;
}
auto& disp = *StyleDisplay();
if (disp.IsInternalTableStyleExceptCell()) {
return StyleTouchAction::AUTO;
}
return disp.mTouchAction;
}
nsIFrame::Cursor nsIFrame::GetCursor(const nsPoint&) {
StyleCursorKind kind = StyleUI()->Cursor().keyword;
if (kind == StyleCursorKind::Auto) {
// If this is editable, I-beam cursor is better for most elements.
kind = (mContent && mContent->IsEditable()) ? StyleCursorKind::Text
: StyleCursorKind::Default;
}
if (kind == StyleCursorKind::Text && GetWritingMode().IsVertical()) {
// Per CSS UI spec, UA may treat value 'text' as
// 'vertical-text' for vertical text.
kind = StyleCursorKind::VerticalText;
}
return Cursor{kind, AllowCustomCursorImage::Yes};
}
// Resize and incremental reflow
/* virtual */
void nsIFrame::MarkIntrinsicISizesDirty() {
// If we're a flex item, clear our flex-item-specific cached measurements
// (which likely depended on our now-stale intrinsic isize).
if (IsFlexItem()) {
nsFlexContainerFrame::MarkCachedFlexMeasurementsDirty(this);
}
if (HasAnyStateBits(NS_FRAME_FONT_INFLATION_FLOW_ROOT)) {
nsFontInflationData::MarkFontInflationDataTextDirty(this);
}
RemoveProperty(nsGridContainerFrame::CachedBAxisMeasurement::Prop());
}
void nsIFrame::MarkSubtreeDirty() {
if (HasAnyStateBits(NS_FRAME_IS_DIRTY)) {
return;
}
// Unconditionally mark given frame dirty.
AddStateBits(NS_FRAME_IS_DIRTY);
// Mark all descendants dirty, unless:
// - Already dirty.
// - TableColGroup
AutoTArray<nsIFrame*, 32> stack;
for (const auto& childLists : ChildLists()) {
for (nsIFrame* kid : childLists.mList) {
stack.AppendElement(kid);
}
}
while (!stack.IsEmpty()) {
nsIFrame* f = stack.PopLastElement();
if (f->HasAnyStateBits(NS_FRAME_IS_DIRTY) || f->IsTableColGroupFrame()) {
continue;
}
f->AddStateBits(NS_FRAME_IS_DIRTY);
for (const auto& childLists : f->ChildLists()) {
for (nsIFrame* kid : childLists.mList) {
stack.AppendElement(kid);
}
}
}
}
/* virtual */
void nsIFrame::AddInlineMinISize(const IntrinsicSizeInput& aInput,
InlineMinISizeData* aData) {
// Note: we are one of the children that mPercentageBasisForChildren was
// prepared for (i.e. our parent frame prepares the percentage basis for us,
// not for our own children). Hence it's fine that we're resolving our
// percentages sizes against this basis in IntrinsicForContainer().
nscoord isize = nsLayoutUtils::IntrinsicForContainer(
aInput.mContext, this, IntrinsicISizeType::MinISize,
aInput.mPercentageBasisForChildren);
aData->DefaultAddInlineMinISize(this, isize);
}
/* virtual */
void nsIFrame::AddInlinePrefISize(const IntrinsicSizeInput& aInput,
nsIFrame::InlinePrefISizeData* aData) {
// Note: we are one of the children that mPercentageBasisForChildren was
// prepared for (i.e. our parent frame prepares the percentage basis for us,
// not for our own children). Hence it's fine that we're resolving our
// percentages sizes against this basis in IntrinsicForContainer().
nscoord isize = nsLayoutUtils::IntrinsicForContainer(
aInput.mContext, this, IntrinsicISizeType::PrefISize,
aInput.mPercentageBasisForChildren);
aData->DefaultAddInlinePrefISize(isize);
}
void nsIFrame::InlineMinISizeData::DefaultAddInlineMinISize(nsIFrame* aFrame,
nscoord aISize,
bool aAllowBreak) {
auto parent = aFrame->GetParent();
MOZ_ASSERT(parent, "Must have a parent if we get here!");
const bool mayBreak = aAllowBreak && !aFrame->CanContinueTextRun() &&
!parent->Style()->ShouldSuppressLineBreak() &&
parent->StyleText()->WhiteSpaceCanWrap(parent);
if (mayBreak) {
OptionallyBreak();
}
mTrailingWhitespace = 0;
mSkipWhitespace = false;
mCurrentLine += aISize;
mAtStartOfLine = false;
if (mayBreak) {
OptionallyBreak();
}
}
void nsIFrame::InlinePrefISizeData::DefaultAddInlinePrefISize(nscoord aISize) {
mCurrentLine = NSCoordSaturatingAdd(mCurrentLine, aISize);
mTrailingWhitespace = 0;
mSkipWhitespace = false;
mLineIsEmpty = false;
}
void nsIFrame::InlineMinISizeData::ForceBreak() {
mCurrentLine -= mTrailingWhitespace;
mPrevLines = std::max(mPrevLines, mCurrentLine);
mCurrentLine = mTrailingWhitespace = 0;
for (const FloatInfo& floatInfo : mFloats) {
mPrevLines = std::max(floatInfo.ISize(), mPrevLines);
}
mFloats.Clear();
mSkipWhitespace = true;
}
void nsIFrame::InlineMinISizeData::OptionallyBreak(nscoord aHyphenWidth) {
// If we can fit more content into a smaller width by staying on this
// line (because we're still at a negative offset due to negative
// text-indent or negative margin), don't break. Otherwise, do the
// same as ForceBreak. it doesn't really matter when we accumulate
// floats.
if (mCurrentLine + aHyphenWidth < 0 || mAtStartOfLine) {
return;
}
mCurrentLine += aHyphenWidth;
ForceBreak();
}
void nsIFrame::InlinePrefISizeData::ForceBreak(UsedClear aClearType) {
// If this force break is not clearing any float, we can leave all the
// floats to the next force break.
if (!mFloats.IsEmpty() && aClearType != UsedClear::None) {
// Preferred isize accumulated for floats that have already
// been cleared past
nscoord floatsDone = 0;
// Preferred isize accumulated for floats that have not yet
// been cleared past
nscoord floatsCurLeft = 0, floatsCurRight = 0;
for (const FloatInfo& floatInfo : mFloats) {
const nsStyleDisplay* floatDisp = floatInfo.Frame()->StyleDisplay();
auto cbWM = floatInfo.Frame()->GetParent()->GetWritingMode();
UsedClear clearType = floatDisp->UsedClear(cbWM);
if (clearType == UsedClear::Left || clearType == UsedClear::Right ||
clearType == UsedClear::Both) {
nscoord floatsCur = NSCoordSaturatingAdd(floatsCurLeft, floatsCurRight);
if (floatsCur > floatsDone) {
floatsDone = floatsCur;
}
if (clearType != UsedClear::Right) {
floatsCurLeft = 0;
}
if (clearType != UsedClear::Left) {
floatsCurRight = 0;
}
}
UsedFloat floatStyle = floatDisp->UsedFloat(cbWM);
nscoord& floatsCur =
floatStyle == UsedFloat::Left ? floatsCurLeft : floatsCurRight;
nscoord floatISize = floatInfo.ISize();
// Negative-width floats don't change the available space so they
// shouldn't change our intrinsic line isize either.
floatsCur = NSCoordSaturatingAdd(floatsCur, std::max(0, floatISize));
}
nscoord floatsCur = NSCoordSaturatingAdd(floatsCurLeft, floatsCurRight);
if (floatsCur > floatsDone) {
floatsDone = floatsCur;
}
mCurrentLine = NSCoordSaturatingAdd(mCurrentLine, floatsDone);
if (aClearType == UsedClear::Both) {
mFloats.Clear();
} else {
// If the break type does not clear all floats, it means there may
// be some floats whose isize should contribute to the intrinsic
// isize of the next line. The code here scans the current mFloats
// and keeps floats which are not cleared by this break. Note that
// floats may be cleared directly or indirectly. See below.
nsTArray<FloatInfo> newFloats;
MOZ_ASSERT(
aClearType == UsedClear::Left || aClearType == UsedClear::Right,
"Other values should have been handled in other branches");
UsedFloat clearFloatType =
aClearType == UsedClear::Left ? UsedFloat::Left : UsedFloat::Right;
// Iterate the array in reverse so that we can stop when there are
// no longer any floats we need to keep. See below.
for (FloatInfo& floatInfo : Reversed(mFloats)) {
const nsStyleDisplay* floatDisp = floatInfo.Frame()->StyleDisplay();
auto cbWM = floatInfo.Frame()->GetParent()->GetWritingMode();
if (floatDisp->UsedFloat(cbWM) != clearFloatType) {
newFloats.AppendElement(floatInfo);
} else {
// This is a float on the side that this break directly clears
// which means we're not keeping it in mFloats. However, if
// this float clears floats on the opposite side (via a value
// of either 'both' or one of 'left'/'right'), any remaining
// (earlier) floats on that side would be indirectly cleared
// as well. Thus, we should break out of this loop and stop
// considering earlier floats to be kept in mFloats.
UsedClear clearType = floatDisp->UsedClear(cbWM);
if (clearType != aClearType && clearType != UsedClear::None) {
break;
}
}
}
newFloats.Reverse();
mFloats = std::move(newFloats);
}
}
mCurrentLine =
NSCoordSaturatingSubtract(mCurrentLine, mTrailingWhitespace, nscoord_MAX);
mPrevLines = std::max(mPrevLines, mCurrentLine);
mCurrentLine = mTrailingWhitespace = 0;
mSkipWhitespace = true;
mLineIsEmpty = true;
}
static nscoord ResolveMargin(const StyleMargin& aStyle,
nscoord aPercentageBasis) {
if (!aStyle.IsLengthPercentage()) {
return nscoord(0);
}
return nsLayoutUtils::ResolveToLength<false>(aStyle.AsLengthPercentage(),
aPercentageBasis);
}
static nscoord ResolvePadding(const LengthPercentage& aStyle,
nscoord aPercentageBasis) {
return nsLayoutUtils::ResolveToLength<true>(aStyle, aPercentageBasis);
}
static nsIFrame::IntrinsicSizeOffsetData IntrinsicSizeOffsets(
nsIFrame* aFrame, nscoord aPercentageBasis, bool aForISize) {
nsIFrame::IntrinsicSizeOffsetData result;
WritingMode wm = aFrame->GetWritingMode();
bool verticalAxis = aForISize == wm.IsVertical();
const auto* styleMargin = aFrame->StyleMargin();
if (verticalAxis) {
result.margin +=
ResolveMargin(styleMargin->GetMargin(eSideTop), aPercentageBasis);
result.margin +=
ResolveMargin(styleMargin->GetMargin(eSideBottom), aPercentageBasis);
} else {
result.margin +=
ResolveMargin(styleMargin->GetMargin(eSideLeft), aPercentageBasis);
result.margin +=
ResolveMargin(styleMargin->GetMargin(eSideRight), aPercentageBasis);
}
const auto& padding = aFrame->StylePadding()->mPadding;
if (verticalAxis) {
result.padding += ResolvePadding(padding.Get(eSideTop), aPercentageBasis);
result.padding +=
ResolvePadding(padding.Get(eSideBottom), aPercentageBasis);
} else {
result.padding += ResolvePadding(padding.Get(eSideLeft), aPercentageBasis);
result.padding += ResolvePadding(padding.Get(eSideRight), aPercentageBasis);
}
const nsStyleBorder* styleBorder = aFrame->StyleBorder();
if (verticalAxis) {
result.border += styleBorder->GetComputedBorderWidth(eSideTop);
result.border += styleBorder->GetComputedBorderWidth(eSideBottom);
} else {
result.border += styleBorder->GetComputedBorderWidth(eSideLeft);
result.border += styleBorder->GetComputedBorderWidth(eSideRight);
}
const nsStyleDisplay* disp = aFrame->StyleDisplay();
if (aFrame->IsThemed(disp)) {
nsPresContext* presContext = aFrame->PresContext();
LayoutDeviceIntMargin border = presContext->Theme()->GetWidgetBorder(
presContext->DeviceContext(), aFrame, disp->EffectiveAppearance());
result.border = presContext->DevPixelsToAppUnits(
verticalAxis ? border.TopBottom() : border.LeftRight());
LayoutDeviceIntMargin padding;
if (presContext->Theme()->GetWidgetPadding(
presContext->DeviceContext(), aFrame, disp->EffectiveAppearance(),
&padding)) {
result.padding = presContext->DevPixelsToAppUnits(
verticalAxis ? padding.TopBottom() : padding.LeftRight());
}
}
return result;
}
/* virtual */ nsIFrame::IntrinsicSizeOffsetData nsIFrame::IntrinsicISizeOffsets(
nscoord aPercentageBasis) {
return IntrinsicSizeOffsets(this, aPercentageBasis, true);
}
nsIFrame::IntrinsicSizeOffsetData nsIFrame::IntrinsicBSizeOffsets(
nscoord aPercentageBasis) {
return IntrinsicSizeOffsets(this, aPercentageBasis, false);
}
/* virtual */
IntrinsicSize nsIFrame::GetIntrinsicSize() {
// Defaults to no intrinsic size.
return IntrinsicSize();
}
AspectRatio nsIFrame::GetAspectRatio() const {
// Per spec, 'aspect-ratio' property applies to all elements except inline
// boxes and internal ruby or table boxes.
// For those frame types that don't support aspect-ratio, they must not have
// the natural ratio, so this early return is fine.
if (!SupportsAspectRatio()) {
return AspectRatio();
}
const StyleAspectRatio& aspectRatio = StylePosition()->mAspectRatio;
// If aspect-ratio is zero or infinite, it's a degenerate ratio and behaves
// as auto.
if (!aspectRatio.BehavesAsAuto()) {
// Non-auto. Return the preferred aspect ratio from the aspect-ratio style.
return aspectRatio.ratio.AsRatio().ToLayoutRatio(UseBoxSizing::Yes);
}
// The rest of the cases are when aspect-ratio has 'auto'.
if (auto intrinsicRatio = GetIntrinsicRatio()) {
return intrinsicRatio;
}
if (aspectRatio.HasRatio()) {
// If it's a degenerate ratio, this returns 0. Just the same as the auto
// case.
return aspectRatio.ratio.AsRatio().ToLayoutRatio(UseBoxSizing::No);
}
return AspectRatio();
}
/* virtual */
AspectRatio nsIFrame::GetIntrinsicRatio() const { return AspectRatio(); }
static bool ShouldApplyAutomaticMinimumOnInlineAxis(
WritingMode aWM, const nsStyleDisplay* aDisplay,
const nsStylePosition* aPosition) {
// Apply the automatic minimum size for aspect ratio:
// Note: The replaced elements shouldn't be here, so we only check the scroll
// container.
return !aDisplay->IsScrollableOverflow() && aPosition->MinISize(aWM).IsAuto();
}
/* virtual */
nsIFrame::SizeComputationResult nsIFrame::ComputeSize(
gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize,
nscoord aAvailableISize, const LogicalSize& aMargin,
const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides,
ComputeSizeFlags aFlags) {
MOZ_ASSERT(!GetIntrinsicRatio(),
"Please override this method and call "
"nsContainerFrame::ComputeSizeWithIntrinsicDimensions instead.");
LogicalSize result =
ComputeAutoSize(aRenderingContext, aWM, aCBSize, aAvailableISize, aMargin,
aBorderPadding, aSizeOverrides, aFlags);
const nsStylePosition* stylePos = StylePosition();
const nsStyleDisplay* disp = StyleDisplay();
auto aspectRatioUsage = AspectRatioUsage::None;
const auto boxSizingAdjust = stylePos->mBoxSizing == StyleBoxSizing::Border
? aBorderPadding
: LogicalSize(aWM);
nscoord boxSizingToMarginEdgeISize = aMargin.ISize(aWM) +
aBorderPadding.ISize(aWM) -
boxSizingAdjust.ISize(aWM);
const auto& styleISize = aSizeOverrides.mStyleISize
? *aSizeOverrides.mStyleISize
: stylePos->ISize(aWM);
const auto& styleBSize = aSizeOverrides.mStyleBSize
? *aSizeOverrides.mStyleBSize
: stylePos->BSize(aWM);
const auto& aspectRatio = aSizeOverrides.mAspectRatio
? *aSizeOverrides.mAspectRatio
: GetAspectRatio();
auto parentFrame = GetParent();
auto alignCB = parentFrame;
bool isGridItem = IsGridItem();
const bool isSubgrid = IsSubgrid();
if (parentFrame && parentFrame->IsTableWrapperFrame() && IsTableFrame()) {
// An inner table frame is sized as a grid item if its table wrapper is,
// because they actually have the same CB (the wrapper's CB).
// @see ReflowInput::InitCBReflowInput
auto tableWrapper = GetParent();
auto grandParent = tableWrapper->GetParent();
isGridItem = grandParent->IsGridContainerFrame() &&
!tableWrapper->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW);
if (isGridItem) {
// When resolving justify/align-self below, we want to use the grid
// container's justify/align-items value and WritingMode.
alignCB = grandParent;
}
}
// flexItemMainAxis is set if this frame is a flex item in a modern flexbox
// layout. It indicates which logical axis (in this frame's own WM)
// corresponds to its flex container's main axis.
Maybe<LogicalAxis> flexItemMainAxis;
if (IsFlexItem() && !parentFrame->HasAnyStateBits(
NS_STATE_FLEX_IS_EMULATING_LEGACY_WEBKIT_BOX)) {
flexItemMainAxis = Some(nsFlexContainerFrame::IsItemInlineAxisMainAxis(this)
? LogicalAxis::Inline
: LogicalAxis::Block);
}
const bool isOrthogonal = aWM.IsOrthogonalTo(alignCB->GetWritingMode());
const bool isAutoISize = styleISize.IsAuto();
const bool isAutoBSize =
nsLayoutUtils::IsAutoBSize(styleBSize, aCBSize.BSize(aWM));
// Compute inline-axis size
const bool isSubgriddedInInlineAxis =
isSubgrid && static_cast<nsGridContainerFrame*>(this)->IsColSubgrid();
// subgridded in the inline-axis, ignore our style inline-size, and stretch to
// fill the CB.
const bool shouldComputeISize = !isAutoISize && !isSubgriddedInInlineAxis;
if (shouldComputeISize) {
auto iSizeResult =
ComputeISizeValue(aRenderingContext, aWM, aCBSize, boxSizingAdjust,
boxSizingToMarginEdgeISize, styleISize, styleBSize,
aspectRatio, aFlags);
result.ISize(aWM) = iSizeResult.mISize;
aspectRatioUsage = iSizeResult.mAspectRatioUsage;
} else if (MOZ_UNLIKELY(isGridItem) && !IsTrueOverflowContainer()) {
// 'auto' inline-size for grid-level box - fill the CB for 'stretch' /
// 'normal' and clamp it to the CB if requested:
bool stretch = false;
bool mayUseAspectRatio = aspectRatio && !isAutoBSize;
if (!aFlags.contains(ComputeSizeFlag::ShrinkWrap) &&
!StyleMargin()->HasInlineAxisAuto(aWM) &&
!alignCB->IsMasonry(isOrthogonal ? LogicalAxis::Block
: LogicalAxis::Inline)) {
auto inlineAxisAlignment =
isOrthogonal ? StylePosition()->UsedAlignSelf(alignCB->Style())._0
: StylePosition()->UsedJustifySelf(alignCB->Style())._0;
stretch = inlineAxisAlignment == StyleAlignFlags::STRETCH ||
(inlineAxisAlignment == StyleAlignFlags::NORMAL &&
!mayUseAspectRatio);
}
// Apply the preferred aspect ratio for alignments other than *stretch* and
// *normal without aspect ratio*.
// The spec says all other values should size the items as fit-content, and
// the intrinsic size should respect the preferred aspect ratio, so we also
// apply aspect ratio for all other values.
if (!stretch && mayUseAspectRatio) {
result.ISize(aWM) = ComputeISizeValueFromAspectRatio(
aWM, aCBSize, boxSizingAdjust, styleBSize.AsLengthPercentage(),
aspectRatio);
aspectRatioUsage = AspectRatioUsage::ToComputeISize;
}
if (stretch || aFlags.contains(ComputeSizeFlag::IClampMarginBoxMinSize)) {
auto iSizeToFillCB =
std::max(nscoord(0), aCBSize.ISize(aWM) - aBorderPadding.ISize(aWM) -
aMargin.ISize(aWM));
if (stretch || result.ISize(aWM) > iSizeToFillCB) {
result.ISize(aWM) = iSizeToFillCB;
}
}
} else if (aspectRatio && !isAutoBSize) {
// Note: if both the inline size and the block size are auto, the block axis
// is the ratio-dependent axis by default. That means we only need to
// transfer the resolved inline size via aspect-ratio to block axis later in
// this method, but not the other way around.
//
// In this branch, we transfer the non-auto block size via aspect-ration to
// inline axis.
result.ISize(aWM) = ComputeISizeValueFromAspectRatio(
aWM, aCBSize, boxSizingAdjust, styleBSize.AsLengthPercentage(),
aspectRatio);
aspectRatioUsage = AspectRatioUsage::ToComputeISize;
}
// Calculate and apply transferred min & max size contraints.
//
// Note: The basic principle is that sizing constraints transfer through the
// aspect-ratio to the other side to preserve the aspect ratio to the extent
// that they can without violating any sizes specified explicitly on that
// affected axis.
//
// FIXME: The spec words may not be correct, so we may have to update this
// tentative solution once this spec issue gets resolved. Here, we clamp the
// flex base size by the transferred min and max sizes, and don't include
// the transferred min & max sizes into its used min & max sizes. So this
// lets us match other browsers' current behaviors.
//
// Note: This may make more sense if we clamp the flex base size in
// FlexItem::ResolveFlexBaseSizeFromAspectRatio(). However, the result should
// be identical. FlexItem::ResolveFlexBaseSizeFromAspectRatio() only handles
// the case of the definite cross size, and the definite cross size is clamped
// by the min & max cross sizes below in this function. This means its flex
// base size has been clamped by the transferred min & max size already after
// generating the flex items. So here we make the code more general for both
// definite cross size and indefinite cross size.
const bool isDefiniteISize = styleISize.IsLengthPercentage();
const auto& minBSizeCoord = stylePos->MinBSize(aWM);
const auto& maxBSizeCoord = stylePos->MaxBSize(aWM);
const bool isAutoMinBSize =
nsLayoutUtils::IsAutoBSize(minBSizeCoord, aCBSize.BSize(aWM));
const bool isAutoMaxBSize =
nsLayoutUtils::IsAutoBSize(maxBSizeCoord, aCBSize.BSize(aWM));
if (aspectRatio && !isDefiniteISize) {
// Note: the spec mentions that
// 1. This transferred minimum is capped by any definite preferred or
// maximum size in the destination axis.
// 2. This transferred maximum is floored by any definite preferred or
// minimum size in the destination axis.
//
//
// The spec requires us to clamp these by the specified size (it calls it
// the preferred size). However, we actually don't need to worry about that,
// because we are here only if the inline size is indefinite.
//
// We do not need to clamp the transferred minimum and maximum as long as we
// always apply the transferred min/max size before the explicit min/max
// size; the result will be identical.
const nscoord transferredMinISize =
isAutoMinBSize ? 0
: ComputeISizeValueFromAspectRatio(
aWM, aCBSize, boxSizingAdjust,
minBSizeCoord.AsLengthPercentage(), aspectRatio);
const nscoord transferredMaxISize =
isAutoMaxBSize ? nscoord_MAX
: ComputeISizeValueFromAspectRatio(
aWM, aCBSize, boxSizingAdjust,
maxBSizeCoord.AsLengthPercentage(), aspectRatio);
result.ISize(aWM) =
CSSMinMax(result.ISize(aWM), transferredMinISize, transferredMaxISize);
}
// Flex items ignore their min & max sizing properties in their flex
// container's main-axis. (Those properties get applied later in the flexbox
// algorithm.)
const bool isFlexItemInlineAxisMainAxis =
flexItemMainAxis && *flexItemMainAxis == LogicalAxis::Inline;
// Grid items that are subgridded in inline-axis also ignore their min & max
// sizing properties in that axis.
const bool shouldIgnoreMinMaxISize =
isFlexItemInlineAxisMainAxis || isSubgriddedInInlineAxis;
const auto& maxISizeCoord = stylePos->MaxISize(aWM);
nscoord maxISize = NS_UNCONSTRAINEDSIZE;
if (!maxISizeCoord.IsNone() && !shouldIgnoreMinMaxISize) {
maxISize = ComputeISizeValue(aRenderingContext, aWM, aCBSize,
boxSizingAdjust, boxSizingToMarginEdgeISize,
maxISizeCoord, styleBSize, aspectRatio, aFlags)
.mISize;
result.ISize(aWM) = std::min(maxISize, result.ISize(aWM));
}
const nscoord bSizeAsPercentageBasis = ComputeBSizeValueAsPercentageBasis(
styleBSize, minBSizeCoord, maxBSizeCoord, aCBSize.BSize(aWM),
boxSizingAdjust.BSize(aWM));
const IntrinsicSizeInput input(
aRenderingContext, Some(aCBSize.ConvertTo(GetWritingMode(), aWM)),
Some(LogicalSize(aWM, NS_UNCONSTRAINEDSIZE, bSizeAsPercentageBasis)
.ConvertTo(GetWritingMode(), aWM)));
const auto& minISizeCoord = stylePos->MinISize(aWM);
nscoord minISize;
if (!minISizeCoord.IsAuto() && !shouldIgnoreMinMaxISize) {
minISize = ComputeISizeValue(aRenderingContext, aWM, aCBSize,
boxSizingAdjust, boxSizingToMarginEdgeISize,
minISizeCoord, styleBSize, aspectRatio, aFlags)
.mISize;
} else if (MOZ_UNLIKELY(
aFlags.contains(ComputeSizeFlag::IApplyAutoMinSize))) {
// This implements "Implied Minimum Size of Grid Items".
minISize = std::min(maxISize, GetMinISize(input));
if (styleISize.IsLengthPercentage()) {
minISize = std::min(minISize, result.ISize(aWM));
} else if (aFlags.contains(ComputeSizeFlag::IClampMarginBoxMinSize)) {
// "if the grid item spans only grid tracks that have a fixed max track
// sizing function, its automatic minimum size in that dimension is
// further clamped to less than or equal to the size necessary to fit
// its margin box within the resulting grid area (flooring at zero)"
auto maxMinISize =
std::max(nscoord(0), aCBSize.ISize(aWM) - aBorderPadding.ISize(aWM) -
aMargin.ISize(aWM));
minISize = std::min(minISize, maxMinISize);
}
} else if (aspectRatioUsage == AspectRatioUsage::ToComputeISize &&
ShouldApplyAutomaticMinimumOnInlineAxis(aWM, disp, stylePos)) {
// This means we successfully applied aspect-ratio and now need to check
// if we need to apply the automatic content-based minimum size:
MOZ_ASSERT(!HasReplacedSizing(),
"aspect-ratio minimums should not apply to replaced elements");
// The inline size computed by aspect-ratio shouldn't less than the
// min-content size, which should be capped by its maximum inline size.
minISize = std::min(GetMinISize(input), maxISize);
} else {
// Treat "min-width: auto" as 0.
// NOTE: Technically, "auto" is supposed to behave like "min-content" on
// flex items. However, we don't need to worry about that here, because
// flex items' min-sizes are intentionally ignored until the flex
// container explicitly considers them during space distribution.
minISize = 0;
}
result.ISize(aWM) = std::max(minISize, result.ISize(aWM));
// Compute block-axis size
// (but not if we have auto bsize -- then, we'll just stick with the bsize
// that we already calculated in the initial ComputeAutoSize() call. However,
// if we have a valid preferred aspect ratio, we still have to compute the
// block size because aspect ratio affects the intrinsic content size.)
const bool isSubgriddedInBlockAxis =
isSubgrid && static_cast<nsGridContainerFrame*>(this)->IsRowSubgrid();
// subgridded in the block-axis, ignore our style block-size, and stretch to
// fill the CB.
const bool shouldComputeBSize = !isAutoBSize && !isSubgriddedInBlockAxis;
if (shouldComputeBSize) {
result.BSize(aWM) = nsLayoutUtils::ComputeBSizeValue(
aCBSize.BSize(aWM), boxSizingAdjust.BSize(aWM),
styleBSize.AsLengthPercentage());
} else if (MOZ_UNLIKELY(isGridItem) && styleBSize.IsAuto() &&
!aFlags.contains(ComputeSizeFlag::IsGridMeasuringReflow) &&
!IsTrueOverflowContainer() &&
!alignCB->IsMasonry(isOrthogonal ? LogicalAxis::Inline
: LogicalAxis::Block)) {
auto cbSize = aCBSize.BSize(aWM);
if (cbSize != NS_UNCONSTRAINEDSIZE) {
// 'auto' block-size for grid-level box - fill the CB for 'stretch' /
// 'normal' and clamp it to the CB if requested:
bool stretch = false;
bool mayUseAspectRatio =
aspectRatio && result.ISize(aWM) != NS_UNCONSTRAINEDSIZE;
if (!StyleMargin()->HasBlockAxisAuto(aWM)) {
auto blockAxisAlignment =
isOrthogonal ? StylePosition()->UsedJustifySelf(alignCB->Style())._0
: StylePosition()->UsedAlignSelf(alignCB->Style())._0;
stretch = blockAxisAlignment == StyleAlignFlags::STRETCH ||
(blockAxisAlignment == StyleAlignFlags::NORMAL &&
!mayUseAspectRatio);
}
// Apply the preferred aspect ratio for alignments other than *stretch*
// and *normal without aspect ratio*.
// The spec says all other values should size the items as fit-content,
// and the intrinsic size should respect the preferred aspect ratio, so
// we also apply aspect ratio for all other values.
if (!stretch && mayUseAspectRatio) {
result.BSize(aWM) = aspectRatio.ComputeRatioDependentSize(
LogicalAxis::Block, aWM, result.ISize(aWM), boxSizingAdjust);
MOZ_ASSERT(aspectRatioUsage == AspectRatioUsage::None);
aspectRatioUsage = AspectRatioUsage::ToComputeBSize;
}
if (stretch || aFlags.contains(ComputeSizeFlag::BClampMarginBoxMinSize)) {
auto bSizeToFillCB =
std::max(nscoord(0),
cbSize - aBorderPadding.BSize(aWM) - aMargin.BSize(aWM));
if (stretch || (result.BSize(aWM) != NS_UNCONSTRAINEDSIZE &&
result.BSize(aWM) > bSizeToFillCB)) {
result.BSize(aWM) = bSizeToFillCB;
}
}
}
} else if (aspectRatio) {
// If both inline and block dimensions are auto, the block axis is the
// ratio-dependent axis by default.
// If we have a super large inline size, aspect-ratio should still be
// applied (so aspectRatioUsage flag is set as expected). That's why we
// apply aspect-ratio unconditionally for auto block size here.
result.BSize(aWM) = aspectRatio.ComputeRatioDependentSize(
LogicalAxis::Block, aWM, result.ISize(aWM), boxSizingAdjust);
MOZ_ASSERT(aspectRatioUsage == AspectRatioUsage::None);
aspectRatioUsage = AspectRatioUsage::ToComputeBSize;
}
if (result.BSize(aWM) != NS_UNCONSTRAINEDSIZE) {
// Flex items ignore their min & max sizing properties in their flex
// container's main-axis. (Those properties get applied later in the flexbox
// algorithm.)
const bool isFlexItemBlockAxisMainAxis =
flexItemMainAxis && *flexItemMainAxis == LogicalAxis::Block;
// Grid items that are subgridded in block-axis also ignore their min & max
// sizing properties in that axis.
const bool shouldIgnoreMinMaxBSize =
isFlexItemBlockAxisMainAxis || isSubgriddedInBlockAxis;
if (!isAutoMaxBSize && !shouldIgnoreMinMaxBSize) {
nscoord maxBSize = nsLayoutUtils::ComputeBSizeValue(
aCBSize.BSize(aWM), boxSizingAdjust.BSize(aWM),
maxBSizeCoord.AsLengthPercentage());
result.BSize(aWM) = std::min(maxBSize, result.BSize(aWM));
}
if (!isAutoMinBSize && !shouldIgnoreMinMaxBSize) {
nscoord minBSize = nsLayoutUtils::ComputeBSizeValue(
aCBSize.BSize(aWM), boxSizingAdjust.BSize(aWM),
minBSizeCoord.AsLengthPercentage());
result.BSize(aWM) = std::max(minBSize, result.BSize(aWM));
}
}
if (IsThemed(disp)) {
nsPresContext* pc = PresContext();
const LayoutDeviceIntSize widget = pc->Theme()->GetMinimumWidgetSize(
pc, this, disp->EffectiveAppearance());
// Convert themed widget's physical dimensions to logical coords
LogicalSize size(aWM, LayoutDeviceIntSize::ToAppUnits(
widget, pc->AppUnitsPerDevPixel()));
// GetMinimumWidgetSize() returns border-box; we need content-box.
size -= aBorderPadding;
if (size.BSize(aWM) > result.BSize(aWM)) {
result.BSize(aWM) = size.BSize(aWM);
}
if (size.ISize(aWM) > result.ISize(aWM)) {
result.ISize(aWM) = size.ISize(aWM);
}
}
result.ISize(aWM) = std::max(0, result.ISize(aWM));
result.BSize(aWM) = std::max(0, result.BSize(aWM));
return {result, aspectRatioUsage};
}
nscoord nsIFrame::ComputeBSizeValueAsPercentageBasis(
const StyleSize& aStyleBSize, const StyleSize& aStyleMinBSize,
const StyleMaxSize& aStyleMaxBSize, nscoord aCBBSize,
nscoord aContentEdgeToBoxSizingBSize) {
if (nsLayoutUtils::IsAutoBSize(aStyleBSize, aCBBSize)) {
return NS_UNCONSTRAINEDSIZE;
}
const nscoord bSize = nsLayoutUtils::ComputeBSizeValue(
aCBBSize, aContentEdgeToBoxSizingBSize, aStyleBSize.AsLengthPercentage());
const nscoord minBSize = nsLayoutUtils::IsAutoBSize(aStyleMinBSize, aCBBSize)
? 0
: nsLayoutUtils::ComputeBSizeValue(
aCBBSize, aContentEdgeToBoxSizingBSize,
aStyleMinBSize.AsLengthPercentage());
const nscoord maxBSize = nsLayoutUtils::IsAutoBSize(aStyleMaxBSize, aCBBSize)
? NS_UNCONSTRAINEDSIZE
: nsLayoutUtils::ComputeBSizeValue(
aCBBSize, aContentEdgeToBoxSizingBSize,
aStyleMaxBSize.AsLengthPercentage());
return CSSMinMax(bSize, minBSize, maxBSize);
}
nsRect nsIFrame::ComputeTightBounds(DrawTarget* aDrawTarget) const {
return InkOverflowRect();
}
/* virtual */
nsresult nsIFrame::GetPrefWidthTightBounds(gfxContext* aContext, nscoord* aX,
nscoord* aXMost) {
return NS_ERROR_NOT_IMPLEMENTED;
}
/* virtual */
LogicalSize nsIFrame::ComputeAutoSize(
gfxContext* aRenderingContext, WritingMode aWM,
const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
const mozilla::LogicalSize& aMargin,
const mozilla::LogicalSize& aBorderPadding,
const StyleSizeOverrides& aSizeOverrides, ComputeSizeFlags aFlags) {
if (IsAbsolutelyPositionedWithDefiniteContainingBlock()) {
return ComputeAbsolutePosAutoSize(aRenderingContext, aWM, aCBSize,
aAvailableISize, aMargin, aBorderPadding,
aSizeOverrides, aFlags);
}
// Use basic shrink-wrapping as a default implementation.
LogicalSize result(aWM, 0xdeadbeef, NS_UNCONSTRAINEDSIZE);
// don't bother setting it if the result won't be used
const auto& styleISize = aSizeOverrides.mStyleISize
? *aSizeOverrides.mStyleISize
: StylePosition()->ISize(aWM);
if (styleISize.IsAuto()) {
nscoord availBased =
aAvailableISize - aMargin.ISize(aWM) - aBorderPadding.ISize(aWM);
const auto* stylePos = StylePosition();
const auto& styleBSize = aSizeOverrides.mStyleBSize
? *aSizeOverrides.mStyleBSize
: stylePos->BSize(aWM);
const LogicalSize contentEdgeToBoxSizing =
stylePos->mBoxSizing == StyleBoxSizing::Border ? aBorderPadding
: LogicalSize(aWM);
const nscoord bSize = ComputeBSizeValueAsPercentageBasis(
styleBSize, stylePos->MinBSize(aWM), stylePos->MaxBSize(aWM),
aCBSize.BSize(aWM), contentEdgeToBoxSizing.BSize(aWM));
const IntrinsicSizeInput input(
aRenderingContext, Some(aCBSize.ConvertTo(GetWritingMode(), aWM)),
Some(LogicalSize(aWM, NS_UNCONSTRAINEDSIZE, bSize)
.ConvertTo(GetWritingMode(), aWM)));
result.ISize(aWM) = ShrinkISizeToFit(input, availBased, aFlags);
}
return result;
}
bool nsIFrame::IsAbsolutelyPositionedWithDefiniteContainingBlock() const {
// definite size, in a continuation context, the full extent of the containing
// block is not known.
return MOZ_UNLIKELY(IsAbsolutelyPositioned()) && !GetPrevInFlow();
}
LogicalSize nsIFrame::ComputeAbsolutePosAutoSize(
gfxContext* aRenderingContext, WritingMode aWM,
const mozilla::LogicalSize& aCBSize, nscoord aAvailableISize,
const mozilla::LogicalSize& aMargin,
const mozilla::LogicalSize& aBorderPadding,
const StyleSizeOverrides& aSizeOverrides, const ComputeSizeFlags& aFlags) {
MOZ_ASSERT(IsAbsolutelyPositionedWithDefiniteContainingBlock(),
"Asking for absolute auto size when not absolute");
// Ideally, this is an assertion, but the containing block could just be
// really big.
NS_WARNING_ASSERTION(aCBSize.ISize(aWM) != NS_UNCONSTRAINEDSIZE &&
aCBSize.BSize(aWM) != NS_UNCONSTRAINEDSIZE,
"Absolute containing block size not definite?");
LogicalSize result(aWM, static_cast<nscoord>(0xdeadbeef),
NS_UNCONSTRAINEDSIZE);
const auto* stylePos = StylePosition();
const auto& styleISize = aSizeOverrides.mStyleISize
? *aSizeOverrides.mStyleISize
: stylePos->ISize(aWM);
const auto& styleBSize = aSizeOverrides.mStyleISize
? *aSizeOverrides.mStyleISize
: stylePos->BSize(aWM);
const auto iStartOffsetIsAuto =
stylePos->GetInset(LogicalSide::IStart, aWM).IsAuto();
const auto iEndOffsetIsAuto =
stylePos->GetInset(LogicalSide::IEnd, aWM).IsAuto();
const auto bStartOffsetIsAuto =
stylePos->GetInset(LogicalSide::BStart, aWM).IsAuto();
const auto bEndOffsetIsAuto =
stylePos->GetInset(LogicalSide::BEnd, aWM).IsAuto();
const auto boxSizingAdjust = stylePos->mBoxSizing == StyleBoxSizing::Border
? aBorderPadding
: LogicalSize(aWM);
auto shouldStretch = [](StyleSelfAlignment aAlignment, const nsIFrame* aFrame,
bool aStartIsAuto, bool aEndIsAuto) {
if (aStartIsAuto || aEndIsAuto) {
// however, no one implements the new inset behaviour [2], and the old
// behaviour [3] ends up computing the static size if both or one inset is
// auto.
//
return false;
}
// Don't care about flag bits for auto-sizing.
aAlignment &= ~StyleSelfAlignment::FLAG_BITS;
if (aAlignment == StyleSelfAlignment::STRETCH) {
return true;
}
if (aAlignment == StyleSelfAlignment::NORMAL) {
// Some replaced elements behave as semi-replaced elements - we want them
return !aFrame->HasReplacedSizing() && !aFrame->IsTableWrapperFrame();
}
return false;
};
// i.e. Absolute containing block
const auto* parent = GetParent();
const auto parentWM = parent->GetWritingMode();
// Self alignment properties translate `auto` to normal for this purpose.
const auto inlineAlignSelf = parentWM.IsOrthogonalTo(aWM)
? stylePos->UsedAlignSelf(nullptr)._0
: stylePos->UsedJustifySelf(nullptr)._0;
const auto blockAlignSelf = parentWM.IsOrthogonalTo(aWM)
? stylePos->UsedJustifySelf(nullptr)._0
: stylePos->UsedAlignSelf(nullptr)._0;
const auto iShouldStretch = shouldStretch(
inlineAlignSelf, this, iStartOffsetIsAuto, iEndOffsetIsAuto);
const auto bShouldStretch =
shouldStretch(blockAlignSelf, this, bStartOffsetIsAuto, bEndOffsetIsAuto);
const auto iSizeIsAuto = styleISize.IsAuto();
const auto bSizeIsAuto = styleBSize.IsAuto();
if (bSizeIsAuto && bShouldStretch) {
result.BSize(aWM) =
aCBSize.BSize(aWM) - aBorderPadding.BSize(aWM) - aMargin.BSize(aWM);
}
if (iSizeIsAuto) {
if (iShouldStretch) {
result.ISize(aWM) =
aCBSize.ISize(aWM) - aBorderPadding.ISize(aWM) - aMargin.ISize(aWM);
} else {
nscoord availBased =
aAvailableISize - aMargin.ISize(aWM) - aBorderPadding.ISize(aWM);
const nscoord bSize = ComputeBSizeValueAsPercentageBasis(
styleBSize.IsAuto() && result.BSize(aWM) != NS_UNCONSTRAINEDSIZE
? StyleSize::LengthPercentage(
StyleLengthPercentage::FromAppUnits(result.BSize(aWM)))
: styleBSize,
stylePos->MinBSize(aWM), stylePos->MaxBSize(aWM), aCBSize.BSize(aWM),
boxSizingAdjust.BSize(aWM));
const IntrinsicSizeInput input(
aRenderingContext, Some(aCBSize.ConvertTo(GetWritingMode(), aWM)),
Some(LogicalSize(aWM, availBased, bSize)
.ConvertTo(GetWritingMode(), aWM)));
result.ISize(aWM) = ShrinkISizeToFit(input, availBased, aFlags);
}
}
const auto& aspectRatio = aSizeOverrides.mAspectRatio
? *aSizeOverrides.mAspectRatio
: GetAspectRatio();
if (aspectRatio) {
auto aspectRatioUsage = AspectRatioUsage::None;
if (iSizeIsAuto != bSizeIsAuto) {
// Auto axis is dependent.
if (iSizeIsAuto) {
aspectRatioUsage = AspectRatioUsage::ToComputeBSize;
} else {
aspectRatioUsage = AspectRatioUsage::ToComputeISize;
}
} else if (iSizeIsAuto) {
// Both axes are `auto`.
if (iShouldStretch != bShouldStretch) {
// If an axis has stretch, that behaves like a definite size.
aspectRatioUsage = iShouldStretch ? AspectRatioUsage::ToComputeBSize
: AspectRatioUsage::ToComputeISize;
} else if (!iShouldStretch) {
// If one axis has `auto` inset, that is the ratio dependent axis,
// otherwise the block axis is.
const bool inlineInsetHasAuto =
stylePos->GetInset(LogicalSide::IStart, aWM).IsAuto() ||
stylePos->GetInset(LogicalSide::IEnd, aWM).IsAuto();
const bool blockInsetHasAuto =
stylePos->GetInset(LogicalSide::BStart, aWM).IsAuto() ||
stylePos->GetInset(LogicalSide::BEnd, aWM).IsAuto();
aspectRatioUsage = inlineInsetHasAuto && !blockInsetHasAuto
? AspectRatioUsage::ToComputeISize
: AspectRatioUsage::ToComputeBSize;
}
}
if (aspectRatioUsage == AspectRatioUsage::ToComputeBSize &&
!bShouldStretch) {
result.BSize(aWM) = aspectRatio.ComputeRatioDependentSize(
LogicalAxis::Block, aWM, result.ISize(aWM), boxSizingAdjust);
} else if (aspectRatioUsage == AspectRatioUsage::ToComputeISize &&
!iShouldStretch && result.BSize(aWM) != NS_UNCONSTRAINEDSIZE) {
result.ISize(aWM) = aspectRatio.ComputeRatioDependentSize(
LogicalAxis::Inline, aWM, result.BSize(aWM), boxSizingAdjust);
}
}
return result;
}
nscoord nsIFrame::ShrinkISizeToFit(const IntrinsicSizeInput& aInput,
nscoord aISizeInCB,
ComputeSizeFlags aFlags) {
// If we're a container for font size inflation, then shrink
// wrapping inside of us should not apply font size inflation.
AutoMaybeDisableFontInflation an(this);
nscoord result;
nscoord minISize = GetMinISize(aInput);
if (minISize > aISizeInCB) {
const bool clamp = aFlags.contains(ComputeSizeFlag::IClampMarginBoxMinSize);
result = MOZ_UNLIKELY(clamp) ? aISizeInCB : minISize;
} else {
nscoord prefISize = GetPrefISize(aInput);
if (prefISize > aISizeInCB) {
result = aISizeInCB;
} else {
result = prefISize;
}
}
return result;
}
nscoord nsIFrame::IntrinsicISizeFromInline(const IntrinsicSizeInput& aInput,
IntrinsicISizeType aType) {
MOZ_ASSERT(!IsContainerForFontSizeInflation(),
"Should not be a container for font size inflation!");
if (aType == IntrinsicISizeType::MinISize) {
InlineMinISizeData data;
AddInlineMinISize(aInput, &data);
data.ForceBreak();
return data.mPrevLines;
}
InlinePrefISizeData data;
AddInlinePrefISize(aInput, &data);
data.ForceBreak();
return data.mPrevLines;
}
nscoord nsIFrame::ComputeISizeValueFromAspectRatio(
WritingMode aWM, const LogicalSize& aCBSize,
const LogicalSize& aContentEdgeToBoxSizing, const LengthPercentage& aBSize,
const AspectRatio& aAspectRatio) const {
MOZ_ASSERT(aAspectRatio, "Must have a valid AspectRatio!");
const nscoord bSize = nsLayoutUtils::ComputeBSizeValue(
aCBSize.BSize(aWM), aContentEdgeToBoxSizing.BSize(aWM), aBSize);
return aAspectRatio.ComputeRatioDependentSize(LogicalAxis::Inline, aWM, bSize,
aContentEdgeToBoxSizing);
}
nsIFrame::ISizeComputationResult nsIFrame::ComputeISizeValue(
gfxContext* aRenderingContext, const WritingMode aWM,
const LogicalSize& aCBSize, const LogicalSize& aContentEdgeToBoxSizing,
nscoord aBoxSizingToMarginEdge, ExtremumLength aSize,
Maybe<nscoord> aAvailableISizeOverride, const StyleSize& aStyleBSize,
const AspectRatio& aAspectRatio, ComputeSizeFlags aFlags) {
auto GetAvailableISize = [&]() {
return aCBSize.ISize(aWM) - aBoxSizingToMarginEdge -
aContentEdgeToBoxSizing.ISize(aWM);
};
// If 'this' is a container for font size inflation, then shrink
// wrapping inside of it should not apply font size inflation.
AutoMaybeDisableFontInflation an(this);
// If we have an aspect-ratio and a definite block size, we should use them to
// resolve the sizes with intrinsic keywords.
Maybe<nscoord> iSizeFromAspectRatio = [&]() -> Maybe<nscoord> {
if (aSize == ExtremumLength::MozAvailable ||
aSize == ExtremumLength::Stretch) {
return Nothing();
}
if (!aAspectRatio) {
return Nothing();
}
if (nsLayoutUtils::IsAutoBSize(aStyleBSize, aCBSize.BSize(aWM))) {
return Nothing();
}
return Some(ComputeISizeValueFromAspectRatio(
aWM, aCBSize, aContentEdgeToBoxSizing, aStyleBSize.AsLengthPercentage(),
aAspectRatio));
}();
const auto* stylePos = StylePosition();
const nscoord bSize = ComputeBSizeValueAsPercentageBasis(
aStyleBSize, stylePos->MinBSize(aWM), stylePos->MaxBSize(aWM),
aCBSize.BSize(aWM), aContentEdgeToBoxSizing.BSize(aWM));
const IntrinsicSizeInput input(
aRenderingContext, Some(aCBSize.ConvertTo(GetWritingMode(), aWM)),
Some(LogicalSize(aWM, NS_UNCONSTRAINEDSIZE, bSize)
.ConvertTo(GetWritingMode(), aWM)));
nscoord result;
switch (aSize) {
case ExtremumLength::MaxContent:
result =
iSizeFromAspectRatio ? *iSizeFromAspectRatio : GetPrefISize(input);
NS_ASSERTION(result >= 0, "inline-size less than zero");
return {result, iSizeFromAspectRatio ? AspectRatioUsage::ToComputeISize
: AspectRatioUsage::None};
case ExtremumLength::MinContent:
result =
iSizeFromAspectRatio ? *iSizeFromAspectRatio : GetMinISize(input);
NS_ASSERTION(result >= 0, "inline-size less than zero");
if (MOZ_UNLIKELY(
aFlags.contains(ComputeSizeFlag::IClampMarginBoxMinSize))) {
result = std::min(GetAvailableISize(), result);
}
return {result, iSizeFromAspectRatio ? AspectRatioUsage::ToComputeISize
: AspectRatioUsage::None};
case ExtremumLength::FitContentFunction:
case ExtremumLength::FitContent: {
nscoord pref = NS_UNCONSTRAINEDSIZE;
nscoord min = 0;
if (iSizeFromAspectRatio) {
// The min-content and max-content size are identical and equal to the
// size computed from the block size and the aspect ratio.
pref = min = *iSizeFromAspectRatio;
} else {
pref = GetPrefISize(input);
min = GetMinISize(input);
}
const nscoord fill = aAvailableISizeOverride ? *aAvailableISizeOverride
: GetAvailableISize();
if (MOZ_UNLIKELY(
aFlags.contains(ComputeSizeFlag::IClampMarginBoxMinSize))) {
min = std::min(min, fill);
}
result = std::max(min, std::min(pref, fill));
NS_ASSERTION(result >= 0, "inline-size less than zero");
return {result};
}
case ExtremumLength::MozAvailable:
case ExtremumLength::Stretch:
return {GetAvailableISize()};
}
MOZ_ASSERT_UNREACHABLE("Unknown extremum length?");
return {};
}
nscoord nsIFrame::ComputeISizeValue(const WritingMode aWM,
const LogicalSize& aCBSize,
const LogicalSize& aContentEdgeToBoxSizing,
const LengthPercentage& aSize) const {
LAYOUT_WARN_IF_FALSE(
aCBSize.ISize(aWM) != NS_UNCONSTRAINEDSIZE,
"have unconstrained inline-size; this should only result from "
"very large sizes, not attempts at intrinsic inline-size "
"calculation");
NS_ASSERTION(aCBSize.ISize(aWM) >= 0, "inline-size less than zero");
nscoord result = aSize.Resolve(aCBSize.ISize(aWM));
// The result of a calc() expression might be less than 0; we
// should clamp at runtime (below). (Percentages and coords that
// are less than 0 have already been dropped by the parser.)
result -= aContentEdgeToBoxSizing.ISize(aWM);
return std::max(0, result);
}
void nsIFrame::DidReflow(nsPresContext* aPresContext,
const ReflowInput* aReflowInput) {
NS_FRAME_TRACE(NS_FRAME_TRACE_CALLS, ("nsIFrame::DidReflow"));
if (IsHiddenByContentVisibilityOfInFlowParentForLayout()) {
RemoveStateBits(NS_FRAME_IN_REFLOW);
return;
}
SVGObserverUtils::InvalidateDirectRenderingObservers(
this, SVGObserverUtils::INVALIDATE_REFLOW);
RemoveStateBits(NS_FRAME_IN_REFLOW | NS_FRAME_FIRST_REFLOW |
NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN);
// Clear bits that were used in ReflowInput::InitResizeFlags (see
// comment there for why we can't clear it there).
SetHasBSizeChange(false);
SetHasPaddingChange(false);
// Notify the percent bsize observer if there is a percent bsize.
// The observer may be able to initiate another reflow with a computed
// bsize. This happens in the case where a table cell has no computed
// bsize but can fabricate one when the cell bsize is known.
if (aReflowInput && aReflowInput->mPercentBSizeObserver && !GetPrevInFlow()) {
const auto& bsize =
aReflowInput->mStylePosition->BSize(aReflowInput->GetWritingMode());
if (bsize.HasPercent()) {
aReflowInput->mPercentBSizeObserver->NotifyPercentBSize(*aReflowInput);
}
}
aPresContext->ReflowedFrame();
}
void nsIFrame::FinishReflowWithAbsoluteFrames(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus,
bool aConstrainBSize) {
ReflowAbsoluteFrames(aPresContext, aDesiredSize, aReflowInput, aStatus,
aConstrainBSize);
FinishAndStoreOverflow(&aDesiredSize, aReflowInput.mStyleDisplay);
}
void nsIFrame::ReflowAbsoluteFrames(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus,
bool aConstrainBSize) {
if (HasAbsolutelyPositionedChildren()) {
nsAbsoluteContainingBlock* absoluteContainer = GetAbsoluteContainingBlock();
// Let the absolutely positioned container reflow any absolutely positioned
// child frames that need to be reflowed
// The containing block for the abs pos kids is formed by our padding edge.
nsMargin usedBorder = GetUsedBorder();
nscoord containingBlockWidth =
std::max(0, aDesiredSize.Width() - usedBorder.LeftRight());
nscoord containingBlockHeight =
std::max(0, aDesiredSize.Height() - usedBorder.TopBottom());
nsContainerFrame* container = do_QueryFrame(this);
NS_ASSERTION(container,
"Abs-pos children only supported on container frames for now");
nsRect containingBlock(0, 0, containingBlockWidth, containingBlockHeight);
AbsPosReflowFlags flags =
AbsPosReflowFlags::CBWidthAndHeightChanged; // XXX could be optimized
if (aConstrainBSize) {
flags |= AbsPosReflowFlags::ConstrainHeight;
}
absoluteContainer->Reflow(container, aPresContext, aReflowInput, aStatus,
containingBlock, flags,
&aDesiredSize.mOverflowAreas);
}
}
/* virtual */
bool nsIFrame::CanContinueTextRun() const {
// By default, a frame will *not* allow a text run to be continued
// through it.
return false;
}
void nsIFrame::Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) {
MarkInReflow();
DO_GLOBAL_REFLOW_COUNT("nsFrame");
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
aDesiredSize.ClearSize();
}
bool nsIFrame::IsContentDisabled() const {
// FIXME(emilio): Doing this via CSS means callers must ensure the style is up
// to date, and they don't!
if (StyleUI()->UserInput() == StyleUserInput::None) {
return true;
}
auto* element = nsGenericHTMLElement::FromNodeOrNull(GetContent());
return element && element->IsDisabled();
}
bool nsIFrame::IsContentRelevant() const {
MOZ_ASSERT(StyleDisplay()->ContentVisibility(*this) ==
StyleContentVisibility::Auto);
auto* element = Element::FromNodeOrNull(GetContent());
MOZ_ASSERT(element);
Maybe<ContentRelevancy> relevancy = element->GetContentRelevancy();
return relevancy.isSome() && !relevancy->isEmpty();
}
bool nsIFrame::HidesContent(
const EnumSet<IncludeContentVisibility>& aInclude) const {
auto effectiveContentVisibility = StyleDisplay()->ContentVisibility(*this);
if (aInclude.contains(IncludeContentVisibility::Hidden) &&
effectiveContentVisibility == StyleContentVisibility::Hidden) {
return true;
}
if (aInclude.contains(IncludeContentVisibility::Auto) &&
effectiveContentVisibility == StyleContentVisibility::Auto) {
return !IsContentRelevant();
}
return false;
}
bool nsIFrame::HidesContentForLayout() const {
return HidesContent() && !PresShell()->IsForcingLayoutForHiddenContent(this);
}
bool nsIFrame::IsHiddenByContentVisibilityOfInFlowParentForLayout() const {
const auto* parent = GetInFlowParent();
// The anonymous children owned by parent are important for properly sizing
// their parents.
return parent && parent->HidesContentForLayout() &&
!(parent->HasAnyStateBits(NS_FRAME_OWNS_ANON_BOXES) &&
Style()->IsAnonBox());
}
nsIFrame* nsIFrame::GetClosestContentVisibilityAncestor(
const EnumSet<IncludeContentVisibility>& aInclude) const {
auto* parent = GetInFlowParent();
bool isAnonymousBlock = Style()->IsAnonBox() && parent &&
parent->HasAnyStateBits(NS_FRAME_OWNS_ANON_BOXES);
for (nsIFrame* cur = parent; cur; cur = cur->GetInFlowParent()) {
if (!isAnonymousBlock && cur->HidesContent(aInclude)) {
return cur;
}
// Anonymous boxes are not hidden by the content-visibility of their first
// non-anonymous ancestor, but can be hidden by ancestors further up the
// tree.
isAnonymousBlock = false;
}
return nullptr;
}
bool nsIFrame::IsHiddenByContentVisibilityOnAnyAncestor(
const EnumSet<IncludeContentVisibility>& aInclude) const {
return !!GetClosestContentVisibilityAncestor(aInclude);
}
bool nsIFrame::HasSelectionInSubtree() {
if (IsSelected()) {
return true;
}
RefPtr<nsFrameSelection> frameSelection = GetFrameSelection();
if (!frameSelection) {
return false;
}
const Selection& selection = frameSelection->NormalSelection();
for (uint32_t i = 0; i < selection.RangeCount(); i++) {
auto* range = selection.GetRangeAt(i);
MOZ_ASSERT(range);
const auto* commonAncestorNode =
range->GetRegisteredClosestCommonInclusiveAncestor();
if (commonAncestorNode &&
commonAncestorNode->IsInclusiveDescendantOf(GetContent())) {
return true;
}
}
return false;
}
bool nsIFrame::UpdateIsRelevantContent(
const ContentRelevancy& aRelevancyToUpdate) {
MOZ_ASSERT(StyleDisplay()->ContentVisibility(*this) ==
StyleContentVisibility::Auto);
auto* element = Element::FromNodeOrNull(GetContent());
MOZ_ASSERT(element);
ContentRelevancy newRelevancy;
Maybe<ContentRelevancy> oldRelevancy = element->GetContentRelevancy();
if (oldRelevancy.isSome()) {
newRelevancy = *oldRelevancy;
}
auto setRelevancyValue = [&](ContentRelevancyReason reason, bool value) {
if (value) {
newRelevancy += reason;
} else {
newRelevancy -= reason;
}
};
if (!oldRelevancy ||
aRelevancyToUpdate.contains(ContentRelevancyReason::Visible)) {
Maybe<bool> visible = element->GetVisibleForContentVisibility();
if (visible.isSome()) {
setRelevancyValue(ContentRelevancyReason::Visible, *visible);
}
}
if (!oldRelevancy ||
aRelevancyToUpdate.contains(ContentRelevancyReason::FocusInSubtree)) {
setRelevancyValue(ContentRelevancyReason::FocusInSubtree,
element->State().HasAtLeastOneOfStates(
ElementState::FOCUS_WITHIN | ElementState::FOCUS));
}
if (!oldRelevancy ||
aRelevancyToUpdate.contains(ContentRelevancyReason::Selected)) {
setRelevancyValue(ContentRelevancyReason::Selected,
HasSelectionInSubtree());
}
// If the proximity to the viewport has not been determined yet,
// and neither the element nor its contents are focused or selected,
// we should wait for the determination of the proximity. Otherwise,
// there might be a redundant contentvisibilityautostatechange event.
bool isProximityToViewportDetermined =
oldRelevancy ? true : element->GetVisibleForContentVisibility().isSome();
if (!isProximityToViewportDetermined && newRelevancy.isEmpty()) {
return false;
}
bool overallRelevancyChanged =
!oldRelevancy || oldRelevancy->isEmpty() != newRelevancy.isEmpty();
if (!oldRelevancy || *oldRelevancy != newRelevancy) {
element->SetContentRelevancy(newRelevancy);
}
if (!overallRelevancyChanged) {
return false;
}
HandleLastRememberedSize();
PresContext()->SetNeedsToUpdateHiddenByContentVisibilityForAnimations();
PresShell()->FrameNeedsReflow(
this, IntrinsicDirty::FrameAncestorsAndDescendants, NS_FRAME_IS_DIRTY);
InvalidateFrame();
ContentVisibilityAutoStateChangeEventInit init;
init.mSkipped = newRelevancy.isEmpty();
RefPtr<ContentVisibilityAutoStateChangeEvent> event =
ContentVisibilityAutoStateChangeEvent::Constructor(
element, u"contentvisibilityautostatechange"_ns, init);
// Per
// "This event is dispatched by posting a task at the time when the state
// change occurs."
RefPtr<AsyncEventDispatcher> asyncDispatcher =
new AsyncEventDispatcher(element, event.forget());
DebugOnly<nsresult> rv = asyncDispatcher->PostDOMEvent();
NS_ASSERTION(NS_SUCCEEDED(rv), "AsyncEventDispatcher failed to dispatch");
return true;
}
nsresult nsIFrame::CharacterDataChanged(const CharacterDataChangeInfo&) {
MOZ_ASSERT_UNREACHABLE("should only be called for text frames");
return NS_OK;
}
nsresult nsIFrame::AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
int32_t aModType) {
return NS_OK;
}
nsIFrame* nsIFrame::GetPrevContinuation() const { return nullptr; }
void nsIFrame::SetPrevContinuation(nsIFrame*) {
MOZ_ASSERT_UNREACHABLE("Not splittable!");
}
nsIFrame* nsIFrame::GetNextContinuation() const { return nullptr; }
void nsIFrame::SetNextContinuation(nsIFrame*) {
MOZ_ASSERT_UNREACHABLE("Not splittable!");
}
nsIFrame* nsIFrame::GetPrevInFlow() const { return nullptr; }
void nsIFrame::SetPrevInFlow(nsIFrame*) {
MOZ_ASSERT_UNREACHABLE("Not splittable!");
}
nsIFrame* nsIFrame::GetNextInFlow() const { return nullptr; }
void nsIFrame::SetNextInFlow(nsIFrame*) {
MOZ_ASSERT_UNREACHABLE("Not splittable!");
}
nsIFrame* nsIFrame::GetTailContinuation() {
nsIFrame* frame = this;
while (frame->HasAnyStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER)) {
frame = frame->GetPrevContinuation();
NS_ASSERTION(frame, "first continuation can't be overflow container");
}
for (nsIFrame* next = frame->GetNextContinuation();
next && !next->HasAnyStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
next = frame->GetNextContinuation()) {
frame = next;
}
MOZ_ASSERT(frame, "illegal state in continuation chain.");
return frame;
}
// Associated view object
void nsIFrame::SetView(nsView* aView) {
if (aView) {
aView->SetFrame(this);
#ifdef DEBUG
LayoutFrameType frameType = Type();
NS_ASSERTION(frameType == LayoutFrameType::SubDocument ||
frameType == LayoutFrameType::Viewport ||
frameType == LayoutFrameType::MenuPopup,
"Only specific frame types can have an nsView");
#endif
// Store the view on the frame.
SetViewInternal(aView);
// Set the frame state bit that says the frame has a view
AddStateBits(NS_FRAME_HAS_VIEW);
// Let all of the ancestors know they have a descendant with a view.
for (nsIFrame* f = GetParent();
f && !f->HasAnyStateBits(NS_FRAME_HAS_CHILD_WITH_VIEW);
f = f->GetParent()) {
f->AddStateBits(NS_FRAME_HAS_CHILD_WITH_VIEW);
}
} else {
MOZ_ASSERT_UNREACHABLE("Destroying a view while the frame is alive?");
RemoveStateBits(NS_FRAME_HAS_VIEW);
SetViewInternal(nullptr);
}
}
template <nsPoint (nsIFrame::*PositionGetter)() const>
static nsPoint OffsetCalculator(const nsIFrame* aThis, const nsIFrame* aOther) {
MOZ_ASSERT(aOther, "Must have frame for destination coordinate system!");
NS_ASSERTION(aThis->PresContext() == aOther->PresContext(),
"GetOffsetTo called on frames in different documents");
nsPoint offset(0, 0);
const nsIFrame* f;
for (f = aThis; f != aOther && f; f = f->GetParent()) {
offset += (f->*PositionGetter)();
}
if (f != aOther) {
// Looks like aOther wasn't an ancestor of |this|. So now we have
// the root-frame-relative position of |this| in |offset|. Convert back
// to the coordinates of aOther
while (aOther) {
offset -= (aOther->*PositionGetter)();
aOther = aOther->GetParent();
}
}
return offset;
}
nsPoint nsIFrame::GetOffsetTo(const nsIFrame* aOther) const {
return OffsetCalculator<&nsIFrame::GetPosition>(this, aOther);
}
nsPoint nsIFrame::GetOffsetToIgnoringScrolling(const nsIFrame* aOther) const {
return OffsetCalculator<&nsIFrame::GetPositionIgnoringScrolling>(this,
aOther);
}
nsPoint nsIFrame::GetOffsetToCrossDoc(const nsIFrame* aOther) const {
return GetOffsetToCrossDoc(aOther, PresContext()->AppUnitsPerDevPixel());
}
nsPoint nsIFrame::GetOffsetToCrossDoc(const nsIFrame* aOther,
const int32_t aAPD) const {
MOZ_ASSERT(aOther, "Must have frame for destination coordinate system!");
MOZ_DIAGNOSTIC_ASSERT(
PresContext()->GetRootPresContext() ==
aOther->PresContext()->GetRootPresContext(),
"trying to get the offset between frames in different document "
"hierarchies?");
const nsIFrame* root = nullptr;
// offset will hold the final offset
// docOffset holds the currently accumulated offset at the current APD, it
// will be converted and added to offset when the current APD changes.
nsPoint offset(0, 0), docOffset(0, 0);
const nsIFrame* f = this;
int32_t currAPD = PresContext()->AppUnitsPerDevPixel();
while (f && f != aOther) {
docOffset += f->GetPosition();
nsIFrame* parent = f->GetParent();
if (parent) {
f = parent;
} else {
nsPoint newOffset(0, 0);
root = f;
f = nsLayoutUtils::GetCrossDocParentFrameInProcess(f, &newOffset);
int32_t newAPD = f ? f->PresContext()->AppUnitsPerDevPixel() : 0;
if (!f || newAPD != currAPD) {
// Convert docOffset to the right APD and add it to offset.
offset += docOffset.ScaleToOtherAppUnits(currAPD, aAPD);
docOffset.x = docOffset.y = 0;
}
currAPD = newAPD;
docOffset += newOffset;
}
}
if (f == aOther) {
offset += docOffset.ScaleToOtherAppUnits(currAPD, aAPD);
} else {
// Looks like aOther wasn't an ancestor of |this|. So now we have
// the root-document-relative position of |this| in |offset|. Subtract the
// root-document-relative position of |aOther| from |offset|.
// This call won't try to recurse again because root is an ancestor of
// aOther.
nsPoint negOffset = aOther->GetOffsetToCrossDoc(root, aAPD);
offset -= negOffset;
}
return offset;
}
CSSIntRect nsIFrame::GetScreenRect() const {
return CSSIntRect::FromAppUnitsToNearest(GetScreenRectInAppUnits());
}
nsRect nsIFrame::GetScreenRectInAppUnits() const {
nsPresContext* presContext = PresContext();
nsIFrame* rootFrame = presContext->PresShell()->GetRootFrame();
nsPoint rootScreenPos(0, 0);
nsPoint rootFrameOffsetInParent(0, 0);
nsIFrame* rootFrameParent = nsLayoutUtils::GetCrossDocParentFrameInProcess(
rootFrame, &rootFrameOffsetInParent);
if (rootFrameParent) {
nsRect parentScreenRectAppUnits =
rootFrameParent->GetScreenRectInAppUnits();
nsPresContext* parentPresContext = rootFrameParent->PresContext();
double parentScale = double(presContext->AppUnitsPerDevPixel()) /
parentPresContext->AppUnitsPerDevPixel();
nsPoint rootPt =
parentScreenRectAppUnits.TopLeft() + rootFrameOffsetInParent;
rootScreenPos.x = NS_round(parentScale * rootPt.x);
rootScreenPos.y = NS_round(parentScale * rootPt.y);
} else {
nsCOMPtr<nsIWidget> rootWidget =
presContext->PresShell()->GetViewManager()->GetRootWidget();
if (rootWidget) {
LayoutDeviceIntPoint rootDevPx = rootWidget->WidgetToScreenOffset();
rootScreenPos.x = presContext->DevPixelsToAppUnits(rootDevPx.x);
rootScreenPos.y = presContext->DevPixelsToAppUnits(rootDevPx.y);
}
}
return nsRect(rootScreenPos + GetOffsetTo(rootFrame), GetSize());
}
// Returns the offset from this frame to the closest geometric parent that
// has a view. Also returns the containing view or null in case of error
void nsIFrame::GetOffsetFromView(nsPoint& aOffset, nsView** aView) const {
MOZ_ASSERT(nullptr != aView, "null OUT parameter pointer");
nsIFrame* frame = const_cast<nsIFrame*>(this);
*aView = nullptr;
aOffset.MoveTo(0, 0);
do {
aOffset += frame->GetPosition();
frame = frame->GetParent();
} while (frame && !frame->HasView());
if (frame) {
*aView = frame->GetView();
}
}
nsIWidget* nsIFrame::GetNearestWidget() const {
return GetClosestView()->GetNearestWidget(nullptr);
}
nsIWidget* nsIFrame::GetNearestWidget(nsPoint& aOffset) const {
nsPoint offsetToView;
nsPoint offsetToWidget;
nsIWidget* widget =
GetClosestView(&offsetToView)->GetNearestWidget(&offsetToWidget);
aOffset = offsetToView + offsetToWidget;
return widget;
}
Matrix4x4Flagged nsIFrame::GetTransformMatrix(ViewportType aViewportType,
RelativeTo aStopAtAncestor,
nsIFrame** aOutAncestor,
uint32_t aFlags) const {
MOZ_ASSERT(aOutAncestor, "Need a place to put the ancestor!");
/* If we're transformed, we want to hand back the combination
* transform/translate matrix that will apply our current transform, then
* shift us to our parent.
*/
const bool isTransformed = IsTransformed();
const nsIFrame* zoomedContentRoot = nullptr;
if (aStopAtAncestor.mViewportType == ViewportType::Visual) {
zoomedContentRoot = ViewportUtils::IsZoomedContentRoot(this);
if (zoomedContentRoot) {
MOZ_ASSERT(aViewportType != ViewportType::Visual);
}
}
if (isTransformed || zoomedContentRoot) {
MOZ_ASSERT(GetParent());
Matrix4x4Flagged result;
int32_t scaleFactor =
((aFlags & IN_CSS_UNITS) ? AppUnitsPerCSSPixel()
: PresContext()->AppUnitsPerDevPixel());
/* Compute the delta to the parent, which we need because we are converting
* coordinates to our parent.
*/
if (isTransformed) {
// Note: this converts from Matrix4x4 to Matrix4x4Flagged.
result = nsDisplayTransform::GetResultingTransformMatrix(
this, nsPoint(), scaleFactor,
nsDisplayTransform::INCLUDE_PERSPECTIVE);
}
// The offset from a zoomed content root to its parent (e.g. from
// a canvas frame to a scroll frame) is in layout coordinates, so
// apply it before applying any layout-to-visual transform.
*aOutAncestor = GetParent();
nsPoint delta = GetPosition();
/* Combine the raw transform with a translation to our parent. */
result.PostTranslate(NSAppUnitsToFloatPixels(delta.x, scaleFactor),
NSAppUnitsToFloatPixels(delta.y, scaleFactor), 0.0f);
if (zoomedContentRoot) {
Matrix4x4Flagged layoutToVisual;
if (aFlags & nsIFrame::IN_CSS_UNITS) {
layoutToVisual = ViewportUtils::GetVisualToLayoutTransform(
zoomedContentRoot->GetContent())
.Inverse()
.ToUnknownMatrix();
} else {
layoutToVisual =
ViewportUtils::GetVisualToLayoutTransform<LayoutDevicePixel>(
zoomedContentRoot->GetContent())
.Inverse()
.ToUnknownMatrix();
}
result = result * layoutToVisual;
}
return result;
}
// We are not transformed, so the returned transform is just going to be a
// translation up to whatever ancestor we decide to stop at.
nsPoint crossdocOffset;
*aOutAncestor =
nsLayoutUtils::GetCrossDocParentFrameInProcess(this, &crossdocOffset);
/* Otherwise, we're not transformed. In that case, we'll walk up the frame
* tree until we either hit the root frame or something that may be
* transformed. We'll then change coordinates into that frame, since we're
* guaranteed that nothing in-between can be transformed. First, however,
* we have to check to see if we have a parent. If not, we'll set the
* outparam to null (indicating that there's nothing left) and will hand back
* the identity matrix.
*/
if (!*aOutAncestor) {
return Matrix4x4Flagged();
}
/* Keep iterating while the frame can't possibly be transformed. */
const nsIFrame* current = this;
auto shouldStopAt = [](const nsIFrame* aCurrent, RelativeTo& aStopAtAncestor,
nsIFrame* aOutAncestor, uint32_t aFlags) {
return aOutAncestor->IsTransformed() ||
((aStopAtAncestor.mViewportType == ViewportType::Visual) &&
ViewportUtils::IsZoomedContentRoot(aOutAncestor)) ||
((aFlags & STOP_AT_STACKING_CONTEXT_AND_DISPLAY_PORT) &&
(aOutAncestor->IsStackingContext() ||
DisplayPortUtils::FrameHasDisplayPort(aOutAncestor, aCurrent)));
};
// We run the GetOffsetToCrossDoc code here as an optimization, instead of
// walking the parent chain here and then asking GetOffsetToCrossDoc to walk
// the same parent chain and compute the offset.
const int32_t finalAPD = PresContext()->AppUnitsPerDevPixel();
// offset accumulates the offset at finalAPD.
nsPoint offset = GetPosition();
int32_t currAPD = (*aOutAncestor)->PresContext()->AppUnitsPerDevPixel();
// docOffset accumulates the current offset at currAPD, and then flushes to
// offset at finalAPD when the APD changes or we finish.
nsPoint docOffset = crossdocOffset;
MOZ_ASSERT(crossdocOffset == nsPoint(0, 0) || !GetParent());
while (*aOutAncestor != aStopAtAncestor.mFrame &&
!shouldStopAt(current, aStopAtAncestor, *aOutAncestor, aFlags)) {
docOffset += (*aOutAncestor)->GetPosition();
nsIFrame* parent = (*aOutAncestor)->GetParent();
if (!parent) {
crossdocOffset.x = crossdocOffset.y = 0;
parent = nsLayoutUtils::GetCrossDocParentFrameInProcess(*aOutAncestor,
&crossdocOffset);
int32_t newAPD =
parent ? parent->PresContext()->AppUnitsPerDevPixel() : currAPD;
if (!parent || newAPD != currAPD) {
// Convert docOffset to finalAPD and add it to offset.
offset += docOffset.ScaleToOtherAppUnits(currAPD, finalAPD);
docOffset.x = docOffset.y = 0;
}
currAPD = newAPD;
docOffset += crossdocOffset;
if (!parent) {
break;
}
}
current = *aOutAncestor;
*aOutAncestor = parent;
}
offset += docOffset.ScaleToOtherAppUnits(currAPD, finalAPD);
NS_ASSERTION(*aOutAncestor, "Somehow ended up with a null ancestor...?");
int32_t scaleFactor =
((aFlags & IN_CSS_UNITS) ? AppUnitsPerCSSPixel()
: PresContext()->AppUnitsPerDevPixel());
return Matrix4x4Flagged::Translation2d(
NSAppUnitsToFloatPixels(offset.x, scaleFactor),
NSAppUnitsToFloatPixels(offset.y, scaleFactor));
}
static void InvalidateRenderingObservers(nsIFrame* aDisplayRoot,
nsIFrame* aFrame,
bool aFrameChanged = true) {
MOZ_ASSERT(aDisplayRoot == nsLayoutUtils::GetDisplayRootFrame(aFrame));
SVGObserverUtils::InvalidateDirectRenderingObservers(aFrame);
nsIFrame* parent = aFrame;
while (parent != aDisplayRoot &&
(parent = nsLayoutUtils::GetCrossDocParentFrameInProcess(parent)) &&
!parent->HasAnyStateBits(NS_FRAME_DESCENDANT_NEEDS_PAINT)) {
SVGObserverUtils::InvalidateDirectRenderingObservers(parent);
}
if (!aFrameChanged) {
return;
}
aFrame->MarkNeedsDisplayItemRebuild();
}
static void SchedulePaintInternal(
nsIFrame* aDisplayRoot, nsIFrame* aFrame,
nsIFrame::PaintType aType = nsIFrame::PAINT_DEFAULT) {
MOZ_ASSERT(aDisplayRoot == nsLayoutUtils::GetDisplayRootFrame(aFrame));
nsPresContext* pres = aDisplayRoot->PresContext()->GetRootPresContext();
// No need to schedule a paint for an external document since they aren't
// painted directly.
if (!pres || (pres->Document() && pres->Document()->IsResourceDoc())) {
return;
}
if (!pres->GetContainerWeak()) {
NS_WARNING("Shouldn't call SchedulePaint in a detached pres context");
return;
}
pres->PresShell()->ScheduleViewManagerFlush();
if (aType == nsIFrame::PAINT_DEFAULT) {
aDisplayRoot->AddStateBits(NS_FRAME_UPDATE_LAYER_TREE);
}
}
static void InvalidateFrameInternal(nsIFrame* aFrame, bool aHasDisplayItem,
bool aRebuildDisplayItems) {
if (aHasDisplayItem) {
aFrame->AddStateBits(NS_FRAME_NEEDS_PAINT);
}
if (aRebuildDisplayItems) {
aFrame->MarkNeedsDisplayItemRebuild();
}
SVGObserverUtils::InvalidateDirectRenderingObservers(aFrame);
bool needsSchedulePaint = false;
if (nsLayoutUtils::IsPopup(aFrame)) {
needsSchedulePaint = true;
} else {
nsIFrame* parent = nsLayoutUtils::GetCrossDocParentFrameInProcess(aFrame);
while (parent &&
!parent->HasAnyStateBits(NS_FRAME_DESCENDANT_NEEDS_PAINT)) {
if (aHasDisplayItem && !parent->HasAnyStateBits(NS_FRAME_IS_NONDISPLAY)) {
parent->AddStateBits(NS_FRAME_DESCENDANT_NEEDS_PAINT);
}
SVGObserverUtils::InvalidateDirectRenderingObservers(parent);
// If we're inside a popup, then we need to make sure that we
// call schedule paint so that the NS_FRAME_UPDATE_LAYER_TREE
// flag gets added to the popup display root frame.
if (nsLayoutUtils::IsPopup(parent)) {
needsSchedulePaint = true;
break;
}
parent = nsLayoutUtils::GetCrossDocParentFrameInProcess(parent);
}
if (!parent) {
needsSchedulePaint = true;
}
}
if (!aHasDisplayItem) {
return;
}
if (needsSchedulePaint) {
nsIFrame* displayRoot = nsLayoutUtils::GetDisplayRootFrame(aFrame);
SchedulePaintInternal(displayRoot, aFrame);
}
if (aFrame->HasAnyStateBits(NS_FRAME_HAS_INVALID_RECT)) {
aFrame->RemoveProperty(nsIFrame::InvalidationRect());
aFrame->RemoveStateBits(NS_FRAME_HAS_INVALID_RECT);
}
}
void nsIFrame::InvalidateFrameSubtree(bool aRebuildDisplayItems /* = true */) {
InvalidateFrame(0, aRebuildDisplayItems);
if (HasAnyStateBits(NS_FRAME_ALL_DESCENDANTS_NEED_PAINT)) {
return;
}
AddStateBits(NS_FRAME_ALL_DESCENDANTS_NEED_PAINT);
for (const auto& childList : CrossDocChildLists()) {
for (nsIFrame* child : childList.mList) {
// Don't explicitly rebuild display items for our descendants,
// since we should be marked and it implicitly includes all
// descendants.
child->InvalidateFrameSubtree(false);
}
}
}
void nsIFrame::ClearInvalidationStateBits() {
if (HasAnyStateBits(NS_FRAME_DESCENDANT_NEEDS_PAINT)) {
for (const auto& childList : CrossDocChildLists()) {
for (nsIFrame* child : childList.mList) {
child->ClearInvalidationStateBits();
}
}
}
RemoveStateBits(NS_FRAME_NEEDS_PAINT | NS_FRAME_DESCENDANT_NEEDS_PAINT |
NS_FRAME_ALL_DESCENDANTS_NEED_PAINT);
}
bool HasRetainedDataFor(const nsIFrame* aFrame, uint32_t aDisplayItemKey) {
if (RefPtr<WebRenderUserData> data =
GetWebRenderUserData<WebRenderFallbackData>(aFrame,
aDisplayItemKey)) {
return true;
}
return false;
}
void nsIFrame::InvalidateFrame(uint32_t aDisplayItemKey,
bool aRebuildDisplayItems /* = true */) {
bool hasDisplayItem =
!aDisplayItemKey || HasRetainedDataFor(this, aDisplayItemKey);
InvalidateFrameInternal(this, hasDisplayItem, aRebuildDisplayItems);
}
void nsIFrame::InvalidateFrameWithRect(const nsRect& aRect,
uint32_t aDisplayItemKey,
bool aRebuildDisplayItems /* = true */) {
if (aRect.IsEmpty()) {
return;
}
bool hasDisplayItem =
!aDisplayItemKey || HasRetainedDataFor(this, aDisplayItemKey);
bool alreadyInvalid = false;
if (!HasAnyStateBits(NS_FRAME_NEEDS_PAINT)) {
InvalidateFrameInternal(this, hasDisplayItem, aRebuildDisplayItems);
} else {
alreadyInvalid = true;
}
if (!hasDisplayItem) {
return;
}
nsRect* rect;
if (HasAnyStateBits(NS_FRAME_HAS_INVALID_RECT)) {
rect = GetProperty(InvalidationRect());
MOZ_ASSERT(rect);
} else {
if (alreadyInvalid) {
return;
}
rect = new nsRect();
AddProperty(InvalidationRect(), rect);
AddStateBits(NS_FRAME_HAS_INVALID_RECT);
}
*rect = rect->Union(aRect);
}
bool nsIFrame::IsInvalid(nsRect& aRect) {
if (!HasAnyStateBits(NS_FRAME_NEEDS_PAINT)) {
return false;
}
if (HasAnyStateBits(NS_FRAME_HAS_INVALID_RECT)) {
nsRect* rect = GetProperty(InvalidationRect());
NS_ASSERTION(
rect, "Must have an invalid rect if NS_FRAME_HAS_INVALID_RECT is set!");
aRect = *rect;
} else {
aRect.SetEmpty();
}
return true;
}
void nsIFrame::SchedulePaint(PaintType aType, bool aFrameChanged) {
if (PresShell()->IsPaintingSuppressed()) {
// We can't have any display items yet, and when we unsuppress we will
// invalidate the root frame.
return;
}
nsIFrame* displayRoot = nsLayoutUtils::GetDisplayRootFrame(this);
InvalidateRenderingObservers(displayRoot, this, aFrameChanged);
SchedulePaintInternal(displayRoot, this, aType);
}
void nsIFrame::SchedulePaintWithoutInvalidatingObservers(PaintType aType) {
nsIFrame* displayRoot = nsLayoutUtils::GetDisplayRootFrame(this);
SchedulePaintInternal(displayRoot, this, aType);
}
void nsIFrame::InvalidateLayer(DisplayItemType aDisplayItemKey,
const nsIntRect* aDamageRect,
const nsRect* aFrameDamageRect,
uint32_t aFlags /* = 0 */) {
NS_ASSERTION(aDisplayItemKey > DisplayItemType::TYPE_ZERO, "Need a key");
nsIFrame* displayRoot = nsLayoutUtils::GetDisplayRootFrame(this);
InvalidateRenderingObservers(displayRoot, this, false);
// Check if frame supports WebRender's async update
if ((aFlags & UPDATE_IS_ASYNC) &&
WebRenderUserData::SupportsAsyncUpdate(this)) {
// WebRender does not use layer, then return nullptr.
return;
}
if (aFrameDamageRect && aFrameDamageRect->IsEmpty()) {
return;
}
// screen because sometimes we don't have any retainned data
// for remote type displayitem and thus Repaint event is not
// triggered. So, always invalidate in this case.
DisplayItemType displayItemKey = aDisplayItemKey;
if (aDisplayItemKey == DisplayItemType::TYPE_REMOTE) {
displayItemKey = DisplayItemType::TYPE_ZERO;
}
if (aFrameDamageRect) {
InvalidateFrameWithRect(*aFrameDamageRect,
static_cast<uint32_t>(displayItemKey));
} else {
InvalidateFrame(static_cast<uint32_t>(displayItemKey));
}
}
static nsRect ComputeEffectsRect(nsIFrame* aFrame, const nsRect& aOverflowRect,
const nsSize& aNewSize) {
nsRect r = aOverflowRect;
if (aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
// For SVG frames, we only need to account for filters.
// TODO: We could also take account of clipPath and mask to reduce the
// ink overflow, but that's not essential.
if (aFrame->StyleEffects()->HasFilters()) {
SetOrUpdateRectValuedProperty(aFrame, nsIFrame::PreEffectsBBoxProperty(),
r);
r = SVGUtils::GetPostFilterInkOverflowRect(aFrame, aOverflowRect);
}
return r;
}
// box-shadow
r.UnionRect(r, nsLayoutUtils::GetBoxShadowRectForFrame(aFrame, aNewSize));
// border-image-outset.
// We need to include border-image-outset because it can cause the
// border image to be drawn beyond the border box.
// (1) It's important we not check whether there's a border-image
// since the style hint for a change in border image doesn't cause
// reflow, and that's probably more important than optimizing the
// overflow areas for the silly case of border-image-outset without
// border-image
// (2) It's important that we not check whether the border-image
// is actually loaded, since that would require us to reflow when
// the image loads.
const nsStyleBorder* styleBorder = aFrame->StyleBorder();
nsMargin outsetMargin = styleBorder->GetImageOutset();
if (outsetMargin != nsMargin(0, 0, 0, 0)) {
nsRect outsetRect(nsPoint(0, 0), aNewSize);
outsetRect.Inflate(outsetMargin);
r.UnionRect(r, outsetRect);
}
// Note that we don't remove the outlineInnerRect if a frame loses outline
// style. That would require an extra property lookup for every frame,
// or a new frame state bit to track whether a property had been stored,
// or something like that. It's not worth doing that here. At most it's
// only one heap-allocated rect per frame and it will be cleaned up when
// the frame dies.
if (SVGIntegrationUtils::UsingOverflowAffectingEffects(aFrame)) {
SetOrUpdateRectValuedProperty(aFrame, nsIFrame::PreEffectsBBoxProperty(),
r);
r = SVGIntegrationUtils::ComputePostEffectsInkOverflowRect(aFrame, r);
}
return r;
}
void nsIFrame::SetPosition(const nsPoint& aPt) {
if (mRect.TopLeft() == aPt) {
return;
}
mRect.MoveTo(aPt);
MarkNeedsDisplayItemRebuild();
}
void nsIFrame::MovePositionBy(const nsPoint& aTranslation) {
nsPoint position = GetNormalPosition() + aTranslation;
const nsMargin* computedOffsets = nullptr;
if (IsRelativelyOrStickyPositioned()) {
computedOffsets = GetProperty(nsIFrame::ComputedOffsetProperty());
}
ReflowInput::ApplyRelativePositioning(
this, computedOffsets ? *computedOffsets : nsMargin(), &position);
SetPosition(position);
}
nsRect nsIFrame::GetNormalRect() const {
// It might be faster to first check
// StyleDisplay()->IsRelativelyPositionedStyle().
bool hasProperty;
nsPoint normalPosition = GetProperty(NormalPositionProperty(), &hasProperty);
if (hasProperty) {
return nsRect(normalPosition, GetSize());
}
return GetRect();
}
nsRect nsIFrame::GetBoundingClientRect() {
return nsLayoutUtils::GetAllInFlowRectsUnion(
this, nsLayoutUtils::GetContainingBlockForClientRect(this),
nsLayoutUtils::GetAllInFlowRectsFlag::AccountForTransforms);
}
nsPoint nsIFrame::GetPositionIgnoringScrolling() const {
return GetParent() ? GetParent()->GetPositionOfChildIgnoringScrolling(this)
: GetPosition();
}
nsRect nsIFrame::GetOverflowRect(OverflowType aType) const {
// Note that in some cases the overflow area might not have been
// updated (yet) to reflect any outline set on the frame or the area
// of child frames. That's OK because any reflow that updates these
// areas will invalidate the appropriate area, so any (mis)uses of
// this method will be fixed up.
if (mOverflow.mType == OverflowStorageType::Large) {
// there is an overflow rect, and it's not stored as deltas but as
// a separately-allocated rect
return GetOverflowAreasProperty()->Overflow(aType);
}
if (aType == OverflowType::Ink &&
mOverflow.mType != OverflowStorageType::None) {
return InkOverflowFromDeltas();
}
return GetRectRelativeToSelf();
}
OverflowAreas nsIFrame::GetOverflowAreas() const {
if (mOverflow.mType == OverflowStorageType::Large) {
// there is an overflow rect, and it's not stored as deltas but as
// a separately-allocated rect
return *GetOverflowAreasProperty();
}
return OverflowAreas(InkOverflowFromDeltas(),
nsRect(nsPoint(0, 0), GetSize()));
}
OverflowAreas nsIFrame::GetOverflowAreasRelativeToSelf() const {
if (IsTransformed()) {
if (OverflowAreas* preTransformOverflows =
GetProperty(PreTransformOverflowAreasProperty())) {
return *preTransformOverflows;
}
}
return GetOverflowAreas();
}
OverflowAreas nsIFrame::GetOverflowAreasRelativeToParent() const {
return GetOverflowAreas() + GetPosition();
}
OverflowAreas nsIFrame::GetActualAndNormalOverflowAreasRelativeToParent()
const {
if (MOZ_LIKELY(!IsRelativelyOrStickyPositioned())) {
return GetOverflowAreasRelativeToParent();
}
const OverflowAreas overflows = GetOverflowAreas();
OverflowAreas actualAndNormalOverflows = overflows + GetNormalPosition();
if (IsRelativelyPositioned()) {
actualAndNormalOverflows.UnionWith(overflows + GetPosition());
} else {
// For sticky positioned elements, we only use the normal position for the
// scrollable overflow. This avoids circular dependencies between sticky
// positioned elements and their scroll container. (The scroll position and
// the scroll container's size impact the sticky position, so we don't want
// the sticky position to impact them.)
MOZ_ASSERT(IsStickyPositioned());
actualAndNormalOverflows.UnionWith(
OverflowAreas(overflows.InkOverflow() + GetPosition(), nsRect()));
}
return actualAndNormalOverflows;
}
nsRect nsIFrame::ScrollableOverflowRectRelativeToParent() const {
return ScrollableOverflowRect() + GetPosition();
}
nsRect nsIFrame::InkOverflowRectRelativeToParent() const {
return InkOverflowRect() + GetPosition();
}
nsRect nsIFrame::ScrollableOverflowRectRelativeToSelf() const {
if (IsTransformed()) {
if (OverflowAreas* preTransformOverflows =
GetProperty(PreTransformOverflowAreasProperty())) {
return preTransformOverflows->ScrollableOverflow();
}
}
return ScrollableOverflowRect();
}
nsRect nsIFrame::InkOverflowRectRelativeToSelf() const {
if (IsTransformed()) {
if (OverflowAreas* preTransformOverflows =
GetProperty(PreTransformOverflowAreasProperty())) {
return preTransformOverflows->InkOverflow();
}
}
return InkOverflowRect();
}
nsRect nsIFrame::PreEffectsInkOverflowRect() const {
nsRect* r = GetProperty(nsIFrame::PreEffectsBBoxProperty());
return r ? *r : InkOverflowRectRelativeToSelf();
}
bool nsIFrame::UpdateOverflow() {
MOZ_ASSERT(FrameMaintainsOverflow(),
"Non-display SVG do not maintain ink overflow rects");
nsRect rect(nsPoint(0, 0), GetSize());
OverflowAreas overflowAreas(rect, rect);
if (!ComputeCustomOverflow(overflowAreas)) {
// If updating overflow wasn't supported by this frame, then it should
// have scheduled any necessary reflows. We can return false to say nothing
// changed, and wait for reflow to correct it.
return false;
}
UnionChildOverflow(overflowAreas);
if (FinishAndStoreOverflow(overflowAreas, GetSize())) {
if (nsView* view = GetView()) {
// Make sure the frame's view is properly sized.
nsViewManager* vm = view->GetViewManager();
vm->ResizeView(view, overflowAreas.InkOverflow());
}
return true;
}
// Frames that combine their 3d transform with their ancestors
// only compute a pre-transform overflow rect, and then contribute
// to the normal overflow rect of the preserve-3d root. Always return
// true here so that we propagate changes up to the root for final
// calculation.
return Combines3DTransformWithAncestors();
}
/* virtual */
bool nsIFrame::ComputeCustomOverflow(OverflowAreas& aOverflowAreas) {
return true;
}
bool nsIFrame::DoesClipChildrenInBothAxes() const {
if (IsScrollContainerOrSubclass()) {
return true;
}
const nsStyleDisplay* display = StyleDisplay();
if (display->IsContainPaint() && SupportsContainLayoutAndPaint()) {
return true;
}
return display->mOverflowX == StyleOverflow::Clip &&
display->mOverflowY == StyleOverflow::Clip;
}
/* virtual */
void nsIFrame::UnionChildOverflow(OverflowAreas& aOverflowAreas,
bool aAsIfScrolled) {
if (aAsIfScrolled || !DoesClipChildrenInBothAxes()) {
nsLayoutUtils::UnionChildOverflow(this, aOverflowAreas);
}
}
// Return true if this form control element's preferred size property (but not
// percentage max size property) contains a percentage value that should be
// resolved against zero when calculating its min-content contribution in the
// corresponding axis.
//
// For proper replaced elements, the percentage value in both their max size
// property or preferred size property should be resolved against zero. This is
// handled in IsPercentageResolvedAgainstZero().
inline static bool FormControlShrinksForPercentSize(const nsIFrame* aFrame) {
if (!aFrame->IsReplaced()) {
// Quick test to reject most frames.
return false;
}
switch (aFrame->Type()) {
case LayoutFrameType::Meter:
case LayoutFrameType::Progress:
case LayoutFrameType::Range:
case LayoutFrameType::TextInput:
case LayoutFrameType::ColorControl:
case LayoutFrameType::ComboboxControl:
case LayoutFrameType::ListControl:
case LayoutFrameType::CheckboxRadio:
case LayoutFrameType::FileControl:
case LayoutFrameType::ImageControl:
return true;
default:
// Buttons (GfxButtonControl / HTMLButtonControl) don't have this
// shrinking behavior. (Note that color inputs do, even though they
// inherit from button, so we can't use do_QueryFrame here.)
return false;
}
}
bool nsIFrame::IsPercentageResolvedAgainstZero(
const StyleSize& aStyleSize, const StyleMaxSize& aStyleMaxSize) const {
const bool sizeHasPercent = aStyleSize.HasPercent();
return ((sizeHasPercent || aStyleMaxSize.HasPercent()) &&
HasReplacedSizing()) ||
(sizeHasPercent && FormControlShrinksForPercentSize(this));
}
// Summary of the Cyclic-Percentage Intrinsic Size Contribution Rules:
//
// Element Type | Replaced | Non-replaced
// Contribution Type | min-content max-content | min-content max-content
// ---------------------------------------------------------------------------
// min size | zero zero | zero zero
// max & preferred size | zero initial | initial initial
//
bool nsIFrame::IsPercentageResolvedAgainstZero(const LengthPercentage& aSize,
SizeProperty aProperty) const {
// Early return to avoid calling the virtual function, IsFrameOfType().
if (aProperty == SizeProperty::MinSize) {
return true;
}
const bool hasPercentOnReplaced = aSize.HasPercent() && HasReplacedSizing();
if (aProperty == SizeProperty::MaxSize) {
return hasPercentOnReplaced;
}
MOZ_ASSERT(aProperty == SizeProperty::Size);
return hasPercentOnReplaced ||
(aSize.HasPercent() && FormControlShrinksForPercentSize(this));
}
bool nsIFrame::IsBlockWrapper() const {
auto pseudoType = Style()->GetPseudoType();
return pseudoType == PseudoStyleType::mozBlockInsideInlineWrapper ||
pseudoType == PseudoStyleType::buttonContent ||
pseudoType == PseudoStyleType::cellContent ||
pseudoType == PseudoStyleType::columnSpanWrapper;
}
bool nsIFrame::IsBlockFrameOrSubclass() const {
const nsBlockFrame* thisAsBlock = do_QueryFrame(this);
return !!thisAsBlock;
}
bool nsIFrame::IsImageFrameOrSubclass() const {
const nsImageFrame* asImage = do_QueryFrame(this);
return !!asImage;
}
bool nsIFrame::IsScrollContainerOrSubclass() const {
const bool result = IsScrollContainerFrame() || IsListControlFrame();
MOZ_ASSERT(result == !!QueryFrame(ScrollContainerFrame::kFrameIID));
return result;
}
bool nsIFrame::IsSubgrid() const {
return IsGridContainerFrame() &&
static_cast<const nsGridContainerFrame*>(this)->IsSubgrid();
}
static nsIFrame* GetNearestBlockContainer(nsIFrame* frame) {
while (!frame->IsBlockContainer()) {
frame = frame->GetParent();
NS_ASSERTION(
frame,
"How come we got to the root frame without seeing a containing block?");
}
return frame;
}
bool nsIFrame::IsBlockContainer() const {
// The block wrappers we use to wrap blocks inside inlines aren't
// described in the CSS spec. We need to make them not be containing
// blocks.
// Since the parent of such a block is either a normal block or
// another such pseudo, this shouldn't cause anything bad to happen.
// Also the anonymous blocks inside table cells are not containing blocks.
//
// If we ever start skipping table row groups from being containing blocks,
return !IsLineParticipant() && !IsBlockWrapper() && !IsSubgrid() &&
// Table rows are not containing blocks either
!IsTableRowFrame();
}
nsIFrame* nsIFrame::GetContainingBlock(
uint32_t aFlags, const nsStyleDisplay* aStyleDisplay) const {
MOZ_ASSERT(aStyleDisplay == StyleDisplay());
// Keep this in sync with MightBeContainingBlockFor in ReflowInput.cpp.
if (!GetParent()) {
return nullptr;
}
// MathML frames might have absolute positioning style, but they would
// still be in-flow. So we have to check to make sure that the frame
// is really out-of-flow too.
nsIFrame* f;
if (IsAbsolutelyPositioned(aStyleDisplay)) {
f = GetParent(); // the parent is always the containing block
} else {
f = GetNearestBlockContainer(GetParent());
}
if (aFlags & SKIP_SCROLLED_FRAME && f &&
f->Style()->GetPseudoType() == PseudoStyleType::scrolledContent) {
f = f->GetParent();
}
return f;
}
#ifdef DEBUG_FRAME_DUMP
Maybe<uint32_t> nsIFrame::ContentIndexInContainer(const nsIFrame* aFrame) {
if (nsIContent* content = aFrame->GetContent()) {
return content->ComputeIndexInParentContent();
}
return Nothing();
}
nsAutoCString nsIFrame::ListTag() const {
nsAutoString tmp;
GetFrameName(tmp);
nsAutoCString tag;
tag += NS_ConvertUTF16toUTF8(tmp);
tag += nsPrintfCString("@%p", static_cast<const void*>(this));
return tag;
}
std::string nsIFrame::ConvertToString(const LogicalRect& aRect,
const WritingMode aWM, ListFlags aFlags) {
if (aFlags.contains(ListFlag::DisplayInCSSPixels)) {
// Abuse CSSRect to store all LogicalRect's dimensions in CSS pixels.
return ToString(mozilla::CSSRect(CSSPixel::FromAppUnits(aRect.IStart(aWM)),
CSSPixel::FromAppUnits(aRect.BStart(aWM)),
CSSPixel::FromAppUnits(aRect.ISize(aWM)),
CSSPixel::FromAppUnits(aRect.BSize(aWM))));
}
return ToString(aRect);
}
std::string nsIFrame::ConvertToString(const LogicalSize& aSize,
const WritingMode aWM, ListFlags aFlags) {
if (aFlags.contains(ListFlag::DisplayInCSSPixels)) {
// Abuse CSSSize to store all LogicalSize's dimensions in CSS pixels.
return ToString(CSSSize(CSSPixel::FromAppUnits(aSize.ISize(aWM)),
CSSPixel::FromAppUnits(aSize.BSize(aWM))));
}
return ToString(aSize);
}
// Debugging
void nsIFrame::ListGeneric(nsACString& aTo, const char* aPrefix,
ListFlags aFlags) const {
aTo += aPrefix;
aTo += ListTag();
if (HasView()) {
aTo += nsPrintfCString(" [view=%p]", static_cast<void*>(GetView()));
}
if (GetParent()) {
aTo += nsPrintfCString(" parent=%p", static_cast<void*>(GetParent()));
}
if (GetNextSibling()) {
aTo += nsPrintfCString(" next=%p", static_cast<void*>(GetNextSibling()));
}
if (GetPrevContinuation()) {
bool fluid = GetPrevInFlow() == GetPrevContinuation();
aTo += nsPrintfCString(" prev-%s=%p", fluid ? "in-flow" : "continuation",
static_cast<void*>(GetPrevContinuation()));
}
if (GetNextContinuation()) {
bool fluid = GetNextInFlow() == GetNextContinuation();
aTo += nsPrintfCString(" next-%s=%p", fluid ? "in-flow" : "continuation",
static_cast<void*>(GetNextContinuation()));
}
if (const nsAtom* const autoPageValue =
GetProperty(AutoPageValueProperty())) {
aTo += " AutoPage=";
aTo += nsAtomCString(autoPageValue);
}
if (const nsIFrame::PageValues* const pageValues =
GetProperty(PageValuesProperty())) {
aTo += " PageValues={";
if (pageValues->mStartPageValue) {
aTo += nsAtomCString(pageValues->mStartPageValue);
} else {
aTo += "<null>";
}
aTo += ", ";
if (pageValues->mEndPageValue) {
aTo += nsAtomCString(pageValues->mEndPageValue);
} else {
aTo += "<null>";
}
aTo += "}";
}
void* IBsibling = GetProperty(IBSplitSibling());
if (IBsibling) {
aTo += nsPrintfCString(" IBSplitSibling=%p", IBsibling);
}
void* IBprevsibling = GetProperty(IBSplitPrevSibling());
if (IBprevsibling) {
aTo += nsPrintfCString(" IBSplitPrevSibling=%p", IBprevsibling);
}
if (nsLayoutUtils::FontSizeInflationEnabled(PresContext())) {
if (HasAnyStateBits(NS_FRAME_FONT_INFLATION_FLOW_ROOT)) {
aTo += nsPrintfCString(" FFR");
if (nsFontInflationData* data =
nsFontInflationData::FindFontInflationDataFor(this)) {
aTo += nsPrintfCString(
",enabled=%s,UIS=%s", data->InflationEnabled() ? "yes" : "no",
ConvertToString(data->UsableISize(), aFlags).c_str());
}
}
if (HasAnyStateBits(NS_FRAME_FONT_INFLATION_CONTAINER)) {
aTo += nsPrintfCString(" FIC");
}
aTo += nsPrintfCString(" FI=%f", nsLayoutUtils::FontSizeInflationFor(this));
}
aTo += nsPrintfCString(" %s", ConvertToString(mRect, aFlags).c_str());
mozilla::WritingMode wm = GetWritingMode();
if (wm.IsVertical() || wm.IsBidiRTL()) {
aTo +=
nsPrintfCString(" wm=%s logical-size=(%s)", ToString(wm).c_str(),
ConvertToString(GetLogicalSize(), wm, aFlags).c_str());
}
nsIFrame* parent = GetParent();
if (parent) {
WritingMode pWM = parent->GetWritingMode();
if (pWM.IsVertical() || pWM.IsBidiRTL()) {
nsSize containerSize = parent->mRect.Size();
LogicalRect lr(pWM, mRect, containerSize);
aTo += nsPrintfCString(" parent-wm=%s cs=(%s) logical-rect=%s",
ToString(pWM).c_str(),
ConvertToString(containerSize, aFlags).c_str(),
ConvertToString(lr, pWM, aFlags).c_str());
}
}
nsIFrame* f = const_cast<nsIFrame*>(this);
if (f->HasOverflowAreas()) {
nsRect io = f->InkOverflowRect();
if (!io.IsEqualEdges(mRect)) {
aTo += nsPrintfCString(" ink-overflow=%s",
ConvertToString(io, aFlags).c_str());
}
nsRect so = f->ScrollableOverflowRect();
if (!so.IsEqualEdges(mRect)) {
aTo += nsPrintfCString(" scr-overflow=%s",
ConvertToString(so, aFlags).c_str());
}
}
if (OverflowAreas* preTransformOverflows =
f->GetProperty(PreTransformOverflowAreasProperty())) {
nsRect io = preTransformOverflows->InkOverflow();
if (!io.IsEqualEdges(mRect) &&
(!f->HasOverflowAreas() || !io.IsEqualEdges(f->InkOverflowRect()))) {
aTo += nsPrintfCString(" pre-transform-ink-overflow=%s",
ConvertToString(io, aFlags).c_str());
}
nsRect so = preTransformOverflows->ScrollableOverflow();
if (!so.IsEqualEdges(mRect) &&
(!f->HasOverflowAreas() ||
!so.IsEqualEdges(f->ScrollableOverflowRect()))) {
aTo += nsPrintfCString(" pre-transform-scr-overflow=%s",
ConvertToString(so, aFlags).c_str());
}
}
bool hasNormalPosition;
nsPoint normalPosition = GetNormalPosition(&hasNormalPosition);
if (hasNormalPosition) {
aTo += nsPrintfCString(" normal-position=%s",
ConvertToString(normalPosition, aFlags).c_str());
}
if (HasProperty(BidiDataProperty())) {
FrameBidiData bidi = GetBidiData();
aTo += nsPrintfCString(" bidi(%d,%d,%d)", bidi.baseLevel.Value(),
bidi.embeddingLevel.Value(),
bidi.precedingControl.Value());
}
if (IsTransformed()) {
aTo += nsPrintfCString(" transformed");
}
if (ChildrenHavePerspective()) {
aTo += nsPrintfCString(" perspective");
}
if (Extend3DContext()) {
aTo += nsPrintfCString(" extend-3d");
}
if (Combines3DTransformWithAncestors()) {
aTo += nsPrintfCString(" combines-3d-transform-with-ancestors");
}
if (mContent) {
aTo += nsPrintfCString(" [content=%p]", static_cast<void*>(mContent));
}
aTo += nsPrintfCString(" [cs=%p", static_cast<void*>(mComputedStyle));
if (mComputedStyle) {
auto pseudoType = mComputedStyle->GetPseudoType();
aTo += ToString(pseudoType).c_str();
}
aTo += "]";
auto contentVisibility = StyleDisplay()->ContentVisibility(*this);
if (contentVisibility != StyleContentVisibility::Visible) {
aTo += nsPrintfCString(" [content-visibility=");
if (contentVisibility == StyleContentVisibility::Auto) {
aTo += "auto, "_ns;
} else if (contentVisibility == StyleContentVisibility::Hidden) {
aTo += "hidden, "_ns;
}
if (HidesContent()) {
aTo += "HidesContent=hidden"_ns;
} else {
aTo += "HidesContent=visibile"_ns;
}
aTo += "]";
}
if (IsFrameModified()) {
aTo += nsPrintfCString(" modified");
}
if (HasModifiedDescendants()) {
aTo += nsPrintfCString(" has-modified-descendants");
}
}
void nsIFrame::List(FILE* out, const char* aPrefix, ListFlags aFlags) const {
nsCString str;
ListGeneric(str, aPrefix, aFlags);
fprintf_stderr(out, "%s\n", str.get());
}
void nsIFrame::ListTextRuns(FILE* out) const {
nsTHashSet<const void*> seen;
ListTextRuns(out, seen);
}
void nsIFrame::ListTextRuns(FILE* out, nsTHashSet<const void*>& aSeen) const {
for (const auto& childList : ChildLists()) {
for (const nsIFrame* kid : childList.mList) {
kid->ListTextRuns(out, aSeen);
}
}
}
void nsIFrame::ListMatchedRules(FILE* out, const char* aPrefix) const {
nsTArray<const StyleLockedDeclarationBlock*> rawDecls;
Servo_ComputedValues_GetMatchingDeclarations(Style(), &rawDecls);
for (const StyleLockedDeclarationBlock* rawRule : rawDecls) {
nsAutoCString ruleText;
Servo_DeclarationBlock_GetCssText(rawRule, &ruleText);
fprintf_stderr(out, "%s%s\n", aPrefix, ruleText.get());
}
}
void nsIFrame::ListWithMatchedRules(FILE* out, const char* aPrefix) const {
fprintf_stderr(out, "%s%s\n", aPrefix, ListTag().get());
nsCString rulePrefix;
rulePrefix += aPrefix;
rulePrefix += " ";
ListMatchedRules(out, rulePrefix.get());
}
nsresult nsIFrame::GetFrameName(nsAString& aResult) const {
return MakeFrameName(u"Frame"_ns, aResult);
}
nsresult nsIFrame::MakeFrameName(const nsAString& aType,
nsAString& aResult) const {
aResult = aType;
if (mContent && !mContent->IsText()) {
nsAutoString buf;
mContent->NodeInfo()->NameAtom()->ToString(buf);
if (nsAtom* id = mContent->GetID()) {
buf.AppendLiteral(" id=");
buf.Append(nsDependentAtomString(id));
}
if (IsSubDocumentFrame()) {
nsAutoString src;
mContent->AsElement()->GetAttr(nsGkAtoms::src, src);
buf.AppendLiteral(" src=");
buf.Append(src);
}
aResult.Append('(');
aResult.Append(buf);
aResult.Append(')');
}
aResult.Append('(');
Maybe<uint32_t> index = ContentIndexInContainer(this);
if (index.isSome()) {
aResult.AppendInt(*index);
} else {
aResult.AppendInt(-1);
}
aResult.Append(')');
return NS_OK;
}
void nsIFrame::DumpFrameTree() const {
PresShell()->GetRootFrame()->List(stderr);
}
void nsIFrame::DumpFrameTreeInCSSPixels() const {
PresShell()->GetRootFrame()->List(stderr, "", ListFlag::DisplayInCSSPixels);
}
void nsIFrame::DumpFrameTreeLimited() const { List(stderr); }
void nsIFrame::DumpFrameTreeLimitedInCSSPixels() const {
List(stderr, "", ListFlag::DisplayInCSSPixels);
}
#endif
bool nsIFrame::IsVisibleForPainting() const {
return StyleVisibility()->IsVisible();
}
bool nsIFrame::IsVisibleOrCollapsedForPainting() const {
return StyleVisibility()->IsVisibleOrCollapsed();
}
/* virtual */
bool nsIFrame::IsEmpty() {
return IsHiddenByContentVisibilityOfInFlowParentForLayout();
}
bool nsIFrame::CachedIsEmpty() {
MOZ_ASSERT(!HasAnyStateBits(NS_FRAME_IS_DIRTY) ||
IsHiddenByContentVisibilityOfInFlowParentForLayout(),
"Must only be called on reflowed lines or those hidden by "
"content-visibility.");
return IsEmpty();
}
/* virtual */
bool nsIFrame::IsSelfEmpty() {
return IsHiddenByContentVisibilityOfInFlowParentForLayout();
}
nsresult nsIFrame::GetSelectionController(nsPresContext* aPresContext,
nsISelectionController** aSelCon) {
if (!aPresContext || !aSelCon) {
return NS_ERROR_INVALID_ARG;
}
nsIFrame* frame = this;
while (frame && frame->HasAnyStateBits(NS_FRAME_INDEPENDENT_SELECTION)) {
if (nsTextControlFrame* tcf = do_QueryFrame(frame)) {
return tcf->GetOwnedSelectionController(aSelCon);
}
frame = frame->GetParent();
}
*aSelCon = do_AddRef(aPresContext->PresShell()).take();
return NS_OK;
}
already_AddRefed<nsFrameSelection> nsIFrame::GetFrameSelection() {
RefPtr<nsFrameSelection> fs =
const_cast<nsFrameSelection*>(GetConstFrameSelection());
return fs.forget();
}
const nsFrameSelection* nsIFrame::GetConstFrameSelection() const {
nsIFrame* frame = const_cast<nsIFrame*>(this);
while (frame && frame->HasAnyStateBits(NS_FRAME_INDEPENDENT_SELECTION)) {
if (nsTextControlFrame* tcf = do_QueryFrame(frame)) {
return tcf->GetOwnedFrameSelection();
}
frame = frame->GetParent();
}
return PresShell()->ConstFrameSelection();
}
bool nsIFrame::IsFrameSelected() const {
NS_ASSERTION(!GetContent() || GetContent()->IsMaybeSelected(),
"use the public IsSelected() instead");
if (StaticPrefs::dom_shadowdom_selection_across_boundary_enabled()) {
if (const ShadowRoot* shadowRoot =
GetContent()->GetShadowRootForSelection()) {
return shadowRoot->IsSelected(0, shadowRoot->GetChildCount());
}
}
return GetContent()->IsSelected(0, GetContent()->GetChildCount());
}
nsresult nsIFrame::GetPointFromOffset(int32_t inOffset, nsPoint* outPoint) {
MOZ_ASSERT(outPoint != nullptr, "Null parameter");
nsRect contentRect = GetContentRectRelativeToSelf();
nsPoint pt = contentRect.TopLeft();
if (mContent) {
nsIContent* newContent = mContent->GetParent();
if (newContent) {
const int32_t newOffset = newContent->ComputeIndexOf_Deprecated(mContent);
// Find the direction of the frame from the EmbeddingLevelProperty,
// which is the resolved bidi level set in
// nsBidiPresUtils::ResolveParagraph (odd levels = right-to-left).
// If the embedding level isn't set, just use the CSS direction
// property.
bool hasBidiData;
FrameBidiData bidiData = GetProperty(BidiDataProperty(), &hasBidiData);
bool isRTL = hasBidiData
? bidiData.embeddingLevel.IsRTL()
: StyleVisibility()->mDirection == StyleDirection::Rtl;
if ((!isRTL && inOffset > newOffset) ||
(isRTL && inOffset <= newOffset)) {
pt = contentRect.TopRight();
}
}
}
*outPoint = pt;
return NS_OK;
}
nsresult nsIFrame::GetCharacterRectsInRange(int32_t aInOffset, int32_t aLength,
nsTArray<nsRect>& aOutRect) {
/* no text */
return NS_ERROR_FAILURE;
}
nsresult nsIFrame::GetChildFrameContainingOffset(int32_t inContentOffset,
bool inHint,
int32_t* outFrameContentOffset,
nsIFrame** outChildFrame) {
MOZ_ASSERT(outChildFrame && outFrameContentOffset, "Null parameter");
*outFrameContentOffset = (int32_t)inHint;
// the best frame to reflect any given offset would be a visible frame if
// possible i.e. we are looking for a valid frame to place the blinking caret
nsRect rect = GetRect();
if (!rect.width || !rect.height) {
// if we have a 0 width or height then lets look for another frame that
// possibly has the same content. If we have no frames in flow then just
// let us return 'this' frame
nsIFrame* nextFlow = GetNextInFlow();
if (nextFlow) {
return nextFlow->GetChildFrameContainingOffset(
inContentOffset, inHint, outFrameContentOffset, outChildFrame);
}
}
*outChildFrame = this;
return NS_OK;
}
//
// What I've pieced together about this routine:
// Starting with a block frame (from which a line frame can be gotten)
// and a line number, drill down and get the first/last selectable
// frame on that line, depending on aPos->mDirection.
// aOutSideLimit != 0 means ignore aLineStart, instead work from
// the end (if > 0) or beginning (if < 0).
//
static nsresult GetNextPrevLineFromBlockFrame(PeekOffsetStruct* aPos,
nsIFrame* aBlockFrame,
int32_t aLineStart,
int8_t aOutSideLimit) {
MOZ_ASSERT(aPos);
MOZ_ASSERT(aBlockFrame);
nsPresContext* pc = aBlockFrame->PresContext();
// magic numbers: aLineStart will be -1 for end of block, 0 will be start of
// block.
aPos->mResultFrame = nullptr;
aPos->mResultContent = nullptr;
aPos->mAttach = aPos->mDirection == eDirNext ? CaretAssociationHint::After
: CaretAssociationHint::Before;
AutoAssertNoDomMutations guard;
nsILineIterator* it = aBlockFrame->GetLineIterator();
if (!it) {
return NS_ERROR_FAILURE;
}
int32_t searchingLine = aLineStart;
int32_t countLines = it->GetNumLines();
if (aOutSideLimit > 0) { // start at end
searchingLine = countLines;
} else if (aOutSideLimit < 0) { // start at beginning
searchingLine = -1; //"next" will be 0
} else if ((aPos->mDirection == eDirPrevious && searchingLine == 0) ||
(aPos->mDirection == eDirNext &&
searchingLine >= (countLines - 1))) {
// Not found.
return NS_ERROR_FAILURE;
}
nsIFrame* resultFrame = nullptr;
nsIFrame* farStoppingFrame = nullptr; // we keep searching until we find a
// "this" frame then we go to next line
nsIFrame* nearStoppingFrame = nullptr; // if we are backing up from edge,
// stop here
bool isBeforeFirstFrame, isAfterLastFrame;
bool found = false;
const bool forceInEditableRegion =
aPos->mOptions.contains(PeekOffsetOption::ForceEditableRegion);
while (!found) {
if (aPos->mDirection == eDirPrevious) {
searchingLine--;
} else {
searchingLine++;
}
if ((aPos->mDirection == eDirPrevious && searchingLine < 0) ||
(aPos->mDirection == eDirNext && searchingLine >= countLines)) {
// we need to jump to new block frame.
return NS_ERROR_FAILURE;
}
{
auto line = it->GetLine(searchingLine).unwrap();
if (!line.mNumFramesOnLine) {
continue;
}
nsIFrame* firstFrame = nullptr;
nsIFrame* lastFrame = nullptr;
nsIFrame* frame = line.mFirstFrameOnLine;
int32_t i = line.mNumFramesOnLine;
do {
// If the caller wants a frame for a inclusive ancestor of the ancestor
// limiter, ignore frames for outside the limiter.
if (aPos->FrameContentIsInAncestorLimiter(frame)) {
if (!firstFrame) {
firstFrame = frame;
}
lastFrame = frame;
}
if (i == 1) {
break;
}
frame = frame->GetNextSibling();
if (!frame) {
NS_ERROR("GetLine promised more frames than could be found");
return NS_ERROR_FAILURE;
}
} while (--i);
if (!lastFrame) {
// If we're looking for an editable content frame, but all frames in the
// line are not in the specified editing host, return error because we
// must reach the editing host boundary.
return NS_ERROR_FAILURE;
}
nsIFrame::GetLastLeaf(&lastFrame);
if (aPos->mDirection == eDirNext) {
nearStoppingFrame = firstFrame;
farStoppingFrame = lastFrame;
} else {
nearStoppingFrame = lastFrame;
farStoppingFrame = firstFrame;
}
}
nsPoint offset;
nsView* view; // used for call of get offset from view
aBlockFrame->GetOffsetFromView(offset, &view);
nsPoint newDesiredPos =
aPos->mDesiredCaretPos -
offset; // get desired position into blockframe coords
// TODO: nsILineIterator::FindFrameAt should take optional editing host
// parameter and if it's set, it should return the nearest editable frame
// for the editing host when the frame at the desired position is not
// editable.
nsresult rv = it->FindFrameAt(searchingLine, newDesiredPos, &resultFrame,
&isBeforeFirstFrame, &isAfterLastFrame);
if (NS_FAILED(rv)) {
continue;
}
if (resultFrame) {
// If ancestor limiter is specified and we reached outside content of it,
// return error because we reached its element boundary.
if (!aPos->FrameContentIsInAncestorLimiter(resultFrame)) {
return NS_ERROR_FAILURE;
}
// check to see if this is ANOTHER blockframe inside the other one if so
// then call into its lines
if (resultFrame->CanProvideLineIterator()) {
aPos->mResultFrame = resultFrame;
return NS_OK;
}
// resultFrame is not a block frame
Maybe<nsFrameIterator> frameIterator;
frameIterator.emplace(
pc, resultFrame, nsFrameIterator::Type::PostOrder,
false, // aVisual
aPos->mOptions.contains(PeekOffsetOption::StopAtScroller),
false, // aFollowOOFs
false // aSkipPopupChecks
);
auto FoundValidFrame = [forceInEditableRegion, aPos](
const nsIFrame::ContentOffsets& aOffsets,
const nsIFrame* aFrame) {
if (!aOffsets.content) {
return false;
}
if (!aFrame->IsSelectable(nullptr)) {
return false;
}
if (aPos->mAncestorLimiter &&
!aOffsets.content->IsInclusiveDescendantOf(
aPos->mAncestorLimiter)) {
return false;
}
if (forceInEditableRegion && !aOffsets.content->IsEditable()) {
return false;
}
return true;
};
nsIFrame* storeOldResultFrame = resultFrame;
while (!found) {
nsPoint point;
nsRect tempRect = resultFrame->GetRect();
nsPoint offset;
nsView* view; // used for call of get offset from view
resultFrame->GetOffsetFromView(offset, &view);
if (!view) {
return NS_ERROR_FAILURE;
}
if (resultFrame->GetWritingMode().IsVertical()) {
point.y = aPos->mDesiredCaretPos.y;
point.x = tempRect.width + offset.x;
} else {
point.y = tempRect.height + offset.y;
point.x = aPos->mDesiredCaretPos.x;
}
if (!resultFrame->HasView()) {
nsView* view;
nsPoint offset;
resultFrame->GetOffsetFromView(offset, &view);
nsIFrame::ContentOffsets offsets =
resultFrame->GetContentOffsetsFromPoint(
point - offset, nsIFrame::IGNORE_NATIVE_ANONYMOUS_SUBTREE);
aPos->mResultContent = offsets.content;
aPos->mContentOffset = offsets.offset;
aPos->mAttach = offsets.associate;
if (FoundValidFrame(offsets, resultFrame)) {
found = true;
break;
}
}
if (aPos->mDirection == eDirPrevious &&
resultFrame == farStoppingFrame) {
break;
}
if (aPos->mDirection == eDirNext && resultFrame == nearStoppingFrame) {
break;
}
// always try previous on THAT line if that fails go the other way
resultFrame = frameIterator->Traverse(/* aForward = */ false);
if (!resultFrame) {
return NS_ERROR_FAILURE;
}
}
if (!found) {
resultFrame = storeOldResultFrame;
frameIterator.reset();
frameIterator.emplace(
pc, resultFrame, nsFrameIterator::Type::Leaf,
false, // aVisual
aPos->mOptions.contains(PeekOffsetOption::StopAtScroller),
false, // aFollowOOFs
false // aSkipPopupChecks
);
MOZ_ASSERT(frameIterator);
}
while (!found) {
nsPoint point = aPos->mDesiredCaretPos;
nsView* view;
nsPoint offset;
resultFrame->GetOffsetFromView(offset, &view);
nsIFrame::ContentOffsets offsets =
resultFrame->GetContentOffsetsFromPoint(
point - offset, nsIFrame::IGNORE_NATIVE_ANONYMOUS_SUBTREE);
aPos->mResultContent = offsets.content;
aPos->mContentOffset = offsets.offset;
aPos->mAttach = offsets.associate;
if (FoundValidFrame(offsets, resultFrame)) {
found = true;
aPos->mAttach = resultFrame == farStoppingFrame
? CaretAssociationHint::Before
: CaretAssociationHint::After;
break;
}
if (aPos->mDirection == eDirPrevious &&
resultFrame == nearStoppingFrame) {
break;
}
if (aPos->mDirection == eDirNext && resultFrame == farStoppingFrame) {
break;
}
// previous didnt work now we try "next"
nsIFrame* tempFrame = frameIterator->Traverse(/* aForward = */ true);
if (!tempFrame) {
break;
}
resultFrame = tempFrame;
}
aPos->mResultFrame = resultFrame;
} else {
// we need to jump to new block frame.
aPos->mAmount = eSelectLine;
aPos->mStartOffset = 0;
aPos->mAttach = aPos->mDirection == eDirNext
? CaretAssociationHint::Before
: CaretAssociationHint::After;
if (aPos->mDirection == eDirPrevious) {
aPos->mStartOffset = -1; // start from end
}
return aBlockFrame->PeekOffset(aPos);
}
}
return NS_OK;
}
nsIFrame::CaretPosition nsIFrame::GetExtremeCaretPosition(bool aStart) {
CaretPosition result;
FrameTarget targetFrame = DrillDownToSelectionFrame(this, !aStart, 0);
FrameContentRange range = GetRangeForFrame(targetFrame.frame);
result.mResultContent = range.content;
result.mContentOffset = aStart ? range.start : range.end;
return result;
}
// If this is a preformatted text frame, see if it ends with a newline
static nsContentAndOffset FindLineBreakInText(nsIFrame* aFrame,
nsDirection aDirection) {
nsContentAndOffset result;
if (aFrame->IsGeneratedContentFrame() ||
!aFrame->HasSignificantTerminalNewline()) {
return result;
}
int32_t endOffset = aFrame->GetOffsets().second;
result.mContent = aFrame->GetContent();
result.mOffset = endOffset - (aDirection == eDirPrevious ? 0 : 1);
return result;
}
// Find the first (or last) descendant of the given frame
// which is either a block-level frame or a BRFrame, or some other kind of break
// which stops the line.
static nsContentAndOffset FindLineBreakingFrame(nsIFrame* aFrame,
nsDirection aDirection) {
nsContentAndOffset result;
if (aFrame->IsGeneratedContentFrame()) {
return result;
}
// Treat form controls and other replaced inline level elements as inline
// leaves.
if (aFrame->IsReplaced() && aFrame->IsInlineOutside() &&
!aFrame->IsBrFrame() && !aFrame->IsTextFrame()) {
return result;
}
// Check the frame itself
// Fall through block-in-inline split frames because their mContent is
// the content of the inline frames they were created from. The
// first/last child of such frames is the real block frame we're
// looking for.
if ((aFrame->IsBlockOutside() &&
!aFrame->HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT)) ||
aFrame->IsBrFrame()) {
nsIContent* content = aFrame->GetContent();
result.mContent = content->GetParent();
// content. This probably shouldn't ever happen, but since it sometimes
// does, we want to avoid crashing here.
NS_ASSERTION(result.mContent, "Unexpected orphan content");
if (result.mContent) {
result.mOffset = result.mContent->ComputeIndexOf_Deprecated(content) +
(aDirection == eDirPrevious ? 1 : 0);
}
return result;
}
result = FindLineBreakInText(aFrame, aDirection);
if (result.mContent) {
return result;
}
// Iterate over children and call ourselves recursively
if (aDirection == eDirPrevious) {
nsIFrame* child = aFrame->PrincipalChildList().LastChild();
while (child && !result.mContent) {
result = FindLineBreakingFrame(child, aDirection);
child = child->GetPrevSibling();
}
} else { // eDirNext
nsIFrame* child = aFrame->PrincipalChildList().FirstChild();
while (child && !result.mContent) {
result = FindLineBreakingFrame(child, aDirection);
child = child->GetNextSibling();
}
}
return result;
}
nsresult nsIFrame::PeekOffsetForParagraph(PeekOffsetStruct* aPos) {
nsIFrame* frame = this;
nsContentAndOffset blockFrameOrBR;
blockFrameOrBR.mContent = nullptr;
bool reachedLimit = frame->IsBlockOutside() || IsEditingHost(frame);
auto traverse = [&aPos](nsIFrame* current) {
return aPos->mDirection == eDirPrevious ? current->GetPrevSibling()
: current->GetNextSibling();
};
// Go through containing frames until reaching a block frame.
// In each step, search the previous (or next) siblings for the closest
// "stop frame" (a block frame or a BRFrame).
// If found, set it to be the selection boundary and abort.
while (!reachedLimit) {
nsIFrame* parent = frame->GetParent();
// Treat a frame associated with the root content as if it were a block
// frame.
if (!frame->mContent || !frame->mContent->GetParent()) {
reachedLimit = true;
break;
}
if (aPos->mDirection == eDirNext) {
// Try to find our own line-break before looking at our siblings.
blockFrameOrBR = FindLineBreakInText(frame, eDirNext);
}
nsIFrame* sibling = traverse(frame);
while (sibling && !blockFrameOrBR.mContent) {
blockFrameOrBR = FindLineBreakingFrame(sibling, aPos->mDirection);
sibling = traverse(sibling);
}
if (blockFrameOrBR.mContent) {
aPos->mResultContent = blockFrameOrBR.mContent;
aPos->mContentOffset = blockFrameOrBR.mOffset;
break;
}
frame = parent;
reachedLimit = frame && (frame->IsBlockOutside() || IsEditingHost(frame));
}
if (reachedLimit) { // no "stop frame" found
aPos->mResultContent = frame->GetContent();
if (ShadowRoot* shadowRoot =
aPos->mResultContent->GetShadowRootForSelection()) {
// Even if there's no children for this node,
// the elements inside the shadow root is still
// selectable
aPos->mResultContent = shadowRoot;
}
if (aPos->mDirection == eDirPrevious) {
aPos->mContentOffset = 0;
} else if (aPos->mResultContent) {
aPos->mContentOffset = aPos->mResultContent->GetChildCount();
}
}
return NS_OK;
}
// Determine movement direction relative to frame
static bool IsMovingInFrameDirection(const nsIFrame* frame,
nsDirection aDirection, bool aVisual) {
bool isReverseDirection =
aVisual && nsBidiPresUtils::IsReversedDirectionFrame(frame);
return aDirection == (isReverseDirection ? eDirPrevious : eDirNext);
}
// Determines "are we looking for a boundary between whitespace and
// non-whitespace (in the direction we're moving in)". It is true when moving
// forward and looking for a beginning of a word, or when moving backwards and
// looking for an end of a word.
static bool ShouldWordSelectionEatSpace(const PeekOffsetStruct& aPos) {
if (aPos.mWordMovementType != eDefaultBehavior) {
// aPos->mWordMovementType possible values:
// eEndWord: eat the space if we're moving backwards
// eStartWord: eat the space if we're moving forwards
return (aPos.mWordMovementType == eEndWord) ==
(aPos.mDirection == eDirPrevious);
}
// Use the hidden preference which is based on operating system
// behavior. This pref only affects whether moving forward by word
// should go to the end of this word or start of the next word. When
// going backwards, the start of the word is always used, on every
// operating system.
return aPos.mDirection == eDirNext &&
StaticPrefs::layout_word_select_eat_space_to_next_word();
}
enum class OffsetIsAtLineEdge : bool { No, Yes };
static void SetPeekResultFromFrame(PeekOffsetStruct& aPos, nsIFrame* aFrame,
int32_t aOffset,
OffsetIsAtLineEdge aAtLineEdge) {
FrameContentRange range = GetRangeForFrame(aFrame);
aPos.mResultFrame = aFrame;
aPos.mResultContent = range.content;
// Output offset is relative to content, not frame
aPos.mContentOffset =
aOffset < 0 ? range.end + aOffset + 1 : range.start + aOffset;
if (aAtLineEdge == OffsetIsAtLineEdge::Yes) {
aPos.mAttach = aPos.mContentOffset == range.start
? CaretAssociationHint::After
: CaretAssociationHint::Before;
}
}
void nsIFrame::SelectablePeekReport::TransferTo(PeekOffsetStruct& aPos) const {
return SetPeekResultFromFrame(aPos, mFrame, mOffset, OffsetIsAtLineEdge::No);
}
nsIFrame::SelectablePeekReport::SelectablePeekReport(
const mozilla::GenericErrorResult<nsresult>&& aErr) {
MOZ_ASSERT(NS_FAILED(aErr.operator nsresult()));
// Return an empty report
}
nsresult nsIFrame::PeekOffsetForCharacter(PeekOffsetStruct* aPos,
int32_t aOffset) {
SelectablePeekReport current{this, aOffset};
nsIFrame::FrameSearchResult peekSearchState = CONTINUE;
const bool forceEditableRegion =
aPos->mOptions.contains(PeekOffsetOption::ForceEditableRegion);
while (peekSearchState != FOUND) {
const bool movingInFrameDirection = IsMovingInFrameDirection(
current.mFrame, aPos->mDirection,
aPos->mOptions.contains(PeekOffsetOption::Visual));
if (current.mJumpedLine) {
// If we jumped lines, it's as if we found a character, but we still need
// to eat non-renderable content on the new line.
peekSearchState = current.PeekOffsetNoAmount(movingInFrameDirection);
} else {
PeekOffsetCharacterOptions options;
options.mRespectClusters = aPos->mAmount == eSelectCluster;
peekSearchState =
current.PeekOffsetCharacter(movingInFrameDirection, options);
if (peekSearchState == FOUND && forceEditableRegion &&
!current.mFrame->ContentIsEditable()) {
// Treat non-editable content as unselectable. Note that we may need to
// set mJumpedLine propery even if it's not editable. Therefore, we
// cannot skip the above call.
peekSearchState = CONTINUE_UNSELECTABLE;
}
}
current.mMovedOverNonSelectableText |=
peekSearchState == CONTINUE_UNSELECTABLE;
if (peekSearchState != FOUND) {
SelectablePeekReport next = current.mFrame->GetFrameFromDirection(*aPos);
if (next.Failed()) {
return NS_ERROR_FAILURE;
}
next.mJumpedLine |= current.mJumpedLine;
next.mMovedOverNonSelectableText |= current.mMovedOverNonSelectableText;
next.mHasSelectableFrame |= current.mHasSelectableFrame;
current = next;
}
// Found frame, but because we moved over non selectable text we want
// the offset to be at the frame edge. Note that if we are extending the
// selection, this doesn't matter.
if (peekSearchState == FOUND && current.mMovedOverNonSelectableText &&
(!aPos->mOptions.contains(PeekOffsetOption::Extend) ||
current.mHasSelectableFrame)) {
auto [start, end] = current.mFrame->GetOffsets();
current.mOffset = aPos->mDirection == eDirNext ? 0 : end - start;
}
}
// Set outputs
current.TransferTo(*aPos);
// If we're dealing with a text frame and moving backward positions us at
// the end of that line, decrease the offset by one to make sure that
// we're placed before the linefeed character on the previous line.
if (current.mOffset < 0 && current.mJumpedLine &&
aPos->mDirection == eDirPrevious &&
current.mFrame->HasSignificantTerminalNewline() &&
!current.mIgnoredBrFrame) {
--aPos->mContentOffset;
}
return NS_OK;
}
nsresult nsIFrame::PeekOffsetForWord(PeekOffsetStruct* aPos, int32_t aOffset) {
SelectablePeekReport current{this, aOffset};
bool shouldStopAtHardBreak =
aPos->mWordMovementType == eDefaultBehavior &&
StaticPrefs::layout_word_select_eat_space_to_next_word();
bool wordSelectEatSpace = ShouldWordSelectionEatSpace(*aPos);
PeekWordState state;
while (true) {
bool movingInFrameDirection = IsMovingInFrameDirection(
current.mFrame, aPos->mDirection,
aPos->mOptions.contains(PeekOffsetOption::Visual));
FrameSearchResult searchResult = current.mFrame->PeekOffsetWord(
movingInFrameDirection, wordSelectEatSpace,
aPos->mOptions.contains(PeekOffsetOption::IsKeyboardSelect),
¤t.mOffset, &state,
!aPos->mOptions.contains(PeekOffsetOption::PreserveSpaces));
if (searchResult == FOUND) {
break;
}
SelectablePeekReport next = [&]() {
PeekOffsetOptions options = aPos->mOptions;
if (state.mSawInlineCharacter) {
// If we've already found a character, we don't want to stop at
// placeholder frame boundary if there is in the word.
options += PeekOffsetOption::StopAtPlaceholder;
}
return current.mFrame->GetFrameFromDirection(aPos->mDirection, options);
}();
if (next.Failed()) {
// If we've crossed the line boundary, check to make sure that we
// have not consumed a trailing newline as whitespace if it's
// significant.
if (next.mJumpedLine && wordSelectEatSpace &&
current.mFrame->HasSignificantTerminalNewline() &&
current.mFrame->StyleText()->mWhiteSpaceCollapse !=
StyleWhiteSpaceCollapse::PreserveBreaks) {
current.mOffset -= 1;
}
break;
}
if ((next.mJumpedLine || next.mFoundPlaceholder) && !wordSelectEatSpace &&
state.mSawBeforeType) {
// We can't jump lines if we're looking for whitespace following
// non-whitespace, and we already encountered non-whitespace.
break;
}
if (shouldStopAtHardBreak && next.mJumpedHardBreak) {
/**
* Prev, always: Jump and stop right there
* Next, saw inline: just stop
* Next, no inline: Jump and consume whitespaces
*/
if (aPos->mDirection == eDirPrevious) {
// Try moving to the previous line if exists
current.TransferTo(*aPos);
current.mFrame->PeekOffsetForCharacter(aPos, current.mOffset);
return NS_OK;
}
if (state.mSawInlineCharacter || current.mJumpedHardBreak) {
if (current.mFrame->HasSignificantTerminalNewline()) {
current.mOffset -= 1;
}
current.TransferTo(*aPos);
return NS_OK;
}
// Mark the state as whitespace and continue
state.Update(false, true);
}
if (next.mJumpedLine) {
state.mContext.Truncate();
}
current = next;
// Jumping a line is equivalent to encountering whitespace
// This affects only when it already met an actual character
if (wordSelectEatSpace && next.mJumpedLine) {
state.SetSawBeforeType();
}
}
// Set outputs
current.TransferTo(*aPos);
return NS_OK;
}
static nsIFrame* GetFirstSelectableDescendantWithLineIterator(
const PeekOffsetStruct& aPeekOffsetStruct, nsIFrame* aParentFrame) {
const bool forceEditableRegion = aPeekOffsetStruct.mOptions.contains(
PeekOffsetOption::ForceEditableRegion);
auto FoundValidFrame = [aPeekOffsetStruct,
forceEditableRegion](const nsIFrame* aFrame) {
if (!aFrame->IsSelectable(nullptr)) {
return false;
}
if (!aPeekOffsetStruct.FrameContentIsInAncestorLimiter(aFrame)) {
return false;
}
if (forceEditableRegion && !aFrame->ContentIsEditable()) {
return false;
}
return true;
};
for (nsIFrame* child : aParentFrame->PrincipalChildList()) {
// some children may not be selectable, e.g. :before / :after pseudoelements
// content with user-select: none, or contenteditable="false"
// we need to skip them
if (child->CanProvideLineIterator() && FoundValidFrame(child)) {
return child;
}
if (nsIFrame* nested = GetFirstSelectableDescendantWithLineIterator(
aPeekOffsetStruct, child)) {
return nested;
}
}
return nullptr;
}
nsresult nsIFrame::PeekOffsetForLine(PeekOffsetStruct* aPos) {
nsIFrame* blockFrame = this;
nsresult result = NS_ERROR_FAILURE;
// outer loop
// moving to a next block when no more blocks are available in a subtree
AutoAssertNoDomMutations guard;
while (NS_FAILED(result)) {
auto [newBlock, lineFrame] = blockFrame->GetContainingBlockForLine(
aPos->mOptions.contains(PeekOffsetOption::StopAtScroller));
if (!newBlock) {
return NS_ERROR_FAILURE;
}
// FYI: If the editing host is an inline element, the block frame content
// may be either not editable or editable but belonging to different editing
// host.
blockFrame = newBlock;
nsILineIterator* iter = blockFrame->GetLineIterator();
int32_t thisLine = iter->FindLineContaining(lineFrame);
if (NS_WARN_IF(thisLine < 0)) {
return NS_ERROR_FAILURE;
}
int8_t edgeCase = 0; // no edge case. This should look at thisLine
// this part will find a frame or a block frame. If it's a block frame
// it will "drill down" to find a viable frame or it will return an
// error.
nsIFrame* lastFrame = this;
// inner loop - crawling the frames within a specific block subtree
while (true) {
result =
GetNextPrevLineFromBlockFrame(aPos, blockFrame, thisLine, edgeCase);
// we came back to same spot! keep going
if (NS_SUCCEEDED(result) &&
(!aPos->mResultFrame || aPos->mResultFrame == lastFrame)) {
aPos->mResultFrame = nullptr;
lastFrame = nullptr;
if (aPos->mDirection == eDirPrevious) {
thisLine--;
} else {
thisLine++;
}
continue;
}
if (NS_FAILED(result)) {
break;
}
lastFrame = aPos->mResultFrame; // set last frame
/* SPECIAL CHECK FOR NAVIGATION INTO TABLES
* when we hit a frame which doesn't have line iterator, we need to
* drill down and find a child with the line iterator to prevent the
* crawling process to prematurely finish. Note that this is only sound if
* we're guaranteed to not have multiple children implementing
* LineIterator.
*
* So far known cases are:
* 1) table wrapper (drill down into table row group)
* 2) table cell (drill down into its only anon child)
*/
const bool shouldDrillIntoChildren =
aPos->mResultFrame->IsTableWrapperFrame() ||
aPos->mResultFrame->IsTableCellFrame();
if (shouldDrillIntoChildren) {
nsIFrame* child = GetFirstSelectableDescendantWithLineIterator(
*aPos, aPos->mResultFrame);
if (child) {
aPos->mResultFrame = child;
}
}
if (!aPos->mResultFrame->CanProvideLineIterator()) {
// no more selectable content at this level
break;
}
if (aPos->mResultFrame == blockFrame) {
// Make sure block element is not the same as the one we had before.
break;
}
// we've struck another block element with selectable content!
if (aPos->mDirection == eDirPrevious) {
edgeCase = 1; // far edge, search from end backwards
} else {
edgeCase = -1; // near edge search from beginning onwards
}
thisLine = 0; // this line means nothing now.
// everything else means something so keep looking "inside" the
// block
blockFrame = aPos->mResultFrame;
}
}
return result;
}
nsresult nsIFrame::PeekOffsetForLineEdge(PeekOffsetStruct* aPos) {
// Adjusted so that the caret can't get confused when content changes
nsIFrame* frame = AdjustFrameForSelectionStyles(this);
Element* editingHost = frame->GetContent()->GetEditingHost();
auto [blockFrame, lineFrame] = frame->GetContainingBlockForLine(
aPos->mOptions.contains(PeekOffsetOption::StopAtScroller));
if (!blockFrame) {
return NS_ERROR_FAILURE;
}
AutoAssertNoDomMutations guard;
nsILineIterator* it = blockFrame->GetLineIterator();
int32_t thisLine = it->FindLineContaining(lineFrame);
if (thisLine < 0) {
return NS_ERROR_FAILURE;
}
nsIFrame* baseFrame = nullptr;
bool endOfLine = eSelectEndLine == aPos->mAmount;
if (aPos->mOptions.contains(PeekOffsetOption::Visual) &&
PresContext()->BidiEnabled()) {
nsIFrame* firstFrame;
bool isReordered;
nsIFrame* lastFrame;
MOZ_TRY(
it->CheckLineOrder(thisLine, &isReordered, &firstFrame, &lastFrame));
baseFrame = endOfLine ? lastFrame : firstFrame;
} else {
auto line = it->GetLine(thisLine).unwrap();
nsIFrame* frame = line.mFirstFrameOnLine;
bool lastFrameWasEditable = false;
for (int32_t count = line.mNumFramesOnLine; count;
--count, frame = frame->GetNextSibling()) {
if (frame->IsGeneratedContentFrame()) {
continue;
}
// When jumping to the end of the line with the "end" key,
// try to skip over brFrames
if (endOfLine && line.mNumFramesOnLine > 1 && frame->IsBrFrame() &&
lastFrameWasEditable == frame->GetContent()->IsEditable()) {
continue;
}
lastFrameWasEditable =
frame->GetContent() && frame->GetContent()->IsEditable();
baseFrame = frame;
if (!endOfLine) {
break;
}
}
}
if (!baseFrame) {
return NS_ERROR_FAILURE;
}
// Make sure we are not leaving our inline editing host if exists
if (editingHost) {
if (nsIFrame* frame = editingHost->GetPrimaryFrame()) {
if (frame->IsInlineOutside() &&
!editingHost->Contains(baseFrame->GetContent())) {
baseFrame = frame;
if (endOfLine) {
baseFrame = baseFrame->LastContinuation();
}
}
}
}
FrameTarget targetFrame = DrillDownToSelectionFrame(
baseFrame, endOfLine, nsIFrame::IGNORE_NATIVE_ANONYMOUS_SUBTREE);
SetPeekResultFromFrame(*aPos, targetFrame.frame, endOfLine ? -1 : 0,
OffsetIsAtLineEdge::Yes);
if (endOfLine && targetFrame.frame->HasSignificantTerminalNewline()) {
// Do not position the caret after the terminating newline if we're
--aPos->mContentOffset;
}
if (!aPos->mResultContent) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult nsIFrame::PeekOffset(PeekOffsetStruct* aPos) {
MOZ_ASSERT(aPos);
if (NS_WARN_IF(HasAnyStateBits(NS_FRAME_IS_DIRTY))) {
return NS_ERROR_UNEXPECTED;
}
// Translate content offset to be relative to frame
int32_t offset = aPos->mStartOffset - GetRangeForFrame(this).start;
switch (aPos->mAmount) {
case eSelectCharacter:
case eSelectCluster:
return PeekOffsetForCharacter(aPos, offset);
case eSelectWordNoSpace:
// eSelectWordNoSpace means that we should not be eating any whitespace
// when moving to the adjacent word. This means that we should set aPos->
// mWordMovementType to eEndWord if we're moving forwards, and to
// eStartWord if we're moving backwards.
if (aPos->mDirection == eDirPrevious) {
aPos->mWordMovementType = eStartWord;
} else {
aPos->mWordMovementType = eEndWord;
}
// Intentionally fall through the eSelectWord case.
[[fallthrough]];
case eSelectWord:
return PeekOffsetForWord(aPos, offset);
case eSelectLine:
return PeekOffsetForLine(aPos);
case eSelectBeginLine:
case eSelectEndLine:
return PeekOffsetForLineEdge(aPos);
case eSelectParagraph:
return PeekOffsetForParagraph(aPos);
default: {
NS_ASSERTION(false, "Invalid amount");
return NS_ERROR_FAILURE;
}
}
}
nsIFrame::FrameSearchResult nsIFrame::PeekOffsetNoAmount(bool aForward,
int32_t* aOffset) {
NS_ASSERTION(aOffset && *aOffset <= 1, "aOffset out of range");
// Sure, we can stop right here.
return FOUND;
}
nsIFrame::FrameSearchResult nsIFrame::PeekOffsetCharacter(
bool aForward, int32_t* aOffset, PeekOffsetCharacterOptions aOptions) {
NS_ASSERTION(aOffset && *aOffset <= 1, "aOffset out of range");
int32_t startOffset = *aOffset;
// A negative offset means "end of frame", which in our case means offset 1.
if (startOffset < 0) {
startOffset = 1;
}
if (aForward == (startOffset == 0)) {
// We're before the frame and moving forward, or after it and moving
// backwards: skip to the other side and we're done.
*aOffset = 1 - startOffset;
return FOUND;
}
return CONTINUE;
}
nsIFrame::FrameSearchResult nsIFrame::PeekOffsetWord(
bool aForward, bool aWordSelectEatSpace, bool aIsKeyboardSelect,
int32_t* aOffset, PeekWordState* aState, bool /*aTrimSpaces*/) {
NS_ASSERTION(aOffset && *aOffset <= 1, "aOffset out of range");
int32_t startOffset = *aOffset;
// This isn't text, so truncate the context
aState->mContext.Truncate();
if (startOffset < 0) {
startOffset = 1;
}
if (aForward == (startOffset == 0)) {
// We're before the frame and moving forward, or after it and moving
// backwards. If we're looking for non-whitespace, we found it (without
// skipping this frame).
if (!aState->mAtStart) {
if (aState->mLastCharWasPunctuation) {
// We're not punctuation, so this is a punctuation boundary.
if (BreakWordBetweenPunctuation(aState, aForward, false, false,
aIsKeyboardSelect)) {
return FOUND;
}
} else {
// This is not a punctuation boundary.
if (aWordSelectEatSpace && aState->mSawBeforeType) {
return FOUND;
}
}
}
// Otherwise skip to the other side and note that we encountered
// non-whitespace.
*aOffset = 1 - startOffset;
aState->Update(false, // not punctuation
false // not whitespace
);
if (!aWordSelectEatSpace) {
aState->SetSawBeforeType();
}
}
return CONTINUE;
}
// static
bool nsIFrame::BreakWordBetweenPunctuation(const PeekWordState* aState,
bool aForward, bool aPunctAfter,
bool aWhitespaceAfter,
bool aIsKeyboardSelect) {
NS_ASSERTION(aPunctAfter != aState->mLastCharWasPunctuation,
"Call this only at punctuation boundaries");
if (aState->mLastCharWasWhitespace) {
// We always stop between whitespace and punctuation
return true;
}
if (!StaticPrefs::layout_word_select_stop_at_punctuation()) {
// When this pref is false, we never stop at a punctuation boundary unless
// it's followed by whitespace (in the relevant direction).
return aWhitespaceAfter;
}
if (!aIsKeyboardSelect) {
// mouse caret movement (e.g. word selection) always stops at every
// punctuation boundary
return true;
}
bool afterPunct = aForward ? aState->mLastCharWasPunctuation : aPunctAfter;
if (!afterPunct) {
// keyboard caret movement only stops after punctuation (in content order)
return false;
}
// Stop only if we've seen some non-punctuation since the last whitespace;
// don't stop after punctuation that follows whitespace.
return aState->mSeenNonPunctuationSinceWhitespace;
}
std::pair<nsIFrame*, nsIFrame*> nsIFrame::GetContainingBlockForLine(
bool aLockScroll) const {
const nsIFrame* parentFrame = this;
const nsIFrame* frame;
while (parentFrame) {
frame = parentFrame;
if (frame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
// if we are searching for a frame that is not in flow we will not find
// it. we must instead look for its placeholder
if (frame->HasAnyStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER)) {
// abspos continuations don't have placeholders, get the fif
frame = frame->FirstInFlow();
}
frame = frame->GetPlaceholderFrame();
if (!frame) {
return std::pair(nullptr, nullptr);
}
}
parentFrame = frame->GetParent();
if (parentFrame) {
if (aLockScroll && parentFrame->IsScrollContainerFrame()) {
return std::pair(nullptr, nullptr);
}
if (parentFrame->CanProvideLineIterator()) {
return std::pair(const_cast<nsIFrame*>(parentFrame),
const_cast<nsIFrame*>(frame));
}
}
}
return std::pair(nullptr, nullptr);
}
Result<bool, nsresult> nsIFrame::IsVisuallyAtLineEdge(
nsILineIterator* aLineIterator, int32_t aLine, nsDirection aDirection) {
auto line = aLineIterator->GetLine(aLine).unwrap();
const bool lineIsRTL = aLineIterator->IsLineIteratorFlowRTL();
nsIFrame *firstFrame = nullptr, *lastFrame = nullptr;
bool isReordered = false;
MOZ_TRY(aLineIterator->CheckLineOrder(aLine, &isReordered, &firstFrame,
&lastFrame));
if (!firstFrame || !lastFrame) {
return true; // XXX: Why true? We check whether `this` is at the edge...
}
nsIFrame* leftmostFrame = lineIsRTL ? lastFrame : firstFrame;
nsIFrame* rightmostFrame = lineIsRTL ? firstFrame : lastFrame;
auto FrameIsRTL = [](nsIFrame* aFrame) {
return nsBidiPresUtils::FrameDirection(aFrame) ==
mozilla::intl::BidiDirection::RTL;
};
if (!lineIsRTL == (aDirection == eDirPrevious)) {
nsIFrame* maybeLeftmostFrame = leftmostFrame;
for ([[maybe_unused]] int32_t i : IntegerRange(line.mNumFramesOnLine)) {
if (maybeLeftmostFrame == this) {
return true;
}
// If left edge of the line starts with placeholder frames, we can ignore
// them and should keep checking the following frames.
if (!maybeLeftmostFrame->IsPlaceholderFrame()) {
if ((FrameIsRTL(maybeLeftmostFrame) == lineIsRTL) ==
(aDirection == eDirPrevious)) {
nsIFrame::GetFirstLeaf(&maybeLeftmostFrame);
} else {
nsIFrame::GetLastLeaf(&maybeLeftmostFrame);
}
return maybeLeftmostFrame == this;
}
maybeLeftmostFrame = nsBidiPresUtils::GetFrameToRightOf(
maybeLeftmostFrame, line.mFirstFrameOnLine, line.mNumFramesOnLine);
if (!maybeLeftmostFrame) {
return false;
}
}
return false;
}
nsIFrame* maybeRightmostFrame = rightmostFrame;
for ([[maybe_unused]] int32_t i : IntegerRange(line.mNumFramesOnLine)) {
if (maybeRightmostFrame == this) {
return true;
}
// If the line ends with placehlder frames, we can ignore them and should
// keep checking the preceding frames.
if (!maybeRightmostFrame->IsPlaceholderFrame()) {
if ((FrameIsRTL(maybeRightmostFrame) == lineIsRTL) ==
(aDirection == eDirPrevious)) {
nsIFrame::GetFirstLeaf(&maybeRightmostFrame);
} else {
nsIFrame::GetLastLeaf(&maybeRightmostFrame);
}
return maybeRightmostFrame == this;
}
maybeRightmostFrame = nsBidiPresUtils::GetFrameToLeftOf(
maybeRightmostFrame, line.mFirstFrameOnLine, line.mNumFramesOnLine);
if (!maybeRightmostFrame) {
return false;
}
}
return false;
}
Result<bool, nsresult> nsIFrame::IsLogicallyAtLineEdge(
nsILineIterator* aLineIterator, int32_t aLine, nsDirection aDirection) {
auto line = aLineIterator->GetLine(aLine).unwrap();
if (!line.mNumFramesOnLine) {
return false;
}
MOZ_ASSERT(line.mFirstFrameOnLine);
if (aDirection == eDirPrevious) {
nsIFrame* maybeFirstFrame = line.mFirstFrameOnLine;
for ([[maybe_unused]] int32_t i : IntegerRange(line.mNumFramesOnLine)) {
if (maybeFirstFrame == this) {
return true;
}
// If the line starts with placeholder frames, we can ignore them and
// should keep checking the following frames.
if (!maybeFirstFrame->IsPlaceholderFrame()) {
nsIFrame::GetFirstLeaf(&maybeFirstFrame);
return maybeFirstFrame == this;
}
maybeFirstFrame = maybeFirstFrame->GetNextSibling();
if (!maybeFirstFrame) {
return false;
}
}
return false;
}
// eDirNext
nsIFrame* maybeLastFrame = line.GetLastFrameOnLine();
for ([[maybe_unused]] int32_t i : IntegerRange(line.mNumFramesOnLine)) {
if (maybeLastFrame == this) {
return true;
}
// If the line ends with placehlder frames, we can ignore them and should
// keep checking the preceding frames.
if (!maybeLastFrame->IsPlaceholderFrame()) {
nsIFrame::GetLastLeaf(&maybeLastFrame);
return maybeLastFrame == this;
}
maybeLastFrame = maybeLastFrame->GetPrevSibling();
}
return false;
}
nsIFrame::SelectablePeekReport nsIFrame::GetFrameFromDirection(
nsDirection aDirection, const PeekOffsetOptions& aOptions) {
SelectablePeekReport result;
nsPresContext* presContext = PresContext();
const bool needsVisualTraversal =
aOptions.contains(PeekOffsetOption::Visual) && presContext->BidiEnabled();
const bool followOofs =
!aOptions.contains(PeekOffsetOption::StopAtPlaceholder);
nsFrameIterator frameIterator(
presContext, this, nsFrameIterator::Type::Leaf, needsVisualTraversal,
aOptions.contains(PeekOffsetOption::StopAtScroller), followOofs,
false // aSkipPopupChecks
);
// Find the prev/next selectable frame
bool selectable = false;
nsIFrame* traversedFrame = this;
AutoAssertNoDomMutations guard;
const nsIContent* const nativeAnonymousSubtreeContent =
GetClosestNativeAnonymousSubtreeRoot();
while (!selectable) {
auto [blockFrame, lineFrame] = traversedFrame->GetContainingBlockForLine(
aOptions.contains(PeekOffsetOption::StopAtScroller));
if (!blockFrame) {
return result;
}
nsILineIterator* it = blockFrame->GetLineIterator();
int32_t thisLine = it->FindLineContaining(lineFrame);
if (thisLine < 0) {
return result;
}
bool atLineEdge;
MOZ_TRY_VAR(
atLineEdge,
needsVisualTraversal
? traversedFrame->IsVisuallyAtLineEdge(it, thisLine, aDirection)
: traversedFrame->IsLogicallyAtLineEdge(it, thisLine, aDirection));
if (atLineEdge) {
result.mJumpedLine = true;
if (!aOptions.contains(PeekOffsetOption::JumpLines)) {
return result; // we are done. cannot jump lines
}
int32_t lineToCheckWrap =
aDirection == eDirPrevious ? thisLine - 1 : thisLine;
if (lineToCheckWrap < 0 ||
!it->GetLine(lineToCheckWrap).unwrap().mIsWrapped) {
result.mJumpedHardBreak = true;
}
}
traversedFrame = frameIterator.Traverse(aDirection == eDirNext);
if (!traversedFrame) {
return result;
}
if (aOptions.contains(PeekOffsetOption::StopAtPlaceholder) &&
traversedFrame->IsPlaceholderFrame()) {
// XXX If the placeholder frame does not have meaningful content, the user
// may want to select as a word around the out-of-flow cotent. However,
// non-text frame resets context in nsIFrame::PeekOffsetWord(). Therefore,
// next text frame considers the new word starts from its edge. So, it's
// not enough to implement such behavior with adding a check here whether
// the real frame may change the word with its contents if it were not
// out-of-flow.
result.mFoundPlaceholder = true;
return result;
}
auto IsSelectable =
[aOptions, nativeAnonymousSubtreeContent](const nsIFrame* aFrame) {
if (!aFrame->IsSelectable(nullptr)) {
return false;
}
// If the new frame is in a native anonymous subtree, we should treat
// it as not selectable unless the frame and found frame are in same
// subtree.
if (aFrame->GetClosestNativeAnonymousSubtreeRoot() !=
nativeAnonymousSubtreeContent) {
return false;
}
return !aOptions.contains(PeekOffsetOption::ForceEditableRegion) ||
aFrame->GetContent()->IsEditable();
};
// Skip br frames, but only if we can select something before hitting the
// end of the line or a non-selectable region.
if (atLineEdge && aDirection == eDirPrevious &&
traversedFrame->IsBrFrame()) {
for (nsIFrame* current = traversedFrame->GetPrevSibling(); current;
current = current->GetPrevSibling()) {
if (!current->IsBlockOutside() && IsSelectable(current)) {
if (!current->IsBrFrame()) {
result.mIgnoredBrFrame = true;
}
break;
}
}
if (result.mIgnoredBrFrame) {
continue;
}
}
selectable = IsSelectable(traversedFrame);
if (!selectable) {
if (traversedFrame->IsSelectable(nullptr)) {
result.mHasSelectableFrame = true;
}
result.mMovedOverNonSelectableText = true;
}
} // while (!selectable)
result.mOffset = (aDirection == eDirNext) ? 0 : -1;
if (aOptions.contains(PeekOffsetOption::Visual) &&
nsBidiPresUtils::IsReversedDirectionFrame(traversedFrame)) {
// The new frame is reverse-direction, go to the other end
result.mOffset = -1 - result.mOffset;
}
result.mFrame = traversedFrame;
return result;
}
nsIFrame::SelectablePeekReport nsIFrame::GetFrameFromDirection(
const PeekOffsetStruct& aPos) {
return GetFrameFromDirection(aPos.mDirection, aPos.mOptions);
}
nsView* nsIFrame::GetClosestView(nsPoint* aOffset) const {
nsPoint offset(0, 0);
for (const nsIFrame* f = this; f; f = f->GetParent()) {
if (f->HasView()) {
if (aOffset) {
*aOffset = offset;
}
return f->GetView();
}
offset += f->GetPosition();
}
MOZ_ASSERT_UNREACHABLE("No view on any parent? How did that happen?");
return nullptr;
}
/* virtual */
void nsIFrame::ChildIsDirty(nsIFrame* aChild) {
MOZ_ASSERT_UNREACHABLE(
"should never be called on a frame that doesn't "
"inherit from nsContainerFrame");
}
#ifdef ACCESSIBILITY
a11y::AccType nsIFrame::AccessibleType() {
if (IsTableCaption() && !GetRect().IsEmpty()) {
return a11y::eHTMLCaptionType;
}
return a11y::eNoType;
}
#endif
bool nsIFrame::ClearOverflowRects() {
if (mOverflow.mType == OverflowStorageType::None) {
return false;
}
if (mOverflow.mType == OverflowStorageType::Large) {
RemoveProperty(OverflowAreasProperty());
}
mOverflow.mType = OverflowStorageType::None;
return true;
}
bool nsIFrame::SetOverflowAreas(const OverflowAreas& aOverflowAreas) {
if (mOverflow.mType == OverflowStorageType::Large) {
OverflowAreas* overflow = GetOverflowAreasProperty();
bool changed = *overflow != aOverflowAreas;
*overflow = aOverflowAreas;
// Don't bother with converting to the deltas form if we already
// have a property.
return changed;
}
const nsRect& vis = aOverflowAreas.InkOverflow();
uint32_t l = -vis.x, // left edge: positive delta is leftwards
t = -vis.y, // top: positive is upwards
r = vis.XMost() - mRect.width, // right: positive is rightwards
b = vis.YMost() - mRect.height; // bottom: positive is downwards
if (aOverflowAreas.ScrollableOverflow().IsEqualEdges(
nsRect(nsPoint(0, 0), GetSize())) &&
l <= InkOverflowDeltas::kMax && t <= InkOverflowDeltas::kMax &&
r <= InkOverflowDeltas::kMax && b <= InkOverflowDeltas::kMax &&
// we have to check these against zero because we *never* want to
// set a frame as having no overflow in this function. This is
// because FinishAndStoreOverflow calls this function prior to
// SetRect based on whether the overflow areas match aNewSize.
// In the case where the overflow areas exactly match mRect but
// do not match aNewSize, we need to store overflow in a property
// so that our eventual SetRect/SetSize will know that it has to
// reset our overflow areas.
(l | t | r | b) != 0) {
InkOverflowDeltas oldDeltas = mOverflow.mInkOverflowDeltas;
// It's a "small" overflow area so we store the deltas for each edge
// directly in the frame, rather than allocating a separate rect.
// If they're all zero, that's fine; we're setting things to
// no-overflow.
mOverflow.mInkOverflowDeltas.mLeft = l;
mOverflow.mInkOverflowDeltas.mTop = t;
mOverflow.mInkOverflowDeltas.mRight = r;
mOverflow.mInkOverflowDeltas.mBottom = b;
// There was no scrollable overflow before, and there isn't now.
return oldDeltas != mOverflow.mInkOverflowDeltas;
} else {
bool changed =
!aOverflowAreas.ScrollableOverflow().IsEqualEdges(
nsRect(nsPoint(0, 0), GetSize())) ||
!aOverflowAreas.InkOverflow().IsEqualEdges(InkOverflowFromDeltas());
// it's a large overflow area that we need to store as a property
mOverflow.mType = OverflowStorageType::Large;
AddProperty(OverflowAreasProperty(), new OverflowAreas(aOverflowAreas));
return changed;
}
}
enum class ApplyTransform : bool { No, Yes };
/**
* Compute the outline inner rect (so without outline-width and outline-offset)
* of aFrame, maybe iterating over its descendants, in aFrame's coordinate space
* or its post-transform coordinate space (depending on aApplyTransform).
*/
static nsRect ComputeOutlineInnerRect(
nsIFrame* aFrame, ApplyTransform aApplyTransform, bool& aOutValid,
const nsSize* aSizeOverride = nullptr,
const OverflowAreas* aOverflowOverride = nullptr) {
const nsRect bounds(nsPoint(0, 0),
aSizeOverride ? *aSizeOverride : aFrame->GetSize());
// The SVG container frames besides SVGTextFrame do not maintain
// an accurate mRect. It will make the outline be larger than
// we expect, we need to make them narrow to their children's outline.
// aOutValid is set to false if the returned nsRect is not valid
// and should not be included in the outline rectangle.
aOutValid = !aFrame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT) ||
!aFrame->IsSVGContainerFrame() || aFrame->IsSVGTextFrame();
nsRect u;
if (!aFrame->FrameMaintainsOverflow()) {
return u;
}
// Start from our border-box, transformed. See comment below about
// transform of children.
bool doTransform =
aApplyTransform == ApplyTransform::Yes && aFrame->IsTransformed();
TransformReferenceBox boundsRefBox(nullptr, bounds);
if (doTransform) {
u = nsDisplayTransform::TransformRect(bounds, aFrame, boundsRefBox);
} else {
u = bounds;
}
if (aOutValid && !StaticPrefs::layout_outline_include_overflow()) {
return u;
}
// Only iterate through the children if the overflow areas suggest
// that we might need to, and if the frame doesn't clip its overflow
// anyway.
if (aOverflowOverride) {
if (!doTransform && bounds.IsEqualEdges(aOverflowOverride->InkOverflow()) &&
bounds.IsEqualEdges(aOverflowOverride->ScrollableOverflow())) {
return u;
}
} else {
if (!doTransform && bounds.IsEqualEdges(aFrame->InkOverflowRect()) &&
bounds.IsEqualEdges(aFrame->ScrollableOverflowRect())) {
return u;
}
}
const nsStyleDisplay* disp = aFrame->StyleDisplay();
LayoutFrameType fType = aFrame->Type();
if (fType == LayoutFrameType::ScrollContainer ||
fType == LayoutFrameType::ListControl ||
fType == LayoutFrameType::SVGOuterSVG) {
return u;
}
auto overflowClipAxes = aFrame->ShouldApplyOverflowClipping(disp);
auto overflowClipMargin = aFrame->OverflowClipMargin(overflowClipAxes);
if (overflowClipAxes == kPhysicalAxesBoth && overflowClipMargin == nsSize()) {
return u;
}
const nsStyleEffects* effects = aFrame->StyleEffects();
Maybe<nsRect> clipPropClipRect =
aFrame->GetClipPropClipRect(disp, effects, bounds.Size());
// Iterate over all children except pop-up, absolutely-positioned,
// float, and overflow ones.
const FrameChildListIDs skip = {
FrameChildListID::Absolute, FrameChildListID::Fixed,
FrameChildListID::Float, FrameChildListID::Overflow};
for (const auto& [list, listID] : aFrame->ChildLists()) {
if (skip.contains(listID)) {
continue;
}
for (nsIFrame* child : list) {
if (child->IsPlaceholderFrame()) {
continue;
}
// Note that passing ApplyTransform::Yes when
// child->Combines3DTransformWithAncestors() returns true is incorrect if
// our aApplyTransform is No... but the opposite would be as well.
// This is because elements within a preserve-3d scene are always
// transformed up to the top of the scene. This means we don't have a
// mechanism for getting a transform up to an intermediate point within
// the scene. We choose to over-transform rather than under-transform
// because this is consistent with other overflow areas.
bool validRect = true;
nsRect childRect =
ComputeOutlineInnerRect(child, ApplyTransform::Yes, validRect) +
child->GetPosition();
if (!validRect) {
continue;
}
if (clipPropClipRect) {
// Intersect with the clip before transforming.
childRect.IntersectRect(childRect, *clipPropClipRect);
}
// Note that we transform each child separately according to
// aFrame's transform, and then union, which gives a different
// (smaller) result from unioning and then transforming the
// union. This doesn't match the way we handle overflow areas
// with 2-D transforms, though it does match the way we handle
// overflow areas in preserve-3d 3-D scenes.
if (doTransform && !child->Combines3DTransformWithAncestors()) {
childRect =
nsDisplayTransform::TransformRect(childRect, aFrame, boundsRefBox);
}
// If a SVGContainer has a non-SVGContainer child, we assign
// its child's outline to this SVGContainer directly.
if (!aOutValid && validRect) {
u = childRect;
aOutValid = true;
} else {
u = u.UnionEdges(childRect);
}
}
}
if (!overflowClipAxes.isEmpty()) {
OverflowAreas::ApplyOverflowClippingOnRect(u, bounds, overflowClipAxes,
overflowClipMargin);
}
return u;
}
static void ComputeAndIncludeOutlineArea(nsIFrame* aFrame,
OverflowAreas& aOverflowAreas,
const nsSize& aNewSize) {
const nsStyleOutline* outline = aFrame->StyleOutline();
if (!outline->ShouldPaintOutline()) {
return;
}
// When the outline property is set on a :-moz-block-inside-inline-wrapper
// pseudo-element, it inherited that outline from the inline that was broken
// because it contained a block. In that case, we don't want a really wide
// outline if the block inside the inline is narrow, so union the actual
// contents of the anonymous blocks.
nsIFrame* frameForArea = aFrame;
do {
PseudoStyleType pseudoType = frameForArea->Style()->GetPseudoType();
if (pseudoType != PseudoStyleType::mozBlockInsideInlineWrapper) {
break;
}
// If we're done, we really want it and all its later siblings.
frameForArea = frameForArea->PrincipalChildList().FirstChild();
NS_ASSERTION(frameForArea, "anonymous block with no children?");
} while (frameForArea);
// Find the union of the border boxes of all descendants, or in
// the block-in-inline case, all descendants we care about.
//
// Note that the interesting perspective-related cases are taken
// care of by the code that handles those issues for overflow
// calling FinishAndStoreOverflow again, which in turn calls this
// function again. We still need to deal with preserve-3d a bit.
nsRect innerRect;
bool validRect = false;
if (frameForArea == aFrame) {
innerRect = ComputeOutlineInnerRect(aFrame, ApplyTransform::No, validRect,
&aNewSize, &aOverflowAreas);
} else {
for (; frameForArea; frameForArea = frameForArea->GetNextSibling()) {
nsRect r =
ComputeOutlineInnerRect(frameForArea, ApplyTransform::Yes, validRect);
// Adjust for offsets transforms up to aFrame's pre-transform
// (i.e., normal) coordinate space; see comments in
// UnionBorderBoxes for some of the subtlety here.
for (nsIFrame *f = frameForArea, *parent = f->GetParent();
/* see middle of loop */; f = parent, parent = f->GetParent()) {
r += f->GetPosition();
if (parent == aFrame) {
break;
}
if (parent->IsTransformed() && !f->Combines3DTransformWithAncestors()) {
TransformReferenceBox refBox(parent);
r = nsDisplayTransform::TransformRect(r, parent, refBox);
}
}
innerRect.UnionRect(innerRect, r);
}
}
// Keep this code in sync with nsDisplayOutline::GetInnerRect.
if (innerRect == aFrame->GetRectRelativeToSelf()) {
aFrame->RemoveProperty(nsIFrame::OutlineInnerRectProperty());
} else {
SetOrUpdateRectValuedProperty(aFrame, nsIFrame::OutlineInnerRectProperty(),
innerRect);
}
nsRect outerRect(innerRect);
outerRect.Inflate(outline->EffectiveOffsetFor(outerRect));
if (outline->mOutlineStyle.IsAuto()) {
nsPresContext* pc = aFrame->PresContext();
pc->Theme()->GetWidgetOverflow(pc->DeviceContext(), aFrame,
StyleAppearance::FocusOutline, &outerRect);
} else {
const nscoord width = outline->GetOutlineWidth();
outerRect.Inflate(width);
}
nsRect& vo = aOverflowAreas.InkOverflow();
vo = vo.UnionEdges(innerRect.Union(outerRect));
}
bool nsIFrame::FinishAndStoreOverflow(OverflowAreas& aOverflowAreas,
nsSize aNewSize, nsSize* aOldSize,
const nsStyleDisplay* aStyleDisplay) {
MOZ_ASSERT(FrameMaintainsOverflow(),
"Don't call - overflow rects not maintained on these SVG frames");
const nsStyleDisplay* disp = StyleDisplayWithOptionalParam(aStyleDisplay);
bool hasTransform = IsTransformed();
nsRect bounds(nsPoint(0, 0), aNewSize);
// Store the passed in overflow area if we are a preserve-3d frame or we have
// a transform, and it's not just the frame bounds.
if (hasTransform || Combines3DTransformWithAncestors()) {
if (!aOverflowAreas.InkOverflow().IsEqualEdges(bounds) ||
!aOverflowAreas.ScrollableOverflow().IsEqualEdges(bounds)) {
OverflowAreas* initial = GetProperty(nsIFrame::InitialOverflowProperty());
if (!initial) {
AddProperty(nsIFrame::InitialOverflowProperty(),
new OverflowAreas(aOverflowAreas));
} else if (initial != &aOverflowAreas) {
*initial = aOverflowAreas;
}
} else {
RemoveProperty(nsIFrame::InitialOverflowProperty());
}
#ifdef DEBUG
SetProperty(nsIFrame::DebugInitialOverflowPropertyApplied(), true);
#endif
} else {
#ifdef DEBUG
RemoveProperty(nsIFrame::DebugInitialOverflowPropertyApplied());
#endif
}
nsSize oldSize = mRect.Size();
bool sizeChanged = ((aOldSize ? *aOldSize : oldSize) != aNewSize);
// Our frame size may not have been computed and set yet, but code under
// functions such as ComputeEffectsRect (which we're about to call) use the
// values that are stored in our frame rect to compute their results. We
// need the results from those functions to be based on the frame size that
// we *will* have, so we temporarily set our frame size here before calling
// those functions.
//
// XXX Someone should document here why we revert the frame size before we
// return rather than just leaving it set.
//
// We pass false here to avoid invalidating display items for this temporary
// change. We sometimes reflow frames multiple times, with the final size
// being the same as the initial. The single call to SetSize after reflow is
// done will take care of invalidating display items if the size has actually
// changed.
SetSize(aNewSize, false);
const auto overflowClipAxes = ShouldApplyOverflowClipping(disp);
if (ChildrenHavePerspective(disp) && sizeChanged) {
RecomputePerspectiveChildrenOverflow(this);
if (overflowClipAxes != kPhysicalAxesBoth) {
aOverflowAreas.SetAllTo(bounds);
DebugOnly<bool> ok = ComputeCustomOverflow(aOverflowAreas);
// ComputeCustomOverflow() should not return false, when
// FrameMaintainsOverflow() returns true.
MOZ_ASSERT(ok, "FrameMaintainsOverflow() != ComputeCustomOverflow()");
UnionChildOverflow(aOverflowAreas);
}
}
// This is now called FinishAndStoreOverflow() instead of
// StoreOverflow() because frame-generic ways of adding overflow
// can happen here, e.g. CSS2 outline and native theme.
// If the overflow area width or height is nscoord_MAX, then a saturating
// union may have encountered an overflow, so the overflow may not contain the
// frame border-box. Don't warn in that case.
// Don't warn for SVG either, since SVG doesn't need the overflow area
// to contain the frame bounds.
#ifdef DEBUG
for (const auto otype : AllOverflowTypes()) {
const nsRect& r = aOverflowAreas.Overflow(otype);
NS_ASSERTION(aNewSize.width == 0 || aNewSize.height == 0 ||
r.width == nscoord_MAX || r.height == nscoord_MAX ||
HasAnyStateBits(NS_FRAME_SVG_LAYOUT) ||
r.Contains(nsRect(nsPoint(), aNewSize)),
"Computed overflow area must contain frame bounds");
}
#endif
// Overflow area must always include the frame's top-left and bottom-right,
// even if the frame rect is empty (so we can scroll to those positions).
const bool shouldIncludeBounds = [&] {
if (aNewSize.width == 0 && IsInlineFrame()) {
// zero width.
return false;
}
if (HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
// Do not do this for SVG either, since it will usually massively increase
// the area unnecessarily (except for SVG that applies clipping, since
// that's the pre-existing behavior, and breaks pre-rendering otherwise).
// for specific frame types at least.
return !overflowClipAxes.isEmpty();
}
return true;
}();
if (shouldIncludeBounds) {
for (const auto otype : AllOverflowTypes()) {
nsRect& o = aOverflowAreas.Overflow(otype);
o = o.UnionEdges(bounds);
}
}
// If we clip our children, clear accumulated overflow area in the affected
// dimension(s). The children are actually clipped to the padding-box, but
// since the overflow area should include the entire border-box, just set it
// to the border-box size here.
if (!overflowClipAxes.isEmpty()) {
aOverflowAreas.ApplyClipping(bounds, overflowClipAxes,
OverflowClipMargin(overflowClipAxes));
}
ComputeAndIncludeOutlineArea(this, aOverflowAreas, aNewSize);
// Nothing in here should affect scrollable overflow.
aOverflowAreas.InkOverflow() =
ComputeEffectsRect(this, aOverflowAreas.InkOverflow(), aNewSize);
// Absolute position clipping
const nsStyleEffects* effects = StyleEffects();
Maybe<nsRect> clipPropClipRect = GetClipPropClipRect(disp, effects, aNewSize);
if (clipPropClipRect) {
for (const auto otype : AllOverflowTypes()) {
nsRect& o = aOverflowAreas.Overflow(otype);
o.IntersectRect(o, *clipPropClipRect);
}
}
/* If we're transformed, transform the overflow rect by the current
* transformation. */
if (hasTransform) {
SetProperty(nsIFrame::PreTransformOverflowAreasProperty(),
new OverflowAreas(aOverflowAreas));
if (Combines3DTransformWithAncestors()) {
/* If we're a preserve-3d leaf frame, then our pre-transform overflow
* should be correct. Our post-transform overflow is empty though, because
* we only contribute to the overflow area of the preserve-3d root frame.
* If we're an intermediate frame then the pre-transform overflow should
* contain all our non-preserve-3d children, which is what we want. Again
* we have no post-transform overflow.
*/
aOverflowAreas.SetAllTo(nsRect());
} else {
TransformReferenceBox refBox(this);
for (const auto otype : AllOverflowTypes()) {
nsRect& o = aOverflowAreas.Overflow(otype);
o = nsDisplayTransform::TransformRect(o, this, refBox);
}
/* If we're the root of the 3d context, then we want to include the
* overflow areas of all the participants. This won't have happened yet as
* the code above set their overflow area to empty. Manually collect these
* overflow areas now.
*/
if (Extend3DContext(disp, effects)) {
ComputePreserve3DChildrenOverflow(aOverflowAreas);
}
}
} else {
RemoveProperty(nsIFrame::PreTransformOverflowAreasProperty());
}
/* Revert the size change in case some caller is depending on this. */
SetSize(oldSize, false);
bool anyOverflowChanged;
if (aOverflowAreas != OverflowAreas(bounds, bounds)) {
anyOverflowChanged = SetOverflowAreas(aOverflowAreas);
} else {
anyOverflowChanged = ClearOverflowRects();
}
if (anyOverflowChanged) {
SVGObserverUtils::InvalidateDirectRenderingObservers(this);
if (nsBlockFrame* block = do_QueryFrame(this)) {
// NOTE(emilio): we need to use BeforeReflow::Yes, because we want to
// invalidate in cases where we _used_ to have an overflow marker and no
// longer do.
if (TextOverflow::CanHaveOverflowMarkers(
block, TextOverflow::BeforeReflow::Yes)) {
DiscardDisplayItems(this, [](nsDisplayItem* aItem) {
return aItem->GetType() == DisplayItemType::TYPE_TEXT_OVERFLOW;
});
SchedulePaint(PAINT_DEFAULT);
}
}
}
return anyOverflowChanged;
}
void nsIFrame::RecomputePerspectiveChildrenOverflow(
const nsIFrame* aStartFrame) {
for (const auto& childList : ChildLists()) {
for (nsIFrame* child : childList.mList) {
if (!child->FrameMaintainsOverflow()) {
continue; // frame does not maintain overflow rects
}
if (child->HasPerspective()) {
OverflowAreas* overflow =
child->GetProperty(nsIFrame::InitialOverflowProperty());
nsRect bounds(nsPoint(0, 0), child->GetSize());
if (overflow) {
OverflowAreas overflowCopy = *overflow;
child->FinishAndStoreOverflow(overflowCopy, bounds.Size());
} else {
OverflowAreas boundsOverflow;
boundsOverflow.SetAllTo(bounds);
child->FinishAndStoreOverflow(boundsOverflow, bounds.Size());
}
} else if (child->GetContent() == aStartFrame->GetContent() ||
child->GetClosestFlattenedTreeAncestorPrimaryFrame() ==
aStartFrame) {
// If a frame is using perspective, then the size used to compute
// perspective-origin is the size of the frame belonging to its parent
// style. We must find any descendant frames using our size
// (by recursing into frames that have the same containing block)
// to update their overflow rects too.
child->RecomputePerspectiveChildrenOverflow(aStartFrame);
}
}
}
}
void nsIFrame::ComputePreserve3DChildrenOverflow(
OverflowAreas& aOverflowAreas) {
// Find all descendants that participate in the 3d context, and include their
// overflow. These descendants have an empty overflow, so won't have been
// included in the normal overflow calculation. Any children that don't
// participate have normal overflow, so will have been included already.
nsRect childVisual;
nsRect childScrollable;
for (const auto& childList : ChildLists()) {
for (nsIFrame* child : childList.mList) {
// If this child participates in the 3d context, then take the
// pre-transform region (which contains all descendants that aren't
// participating in the 3d context) and transform it into the 3d context
// root coordinate space.
if (child->Combines3DTransformWithAncestors()) {
OverflowAreas childOverflow = child->GetOverflowAreasRelativeToSelf();
TransformReferenceBox refBox(child);
for (const auto otype : AllOverflowTypes()) {
nsRect& o = childOverflow.Overflow(otype);
o = nsDisplayTransform::TransformRect(o, child, refBox);
}
aOverflowAreas.UnionWith(childOverflow);
// If this child also extends the 3d context, then recurse into it
// looking for more participants.
if (child->Extend3DContext()) {
child->ComputePreserve3DChildrenOverflow(aOverflowAreas);
}
}
}
}
}
bool nsIFrame::ZIndexApplies() const {
return StyleDisplay()->IsPositionedStyle() || IsFlexOrGridItem() ||
IsMenuPopupFrame();
}
Maybe<int32_t> nsIFrame::ZIndex() const {
if (!ZIndexApplies()) {
return Nothing();
}
const auto& zIndex = StylePosition()->mZIndex;
if (zIndex.IsAuto()) {
return Nothing();
}
return Some(zIndex.AsInteger());
}
bool nsIFrame::IsScrollAnchor(ScrollAnchorContainer** aOutContainer) {
if (!mInScrollAnchorChain) {
return false;
}
nsIFrame* f = this;
// make this just a `while (true)`, and uncomment the below assertion.
while (auto* container = ScrollAnchorContainer::FindFor(f)) {
// MOZ_ASSERT(f->IsInScrollAnchorChain());
if (nsIFrame* anchor = container->AnchorNode()) {
if (anchor != this) {
return false;
}
if (aOutContainer) {
*aOutContainer = container;
}
return true;
}
f = container->Frame();
}
return false;
}
bool nsIFrame::IsInScrollAnchorChain() const { return mInScrollAnchorChain; }
void nsIFrame::SetInScrollAnchorChain(bool aInChain) {
mInScrollAnchorChain = aInChain;
}
uint32_t nsIFrame::GetDepthInFrameTree() const {
uint32_t result = 0;
for (nsContainerFrame* ancestor = GetParent(); ancestor;
ancestor = ancestor->GetParent()) {
result++;
}
return result;
}
/**
* This function takes a frame that is part of a block-in-inline split,
* and _if_ that frame is an anonymous block created by an ib split it
* returns the block's preceding inline. This is needed because the
* split inline's style is the parent of the anonymous block's style.
*
* If aFrame is not an anonymous block, null is returned.
*/
static nsIFrame* GetIBSplitSiblingForAnonymousBlock(const nsIFrame* aFrame) {
MOZ_ASSERT(aFrame, "Must have a non-null frame!");
NS_ASSERTION(aFrame->HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT),
"GetIBSplitSibling should only be called on ib-split frames");
if (aFrame->Style()->GetPseudoType() !=
PseudoStyleType::mozBlockInsideInlineWrapper) {
// it's not an anonymous block
return nullptr;
}
// Find the first continuation of the frame. (Ugh. This ends up
// being O(N^2) when it is called O(N) times.)
aFrame = aFrame->FirstContinuation();
/*
* Now look up the nsGkAtoms::IBSplitPrevSibling
* property.
*/
nsIFrame* ibSplitSibling =
aFrame->GetProperty(nsIFrame::IBSplitPrevSibling());
NS_ASSERTION(ibSplitSibling, "Broken frame tree?");
return ibSplitSibling;
}
/**
* Get the parent, corrected for the mangled frame tree resulting from
* having a block within an inline. The result only differs from the
* result of |GetParent| when |GetParent| returns an anonymous block
* that was created for an element that was 'display: inline' because
* that element contained a block.
*
* Also skip anonymous scrolled-content parents; inherit directly from the
* outer scroll frame.
*
* Also skip NAC parents if the child frame is NAC.
*/
static nsIFrame* GetCorrectedParent(const nsIFrame* aFrame) {
nsIFrame* parent = aFrame->GetParent();
if (!parent) {
return nullptr;
}
// For a table caption we want the _inner_ table frame (unless it's anonymous)
// as the style parent.
if (aFrame->IsTableCaption()) {
nsIFrame* innerTable = parent->PrincipalChildList().FirstChild();
if (!innerTable->Style()->IsAnonBox()) {
return innerTable;
}
}
// Table wrappers are always anon boxes; if we're in here for an outer
// table, that actually means its the _inner_ table that wants to
// know its parent. So get the pseudo of the inner in that case.
auto pseudo = aFrame->Style()->GetPseudoType();
if (pseudo == PseudoStyleType::tableWrapper) {
pseudo =
aFrame->PrincipalChildList().FirstChild()->Style()->GetPseudoType();
}
// Prevent a NAC pseudo-element from inheriting from its NAC parent, and
// inherit from the NAC generator element instead.
if (pseudo != PseudoStyleType::NotPseudo) {
MOZ_ASSERT(aFrame->GetContent());
Element* element = Element::FromNode(aFrame->GetContent());
// Make sure to avoid doing the fixup for non-element-backed pseudos like
// ::first-line and such.
if (element && !element->IsRootOfNativeAnonymousSubtree() &&
element->GetPseudoElementType() == aFrame->Style()->GetPseudoType()) {
while (parent->GetContent() &&
!parent->GetContent()->IsRootOfNativeAnonymousSubtree()) {
parent = parent->GetInFlowParent();
}
parent = parent->GetInFlowParent();
}
}
return nsIFrame::CorrectStyleParentFrame(parent, pseudo);
}
/* static */
nsIFrame* nsIFrame::CorrectStyleParentFrame(nsIFrame* aProspectiveParent,
PseudoStyleType aChildPseudo) {
MOZ_ASSERT(aProspectiveParent, "Must have a prospective parent");
if (aChildPseudo != PseudoStyleType::NotPseudo) {
// Non-inheriting anon boxes have no style parent frame at all.
if (PseudoStyle::IsNonInheritingAnonBox(aChildPseudo)) {
return nullptr;
}
// Other anon boxes are parented to their actual parent already, except
// for non-elements. Those should not be treated as an anon box.
if (PseudoStyle::IsAnonBox(aChildPseudo) &&
!nsCSSAnonBoxes::IsNonElement(aChildPseudo)) {
NS_ASSERTION(aChildPseudo != PseudoStyleType::mozBlockInsideInlineWrapper,
"Should have dealt with kids that have "
"NS_FRAME_PART_OF_IBSPLIT elsewhere");
return aProspectiveParent;
}
}
// Otherwise, walk up out of all anon boxes. For placeholder frames, walk out
// of all pseudo-elements as well. Otherwise ReparentComputedStyle could
// cause style data to be out of sync with the frame tree.
nsIFrame* parent = aProspectiveParent;
do {
if (parent->HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT)) {
nsIFrame* sibling = GetIBSplitSiblingForAnonymousBlock(parent);
if (sibling) {
// |parent| was a block in an {ib} split; use the inline as
// |the style parent.
parent = sibling;
}
}
if (!parent->Style()->IsPseudoOrAnonBox()) {
return parent;
}
if (!parent->Style()->IsAnonBox() && aChildPseudo != PseudoStyleType::MAX) {
// nsPlaceholderFrame passes in PseudoStyleType::MAX for
// aChildPseudo (even though that's not a valid pseudo-type) just to
// trigger this behavior of walking up to the nearest non-pseudo
// ancestor.
return parent;
}
parent = parent->GetInFlowParent();
} while (parent);
if (aProspectiveParent->Style()->GetPseudoType() ==
PseudoStyleType::viewportScroll) {
// aProspectiveParent is the scrollframe for a viewport
// and the kids are the anonymous scrollbars
return aProspectiveParent;
}
// We can get here if the root element is absolutely positioned.
// We can't test for this very accurately, but it can only happen
// when the prospective parent is a canvas frame.
NS_ASSERTION(aProspectiveParent->IsCanvasFrame(),
"Should have found a parent before this");
return nullptr;
}
ComputedStyle* nsIFrame::DoGetParentComputedStyle(
nsIFrame** aProviderFrame) const {
*aProviderFrame = nullptr;
// Handle display:contents and the root frame, when there's no parent frame
// to inherit from.
if (MOZ_LIKELY(mContent)) {
Element* parentElement = mContent->GetFlattenedTreeParentElement();
if (MOZ_LIKELY(parentElement)) {
auto pseudo = Style()->GetPseudoType();
if (pseudo == PseudoStyleType::NotPseudo || !mContent->IsElement() ||
(!PseudoStyle::IsAnonBox(pseudo) &&
// Ensure that we don't return the display:contents style
// of the parent content for pseudos that have the same content
// as their primary frame (like -moz-list-bullets do):
IsPrimaryFrame()) ||
/* if next is true then it's really a request for the table frame's
parent context, see nsTable[Outer]Frame::GetParentComputedStyle. */
pseudo == PseudoStyleType::tableWrapper) {
// In some edge cases involving display: contents, we may end up here
// for something that's pending to be reframed. In this case we return
// the wrong style from here (because we've already lost track of it!),
// but it's not a big deal as we're going to be reframed anyway.
if (MOZ_LIKELY(parentElement->HasServoData()) &&
Servo_Element_IsDisplayContents(parentElement)) {
RefPtr<ComputedStyle> style =
ServoStyleSet::ResolveServoStyle(*parentElement);
// NOTE(emilio): we return a weak reference because the element also
// holds the style context alive. This is a bit silly (we could've
// returned a weak ref directly), but it's probably not worth
// optimizing, given this function has just one caller which is rare,
// and this path is rare itself.
return style;
}
}
} else {
if (Style()->GetPseudoType() == PseudoStyleType::NotPseudo) {
// We're a frame for the root. We have no style parent.
return nullptr;
}
}
}
if (!HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
/*
* If this frame is an anonymous block created when an inline with a block
* inside it got split, then the parent style is on its preceding inline. We
* can get to it using GetIBSplitSiblingForAnonymousBlock.
*/
if (HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT)) {
nsIFrame* ibSplitSibling = GetIBSplitSiblingForAnonymousBlock(this);
if (ibSplitSibling) {
return (*aProviderFrame = ibSplitSibling)->Style();
}
}
// If this frame is one of the blocks that split an inline, we must
// return the "special" inline parent, i.e., the parent that this
// frame would have if we didn't mangle the frame structure.
*aProviderFrame = GetCorrectedParent(this);
return *aProviderFrame ? (*aProviderFrame)->Style() : nullptr;
}
// We're an out-of-flow frame. For out-of-flow frames, we must
// resolve underneath the placeholder's parent. The placeholder is
// reached from the first-in-flow.
nsPlaceholderFrame* placeholder = FirstInFlow()->GetPlaceholderFrame();
if (!placeholder) {
MOZ_ASSERT_UNREACHABLE("no placeholder frame for out-of-flow frame");
*aProviderFrame = GetCorrectedParent(this);
return *aProviderFrame ? (*aProviderFrame)->Style() : nullptr;
}
return placeholder->GetParentComputedStyleForOutOfFlow(aProviderFrame);
}
void nsIFrame::GetLastLeaf(nsIFrame** aFrame) {
if (!aFrame || !*aFrame ||
// Don't enter into native anoymous subtree from the root like <input> or
// <textarea>.
(*aFrame)->ContentIsRootOfNativeAnonymousSubtree()) {
return;
}
for (nsIFrame* maybeLastLeaf = (*aFrame)->PrincipalChildList().LastChild();
maybeLastLeaf;) {
nsIFrame* lastChildNotInSubTree = nullptr;
for (nsIFrame* child = maybeLastLeaf; child;
child = child->GetPrevSibling()) {
// ignore anonymous elements, e.g. mozTableAdd* mozTableRemove*
if (!child->ContentIsRootOfNativeAnonymousSubtree()) {
lastChildNotInSubTree = child;
break;
}
}
if (!lastChildNotInSubTree) {
return;
}
*aFrame = lastChildNotInSubTree;
maybeLastLeaf = lastChildNotInSubTree->PrincipalChildList().LastChild();
}
}
void nsIFrame::GetFirstLeaf(nsIFrame** aFrame) {
if (!aFrame || !*aFrame) {
return;
}
nsIFrame* child = *aFrame;
while (true) {
child = child->PrincipalChildList().FirstChild();
if (!child) {
return; // nothing to do
}
*aFrame = child;
}
}
bool nsIFrame::IsFocusableDueToScrollFrame() {
if (!IsScrollContainerFrame()) {
if (nsFieldSetFrame* fieldset = do_QueryFrame(this)) {
// TODO: Do we have similar special-cases like this where we can have
// anonymous scrollable boxes hanging off a primary frame?
if (nsIFrame* inner = fieldset->GetInner()) {
return inner->IsFocusableDueToScrollFrame();
}
}
return false;
}
if (!mContent->IsHTMLElement()) {
return false;
}
if (mContent->IsRootOfNativeAnonymousSubtree()) {
return false;
}
if (!mContent->GetParent()) {
return false;
}
if (mContent->AsElement()->HasAttr(nsGkAtoms::tabindex)) {
return false;
}
// Elements with scrollable view are focusable with script & tabbable
// Otherwise you couldn't scroll them with keyboard, which is an accessibility
// issue (e.g. Section 508 rules) However, we don't make them to be focusable
// with the mouse, because the extra focus outlines are considered
// unnecessarily ugly. When clicked on, the selection position within the
// element will be enough to make them keyboard scrollable.
auto* scrollContainer = static_cast<ScrollContainerFrame*>(this);
if (scrollContainer->GetScrollStyles().IsHiddenInBothDirections()) {
return false;
}
if (scrollContainer->GetScrollRange().IsEqualEdges(nsRect())) {
return false;
}
return true;
}
Focusable nsIFrame::IsFocusable(IsFocusableFlags aFlags) {
// cannot focus content in print preview mode. Only the root can be focused,
// but that's handled elsewhere.
if (PresContext()->Type() == nsPresContext::eContext_PrintPreview) {
return {};
}
if (!mContent || !mContent->IsElement()) {
return {};
}
if (!(aFlags & IsFocusableFlags::IgnoreVisibility) &&
!IsVisibleConsideringAncestors()) {
return {};
}
const StyleUserFocus uf = StyleUI()->UserFocus();
if (uf == StyleUserFocus::None) {
return {};
}
MOZ_ASSERT(!StyleUI()->IsInert(), "inert implies -moz-user-focus: none");
const PseudoStyleType pseudo = Style()->GetPseudoType();
if (pseudo == PseudoStyleType::anonymousItem) {
return {};
}
Focusable focusable;
if (auto* xul = nsXULElement::FromNode(mContent)) {
// As a legacy special-case, -moz-user-focus controls focusability and
// tabability of XUL elements in some circumstances (which default to
// -moz-user-focus: ignore).
auto focusability = xul->GetXULFocusability(aFlags);
focusable.mFocusable =
focusability.mForcedFocusable.valueOr(uf == StyleUserFocus::Normal);
if (focusable) {
focusable.mTabIndex = focusability.mForcedTabIndexIfFocusable.valueOr(0);
}
} else {
focusable = mContent->IsFocusableWithoutStyle(aFlags);
}
if (focusable) {
return focusable;
}
// If we're focusing with the mouse we never focus scroll areas.
if (!(aFlags & IsFocusableFlags::WithMouse) &&
IsFocusableDueToScrollFrame()) {
return {true, 0};
}
// FIXME(emilio): some callers rely on somewhat broken return values
// (focusable = false, but non-negative tab-index) from
// IsFocusableWithoutStyle (for image maps in particular).
return focusable;
}
/**
* @return true if this text frame ends with a newline character which is
* treated as preformatted. It should return false if this is not a text frame.
*/
bool nsIFrame::HasSignificantTerminalNewline() const { return false; }
static StyleVerticalAlignKeyword ConvertSVGDominantBaselineToVerticalAlign(
StyleDominantBaseline aDominantBaseline) {
// Most of these are approximate mappings.
switch (aDominantBaseline) {
case StyleDominantBaseline::Hanging:
case StyleDominantBaseline::TextBeforeEdge:
return StyleVerticalAlignKeyword::TextTop;
case StyleDominantBaseline::TextAfterEdge:
case StyleDominantBaseline::Ideographic:
return StyleVerticalAlignKeyword::TextBottom;
case StyleDominantBaseline::Central:
case StyleDominantBaseline::Middle:
case StyleDominantBaseline::Mathematical:
return StyleVerticalAlignKeyword::Middle;
case StyleDominantBaseline::Auto:
case StyleDominantBaseline::Alphabetic:
return StyleVerticalAlignKeyword::Baseline;
default:
MOZ_ASSERT_UNREACHABLE("unexpected aDominantBaseline value");
return StyleVerticalAlignKeyword::Baseline;
}
}
Maybe<StyleVerticalAlignKeyword> nsIFrame::VerticalAlignEnum() const {
if (IsInSVGTextSubtree()) {
StyleDominantBaseline dominantBaseline = StyleSVG()->mDominantBaseline;
return Some(ConvertSVGDominantBaselineToVerticalAlign(dominantBaseline));
}
const auto& verticalAlign = StyleDisplay()->mVerticalAlign;
if (verticalAlign.IsKeyword()) {
return Some(verticalAlign.AsKeyword());
}
return Nothing();
}
void nsIFrame::UpdateStyleOfChildAnonBox(nsIFrame* aChildFrame,
ServoRestyleState& aRestyleState) {
#ifdef DEBUG
nsIFrame* parent = aChildFrame->GetInFlowParent();
if (aChildFrame->IsTableFrame()) {
parent = parent->GetParent();
}
if (parent->IsLineFrame()) {
parent = parent->GetParent();
}
MOZ_ASSERT(nsLayoutUtils::FirstContinuationOrIBSplitSibling(parent) == this,
"This should only be used for children!");
#endif // DEBUG
MOZ_ASSERT(!GetContent() || !aChildFrame->GetContent() ||
aChildFrame->GetContent() == GetContent(),
"What content node is it a frame for?");
MOZ_ASSERT(!aChildFrame->GetPrevContinuation(),
"Only first continuations should end up here");
// We could force the caller to pass in the pseudo, since some callers know it
// statically... But this API is a bit nicer.
auto pseudo = aChildFrame->Style()->GetPseudoType();
MOZ_ASSERT(PseudoStyle::IsAnonBox(pseudo), "Child is not an anon box?");
MOZ_ASSERT(!PseudoStyle::IsNonInheritingAnonBox(pseudo),
"Why did the caller bother calling us?");
// Anon boxes inherit from their parent; that's us.
RefPtr<ComputedStyle> newContext =
aRestyleState.StyleSet().ResolveInheritingAnonymousBoxStyle(pseudo,
Style());
nsChangeHint childHint =
UpdateStyleOfOwnedChildFrame(aChildFrame, newContext, aRestyleState);
// Now that we've updated the style on aChildFrame, check whether it itself
// has anon boxes to deal with.
ServoRestyleState childrenState(*aChildFrame, aRestyleState, childHint,
ServoRestyleState::CanUseHandledHints::Yes);
aChildFrame->UpdateStyleOfOwnedAnonBoxes(childrenState);
// Assuming anon boxes don't have ::backdrop associated with them... if that
// ever changes, we'd need to handle that here, like we do in
// RestyleManager::ProcessPostTraversal
// We do need to handle block pseudo-elements here, though. Especially list
// bullets.
if (nsBlockFrame* block = do_QueryFrame(aChildFrame)) {
block->UpdatePseudoElementStyles(childrenState);
}
}
/* static */
nsChangeHint nsIFrame::UpdateStyleOfOwnedChildFrame(
nsIFrame* aChildFrame, ComputedStyle* aNewComputedStyle,
ServoRestyleState& aRestyleState,
const Maybe<ComputedStyle*>& aContinuationComputedStyle) {
MOZ_ASSERT(!aChildFrame->GetAdditionalComputedStyle(0),
"We don't handle additional styles here");
// Figure out whether we have an actual change. It's important that we do
// this, for several reasons:
//
// 1) Even if all the child's changes are due to properties it inherits from
// us, it's possible that no one ever asked us for those style structs and
// hence changes to them aren't reflected in the changes handled at all.
//
// 2) Content can change stylesheets that change the styles of pseudos, and
// extensions can add/remove stylesheets that change the styles of
// anonymous boxes directly.
uint32_t equalStructs; // Not used, actually.
nsChangeHint childHint = aChildFrame->Style()->CalcStyleDifference(
*aNewComputedStyle, &equalStructs);
// If aChildFrame is out of flow, then aRestyleState's "changes handled by the
// parent" doesn't apply to it, because it may have some other parent in the
// frame tree.
if (!aChildFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
childHint = NS_RemoveSubsumedHints(
childHint, aRestyleState.ChangesHandledFor(aChildFrame));
}
if (childHint) {
if (childHint & nsChangeHint_ReconstructFrame) {
// If we generate a reconstruct here, remove any non-reconstruct hints we
// may have already generated for this content.
aRestyleState.ChangeList().PopChangesForContent(
aChildFrame->GetContent());
}
aRestyleState.ChangeList().AppendChange(
aChildFrame, aChildFrame->GetContent(), childHint);
}
aChildFrame->SetComputedStyle(aNewComputedStyle);
ComputedStyle* continuationStyle = aContinuationComputedStyle
? *aContinuationComputedStyle
: aNewComputedStyle;
for (nsIFrame* kid = aChildFrame->GetNextContinuation(); kid;
kid = kid->GetNextContinuation()) {
MOZ_ASSERT(!kid->GetAdditionalComputedStyle(0));
kid->SetComputedStyle(continuationStyle);
}
return childHint;
}
/* static */
void nsIFrame::AddInPopupStateBitToDescendants(nsIFrame* aFrame) {
if (!aFrame->HasAnyStateBits(NS_FRAME_IN_POPUP) &&
aFrame->TrackingVisibility()) {
// Assume all frames in popups are visible.
aFrame->IncApproximateVisibleCount();
}
aFrame->AddStateBits(NS_FRAME_IN_POPUP);
for (const auto& childList : aFrame->CrossDocChildLists()) {
for (nsIFrame* child : childList.mList) {
AddInPopupStateBitToDescendants(child);
}
}
}
/* static */
void nsIFrame::RemoveInPopupStateBitFromDescendants(nsIFrame* aFrame) {
if (!aFrame->HasAnyStateBits(NS_FRAME_IN_POPUP) ||
nsLayoutUtils::IsPopup(aFrame)) {
return;
}
aFrame->RemoveStateBits(NS_FRAME_IN_POPUP);
if (aFrame->TrackingVisibility()) {
// We assume all frames in popups are visible, so this decrement balances
// out the increment in AddInPopupStateBitToDescendants above.
aFrame->DecApproximateVisibleCount();
}
for (const auto& childList : aFrame->CrossDocChildLists()) {
for (nsIFrame* child : childList.mList) {
RemoveInPopupStateBitFromDescendants(child);
}
}
}
void nsIFrame::SetParent(nsContainerFrame* aParent) {
// If our parent is a wrapper anon box, our new parent should be too. We
// _can_ change parent if our parent is a wrapper anon box, because some
// wrapper anon boxes can have continuations.
MOZ_ASSERT_IF(ParentIsWrapperAnonBox(),
aParent->Style()->IsInheritingAnonBox());
// Note that the current mParent may already be destroyed at this point.
mParent = aParent;
MOZ_ASSERT(!mParent || PresShell() == mParent->PresShell());
if (HasAnyStateBits(NS_FRAME_HAS_VIEW | NS_FRAME_HAS_CHILD_WITH_VIEW)) {
for (nsIFrame* f = aParent;
f && !f->HasAnyStateBits(NS_FRAME_HAS_CHILD_WITH_VIEW);
f = f->GetParent()) {
f->AddStateBits(NS_FRAME_HAS_CHILD_WITH_VIEW);
}
}
if (HasAnyStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE)) {
for (nsIFrame* f = aParent; f; f = f->GetParent()) {
if (f->HasAnyStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE)) {
break;
}
f->AddStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE);
}
}
if (HasAnyStateBits(NS_FRAME_DESCENDANT_INTRINSIC_ISIZE_DEPENDS_ON_BSIZE)) {
for (nsIFrame* f = aParent; f; f = f->GetParent()) {
if (f->HasAnyStateBits(
NS_FRAME_DESCENDANT_INTRINSIC_ISIZE_DEPENDS_ON_BSIZE)) {
break;
}
f->AddStateBits(NS_FRAME_DESCENDANT_INTRINSIC_ISIZE_DEPENDS_ON_BSIZE);
}
}
if (HasInvalidFrameInSubtree()) {
for (nsIFrame* f = aParent;
f && !f->HasAnyStateBits(NS_FRAME_DESCENDANT_NEEDS_PAINT |
NS_FRAME_IS_NONDISPLAY);
f = nsLayoutUtils::GetCrossDocParentFrameInProcess(f)) {
f->AddStateBits(NS_FRAME_DESCENDANT_NEEDS_PAINT);
}
}
if (aParent->HasAnyStateBits(NS_FRAME_IN_POPUP)) {
AddInPopupStateBitToDescendants(this);
} else {
RemoveInPopupStateBitFromDescendants(this);
}
// If our new parent only has invalid children, then we just invalidate
// ourselves too. This is probably faster than clearing the flag all
// the way up the frame tree.
if (aParent->HasAnyStateBits(NS_FRAME_ALL_DESCENDANTS_NEED_PAINT)) {
InvalidateFrame();
} else {
SchedulePaint();
}
}
bool nsIFrame::IsStackingContext(const nsStyleDisplay* aStyleDisplay,
const nsStyleEffects* aStyleEffects) {
// Properties that influence the output of this function should be handled in
// change_bits_for_longhand as well.
if (HasOpacity(aStyleDisplay, aStyleEffects, nullptr)) {
return true;
}
if (IsTransformed()) {
return true;
}
auto willChange = aStyleDisplay->mWillChange.bits;
if (aStyleDisplay->IsContainPaint() || aStyleDisplay->IsContainLayout() ||
willChange & StyleWillChangeBits::CONTAIN) {
if (SupportsContainLayoutAndPaint()) {
return true;
}
}
// strictly speaking, 'perspective' doesn't require visual atomicity,
// but the spec says it acts like the rest of these
if (aStyleDisplay->HasPerspectiveStyle() ||
willChange & StyleWillChangeBits::PERSPECTIVE) {
if (SupportsCSSTransforms()) {
return true;
}
}
if (!StylePosition()->mZIndex.IsAuto() ||
willChange & StyleWillChangeBits::Z_INDEX) {
if (ZIndexApplies()) {
return true;
}
}
return aStyleEffects->mMixBlendMode != StyleBlend::Normal ||
SVGIntegrationUtils::UsingEffectsForFrame(this) ||
aStyleDisplay->IsPositionForcingStackingContext() ||
aStyleDisplay->mIsolation != StyleIsolation::Auto ||
willChange & StyleWillChangeBits::STACKING_CONTEXT_UNCONDITIONAL;
}
bool nsIFrame::IsStackingContext() {
return IsStackingContext(StyleDisplay(), StyleEffects());
}
static bool IsFrameRectScrolledOutOfView(const nsIFrame* aTarget,
const nsRect& aTargetRect,
const nsIFrame* aParent) {
// The ancestor frame we are checking if it clips out aTargetRect relative to
// aTarget.
nsIFrame* clipParent = nullptr;
// find the first scrollable frame or root frame if we are in a fixed pos
// subtree
for (nsIFrame* f = const_cast<nsIFrame*>(aParent); f;
f = nsLayoutUtils::GetCrossDocParentFrameInProcess(f)) {
ScrollContainerFrame* scrollContainerFrame = do_QueryFrame(f);
if (scrollContainerFrame) {
clipParent = f;
break;
}
if (f->StyleDisplay()->mPosition == StylePositionProperty::Fixed &&
nsLayoutUtils::IsReallyFixedPos(f)) {
clipParent = f->GetParent();
break;
}
}
if (!clipParent) {
// Even if we couldn't find the nearest scrollable frame, it might mean we
// are in an out-of-process iframe, try to see if |aTarget| frame is
// scrolled out of view in an scrollable frame in a cross-process ancestor
// document.
return nsLayoutUtils::FrameRectIsScrolledOutOfViewInCrossProcess(
aTarget, aTargetRect);
}
nsRect clipRect = clipParent->InkOverflowRectRelativeToSelf();
// We consider that the target is scrolled out if the scrollable (or root)
// frame is empty.
if (clipRect.IsEmpty()) {
return true;
}
nsRect transformedRect = nsLayoutUtils::TransformFrameRectToAncestor(
aTarget, aTargetRect, clipParent);
if (transformedRect.IsEmpty()) {
// If the transformed rect is empty it represents a line or a point that we
// should check is outside the the scrollable rect.
if (transformedRect.x > clipRect.XMost() ||
transformedRect.y > clipRect.YMost() ||
clipRect.x > transformedRect.XMost() ||
clipRect.y > transformedRect.YMost()) {
return true;
}
} else if (!transformedRect.Intersects(clipRect)) {
return true;
}
nsIFrame* parent = clipParent->GetParent();
if (!parent) {
return false;
}
return IsFrameRectScrolledOutOfView(clipParent, transformedRect, parent);
}
bool nsIFrame::IsScrolledOutOfView() const {
nsRect rect = InkOverflowRectRelativeToSelf();
return IsFrameRectScrolledOutOfView(this, rect, this);
}
gfx::Matrix nsIFrame::ComputeWidgetTransform() const {
const nsStyleUIReset* uiReset = StyleUIReset();
if (uiReset->mMozWindowTransform.IsNone()) {
return gfx::Matrix();
}
TransformReferenceBox refBox(nullptr, nsRect(nsPoint(), GetSize()));
int32_t appUnitsPerDevPixel = PresContext()->AppUnitsPerDevPixel();
gfx::Matrix4x4 matrix = nsStyleTransformMatrix::ReadTransforms(
uiReset->mMozWindowTransform, refBox, float(appUnitsPerDevPixel));
gfx::Matrix result2d;
if (!matrix.CanDraw2D(&result2d)) {
// FIXME: It would be preferable to reject non-2D transforms at parse time.
NS_WARNING(
"-moz-window-transform does not describe a 2D transform, "
"but only 2d transforms are supported");
return gfx::Matrix();
}
return result2d;
}
void nsIFrame::DoUpdateStyleOfOwnedAnonBoxes(ServoRestyleState& aRestyleState) {
// As a special case, we check for {ib}-split block frames here, rather
// than have an nsInlineFrame::AppendDirectlyOwnedAnonBoxes implementation
// that returns them.
//
// (If we did handle them in AppendDirectlyOwnedAnonBoxes, we would have to
// return *all* of the in-flow {ib}-split block frames, not just the first
// one. For restyling, we really just need the first in flow, and the other
// user of the AppendOwnedAnonBoxes API, AllChildIterator, doesn't need to
// know about them at all, since these block frames never create NAC. So we
// avoid any unncessary hashtable lookups for the {ib}-split frames by calling
// UpdateStyleOfOwnedAnonBoxesForIBSplit directly here.)
if (IsInlineFrame()) {
if (HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT)) {
static_cast<nsInlineFrame*>(this)->UpdateStyleOfOwnedAnonBoxesForIBSplit(
aRestyleState);
}
return;
}
AutoTArray<OwnedAnonBox, 4> frames;
AppendDirectlyOwnedAnonBoxes(frames);
for (OwnedAnonBox& box : frames) {
if (box.mUpdateStyleFn) {
box.mUpdateStyleFn(this, box.mAnonBoxFrame, aRestyleState);
} else {
UpdateStyleOfChildAnonBox(box.mAnonBoxFrame, aRestyleState);
}
}
}
/* virtual */
void nsIFrame::AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) {
MOZ_ASSERT(!HasAnyStateBits(NS_FRAME_OWNS_ANON_BOXES));
MOZ_ASSERT_UNREACHABLE(
"Subclasses that have directly owned anonymous boxes should override "
"this method!");
}
void nsIFrame::DoAppendOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) {
size_t i = aResult.Length();
AppendDirectlyOwnedAnonBoxes(aResult);
// After appending the directly owned anonymous boxes of this frame to
// aResult above, we need to check each of them to see if they own
// any anonymous boxes themselves. Note that we keep progressing
// through aResult, looking for additional entries in aResult from these
// subsequent AppendDirectlyOwnedAnonBoxes calls. (Thus we can't
// use a ranged for loop here.)
while (i < aResult.Length()) {
nsIFrame* f = aResult[i].mAnonBoxFrame;
if (f->HasAnyStateBits(NS_FRAME_OWNS_ANON_BOXES)) {
f->AppendDirectlyOwnedAnonBoxes(aResult);
}
++i;
}
}
nsIFrame::CaretPosition::CaretPosition() : mContentOffset(0) {}
nsIFrame::CaretPosition::~CaretPosition() = default;
bool nsIFrame::HasCSSAnimations() {
auto* collection = AnimationCollection<CSSAnimation>::Get(this);
return collection && !collection->mAnimations.IsEmpty();
}
bool nsIFrame::HasCSSTransitions() {
auto* collection = AnimationCollection<CSSTransition>::Get(this);
return collection && !collection->mAnimations.IsEmpty();
}
void nsIFrame::AddSizeOfExcludingThisForTree(nsWindowSizes& aSizes) const {
aSizes.mLayoutFramePropertiesSize +=
mProperties.SizeOfExcludingThis(aSizes.mState.mMallocSizeOf);
// We don't do this for Gecko because this stuff is stored in the nsPresArena
// and so measured elsewhere.
if (!aSizes.mState.HaveSeenPtr(mComputedStyle)) {
mComputedStyle->AddSizeOfIncludingThis(aSizes,
&aSizes.mLayoutComputedValuesNonDom);
}
// And our additional styles.
int32_t index = 0;
while (auto* extra = GetAdditionalComputedStyle(index++)) {
if (!aSizes.mState.HaveSeenPtr(extra)) {
extra->AddSizeOfIncludingThis(aSizes,
&aSizes.mLayoutComputedValuesNonDom);
}
}
for (const auto& childList : ChildLists()) {
for (const nsIFrame* f : childList.mList) {
f->AddSizeOfExcludingThisForTree(aSizes);
}
}
}
nsRect nsIFrame::GetCompositorHitTestArea(nsDisplayListBuilder* aBuilder) {
nsRect area;
ScrollContainerFrame* scrollContainerFrame =
nsLayoutUtils::GetScrollContainerFrameFor(this);
if (scrollContainerFrame) {
// If this frame is the scrolled frame of a scroll container frame, then we
// need to pick up the area corresponding to the overflow rect as well.
// Otherwise the parts of the overflow that are not occupied by descendants
// get skipped and the APZ code sends touch events to the content underneath
area = ScrollableOverflowRect();
} else {
area = GetRectRelativeToSelf();
}
if (!area.IsEmpty()) {
return area + aBuilder->ToReferenceFrame(this);
}
return area;
}
CompositorHitTestInfo nsIFrame::GetCompositorHitTestInfo(
nsDisplayListBuilder* aBuilder) {
CompositorHitTestInfo result = CompositorHitTestInvisibleToHit;
if (aBuilder->IsInsidePointerEventsNoneDoc()) {
// Somewhere up the parent document chain is a subdocument with pointer-
// events:none set on it.
return result;
}
if (!GetParent()) {
MOZ_ASSERT(IsViewportFrame());
// Viewport frames are never event targets, other frames, like canvas
// frames, are the event targets for any regions viewport frames may cover.
return result;
}
if (Style()->PointerEvents() == StylePointerEvents::None) {
return result;
}
if (!StyleVisibility()->IsVisible()) {
return result;
}
// Anything that didn't match the above conditions is visible to hit-testing.
result = CompositorHitTestFlags::eVisibleToHitTest;
SVGUtils::MaskUsage maskUsage = SVGUtils::DetermineMaskUsage(this, false);
if (maskUsage.UsingMaskOrClipPath()) {
// If WebRender is enabled, simple clip-paths can be converted into WR
// clips that WR knows how to hit-test against, so we don't need to mark
// it as an irregular area.
if (!maskUsage.IsSimpleClipShape()) {
result += CompositorHitTestFlags::eIrregularArea;
}
}
if (aBuilder->IsBuildingNonLayerizedScrollbar()) {
// Scrollbars may be painted into a layer below the actual layer they will
// scroll, and therefore wheel events may be dispatched to the outer frame
// instead of the intended scrollframe. To address this, we force a d-t-c
// region on scrollbar frames that won't be placed in their own layer. See
result += CompositorHitTestFlags::eInactiveScrollframe;
} else if (aBuilder->GetAncestorHasApzAwareEventHandler()) {
result += CompositorHitTestFlags::eApzAwareListeners;
} else if (IsRangeFrame()) {
// Range frames handle touch events directly without having a touch listener
// so we need to let APZ know that this area cares about events.
result += CompositorHitTestFlags::eApzAwareListeners;
}
if (aBuilder->IsTouchEventPrefEnabledDoc()) {
// Inherit the touch-action flags from the parent, if there is one. We do
// this because of how the touch-action on a frame combines the touch-action
// from ancestor DOM elements. Refer to the documentation in
// TouchActionHelper.cpp for details; this code is meant to be equivalent to
// that code, but woven into the top-down recursive display list building
// process.
CompositorHitTestInfo inheritedTouchAction =
aBuilder->GetCompositorHitTestInfo() & CompositorHitTestTouchActionMask;
nsIFrame* touchActionFrame = this;
if (ScrollContainerFrame* scrollContainerFrame =
nsLayoutUtils::GetScrollContainerFrameFor(this)) {
ScrollStyles ss = scrollContainerFrame->GetScrollStyles();
if (ss.mVertical != StyleOverflow::Hidden ||
ss.mHorizontal != StyleOverflow::Hidden) {
touchActionFrame = scrollContainerFrame;
// On scrollframes, stop inheriting the pan-x and pan-y flags; instead,
// reset them back to zero to allow panning on the scrollframe unless we
// encounter an element that disables it that's inside the scrollframe.
// This is equivalent to the |considerPanning| variable in
// TouchActionHelper.cpp, but for a top-down traversal.
CompositorHitTestInfo panMask(
CompositorHitTestFlags::eTouchActionPanXDisabled,
CompositorHitTestFlags::eTouchActionPanYDisabled);
inheritedTouchAction -= panMask;
}
}
result += inheritedTouchAction;
const StyleTouchAction touchAction = touchActionFrame->UsedTouchAction();
// The CSS allows the syntax auto | none | [pan-x || pan-y] | manipulation
// so we can eliminate some combinations of things.
if (touchAction == StyleTouchAction::AUTO) {
// nothing to do
} else if (touchAction & StyleTouchAction::MANIPULATION) {
result += CompositorHitTestFlags::eTouchActionAnimatingZoomDisabled;
} else {
// This path handles the cases none | [pan-x || pan-y || pinch-zoom] so
// double-tap is disabled in here.
if (!(touchAction & StyleTouchAction::PINCH_ZOOM)) {
result += CompositorHitTestFlags::eTouchActionPinchZoomDisabled;
}
result += CompositorHitTestFlags::eTouchActionAnimatingZoomDisabled;
if (!(touchAction & StyleTouchAction::PAN_X)) {
result += CompositorHitTestFlags::eTouchActionPanXDisabled;
}
if (!(touchAction & StyleTouchAction::PAN_Y)) {
result += CompositorHitTestFlags::eTouchActionPanYDisabled;
}
if (touchAction & StyleTouchAction::NONE) {
// all the touch-action disabling flags will already have been set above
MOZ_ASSERT(result.contains(CompositorHitTestTouchActionMask));
}
}
}
const Maybe<ScrollDirection> scrollDirection =
aBuilder->GetCurrentScrollbarDirection();
if (scrollDirection.isSome()) {
if (GetContent()->IsXULElement(nsGkAtoms::thumb)) {
const bool thumbGetsLayer = aBuilder->GetCurrentScrollbarTarget() !=
layers::ScrollableLayerGuid::NULL_SCROLL_ID;
if (thumbGetsLayer) {
result += CompositorHitTestFlags::eScrollbarThumb;
} else {
result += CompositorHitTestFlags::eInactiveScrollframe;
}
}
if (*scrollDirection == ScrollDirection::eVertical) {
result += CompositorHitTestFlags::eScrollbarVertical;
}
// includes the ScrollbarFrame, SliderFrame, anything else that
// might be inside the xul:scrollbar
result += CompositorHitTestFlags::eScrollbar;
}
return result;
}
// Returns true if we can guarantee there is no visible descendants.
static bool HasNoVisibleDescendants(const nsIFrame* aFrame) {
for (const auto& childList : aFrame->ChildLists()) {
for (nsIFrame* f : childList.mList) {
if (nsPlaceholderFrame::GetRealFrameFor(f)
->IsVisibleOrMayHaveVisibleDescendants()) {
return false;
}
}
}
return true;
}
void nsIFrame::UpdateVisibleDescendantsState() {
if (StyleVisibility()->IsVisible()) {
// Notify invisible ancestors that a visible descendant exists now.
nsIFrame* ancestor;
for (ancestor = GetInFlowParent();
ancestor && !ancestor->StyleVisibility()->IsVisible();
ancestor = ancestor->GetInFlowParent()) {
ancestor->mAllDescendantsAreInvisible = false;
}
} else {
mAllDescendantsAreInvisible = HasNoVisibleDescendants(this);
}
}
PhysicalAxes nsIFrame::ShouldApplyOverflowClipping(
const nsStyleDisplay* aDisp) const {
MOZ_ASSERT(aDisp == StyleDisplay(), "Wrong display struct");
// 'contain:paint', which we handle as 'overflow:clip' here. Except for
// scrollframes we don't need contain:paint to add any clipping, because
// the scrollable frame will already clip overflowing content, and because
// 'contain:paint' should prevent all means of escaping that clipping
// (e.g. because it forms a fixed-pos containing block).
if (aDisp->IsContainPaint() && !IsScrollContainerFrame() &&
SupportsContainLayoutAndPaint()) {
return kPhysicalAxesBoth;
}
// and overflow:hidden that we should interpret as clip
if (aDisp->mOverflowX == StyleOverflow::Hidden &&
aDisp->mOverflowY == StyleOverflow::Hidden) {
// REVIEW: these are the frame types that set up clipping.
LayoutFrameType type = Type();
switch (type) {
case LayoutFrameType::CheckboxRadio:
case LayoutFrameType::ComboboxControl:
case LayoutFrameType::HTMLButtonControl:
case LayoutFrameType::ListControl:
case LayoutFrameType::Meter:
case LayoutFrameType::Progress:
case LayoutFrameType::Range:
case LayoutFrameType::SubDocument:
case LayoutFrameType::SVGForeignObject:
case LayoutFrameType::SVGInnerSVG:
case LayoutFrameType::SVGOuterSVG:
case LayoutFrameType::SVGSymbol:
case LayoutFrameType::Table:
case LayoutFrameType::TableCell:
return kPhysicalAxesBoth;
case LayoutFrameType::TextInput:
// It has an anonymous scroll container frame that handles any overflow.
return PhysicalAxes();
default:
break;
}
}
// clip overflow:clip, except for nsListControlFrame which is
// a ScrollContainerFrame sub-class.
if (MOZ_UNLIKELY((aDisp->mOverflowX == mozilla::StyleOverflow::Clip ||
aDisp->mOverflowY == mozilla::StyleOverflow::Clip) &&
!IsListControlFrame())) {
// FIXME: we could use GetViewportScrollStylesOverrideElement() here instead
const auto* element = Element::FromNodeOrNull(GetContent());
if (!element ||
!PresContext()->ElementWouldPropagateScrollStyles(*element)) {
PhysicalAxes axes;
if (aDisp->mOverflowX == mozilla::StyleOverflow::Clip) {
axes += PhysicalAxis::Horizontal;
}
if (aDisp->mOverflowY == mozilla::StyleOverflow::Clip) {
axes += PhysicalAxis::Vertical;
}
return axes;
}
}
if (HasAnyStateBits(NS_FRAME_SVG_LAYOUT)) {
return PhysicalAxes();
}
return IsSuppressedScrollableBlockForPrint() ? kPhysicalAxesBoth
: PhysicalAxes();
}
bool nsIFrame::IsSuppressedScrollableBlockForPrint() const {
// This condition needs to match the suppressScrollFrame logic in the frame
// constructor.
if (!PresContext()->IsPaginated() || !IsBlockFrame() ||
!StyleDisplay()->IsScrollableOverflow() ||
!StyleDisplay()->IsBlockOutsideStyle() ||
mContent->IsInNativeAnonymousSubtree()) {
return false;
}
if (auto* element = Element::FromNode(mContent);
element && PresContext()->ElementWouldPropagateScrollStyles(*element)) {
return false;
}
return true;
}
bool nsIFrame::HasUnreflowedContainerQueryAncestor() const {
// If this frame has done the first reflow, its ancestors are guaranteed to
// have as well.
if (!HasAnyStateBits(NS_FRAME_FIRST_REFLOW) ||
!PresContext()->HasContainerQueryFrames()) {
return false;
}
for (nsIFrame* cur = GetInFlowParent(); cur; cur = cur->GetInFlowParent()) {
if (!cur->HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) {
// Done first reflow from this ancestor up, including query containers.
return false;
}
if (cur->StyleDisplay()->IsQueryContainer()) {
return true;
}
}
// No query container from this frame up to root.
return false;
}
bool nsIFrame::ShouldBreakBefore(
const ReflowInput::BreakType aBreakType) const {
const auto* display = StyleDisplay();
return ShouldBreakBetween(display, display->mBreakBefore, aBreakType);
}
bool nsIFrame::ShouldBreakAfter(const ReflowInput::BreakType aBreakType) const {
const auto* display = StyleDisplay();
return ShouldBreakBetween(display, display->mBreakAfter, aBreakType);
}
bool nsIFrame::ShouldBreakBetween(
const nsStyleDisplay* aDisplay, const StyleBreakBetween aBreakBetween,
const ReflowInput::BreakType aBreakType) const {
const bool shouldBreakBetween = [&] {
switch (aBreakBetween) {
case StyleBreakBetween::Always:
return true;
case StyleBreakBetween::Auto:
case StyleBreakBetween::Avoid:
return false;
case StyleBreakBetween::Page:
case StyleBreakBetween::Left:
case StyleBreakBetween::Right:
return aBreakType == ReflowInput::BreakType::Page;
}
MOZ_ASSERT_UNREACHABLE("Unknown break-between value!");
return false;
}();
if (!shouldBreakBetween) {
return false;
}
if (IsAbsolutelyPositioned(aDisplay)) {
// 'break-before' and 'break-after' properties does not apply to
// absolutely-positioned boxes.
return false;
}
return true;
}
#ifdef DEBUG
static void GetTagName(nsIFrame* aFrame, nsIContent* aContent, int aResultSize,
char* aResult) {
if (aContent) {
snprintf(aResult, aResultSize, "%s@%p",
nsAtomCString(aContent->NodeInfo()->NameAtom()).get(), aFrame);
} else {
snprintf(aResult, aResultSize, "@%p", aFrame);
}
}
void nsIFrame::Trace(const char* aMethod, bool aEnter) {
if (NS_FRAME_LOG_TEST(sFrameLogModule, NS_FRAME_TRACE_CALLS)) {
char tagbuf[40];
GetTagName(this, mContent, sizeof(tagbuf), tagbuf);
printf_stderr("%s: %s %s", tagbuf, aEnter ? "enter" : "exit", aMethod);
}
}
void nsIFrame::Trace(const char* aMethod, bool aEnter,
const nsReflowStatus& aStatus) {
if (NS_FRAME_LOG_TEST(sFrameLogModule, NS_FRAME_TRACE_CALLS)) {
char tagbuf[40];
GetTagName(this, mContent, sizeof(tagbuf), tagbuf);
printf_stderr("%s: %s %s, status=%scomplete%s", tagbuf,
aEnter ? "enter" : "exit", aMethod,
aStatus.IsIncomplete() ? "not" : "",
(aStatus.NextInFlowNeedsReflow()) ? "+reflow" : "");
}
}
void nsIFrame::TraceMsg(const char* aFormatString, ...) {
if (NS_FRAME_LOG_TEST(sFrameLogModule, NS_FRAME_TRACE_CALLS)) {
// Format arguments into a buffer
char argbuf[200];
va_list ap;
va_start(ap, aFormatString);
VsprintfLiteral(argbuf, aFormatString, ap);
va_end(ap);
char tagbuf[40];
GetTagName(this, mContent, sizeof(tagbuf), tagbuf);
printf_stderr("%s: %s", tagbuf, argbuf);
}
}
void nsIFrame::VerifyDirtyBitSet(const nsFrameList& aFrameList) {
for (nsIFrame* f : aFrameList) {
NS_ASSERTION(f->HasAnyStateBits(NS_FRAME_IS_DIRTY), "dirty bit not set");
}
}
// Validation of SideIsVertical.
# define CASE(side, result) \
static_assert(SideIsVertical(side) == result, "SideIsVertical is wrong")
CASE(eSideTop, false);
CASE(eSideRight, true);
CASE(eSideBottom, false);
CASE(eSideLeft, true);
# undef CASE
// Validation of HalfCornerIsX.
# define CASE(corner, result) \
static_assert(HalfCornerIsX(corner) == result, "HalfCornerIsX is wrong")
CASE(eCornerTopLeftX, true);
CASE(eCornerTopLeftY, false);
CASE(eCornerTopRightX, true);
CASE(eCornerTopRightY, false);
CASE(eCornerBottomRightX, true);
CASE(eCornerBottomRightY, false);
CASE(eCornerBottomLeftX, true);
CASE(eCornerBottomLeftY, false);
# undef CASE
// Validation of HalfToFullCorner.
# define CASE(corner, result) \
static_assert(HalfToFullCorner(corner) == result, \
"HalfToFullCorner is " \
"wrong")
CASE(eCornerTopLeftX, eCornerTopLeft);
CASE(eCornerTopLeftY, eCornerTopLeft);
CASE(eCornerTopRightX, eCornerTopRight);
CASE(eCornerTopRightY, eCornerTopRight);
CASE(eCornerBottomRightX, eCornerBottomRight);
CASE(eCornerBottomRightY, eCornerBottomRight);
CASE(eCornerBottomLeftX, eCornerBottomLeft);
CASE(eCornerBottomLeftY, eCornerBottomLeft);
# undef CASE
// Validation of FullToHalfCorner.
# define CASE(corner, vert, result) \
static_assert(FullToHalfCorner(corner, vert) == result, \
"FullToHalfCorner is wrong")
CASE(eCornerTopLeft, false, eCornerTopLeftX);
CASE(eCornerTopLeft, true, eCornerTopLeftY);
CASE(eCornerTopRight, false, eCornerTopRightX);
CASE(eCornerTopRight, true, eCornerTopRightY);
CASE(eCornerBottomRight, false, eCornerBottomRightX);
CASE(eCornerBottomRight, true, eCornerBottomRightY);
CASE(eCornerBottomLeft, false, eCornerBottomLeftX);
CASE(eCornerBottomLeft, true, eCornerBottomLeftY);
# undef CASE
// Validation of SideToFullCorner.
# define CASE(side, second, result) \
static_assert(SideToFullCorner(side, second) == result, \
"SideToFullCorner is wrong")
CASE(eSideTop, false, eCornerTopLeft);
CASE(eSideTop, true, eCornerTopRight);
CASE(eSideRight, false, eCornerTopRight);
CASE(eSideRight, true, eCornerBottomRight);
CASE(eSideBottom, false, eCornerBottomRight);
CASE(eSideBottom, true, eCornerBottomLeft);
CASE(eSideLeft, false, eCornerBottomLeft);
CASE(eSideLeft, true, eCornerTopLeft);
# undef CASE
// Validation of SideToHalfCorner.
# define CASE(side, second, parallel, result) \
static_assert(SideToHalfCorner(side, second, parallel) == result, \
"SideToHalfCorner is wrong")
CASE(eSideTop, false, true, eCornerTopLeftX);
CASE(eSideTop, false, false, eCornerTopLeftY);
CASE(eSideTop, true, true, eCornerTopRightX);
CASE(eSideTop, true, false, eCornerTopRightY);
CASE(eSideRight, false, false, eCornerTopRightX);
CASE(eSideRight, false, true, eCornerTopRightY);
CASE(eSideRight, true, false, eCornerBottomRightX);
CASE(eSideRight, true, true, eCornerBottomRightY);
CASE(eSideBottom, false, true, eCornerBottomRightX);
CASE(eSideBottom, false, false, eCornerBottomRightY);
CASE(eSideBottom, true, true, eCornerBottomLeftX);
CASE(eSideBottom, true, false, eCornerBottomLeftY);
CASE(eSideLeft, false, false, eCornerBottomLeftX);
CASE(eSideLeft, false, true, eCornerBottomLeftY);
CASE(eSideLeft, true, false, eCornerTopLeftX);
CASE(eSideLeft, true, true, eCornerTopLeftY);
# undef CASE
#endif