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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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
#include "AccEvent.h"
#include "LocalAccessible-inl.h"
#include "EmbeddedObjCollector.h"
#include "AccGroupInfo.h"
#include "AccIterator.h"
#include "CachedTableAccessible.h"
#include "CssAltContent.h"
#include "DocAccessible-inl.h"
#include "mozilla/a11y/AccAttributes.h"
#include "mozilla/a11y/DocAccessibleChild.h"
#include "mozilla/a11y/Platform.h"
#include "mozilla/FocusModel.h"
#include "nsAccUtils.h"
#include "nsAccessibilityService.h"
#include "ApplicationAccessible.h"
#include "nsGenericHTMLElement.h"
#include "NotificationController.h"
#include "nsEventShell.h"
#include "nsTextEquivUtils.h"
#include "EventTree.h"
#include "OuterDocAccessible.h"
#include "Pivot.h"
#include "Relation.h"
#include "mozilla/a11y/Role.h"
#include "RootAccessible.h"
#include "States.h"
#include "TextLeafRange.h"
#include "TextRange.h"
#include "HTMLElementAccessibles.h"
#include "HTMLSelectAccessible.h"
#include "HTMLTableAccessible.h"
#include "ImageAccessible.h"
#include "nsComputedDOMStyle.h"
#include "nsGkAtoms.h"
#include "nsIDOMXULButtonElement.h"
#include "nsIDOMXULSelectCntrlEl.h"
#include "nsIDOMXULSelectCntrlItemEl.h"
#include "nsINodeList.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/HTMLFormElement.h"
#include "mozilla/dom/HTMLAnchorElement.h"
#include "mozilla/gfx/Matrix.h"
#include "nsIContent.h"
#include "nsIFormControl.h"
#include "nsDisplayList.h"
#include "nsLayoutUtils.h"
#include "nsPresContext.h"
#include "nsIFrame.h"
#include "nsTextFrame.h"
#include "nsView.h"
#include "nsIDocShellTreeItem.h"
#include "nsStyleStructInlines.h"
#include "nsFocusManager.h"
#include "nsString.h"
#include "nsAtom.h"
#include "nsContainerFrame.h"
#include "mozilla/Assertions.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/PresShell.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/ScrollContainerFrame.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/StaticPrefs_ui.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLLabelElement.h"
#include "mozilla/dom/KeyboardEventBinding.h"
#include "mozilla/dom/TreeWalker.h"
#include "mozilla/dom/UserActivation.h"
#include "mozilla/dom/MutationEventBinding.h"
using namespace mozilla;
using namespace mozilla::a11y;
////////////////////////////////////////////////////////////////////////////////
// LocalAccessible: nsISupports and cycle collection
NS_IMPL_CYCLE_COLLECTION_CLASS(LocalAccessible)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(LocalAccessible)
tmp->Shutdown();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(LocalAccessible)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mContent, mDoc)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(LocalAccessible)
NS_INTERFACE_MAP_ENTRY_CONCRETE(LocalAccessible)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, LocalAccessible)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(LocalAccessible)
NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_DESTROY(LocalAccessible, LastRelease())
LocalAccessible::LocalAccessible(nsIContent* aContent, DocAccessible* aDoc)
: mContent(aContent),
mDoc(aDoc),
mParent(nullptr),
mIndexInParent(-1),
mFirstLineStart(-1),
mStateFlags(0),
mContextFlags(0),
mReorderEventTarget(false),
mShowEventTarget(false),
mHideEventTarget(false),
mIndexOfEmbeddedChild(-1),
mGroupInfo(nullptr) {}
LocalAccessible::~LocalAccessible() {
NS_ASSERTION(!mDoc, "LastRelease was never called!?!");
}
ENameValueFlag LocalAccessible::Name(nsString& aName) const {
aName.Truncate();
if (!HasOwnContent()) return eNameOK;
ARIAName(aName);
if (!aName.IsEmpty()) return eNameOK;
ENameValueFlag nameFlag = NativeName(aName);
if (!aName.IsEmpty()) return nameFlag;
// In the end get the name from tooltip.
if (mContent->IsHTMLElement()) {
if (mContent->AsElement()->GetAttr(nsGkAtoms::title, aName)) {
aName.CompressWhitespace();
return eNameFromTooltip;
}
} else if (mContent->IsXULElement()) {
if (mContent->AsElement()->GetAttr(nsGkAtoms::tooltiptext, aName)) {
aName.CompressWhitespace();
return eNameFromTooltip;
}
} else if (mContent->IsSVGElement()) {
// If user agents need to choose among multiple 'desc' or 'title'
// elements for processing, the user agent shall choose the first one.
for (nsIContent* childElm = mContent->GetFirstChild(); childElm;
childElm = childElm->GetNextSibling()) {
if (childElm->IsSVGElement(nsGkAtoms::desc)) {
nsTextEquivUtils::AppendTextEquivFromContent(this, childElm, &aName);
return eNameFromTooltip;
}
}
}
if (auto cssAlt = CssAltContent(mContent)) {
cssAlt.AppendToString(aName);
return eNameOK;
}
aName.SetIsVoid(true);
return nameFlag;
}
void LocalAccessible::Description(nsString& aDescription) const {
// There are 4 conditions that make an accessible have no accDescription:
// 1. it's a text node; or
// 2. It has no ARIA describedby or description property
// 3. it doesn't have an accName; or
// 4. its title attribute already equals to its accName nsAutoString name;
if (!HasOwnContent() || mContent->IsText()) return;
ARIADescription(aDescription);
if (aDescription.IsEmpty()) {
NativeDescription(aDescription);
if (aDescription.IsEmpty()) {
// Keep the Name() method logic.
if (mContent->IsHTMLElement()) {
mContent->AsElement()->GetAttr(nsGkAtoms::title, aDescription);
} else if (mContent->IsXULElement()) {
mContent->AsElement()->GetAttr(nsGkAtoms::tooltiptext, aDescription);
} else if (mContent->IsSVGElement()) {
for (nsIContent* childElm = mContent->GetFirstChild(); childElm;
childElm = childElm->GetNextSibling()) {
if (childElm->IsSVGElement(nsGkAtoms::desc)) {
nsTextEquivUtils::AppendTextEquivFromContent(this, childElm,
&aDescription);
break;
}
}
}
}
}
if (!aDescription.IsEmpty()) {
aDescription.CompressWhitespace();
nsAutoString name;
Name(name);
// Don't expose a description if it is the same as the name.
if (aDescription.Equals(name)) aDescription.Truncate();
}
}
KeyBinding LocalAccessible::AccessKey() const {
if (!HasOwnContent()) return KeyBinding();
uint32_t key = nsCoreUtils::GetAccessKeyFor(mContent);
if (!key && mContent->IsElement()) {
LocalAccessible* label = nullptr;
// Copy access key from label node.
if (mContent->IsHTMLElement()) {
// Unless it is labeled via an ancestor <label>, in which case that would
// be redundant.
HTMLLabelIterator iter(Document(), this,
HTMLLabelIterator::eSkipAncestorLabel);
label = iter.Next();
}
if (!label) {
XULLabelIterator iter(Document(), mContent);
label = iter.Next();
}
if (label) key = nsCoreUtils::GetAccessKeyFor(label->GetContent());
}
if (!key) return KeyBinding();
// Get modifier mask. Use ui.key.generalAccessKey (unless it is -1).
switch (StaticPrefs::ui_key_generalAccessKey()) {
case -1:
break;
case dom::KeyboardEvent_Binding::DOM_VK_SHIFT:
return KeyBinding(key, KeyBinding::kShift);
case dom::KeyboardEvent_Binding::DOM_VK_CONTROL:
return KeyBinding(key, KeyBinding::kControl);
case dom::KeyboardEvent_Binding::DOM_VK_ALT:
return KeyBinding(key, KeyBinding::kAlt);
case dom::KeyboardEvent_Binding::DOM_VK_META:
return KeyBinding(key, KeyBinding::kMeta);
default:
return KeyBinding();
}
// Determine the access modifier used in this context.
dom::Document* document = mContent->GetComposedDoc();
if (!document) return KeyBinding();
nsCOMPtr<nsIDocShellTreeItem> treeItem(document->GetDocShell());
if (!treeItem) return KeyBinding();
nsresult rv = NS_ERROR_FAILURE;
int32_t modifierMask = 0;
switch (treeItem->ItemType()) {
case nsIDocShellTreeItem::typeChrome:
modifierMask = StaticPrefs::ui_key_chromeAccess();
rv = NS_OK;
break;
case nsIDocShellTreeItem::typeContent:
modifierMask = StaticPrefs::ui_key_contentAccess();
rv = NS_OK;
break;
}
return NS_SUCCEEDED(rv) ? KeyBinding(key, modifierMask) : KeyBinding();
}
KeyBinding LocalAccessible::KeyboardShortcut() const { return KeyBinding(); }
uint64_t LocalAccessible::VisibilityState() const {
if (IPCAccessibilityActive()) {
// Visibility states must be calculated by RemoteAccessible, so there's no
// point calculating them here.
return 0;
}
nsIFrame* frame = GetFrame();
if (!frame) {
// Element having display:contents is considered visible semantically,
// despite it doesn't have a visually visible box.
if (nsCoreUtils::IsDisplayContents(mContent)) {
return states::OFFSCREEN;
}
return states::INVISIBLE;
}
if (!frame->StyleVisibility()->IsVisible()) return states::INVISIBLE;
// It's invisible if the presshell is hidden by a visibility:hidden element in
// an ancestor document.
if (frame->PresShell()->IsUnderHiddenEmbedderElement()) {
return states::INVISIBLE;
}
// Offscreen state if the document's visibility state is not visible.
if (Document()->IsHidden()) return states::OFFSCREEN;
// Walk the parent frame chain to see if the frame is in background tab or
// scrolled out.
nsIFrame* curFrame = frame;
do {
nsView* view = curFrame->GetView();
if (view && view->GetVisibility() == ViewVisibility::Hide) {
return states::INVISIBLE;
}
if (nsLayoutUtils::IsPopup(curFrame)) {
return 0;
}
if (curFrame->StyleUIReset()->mMozSubtreeHiddenOnlyVisually) {
// Offscreen state for background tab content.
return states::OFFSCREEN;
}
nsIFrame* parentFrame = curFrame->GetParent();
// If contained by scrollable frame then check that at least 12 pixels
// around the object is visible, otherwise the object is offscreen.
const nscoord kMinPixels = nsPresContext::CSSPixelsToAppUnits(12);
if (ScrollContainerFrame* scrollContainerFrame =
do_QueryFrame(parentFrame)) {
nsRect scrollPortRect = scrollContainerFrame->GetScrollPortRect();
nsRect frameRect = nsLayoutUtils::TransformFrameRectToAncestor(
frame, frame->GetRectRelativeToSelf(), parentFrame);
if (!scrollPortRect.Contains(frameRect)) {
scrollPortRect.Deflate(kMinPixels, kMinPixels);
if (!scrollPortRect.Intersects(frameRect)) return states::OFFSCREEN;
}
}
if (!parentFrame) {
parentFrame = nsLayoutUtils::GetCrossDocParentFrameInProcess(curFrame);
// Even if we couldn't find the parent frame, it might mean we are in an
// out-of-process iframe, try to see if |frame| is scrolled out in an
// scrollable frame in a cross-process ancestor document.
if (!parentFrame &&
nsLayoutUtils::FrameIsMostlyScrolledOutOfViewInCrossProcess(
frame, kMinPixels)) {
return states::OFFSCREEN;
}
}
curFrame = parentFrame;
} while (curFrame);
// Zero area rects can occur in the first frame of a multi-frame text flow,
// in which case the rendered text is not empty and the frame should not be
// marked invisible.
// XXX Can we just remove this check? Why do we need to mark empty
// text invisible?
if (frame->IsTextFrame() && !frame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) &&
frame->GetRect().IsEmpty()) {
nsIFrame::RenderedText text = frame->GetRenderedText(
0, UINT32_MAX, nsIFrame::TextOffsetType::OffsetsInContentText,
nsIFrame::TrailingWhitespace::DontTrim);
if (text.mString.IsEmpty()) {
return states::INVISIBLE;
}
}
return 0;
}
uint64_t LocalAccessible::NativeState() const {
uint64_t state = 0;
if (!IsInDocument()) state |= states::STALE;
if (HasOwnContent() && mContent->IsElement()) {
dom::ElementState elementState = mContent->AsElement()->State();
if (elementState.HasState(dom::ElementState::INVALID)) {
state |= states::INVALID;
}
if (elementState.HasState(dom::ElementState::REQUIRED)) {
state |= states::REQUIRED;
}
state |= NativeInteractiveState();
}
// Gather states::INVISIBLE and states::OFFSCREEN flags for this object.
state |= VisibilityState();
nsIFrame* frame = GetFrame();
if (frame && frame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW)) {
state |= states::FLOATING;
}
// Check if a XUL element has the popup attribute (an attached popup menu).
if (HasOwnContent() && mContent->IsXULElement() &&
mContent->AsElement()->HasAttr(nsGkAtoms::popup)) {
state |= states::HASPOPUP;
}
// Bypass the link states specialization for non links.
const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
if (!roleMapEntry || roleMapEntry->roleRule == kUseNativeRole ||
roleMapEntry->role == roles::LINK) {
state |= NativeLinkState();
}
return state;
}
uint64_t LocalAccessible::NativeInteractiveState() const {
if (!mContent->IsElement()) return 0;
if (NativelyUnavailable()) return states::UNAVAILABLE;
nsIFrame* frame = GetFrame();
auto flags = IsFocusableFlags(0);
// If we're caching this remote document in the parent process, we
// need to cache focusability irrespective of visibility. Otherwise,
// if this document is invisible when it first loads, we'll cache that
// all descendants are unfocusable and this won't get updated when the
// document becomes visible. Even if we did get notified when the
// document becomes visible, it would be wasteful to walk the entire
// tree to figure out what is now focusable and push cache updates.
// Although ignoring visibility means IsFocusable will return true for
// visibility: hidden, etc., this isn't a problem because we don't include
// those hidden elements in the a11y tree anyway.
if (mDoc->IPCDoc()) {
flags |= IsFocusableFlags::IgnoreVisibility;
}
if (frame && frame->IsFocusable(flags)) {
return states::FOCUSABLE;
}
return 0;
}
uint64_t LocalAccessible::NativeLinkState() const { return 0; }
bool LocalAccessible::NativelyUnavailable() const {
if (mContent->IsHTMLElement()) return mContent->AsElement()->IsDisabled();
return mContent->IsElement() && mContent->AsElement()->AttrValueIs(
kNameSpaceID_None, nsGkAtoms::disabled,
nsGkAtoms::_true, eCaseMatters);
}
Accessible* LocalAccessible::ChildAtPoint(int32_t aX, int32_t aY,
EWhichChildAtPoint aWhichChild) {
Accessible* child = LocalChildAtPoint(aX, aY, aWhichChild);
if (aWhichChild != EWhichChildAtPoint::DirectChild && child &&
child->IsOuterDoc()) {
child = child->ChildAtPoint(aX, aY, aWhichChild);
}
return child;
}
LocalAccessible* LocalAccessible::LocalChildAtPoint(
int32_t aX, int32_t aY, EWhichChildAtPoint aWhichChild) {
// If we can't find the point in a child, we will return the fallback answer:
// we return |this| if the point is within it, otherwise nullptr.
LocalAccessible* fallbackAnswer = nullptr;
LayoutDeviceIntRect rect = Bounds();
if (rect.Contains(aX, aY)) fallbackAnswer = this;
if (nsAccUtils::MustPrune(this)) { // Do not dig any further
return fallbackAnswer;
}
// Search an accessible at the given point starting from accessible document
// because containing block (see CSS2) for out of flow element (for example,
// absolutely positioned element) may be different from its DOM parent and
// therefore accessible for containing block may be different from accessible
// for DOM parent but GetFrameForPoint() should be called for containing block
// to get an out of flow element.
DocAccessible* accDocument = Document();
NS_ENSURE_TRUE(accDocument, nullptr);
nsIFrame* rootFrame = accDocument->GetFrame();
NS_ENSURE_TRUE(rootFrame, nullptr);
nsIFrame* startFrame = rootFrame;
// Check whether the point is at popup content.
nsIWidget* rootWidget = rootFrame->GetView()->GetNearestWidget(nullptr);
NS_ENSURE_TRUE(rootWidget, nullptr);
LayoutDeviceIntRect rootRect = rootWidget->GetScreenBounds();
auto point = LayoutDeviceIntPoint(aX - rootRect.X(), aY - rootRect.Y());
nsIFrame* popupFrame = nsLayoutUtils::GetPopupFrameForPoint(
accDocument->PresContext()->GetRootPresContext(), rootWidget, point);
if (popupFrame) {
// If 'this' accessible is not inside the popup then ignore the popup when
// searching an accessible at point.
DocAccessible* popupDoc =
GetAccService()->GetDocAccessible(popupFrame->GetContent()->OwnerDoc());
LocalAccessible* popupAcc =
popupDoc->GetAccessibleOrContainer(popupFrame->GetContent());
LocalAccessible* popupChild = this;
while (popupChild && !popupChild->IsDoc() && popupChild != popupAcc) {
popupChild = popupChild->LocalParent();
}
if (popupChild == popupAcc) startFrame = popupFrame;
}
nsPresContext* presContext = startFrame->PresContext();
nsRect screenRect = startFrame->GetScreenRectInAppUnits();
nsPoint offset(presContext->DevPixelsToAppUnits(aX) - screenRect.X(),
presContext->DevPixelsToAppUnits(aY) - screenRect.Y());
nsIFrame* foundFrame = nsLayoutUtils::GetFrameForPoint(
RelativeTo{startFrame, ViewportType::Visual}, offset);
nsIContent* content = nullptr;
if (!foundFrame || !(content = foundFrame->GetContent())) {
return fallbackAnswer;
}
// Get accessible for the node with the point or the first accessible in
// the DOM parent chain.
DocAccessible* contentDocAcc =
GetAccService()->GetDocAccessible(content->OwnerDoc());
NS_ASSERTION(contentDocAcc, "could not get the document accessible");
if (!contentDocAcc) return fallbackAnswer;
LocalAccessible* accessible =
contentDocAcc->GetAccessibleOrContainer(content);
if (!accessible) return fallbackAnswer;
// Hurray! We have an accessible for the frame that layout gave us.
// Since DOM node of obtained accessible may be out of flow then we should
// ensure obtained accessible is a child of this accessible.
LocalAccessible* child = accessible;
while (child != this) {
LocalAccessible* parent = child->LocalParent();
if (!parent) {
// Reached the top of the hierarchy. These bounds were inside an
// accessible that is not a descendant of this one.
return fallbackAnswer;
}
// If we landed on a legitimate child of |this|, and we want the direct
// child, return it here.
if (parent == this && aWhichChild == EWhichChildAtPoint::DirectChild) {
return child;
}
child = parent;
}
// Manually walk through accessible children and see if the are within this
// point. Skip offscreen or invisible accessibles. This takes care of cases
// where layout won't walk into things for us, such as image map areas and
// sub documents (XXX: subdocuments should be handled by methods of
// OuterDocAccessibles).
uint32_t childCount = accessible->ChildCount();
if (childCount == 1 && accessible->IsOuterDoc() &&
accessible->FirstChild()->IsRemote()) {
// No local children.
return accessible;
}
for (uint32_t childIdx = 0; childIdx < childCount; childIdx++) {
LocalAccessible* child = accessible->LocalChildAt(childIdx);
LayoutDeviceIntRect childRect = child->Bounds();
if (childRect.Contains(aX, aY) &&
(child->State() & states::INVISIBLE) == 0) {
if (aWhichChild == EWhichChildAtPoint::DeepestChild) {
return child->LocalChildAtPoint(aX, aY,
EWhichChildAtPoint::DeepestChild);
}
return child;
}
}
return accessible;
}
nsIFrame* LocalAccessible::FindNearestAccessibleAncestorFrame() {
nsIFrame* frame = GetFrame();
if (frame->StyleDisplay()->mPosition == StylePositionProperty::Fixed &&
nsLayoutUtils::IsReallyFixedPos(frame)) {
return mDoc->PresShellPtr()->GetRootFrame();
}
if (IsDoc()) {
// We bound documents by their own frame, which is their PresShell's root
// frame. We cache the document offset elsewhere in BundleFieldsForCache
// using the nsGkAtoms::crossorigin attribute.
MOZ_ASSERT(frame, "DocAccessibles should always have a frame");
return frame;
}
// Iterate through accessible's ancestors to find one with a frame.
LocalAccessible* ancestor = mParent;
while (ancestor) {
if (nsIFrame* boundingFrame = ancestor->GetFrame()) {
return boundingFrame;
}
ancestor = ancestor->LocalParent();
}
MOZ_ASSERT_UNREACHABLE("No ancestor with frame?");
return nsLayoutUtils::GetContainingBlockForClientRect(frame);
}
nsRect LocalAccessible::ParentRelativeBounds() {
nsIFrame* frame = GetFrame();
if (frame && mContent) {
nsIFrame* boundingFrame = FindNearestAccessibleAncestorFrame();
nsRect result = nsLayoutUtils::GetAllInFlowRectsUnion(frame, boundingFrame);
if (result.IsEmpty()) {
// If we end up with a 0x0 rect from above (or one with negative
// height/width) we should try using the ink overflow rect instead. If we
// use this rect, our relative bounds will match the bounds of what
// appears visually. We do this because some web authors (icloud.com for
// example) employ things like 0x0 buttons with visual overflow. Without
// this, such frames aren't navigable by screen readers.
result = frame->InkOverflowRectRelativeToSelf();
result.MoveBy(frame->GetOffsetTo(boundingFrame));
}
if (boundingFrame->GetRect().IsEmpty() ||
nsLayoutUtils::GetNextContinuationOrIBSplitSibling(boundingFrame)) {
// Constructing a bounding box across a frame that has an IB split means
// the origin is likely be different from that of boundingFrame.
// Descendants will need their parent-relative bounds adjusted
// accordingly, since parent-relative bounds are constructed to the
// bounding box of the entire element and not each individual IB split
// frame. In the case that boundingFrame's rect is empty,
// GetAllInFlowRectsUnion might exclude its origin. For example, if
// boundingFrame is empty with an origin of (0, -840) but has a non-empty
// ib-split-sibling with (0, 0), the union rect will originate at (0, 0).
// This means the bounds returned for our parent Accessible might be
// offset from boundingFrame's rect. Since result is currently relative to
// boundingFrame's rect, we might need to adjust it to make it parent
// relative.
nsRect boundingUnion =
nsLayoutUtils::GetAllInFlowRectsUnion(boundingFrame, boundingFrame);
if (!boundingUnion.IsEmpty()) {
// The origin of boundingUnion is relative to boundingFrame, meaning
// when we call MoveBy on result with this value we're offsetting
// `result` by the distance boundingFrame's origin was moved to
// construct its bounding box.
result.MoveBy(-boundingUnion.TopLeft());
} else {
// Since GetAllInFlowRectsUnion returned an empty rect on our parent
// Accessible, we would have used the ink overflow rect. However,
// GetAllInFlowRectsUnion calculates relative to the bounding frame's
// main rect, not its ink overflow rect. We need to adjust for the ink
// overflow offset to make our result parent relative.
nsRect boundingOverflow =
boundingFrame->InkOverflowRectRelativeToSelf();
result.MoveBy(-boundingOverflow.TopLeft());
}
}
if (frame->StyleDisplay()->mPosition == StylePositionProperty::Fixed &&
nsLayoutUtils::IsReallyFixedPos(frame)) {
// If we're dealing with a fixed position frame, we've already made it
// relative to the document which should have gotten rid of its scroll
// offset.
return result;
}
if (ScrollContainerFrame* sf =
mParent == mDoc
? mDoc->PresShellPtr()->GetRootScrollContainerFrame()
: boundingFrame->GetScrollTargetFrame()) {
// If boundingFrame has a scroll position, result is currently relative
// to that. Instead, we want result to remain the same regardless of
// scrolling. We then subtract the scroll position later when
// calculating absolute bounds. We do this because we don't want to push
// cache updates for the bounds of all descendants every time we scroll.
nsPoint scrollPos = sf->GetScrollPosition().ApplyResolution(
mDoc->PresShellPtr()->GetResolution());
result.MoveBy(scrollPos.x, scrollPos.y);
}
return result;
}
return nsRect();
}
nsRect LocalAccessible::RelativeBounds(nsIFrame** aBoundingFrame) const {
nsIFrame* frame = GetFrame();
if (frame && mContent) {
*aBoundingFrame = nsLayoutUtils::GetContainingBlockForClientRect(frame);
nsRect unionRect = nsLayoutUtils::GetAllInFlowRectsUnion(
frame, *aBoundingFrame,
nsLayoutUtils::GetAllInFlowRectsFlag::AccountForTransforms);
if (unionRect.IsEmpty()) {
// If we end up with a 0x0 rect from above (or one with negative
// height/width) we should try using the ink overflow rect instead. If we
// use this rect, our relative bounds will match the bounds of what
// appears visually. We do this because some web authors (icloud.com for
// example) employ things like 0x0 buttons with visual overflow. Without
// this, such frames aren't navigable by screen readers.
nsRect overflow = frame->InkOverflowRectRelativeToSelf();
nsLayoutUtils::TransformRect(frame, *aBoundingFrame, overflow);
return overflow;
}
return unionRect;
}
return nsRect();
}
nsRect LocalAccessible::BoundsInAppUnits() const {
nsIFrame* boundingFrame = nullptr;
nsRect unionRectTwips = RelativeBounds(&boundingFrame);
if (!boundingFrame) {
return nsRect();
}
PresShell* presShell = mDoc->PresContext()->PresShell();
// We need to inverse translate with the offset of the edge of the visual
// viewport from top edge of the layout viewport.
nsPoint viewportOffset = presShell->GetVisualViewportOffset() -
presShell->GetLayoutViewportOffset();
unionRectTwips.MoveBy(-viewportOffset);
// We need to take into account a non-1 resolution set on the presshell.
// This happens with async pinch zooming. Here we scale the bounds before
// adding the screen-relative offset.
unionRectTwips.ScaleRoundOut(presShell->GetResolution());
// We have the union of the rectangle, now we need to put it in absolute
// screen coords.
nsRect orgRectPixels = boundingFrame->GetScreenRectInAppUnits();
unionRectTwips.MoveBy(orgRectPixels.X(), orgRectPixels.Y());
return unionRectTwips;
}
LayoutDeviceIntRect LocalAccessible::Bounds() const {
return LayoutDeviceIntRect::FromAppUnitsToNearest(
BoundsInAppUnits(), mDoc->PresContext()->AppUnitsPerDevPixel());
}
void LocalAccessible::SetSelected(bool aSelect) {
if (!HasOwnContent()) return;
if (nsAccUtils::GetSelectableContainer(this, State()) && aSelect) {
TakeFocus();
}
}
void LocalAccessible::TakeSelection() {
LocalAccessible* select = nsAccUtils::GetSelectableContainer(this, State());
if (select) {
if (select->State() & states::MULTISELECTABLE) select->UnselectAll();
SetSelected(true);
}
}
void LocalAccessible::TakeFocus() const {
nsIFrame* frame = GetFrame();
if (!frame) return;
nsIContent* focusContent = mContent;
// If the accessible focus is managed by container widget then focus the
// widget and set the accessible as its current item.
if (!frame->IsFocusable()) {
LocalAccessible* widget = ContainerWidget();
if (widget && widget->AreItemsOperable()) {
nsIContent* widgetElm = widget->GetContent();
nsIFrame* widgetFrame = widgetElm->GetPrimaryFrame();
if (widgetFrame && widgetFrame->IsFocusable()) {
focusContent = widgetElm;
widget->SetCurrentItem(this);
}
}
}
if (RefPtr<nsFocusManager> fm = nsFocusManager::GetFocusManager()) {
dom::AutoHandlingUserInputStatePusher inputStatePusher(true);
// XXXbz: Can we actually have a non-element content here?
RefPtr<dom::Element> element = dom::Element::FromNodeOrNull(focusContent);
fm->SetFocus(element, 0);
}
}
void LocalAccessible::NameFromAssociatedXULLabel(DocAccessible* aDocument,
nsIContent* aElm,
nsString& aName) {
LocalAccessible* label = nullptr;
XULLabelIterator iter(aDocument, aElm);
while ((label = iter.Next())) {
// Check if label's value attribute is used
label->Elm()->GetAttr(nsGkAtoms::value, aName);
if (aName.IsEmpty()) {
// If no value attribute, a non-empty label must contain
// children that define its text -- possibly using HTML
nsTextEquivUtils::AppendTextEquivFromContent(label, label->Elm(), &aName);
}
}
aName.CompressWhitespace();
}
void LocalAccessible::XULElmName(DocAccessible* aDocument, nsIContent* aElm,
nsString& aName) {
/**
* 3 main cases for XUL Controls to be labeled
* 1 - control contains label="foo"
* 2 - non-child label contains control="controlID"
* - label has either value="foo" or children
* 3 - name from subtree; e.g. a child label element
* Cases 1 and 2 are handled here.
* Case 3 is handled by GetNameFromSubtree called in NativeName.
* Once a label is found, the search is discontinued, so a control
* that has a label attribute as well as having a label external to
* the control that uses the control="controlID" syntax will use
* the label attribute for its Name.
*/
// CASE #1 (via label attribute) -- great majority of the cases
// Only do this if this is not a select control element, which uses label
// attribute to indicate, which option is selected.
nsCOMPtr<nsIDOMXULSelectControlElement> select =
aElm->AsElement()->AsXULSelectControl();
if (!select) {
aElm->AsElement()->GetAttr(nsGkAtoms::label, aName);
}
// CASE #2 -- label as <label control="id" ... ></label>
if (aName.IsEmpty()) {
NameFromAssociatedXULLabel(aDocument, aElm, aName);
}
aName.CompressWhitespace();
}
nsresult LocalAccessible::HandleAccEvent(AccEvent* aEvent) {
NS_ENSURE_ARG_POINTER(aEvent);
if (profiler_thread_is_being_profiled_for_markers()) {
nsAutoCString strEventType;
GetAccService()->GetStringEventType(aEvent->GetEventType(), strEventType);
nsAutoCString strMarker;
strMarker.AppendLiteral("A11y Event - ");
strMarker.Append(strEventType);
PROFILER_MARKER_UNTYPED(strMarker, A11Y);
}
if (IPCAccessibilityActive() && Document()) {
DocAccessibleChild* ipcDoc = mDoc->IPCDoc();
// If ipcDoc is null, we can't fire the event to the client. We shouldn't
// have fired the event in the first place, since this makes events
// inconsistent for local and remote documents. To avoid this, don't call
// nsEventShell::FireEvent on a DocAccessible for which
// HasLoadState(eTreeConstructed) is false.
MOZ_ASSERT(ipcDoc);
if (ipcDoc) {
uint64_t id = aEvent->GetAccessible()->ID();
switch (aEvent->GetEventType()) {
case nsIAccessibleEvent::EVENT_SHOW:
ipcDoc->ShowEvent(downcast_accEvent(aEvent));
break;
case nsIAccessibleEvent::EVENT_HIDE:
ipcDoc->SendHideEvent(id, aEvent->IsFromUserInput());
break;
case nsIAccessibleEvent::EVENT_INNER_REORDER:
case nsIAccessibleEvent::EVENT_REORDER:
if (IsTable()) {
SendCache(CacheDomain::Table, CacheUpdateType::Update);
}
#if defined(XP_WIN)
if (HasOwnContent() && mContent->IsMathMLElement()) {
// For any change in a MathML subtree, update the innerHTML cache on
// the root math element.
for (LocalAccessible* acc = this; acc; acc = acc->LocalParent()) {
if (acc->HasOwnContent() &&
acc->mContent->IsMathMLElement(nsGkAtoms::math)) {
mDoc->QueueCacheUpdate(acc, CacheDomain::InnerHTML);
}
}
}
#endif // defined(XP_WIN)
// reorder events on the application acc aren't necessary to tell the
// parent about new top level documents.
if (!aEvent->GetAccessible()->IsApplication()) {
ipcDoc->SendEvent(id, aEvent->GetEventType());
}
break;
case nsIAccessibleEvent::EVENT_STATE_CHANGE: {
AccStateChangeEvent* event = downcast_accEvent(aEvent);
ipcDoc->SendStateChangeEvent(id, event->GetState(),
event->IsStateEnabled());
break;
}
case nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED: {
AccCaretMoveEvent* event = downcast_accEvent(aEvent);
ipcDoc->SendCaretMoveEvent(
id, event->GetCaretOffset(), event->IsSelectionCollapsed(),
event->IsAtEndOfLine(), event->GetGranularity(),
event->IsFromUserInput());
break;
}
case nsIAccessibleEvent::EVENT_TEXT_INSERTED:
case nsIAccessibleEvent::EVENT_TEXT_REMOVED: {
AccTextChangeEvent* event = downcast_accEvent(aEvent);
const nsString& text = event->ModifiedText();
ipcDoc->SendTextChangeEvent(
id, text, event->GetStartOffset(), event->GetLength(),
event->IsTextInserted(), event->IsFromUserInput());
break;
}
case nsIAccessibleEvent::EVENT_SELECTION:
case nsIAccessibleEvent::EVENT_SELECTION_ADD:
case nsIAccessibleEvent::EVENT_SELECTION_REMOVE: {
AccSelChangeEvent* selEvent = downcast_accEvent(aEvent);
ipcDoc->SendSelectionEvent(id, selEvent->Widget()->ID(),
aEvent->GetEventType());
break;
}
case nsIAccessibleEvent::EVENT_FOCUS:
ipcDoc->SendFocusEvent(id);
break;
case nsIAccessibleEvent::EVENT_SCROLLING_END:
case nsIAccessibleEvent::EVENT_SCROLLING: {
AccScrollingEvent* scrollingEvent = downcast_accEvent(aEvent);
ipcDoc->SendScrollingEvent(
id, aEvent->GetEventType(), scrollingEvent->ScrollX(),
scrollingEvent->ScrollY(), scrollingEvent->MaxScrollX(),
scrollingEvent->MaxScrollY());
break;
}
#if !defined(XP_WIN)
case nsIAccessibleEvent::EVENT_ANNOUNCEMENT: {
AccAnnouncementEvent* announcementEvent = downcast_accEvent(aEvent);
ipcDoc->SendAnnouncementEvent(id, announcementEvent->Announcement(),
announcementEvent->Priority());
break;
}
#endif // !defined(XP_WIN)
case nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED: {
AccTextSelChangeEvent* textSelChangeEvent = downcast_accEvent(aEvent);
AutoTArray<TextRange, 1> ranges;
textSelChangeEvent->SelectionRanges(&ranges);
nsTArray<TextRangeData> textRangeData(ranges.Length());
for (size_t i = 0; i < ranges.Length(); i++) {
const TextRange& range = ranges.ElementAt(i);
LocalAccessible* start = range.StartContainer()->AsLocal();
LocalAccessible* end = range.EndContainer()->AsLocal();
textRangeData.AppendElement(TextRangeData(start->ID(), end->ID(),
range.StartOffset(),
range.EndOffset()));
}
ipcDoc->SendTextSelectionChangeEvent(id, textRangeData);
break;
}
case nsIAccessibleEvent::EVENT_DESCRIPTION_CHANGE:
case nsIAccessibleEvent::EVENT_NAME_CHANGE: {
SendCache(CacheDomain::NameAndDescription, CacheUpdateType::Update);
ipcDoc->SendEvent(id, aEvent->GetEventType());
break;
}
case nsIAccessibleEvent::EVENT_TEXT_VALUE_CHANGE:
case nsIAccessibleEvent::EVENT_VALUE_CHANGE: {
SendCache(CacheDomain::Value, CacheUpdateType::Update);
ipcDoc->SendEvent(id, aEvent->GetEventType());
break;
}
default:
ipcDoc->SendEvent(id, aEvent->GetEventType());
}
}
}
if (nsCoreUtils::AccEventObserversExist()) {
nsCoreUtils::DispatchAccEvent(MakeXPCEvent(aEvent));
}
if (IPCAccessibilityActive()) {
return NS_OK;
}
if (IsDefunct()) {
// This could happen if there is an XPCOM observer, since script might run
// which mutates the tree.
return NS_OK;
}
LocalAccessible* target = aEvent->GetAccessible();
switch (aEvent->GetEventType()) {
case nsIAccessibleEvent::EVENT_SHOW:
PlatformShowHideEvent(target, target->LocalParent(), true,
aEvent->IsFromUserInput());
break;
case nsIAccessibleEvent::EVENT_HIDE:
PlatformShowHideEvent(target, target->LocalParent(), false,
aEvent->IsFromUserInput());
break;
case nsIAccessibleEvent::EVENT_STATE_CHANGE: {
AccStateChangeEvent* event = downcast_accEvent(aEvent);
PlatformStateChangeEvent(target, event->GetState(),
event->IsStateEnabled());
break;
}
case nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED: {
AccCaretMoveEvent* event = downcast_accEvent(aEvent);
LayoutDeviceIntRect rect;
// The caret rect is only used on Windows, so just pass an empty rect on
// other platforms.
// XXX We pass an empty rect on Windows as well because
// AccessibleWrap::UpdateSystemCaretFor currently needs to call
// HyperTextAccessible::GetCaretRect again to get the widget and there's
// no point calling it twice.
PlatformCaretMoveEvent(
target, event->GetCaretOffset(), event->IsSelectionCollapsed(),
event->GetGranularity(), rect, event->IsFromUserInput());
break;
}
case nsIAccessibleEvent::EVENT_TEXT_INSERTED:
case nsIAccessibleEvent::EVENT_TEXT_REMOVED: {
AccTextChangeEvent* event = downcast_accEvent(aEvent);
const nsString& text = event->ModifiedText();
PlatformTextChangeEvent(target, text, event->GetStartOffset(),
event->GetLength(), event->IsTextInserted(),
event->IsFromUserInput());
break;
}
case nsIAccessibleEvent::EVENT_SELECTION:
case nsIAccessibleEvent::EVENT_SELECTION_ADD:
case nsIAccessibleEvent::EVENT_SELECTION_REMOVE: {
AccSelChangeEvent* selEvent = downcast_accEvent(aEvent);
PlatformSelectionEvent(target, selEvent->Widget(),
aEvent->GetEventType());
break;
}
case nsIAccessibleEvent::EVENT_FOCUS: {
LayoutDeviceIntRect rect;
// The caret rect is only used on Windows, so just pass an empty rect on
// other platforms.
#ifdef XP_WIN
if (HyperTextAccessible* text = target->AsHyperText()) {
nsIWidget* widget = nullptr;
rect = text->GetCaretRect(&widget);
}
#endif
PlatformFocusEvent(target, rect);
break;
}
#if defined(ANDROID)
case nsIAccessibleEvent::EVENT_SCROLLING_END:
case nsIAccessibleEvent::EVENT_SCROLLING: {
AccScrollingEvent* scrollingEvent = downcast_accEvent(aEvent);
PlatformScrollingEvent(
target, aEvent->GetEventType(), scrollingEvent->ScrollX(),
scrollingEvent->ScrollY(), scrollingEvent->MaxScrollX(),
scrollingEvent->MaxScrollY());
break;
}
case nsIAccessibleEvent::EVENT_ANNOUNCEMENT: {
AccAnnouncementEvent* announcementEvent = downcast_accEvent(aEvent);
PlatformAnnouncementEvent(target, announcementEvent->Announcement(),
announcementEvent->Priority());
break;
}
#endif // defined(ANDROID)
#if defined(MOZ_WIDGET_COCOA)
case nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED: {
AccTextSelChangeEvent* textSelChangeEvent = downcast_accEvent(aEvent);
AutoTArray<TextRange, 1> ranges;
textSelChangeEvent->SelectionRanges(&ranges);
PlatformTextSelectionChangeEvent(target, ranges);
break;
}
#endif // defined(MOZ_WIDGET_COCOA)
default:
PlatformEvent(target, aEvent->GetEventType());
}
return NS_OK;
}
already_AddRefed<AccAttributes> LocalAccessible::Attributes() {
RefPtr<AccAttributes> attributes = NativeAttributes();
if (!HasOwnContent() || !mContent->IsElement()) return attributes.forget();
// 'xml-roles' attribute coming from ARIA.
nsString xmlRoles;
if (nsAccUtils::GetARIAAttr(mContent->AsElement(), nsGkAtoms::role,
xmlRoles) &&
!xmlRoles.IsEmpty()) {
attributes->SetAttribute(nsGkAtoms::xmlroles, std::move(xmlRoles));
} else if (nsAtom* landmark = LandmarkRole()) {
// 'xml-roles' attribute for landmark.
attributes->SetAttribute(nsGkAtoms::xmlroles, landmark);
}
// Expose object attributes from ARIA attributes.
aria::AttrIterator attribIter(mContent);
while (attribIter.Next()) {
if (attribIter.AttrName() == nsGkAtoms::aria_placeholder &&
attributes->HasAttribute(nsGkAtoms::placeholder)) {
// If there is an HTML placeholder attribute exposed by
// HTMLTextFieldAccessible::NativeAttributes, don't expose
// aria-placeholder.
continue;
}
attribIter.ExposeAttr(attributes);
}
// If there is no aria-live attribute then expose default value of 'live'
// object attribute used for ARIA role of this accessible.
const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
if (roleMapEntry) {
if (roleMapEntry->Is(nsGkAtoms::searchbox)) {
attributes->SetAttribute(nsGkAtoms::textInputType, nsGkAtoms::search);
}
if (!attributes->HasAttribute(nsGkAtoms::aria_live)) {
nsString live;
if (nsAccUtils::GetLiveAttrValue(roleMapEntry->liveAttRule, live)) {
attributes->SetAttribute(nsGkAtoms::aria_live, std::move(live));
}
}
}
return attributes.forget();
}
already_AddRefed<AccAttributes> LocalAccessible::NativeAttributes() {
RefPtr<AccAttributes> attributes = new AccAttributes();
// We support values, so expose the string value as well, via the valuetext
// object attribute. We test for the value interface because we don't want
// to expose traditional Value() information such as URL's on links and
// documents, or text in an input.
if (HasNumericValue()) {
nsString valuetext;
Value(valuetext);
attributes->SetAttribute(nsGkAtoms::aria_valuetext, std::move(valuetext));
}
// Expose checkable object attribute if the accessible has checkable state
if (State() & states::CHECKABLE) {
attributes->SetAttribute(nsGkAtoms::checkable, true);
}
// Expose 'explicit-name' attribute.
nsAutoString name;
if (Name(name) != eNameFromSubtree && !name.IsVoid()) {
attributes->SetAttribute(nsGkAtoms::explicit_name, true);
}
// Group attributes (level/setsize/posinset)
GroupPos groupPos = GroupPosition();
nsAccUtils::SetAccGroupAttrs(attributes, groupPos.level, groupPos.setSize,
groupPos.posInSet);
bool hierarchical = false;
uint32_t itemCount = AccGroupInfo::TotalItemCount(this, &hierarchical);
if (itemCount) {
attributes->SetAttribute(nsGkAtoms::child_item_count,
static_cast<int32_t>(itemCount));
}
if (hierarchical) {
attributes->SetAttribute(nsGkAtoms::tree, true);
}
// If the accessible doesn't have own content (such as list item bullet or
// xul tree item) then don't calculate content based attributes.
if (!HasOwnContent()) return attributes.forget();
// Get container-foo computed live region properties based on the closest
// container with the live region attribute. Inner nodes override outer nodes
// within the same document. The inner nodes can be used to override live
// region behavior on more general outer nodes.
nsAccUtils::SetLiveContainerAttributes(attributes, this);
if (!mContent->IsElement()) return attributes.forget();
nsString id;
if (nsCoreUtils::GetID(mContent, id)) {
attributes->SetAttribute(nsGkAtoms::id, std::move(id));
}
// Expose class because it may have useful microformat information.
nsString _class;
if (mContent->AsElement()->GetAttr(nsGkAtoms::_class, _class)) {
attributes->SetAttribute(nsGkAtoms::_class, std::move(_class));
}
// Expose tag.
attributes->SetAttribute(nsGkAtoms::tag, mContent->NodeInfo()->NameAtom());
if (auto htmlElement = nsGenericHTMLElement::FromNode(mContent)) {
// Expose draggable object attribute.
if (htmlElement->Draggable()) {
attributes->SetAttribute(nsGkAtoms::draggable, true);
}
nsString popover;
htmlElement->GetPopover(popover);
if (!popover.IsEmpty()) {
attributes->SetAttribute(nsGkAtoms::ispopup, std::move(popover));
}
}
// Don't calculate CSS-based object attributes when:
// 1. There is no frame (e.g. the accessible is unattached from the tree).
// 2. This is an image map area. CSS is irrelevant here. Furthermore, we won't
// be able to get the computed style if the map is unslotted in a shadow host.
nsIFrame* f = mContent->GetPrimaryFrame();
if (!f || mContent->IsHTMLElement(nsGkAtoms::area)) {
return attributes.forget();
}
// Expose 'display' attribute.
if (RefPtr<nsAtom> display = DisplayStyle()) {
attributes->SetAttribute(nsGkAtoms::display, display);
}
const ComputedStyle& style = *f->Style();
auto Atomize = [&](nsCSSPropertyID aId) -> RefPtr<nsAtom> {
nsAutoCString value;
style.GetComputedPropertyValue(aId, value);
return NS_Atomize(value);
};
// Expose 'text-align' attribute.
attributes->SetAttribute(nsGkAtoms::textAlign,
Atomize(eCSSProperty_text_align));
// Expose 'text-indent' attribute.
attributes->SetAttribute(nsGkAtoms::textIndent,
Atomize(eCSSProperty_text_indent));
auto GetMargin = [&](mozilla::Side aSide) -> CSSCoord {
// This is here only to guarantee that we do the same as getComputedStyle
// does, so that we don't hit precision errors in tests.
const auto& margin = f->StyleMargin()->GetMargin(aSide);
if (margin.ConvertsToLength()) {
return margin.AsLengthPercentage().ToLengthInCSSPixels();
}
nscoord coordVal = f->GetUsedMargin().Side(aSide);
return CSSPixel::FromAppUnits(coordVal);
};
// Expose 'margin-left' attribute.
attributes->SetAttribute(nsGkAtoms::marginLeft, GetMargin(eSideLeft));
// Expose 'margin-right' attribute.
attributes->SetAttribute(nsGkAtoms::marginRight, GetMargin(eSideRight));
// Expose 'margin-top' attribute.
attributes->SetAttribute(nsGkAtoms::marginTop, GetMargin(eSideTop));
// Expose 'margin-bottom' attribute.
attributes->SetAttribute(nsGkAtoms::marginBottom, GetMargin(eSideBottom));
// Expose data-at-shortcutkeys attribute for web applications and virtual
// cursors. Currently mostly used by JAWS.
nsString atShortcutKeys;
if (mContent->AsElement()->GetAttr(
kNameSpaceID_None, nsGkAtoms::dataAtShortcutkeys, atShortcutKeys)) {
attributes->SetAttribute(nsGkAtoms::dataAtShortcutkeys,
std::move(atShortcutKeys));
}
return attributes.forget();
}
bool LocalAccessible::AttributeChangesState(nsAtom* aAttribute) {
return aAttribute == nsGkAtoms::aria_disabled ||
// The HTML element disabled state gets handled in
// DocAccessible::ElementStateChanged. This matches
// LocalAccessible::NativelyUnavailable.
(aAttribute == nsGkAtoms::disabled && !mContent->IsHTMLElement()) ||
aAttribute == nsGkAtoms::tabindex ||
aAttribute == nsGkAtoms::aria_required ||
aAttribute == nsGkAtoms::aria_invalid ||
aAttribute == nsGkAtoms::aria_expanded ||
aAttribute == nsGkAtoms::aria_checked ||
(aAttribute == nsGkAtoms::aria_pressed && IsButton()) ||
aAttribute == nsGkAtoms::aria_readonly ||
aAttribute == nsGkAtoms::aria_current ||
aAttribute == nsGkAtoms::aria_haspopup ||
aAttribute == nsGkAtoms::aria_busy ||
aAttribute == nsGkAtoms::aria_multiline ||
aAttribute == nsGkAtoms::aria_multiselectable ||
aAttribute == nsGkAtoms::contenteditable ||
aAttribute == nsGkAtoms::popovertarget;
}
void LocalAccessible::DOMAttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute, int32_t aModType,
const nsAttrValue* aOldValue,
uint64_t aOldState) {
// Fire accessible event after short timer, because we need to wait for
// DOM attribute & resulting layout to actually change. Otherwise,
// assistive technology will retrieve the wrong state/value/selection info.
CssAltContent::HandleAttributeChange(mContent, aNameSpaceID, aAttribute);
// XXX todo
// We still need to handle special HTML cases here
// For example, if an <img>'s usemap attribute is modified
// Otherwise it may just be a state change, for example an object changing
// its visibility
//
// XXX todo: report aria state changes for "undefined" literal value changes
//
// XXX todo: invalidate accessible when aria state changes affect exposed
if (AttributeChangesState(aAttribute)) {
uint64_t currState = State();
uint64_t diffState = currState ^ aOldState;
if (diffState) {
for (uint64_t state = 1; state <= states::LAST_ENTRY; state <<= 1) {
if (diffState & state) {
RefPtr<AccEvent> stateChangeEvent =
new AccStateChangeEvent(this, state, (currState & state));
mDoc->FireDelayedEvent(stateChangeEvent);
}
}
}
}
if (aAttribute == nsGkAtoms::_class) {
mDoc->QueueCacheUpdate(this, CacheDomain::DOMNodeIDAndClass);
return;
}
// When a details object has its open attribute changed
// we should fire a state-change event on the accessible of
// its main summary
if (aAttribute == nsGkAtoms::open) {
// FromDetails checks if the given accessible belongs to
// a details frame and also locates the accessible of its
// main summary.
if (HTMLSummaryAccessible* summaryAccessible =
HTMLSummaryAccessible::FromDetails(this)) {
RefPtr<AccEvent> expandedChangeEvent =
new AccStateChangeEvent(summaryAccessible, states::EXPANDED);
mDoc->FireDelayedEvent(expandedChangeEvent);
return;
}
}
// Check for namespaced ARIA attribute
if (aNameSpaceID == kNameSpaceID_None) {
// Check for hyphenated aria-foo property?
if (StringBeginsWith(nsDependentAtomString(aAttribute), u"aria-"_ns)) {
uint8_t attrFlags = aria::AttrCharacteristicsFor(aAttribute);
if (!(attrFlags & ATTR_BYPASSOBJ)) {
mDoc->QueueCacheUpdate(this, CacheDomain::ARIA);
// For aria attributes like drag and drop changes we fire a generic
// attribute change event; at least until native API comes up with a
// more meaningful event.
RefPtr<AccEvent> event =
new AccObjectAttrChangedEvent(this, aAttribute);
mDoc->FireDelayedEvent(event);
}
}
}
dom::Element* elm = Elm();
if (HasNumericValue() &&
(aAttribute == nsGkAtoms::aria_valuemax ||
aAttribute == nsGkAtoms::aria_valuemin || aAttribute == nsGkAtoms::min ||
aAttribute == nsGkAtoms::max || aAttribute == nsGkAtoms::step)) {
mDoc->QueueCacheUpdate(this, CacheDomain::Value);
return;
}
// Fire text value change event whenever aria-valuetext is changed.
if (aAttribute == nsGkAtoms::aria_valuetext) {
mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_TEXT_VALUE_CHANGE, this);
return;
}
if (aAttribute == nsGkAtoms::aria_valuenow) {
if (!nsAccUtils::HasARIAAttr(elm, nsGkAtoms::aria_valuetext) ||
nsAccUtils::ARIAAttrValueIs(elm, nsGkAtoms::aria_valuetext,
nsGkAtoms::_empty, eCaseMatters)) {
// Fire numeric value change event when aria-valuenow is changed and
// aria-valuetext is empty
mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_VALUE_CHANGE, this);
} else {
// We need to update the cache here since we won't get an event if
// aria-valuenow is shadowed by aria-valuetext.
mDoc->QueueCacheUpdate(this, CacheDomain::Value);
}
return;
}
if (aAttribute == nsGkAtoms::aria_owns) {
mDoc->Controller()->ScheduleRelocation(this);
}
// Fire name change and description change events.
if (aAttribute == nsGkAtoms::aria_label) {
// A valid aria-labelledby would take precedence so an aria-label change
// won't change the name.
AssociatedElementsIterator iter(mDoc, elm, nsGkAtoms::aria_labelledby);
if (!iter.NextElem()) {
mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, this);
}
return;
}
if (aAttribute == nsGkAtoms::aria_description) {
// A valid aria-describedby would take precedence so an aria-description
// change won't change the description.
AssociatedElementsIterator iter(mDoc, elm, nsGkAtoms::aria_describedby);
if (!iter.NextElem()) {
mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_DESCRIPTION_CHANGE,
this);
}
return;
}
if (aAttribute == nsGkAtoms::aria_describedby) {
mDoc->QueueCacheUpdate(this, CacheDomain::Relations);
mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_DESCRIPTION_CHANGE, this);
if (aModType == dom::MutationEvent_Binding::MODIFICATION ||
aModType == dom::MutationEvent_Binding::ADDITION) {
// The subtrees of the new aria-describedby targets might be used to
// compute the description for this. Therefore, we need to set
// the eHasDescriptionDependent flag on all Accessibles in these subtrees.
AssociatedElementsIterator iter(mDoc, elm, nsGkAtoms::aria_describedby);
while (LocalAccessible* target = iter.Next()) {
target->ModifySubtreeContextFlags(eHasDescriptionDependent, true);
}
}
return;
}
if (aAttribute == nsGkAtoms::aria_labelledby) {
// We only queue cache updates for explicit relations. Implicit, reverse
// relations are handled in ApplyCache and stored in a map on the remote
// document itself.
mDoc->QueueCacheUpdate(this, CacheDomain::Relations);
mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, this);
if (aModType == dom::MutationEvent_Binding::MODIFICATION ||
aModType == dom::MutationEvent_Binding::ADDITION) {
// The subtrees of the new aria-labelledby targets might be used to
// compute the name for this. Therefore, we need to set
// the eHasNameDependent flag on all Accessibles in these subtrees.
AssociatedElementsIterator iter(mDoc, elm, nsGkAtoms::aria_labelledby);
while (LocalAccessible* target = iter.Next()) {
target->ModifySubtreeContextFlags(eHasNameDependent, true);
}
}
return;
}
if ((aAttribute == nsGkAtoms::aria_expanded ||
aAttribute == nsGkAtoms::href) &&
(aModType == dom::MutationEvent_Binding::ADDITION ||
aModType == dom::MutationEvent_Binding::REMOVAL)) {
// The presence of aria-expanded adds an expand/collapse action.
mDoc->QueueCacheUpdate(this, CacheDomain::Actions);
}
if (aAttribute == nsGkAtoms::href || aAttribute == nsGkAtoms::src) {
mDoc->QueueCacheUpdate(this, CacheDomain::Value);
}
if (aAttribute == nsGkAtoms::aria_controls ||
aAttribute == nsGkAtoms::aria_flowto ||
aAttribute == nsGkAtoms::aria_details ||
aAttribute == nsGkAtoms::aria_errormessage) {
mDoc->QueueCacheUpdate(this, CacheDomain::Relations);
}
if (aAttribute == nsGkAtoms::popovertarget) {
mDoc->QueueCacheUpdate(this, CacheDomain::Relations);
return;
}
if (aAttribute == nsGkAtoms::alt &&
!nsAccUtils::HasARIAAttr(elm, nsGkAtoms::aria_label) &&
!elm->HasAttr(nsGkAtoms::aria_labelledby)) {
mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, this);
return;
}
if (aAttribute == nsGkAtoms::title) {
nsAutoString name;
ARIAName(name);
if (name.IsEmpty()) {
NativeName(name);
if (name.IsEmpty()) {
mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_NAME_CHANGE, this);
return;
}
}
if (!elm->HasAttr(nsGkAtoms::aria_describedby)) {
mDoc->FireDelayedEvent(nsIAccessibleEvent::EVENT_DESCRIPTION_CHANGE,
this);
}
return;
}
// ARIA or XUL selection
if ((mContent->IsXULElement() && aAttribute == nsGkAtoms::selected) ||
aAttribute == nsGkAtoms::aria_selected) {
LocalAccessible* widget = nsAccUtils::GetSelectableContainer(this, State());
if (widget) {
AccSelChangeEvent::SelChangeType selChangeType;
if (aNameSpaceID != kNameSpaceID_None) {
selChangeType = elm->AttrValueIs(aNameSpaceID, aAttribute,
nsGkAtoms::_true, eCaseMatters)
? AccSelChangeEvent::eSelectionAdd
: AccSelChangeEvent::eSelectionRemove;
} else {
selChangeType = nsAccUtils::ARIAAttrValueIs(
elm, aAttribute, nsGkAtoms::_true, eCaseMatters)
? AccSelChangeEvent::eSelectionAdd
: AccSelChangeEvent::eSelectionRemove;
}
RefPtr<AccEvent> event =
new AccSelChangeEvent(widget, this, selChangeType);
mDoc->FireDelayedEvent(event);
if (aAttribute == nsGkAtoms::aria_selected) {
mDoc->QueueCacheUpdate(this, CacheDomain::State);
}
}
return;
}
if (aAttribute == nsGkAtoms::aria_level ||
aAttribute == nsGkAtoms::aria_setsize ||
aAttribute == nsGkAtoms::aria_posinset) {
mDoc->QueueCacheUpdate(this, CacheDomain::GroupInfo);
return;
}
if (aAttribute == nsGkAtoms::accesskey) {
mDoc->QueueCacheUpdate(this, CacheDomain::Actions);
}
if (aAttribute == nsGkAtoms::name &&
(mContent && mContent->IsHTMLElement(nsGkAtoms::a))) {
// If an anchor's name changed, it's possible a LINKS_TO relation
// also changed. Push a cache update for Relations.
mDoc->QueueCacheUpdate(this, CacheDomain::Relations);
}
}
void LocalAccessible::ARIAGroupPosition(int32_t* aLevel, int32_t* aSetSize,
int32_t* aPosInSet) const {
if (!mContent) {
return;
}
if (aLevel) {
nsCoreUtils::GetUIntAttr(mContent, nsGkAtoms::aria_level, aLevel);
}
if (aSetSize) {
nsCoreUtils::GetUIntAttr(mContent, nsGkAtoms::aria_setsize, aSetSize);
}
if (aPosInSet) {
nsCoreUtils::GetUIntAttr(mContent, nsGkAtoms::aria_posinset, aPosInSet);
}
}
uint64_t LocalAccessible::State() {
if (IsDefunct()) return states::DEFUNCT;
uint64_t state = NativeState();
// Apply ARIA states to be sure accessible states will be overridden.
ApplyARIAState(&state);
const uint32_t kExpandCollapseStates = states::COLLAPSED | states::EXPANDED;
if ((state & kExpandCollapseStates) == kExpandCollapseStates) {
// Cannot be both expanded and collapsed -- this happens in ARIA expanded
// combobox because of limitation of ARIAMap.
// XXX: Perhaps we will be able to make this less hacky if we support
// extended states in ARIAMap, e.g. derive COLLAPSED from
// EXPANDABLE && !EXPANDED.
state &= ~states::COLLAPSED;
}
if (!(state & states::UNAVAILABLE)) {
state |= states::ENABLED | states::SENSITIVE;
// If the object is a current item of container widget then mark it as
// ACTIVE. This allows screen reader virtual buffer modes to know which
// descendant is the current one that would get focus if the user navigates
// to the container widget.
LocalAccessible* widget = ContainerWidget();
if (widget && widget->CurrentItem() == this) state |= states::ACTIVE;
}
if ((state & states::COLLAPSED) || (state & states::EXPANDED)) {
state |= states::EXPANDABLE;
}
ApplyImplicitState(state);
return state;
}
void LocalAccessible::ApplyARIAState(uint64_t* aState) const {
if (!mContent->IsElement()) return;
dom::Element* element = mContent->AsElement();
// Test for universal states first
*aState |= aria::UniversalStatesFor(element);
const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
if (!roleMapEntry && IsHTMLTableCell() && Role() == roles::GRID_CELL) {
// This is a <td> inside a role="grid", so it gets an implicit role of
// GRID_CELL in ARIATransformRole. However, because it's implicit, we
// don't have a role map entry, and without that, we can't apply ARIA states
// below. Therefore, we get the role map entry here.
roleMapEntry = aria::GetRoleMap(nsGkAtoms::gridcell);
MOZ_ASSERT(roleMapEntry, "Should have role map entry for gridcell");
}
if (roleMapEntry) {
// We only force the readonly bit off if we have a real mapping for the aria
// role. This preserves the ability for screen readers to use readonly
// (primarily on the document) as the hint for creating a virtual buffer.
if (roleMapEntry->role != roles::NOTHING) *aState &= ~states::READONLY;
if (mContent->HasID()) {
// If has a role & ID and aria-activedescendant on the container, assume
// focusable.
const LocalAccessible* ancestor = this;
while ((ancestor = ancestor->LocalParent()) && !ancestor->IsDoc()) {
dom::Element* el = ancestor->Elm();
if (el && el->HasAttr(nsGkAtoms::aria_activedescendant)) {
*aState |= states::FOCUSABLE;
break;
}
}
}
}
if (*aState & states::FOCUSABLE) {
// Propogate aria-disabled from ancestors down to any focusable descendant.
const LocalAccessible* ancestor = this;
while ((ancestor = ancestor->LocalParent()) && !ancestor->IsDoc()) {
dom::Element* el = ancestor->Elm();
if (el && nsAccUtils::ARIAAttrValueIs(el, nsGkAtoms::aria_disabled,
nsGkAtoms::_true, eCaseMatters)) {
*aState |= states::UNAVAILABLE;
break;
}
}
} else {
// Sometimes, we use aria-activedescendant targeting something which isn't
// actually a descendant. This is technically a spec violation, but it's a
// useful hack which makes certain things much easier. For example, we use
// this for "fake focus" for multi select browser tabs and Quantumbar
// autocomplete suggestions.
// In these cases, the aria-activedescendant code above won't make the
// active item focusable. It doesn't make sense for something to have
// focus when it isn't focusable, so fix that here.
if (FocusMgr()->IsActiveItem(this)) {
*aState |= states::FOCUSABLE;
}
}
// special case: A native button element whose role got transformed by ARIA to
// a toggle button Also applies to togglable button menus, like in the Dev
// Tools Web Console.
if (IsButton() || IsMenuButton()) {
aria::MapToState(aria::eARIAPressed, element, aState);
}
if (!roleMapEntry) return;
*aState |= roleMapEntry->state;
if (aria::MapToState(roleMapEntry->attributeMap1, element, aState) &&
aria::MapToState(roleMapEntry->attributeMap2, element, aState) &&
aria::MapToState(roleMapEntry->attributeMap3, element, aState)) {
aria::MapToState(roleMapEntry->attributeMap4, element, aState);
}
// ARIA gridcell inherits readonly state from the grid until it's overridden.
if ((roleMapEntry->Is(nsGkAtoms::gridcell) ||
roleMapEntry->Is(nsGkAtoms::columnheader) ||
roleMapEntry->Is(nsGkAtoms::rowheader)) &&
// Don't recurse infinitely for an authoring error like
// <table role="gridcell">. Without this check, we'd call TableFor(this)
// below, which would return this.
!IsTable() &&
!nsAccUtils::HasDefinedARIAToken(mContent, nsGkAtoms::aria_readonly)) {
if (const LocalAccessible* grid = nsAccUtils::TableFor(this)) {
uint64_t gridState = 0;
grid->ApplyARIAState(&gridState);
*aState |= gridState & states::READONLY;
}
}
}
void LocalAccessible::Value(nsString& aValue) const {
if (HasNumericValue()) {
// aria-valuenow is a number, and aria-valuetext is the optional text
// equivalent. For the string value, we will try the optional text
// equivalent first.
if (!mContent->IsElement()) {
return;
}
if (!nsAccUtils::GetARIAAttr(mContent->AsElement(),
nsGkAtoms::aria_valuetext, aValue)) {
if (!NativeHasNumericValue()) {
double checkValue = CurValue();
if (!std::isnan(checkValue)) {
aValue.AppendFloat(checkValue);
}
}
}
return;
}
const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
if (!roleMapEntry) {
return;
}
// Value of textbox is a textified subtree.
if (roleMapEntry->Is(nsGkAtoms::textbox)) {
nsTextEquivUtils::GetTextEquivFromSubtree(this, aValue);
return;
}
// Value of combobox is a text of current or selected item.
if (roleMapEntry->Is(nsGkAtoms::combobox)) {
LocalAccessible* option = CurrentItem();
if (!option) {
uint32_t childCount = ChildCount();
for (uint32_t idx = 0; idx < childCount; idx++) {
LocalAccessible* child = mChildren.ElementAt(idx);
if (child->IsListControl()) {
Accessible* acc = child->GetSelectedItem(0);
option = acc ? acc->AsLocal() : nullptr;
break;
}
}
}
// If there's a selected item, get the value from it. Otherwise, determine
// the value from descendant elements.
nsTextEquivUtils::GetTextEquivFromSubtree(option ? option : this, aValue);
}
}
double LocalAccessible::MaxValue() const {
double checkValue = AttrNumericValue(nsGkAtoms::aria_valuemax);
if (std::isnan(checkValue) && !NativeHasNumericValue()) {
// aria-valuemax isn't present and this element doesn't natively provide a
// maximum value. Use the ARIA default.
const nsRoleMapEntry* roleMap = ARIARoleMap();
if (roleMap && roleMap->role == roles::SPINBUTTON) {
return UnspecifiedNaN<double>();
}
return 100;
}
return checkValue;
}
double LocalAccessible::MinValue() const {
double checkValue = AttrNumericValue(nsGkAtoms::aria_valuemin);
if (std::isnan(checkValue) && !NativeHasNumericValue()) {
// aria-valuemin isn't present and this element doesn't natively provide a
// minimum value. Use the ARIA default.
const nsRoleMapEntry* roleMap = ARIARoleMap();
if (roleMap && roleMap->role == roles::SPINBUTTON) {
return UnspecifiedNaN<double>();
}
return 0;
}
return checkValue;
}
double LocalAccessible::Step() const {
return UnspecifiedNaN<double>(); // no mimimum increment (step) in ARIA.
}
double LocalAccessible::CurValue() const {
double checkValue = AttrNumericValue(nsGkAtoms::aria_valuenow);
if (std::isnan(checkValue) && !NativeHasNumericValue()) {
// aria-valuenow isn't present and this element doesn't natively provide a
// current value. Use the ARIA default.
const nsRoleMapEntry* roleMap = ARIARoleMap();
if (roleMap && roleMap->role == roles::SPINBUTTON) {
return UnspecifiedNaN<double>();
}
double minValue = MinValue();
return minValue + ((MaxValue() - minValue) / 2);
}
return checkValue;
}
bool LocalAccessible::SetCurValue(double aValue) { return false; }
role LocalAccessible::FindNextValidARIARole(
std::initializer_list<nsStaticAtom*> aRolesToSkip) const {
const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
if (roleMapEntry && mContent && mContent->IsElement()) {
dom::Element* elem = mContent->AsElement();
if (!nsAccUtils::ARIAAttrValueIs(elem, nsGkAtoms::role,
roleMapEntry->roleAtom, eIgnoreCase)) {
// Get the next valid token that isn't in the list of roles to skip.
uint8_t roleMapIndex =
aria::GetFirstValidRoleMapIndexExcluding(elem, aRolesToSkip);
// If we don't find a valid token, fall back to the native role.
if (roleMapIndex == aria::NO_ROLE_MAP_ENTRY_INDEX ||
roleMapIndex == aria::LANDMARK_ROLE_MAP_ENTRY_INDEX) {
return NativeRole();
}
const nsRoleMapEntry* fallbackRoleMapEntry =
aria::GetRoleMapFromIndex(roleMapIndex);
if (!fallbackRoleMapEntry) {
return NativeRole();
}
// Return the next valid role, but validate that first, too.
return ARIATransformRole(fallbackRoleMapEntry->role);
}
}
// Fall back to the native role.
return NativeRole();
}
role LocalAccessible::ARIATransformRole(role aRole) const {
// Beginning with ARIA 1.1, user agents are expected to use the native host
// language role of the element when the form or region roles are used without
// a name. Says the spec, "the user agent MUST treat such elements as if no
// role had been provided."
//
// XXX: While the name computation algorithm can be non-trivial in the general
// case, it should not be especially bad here: If the author hasn't used the
// region role, this calculation won't occur. And the region role's name
// calculation rule excludes name from content. That said, this use case is
// another example of why we should consider caching the accessible name. See:
if (aRole == roles::REGION || aRole == roles::FORM) {
if (NameIsEmpty()) {
// If we have a "form" or "region" role, but no accessible name, we need
// to search for the next valid role. First, we search through the role
// attribute value string - there might be a valid fallback there. Skip
// all "form" or "region" attributes; we know they're not valid since
// there's no accessible name. If we find a valid role that's not "form"
// or "region", fall back to it (but run it through ARIATransformRole
// first). Otherwise, fall back to the element's native role.
return FindNextValidARIARole({nsGkAtoms::region, nsGkAtoms::form});
}
return aRole;
}
// XXX: these unfortunate exceptions don't fit into the ARIA table. This is
// where the accessible role depends on both the role and ARIA state.
if (aRole == roles::PUSHBUTTON) {
if (nsAccUtils::HasDefinedARIAToken(mContent, nsGkAtoms::aria_pressed)) {
// For simplicity, any existing pressed attribute except "" or "undefined"
// indicates a toggle.
return roles::TOGGLE_BUTTON;
}
if (mContent->IsElement() &&
nsAccUtils::ARIAAttrValueIs(mContent->AsElement(),
nsGkAtoms::aria_haspopup, nsGkAtoms::_true,
eCaseMatters)) {
// For button with aria-haspopup="true".
return roles::BUTTONMENU;
}
} else if (aRole == roles::LISTBOX) {
// A listbox inside of a combobox needs a special role because of ATK
// mapping to menu.
if (mParent && mParent->IsCombobox()) {
return roles::COMBOBOX_LIST;
}
} else if (aRole == roles::OPTION) {
if (mParent && mParent->Role() == roles::COMBOBOX_LIST) {
return roles::COMBOBOX_OPTION;
}
// Orphaned option outside the context of a listbox.
const Accessible* listbox = FindAncestorIf([](const Accessible& aAcc) {
const role accRole = aAcc.Role();
return accRole == roles::LISTBOX ? AncestorSearchOption::Found
: accRole == roles::GROUPING ? AncestorSearchOption::Continue
: AncestorSearchOption::NotFound;
});
if (!listbox) {
return NativeRole();
}
} else if (aRole == roles::MENUITEM) {
// Menuitem has a submenu.
if (mContent->IsElement() &&
nsAccUtils::ARIAAttrValueIs(mContent->AsElement(),
nsGkAtoms::aria_haspopup, nsGkAtoms::_true,
eCaseMatters)) {
return roles::PARENT_MENUITEM;
}
// Orphaned menuitem outside the context of a menu/menubar.
const Accessible* menu = FindAncestorIf([](const Accessible& aAcc) {
const role accRole = aAcc.Role();
return (accRole == roles::MENUBAR || accRole == roles::MENUPOPUP)
? AncestorSearchOption::Found
: accRole == roles::GROUPING ? AncestorSearchOption::Continue
: AncestorSearchOption::NotFound;
});
if (!menu) {
return NativeRole();
}
} else if (aRole == roles::RADIO_MENU_ITEM ||
aRole == roles::CHECK_MENU_ITEM) {
// Orphaned radio/checkbox menuitem outside the context of a menu/menubar.
const Accessible* menu = FindAncestorIf([](const Accessible& aAcc) {
const role accRole = aAcc.Role();
return (accRole == roles::MENUBAR || accRole == roles::MENUPOPUP)
? AncestorSearchOption::Found
: accRole == roles::GROUPING ? AncestorSearchOption::Continue
: AncestorSearchOption::NotFound;
});
if (!menu) {
return NativeRole();
}
} else if (aRole == roles::CELL) {
// A cell inside an ancestor table element that has a grid role needs a
// gridcell role
const LocalAccessible* table = nsAccUtils::TableFor(this);
if (table && table->IsARIARole(nsGkAtoms::grid)) {
return roles::GRID_CELL;
}
} else if (aRole == roles::ROW) {
// Orphaned rows outside the context of a table.
const LocalAccessible* table = nsAccUtils::TableFor(this);
if (!table) {
return NativeRole();
}
} else if (aRole == roles::ROWGROUP) {
// Orphaned rowgroups outside the context of a table.
const Accessible* table = FindAncestorIf([](const Accessible& aAcc) {
return aAcc.IsTable() ? AncestorSearchOption::Found
: AncestorSearchOption::NotFound;
});
if (!table) {
return NativeRole();
}
} else if (aRole == roles::GRID_CELL || aRole == roles::ROWHEADER ||
aRole == roles::COLUMNHEADER) {
// Orphaned gridcell/rowheader/columnheader outside the context of a row.
const Accessible* row = FindAncestorIf([](const Accessible& aAcc) {
return aAcc.IsTableRow() ? AncestorSearchOption::Found
: AncestorSearchOption::NotFound;
});
if (!row) {
return NativeRole();
}
} else if (aRole == roles::LISTITEM) {
// doc-biblioentry and doc-endnote should not be treated as listitems.
const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
if (!roleMapEntry || (roleMapEntry->roleAtom != nsGkAtoms::docBiblioentry &&
roleMapEntry->roleAtom != nsGkAtoms::docEndnote)) {
// Orphaned listitem outside the context of a list.
const Accessible* list = FindAncestorIf([](const Accessible& aAcc) {
return aAcc.IsList() ? AncestorSearchOption::Found
: AncestorSearchOption::Continue;
});
if (!list) {
return NativeRole();
}
}
} else if (aRole == roles::PAGETAB) {
// Orphaned tab outside the context of a tablist.
const Accessible* tablist = FindAncestorIf([](const Accessible& aAcc) {
return aAcc.Role() == roles::PAGETABLIST ? AncestorSearchOption::Found
: AncestorSearchOption::NotFound;
});
if (!tablist) {
return NativeRole();
}
} else if (aRole == roles::OUTLINEITEM) {
// Orphaned treeitem outside the context of a tree.
const Accessible* tree = FindAncestorIf([](const Accessible& aAcc) {
return aAcc.Role() == roles::OUTLINE ? AncestorSearchOption::Found
: AncestorSearchOption::Continue;
});
if (!tree) {
return NativeRole();
}
}
return aRole;
}
role LocalAccessible::GetMinimumRole(role aRole) const {
if (aRole != roles::TEXT && aRole != roles::TEXT_CONTAINER &&
aRole != roles::SECTION) {
// This isn't a generic role, so aRole is specific enough.
return aRole;
}
dom::Element* el = Elm();
if (el && el->IsHTMLElement() && el->HasAttr(nsGkAtoms::popover)) {
return roles::GROUPING;
}
return aRole;
}
role LocalAccessible::NativeRole() const { return roles::NOTHING; }
uint8_t LocalAccessible::ActionCount() const {
return HasPrimaryAction() || ActionAncestor() ? 1 : 0;
}
void LocalAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName) {
aName.Truncate();
if (aIndex != 0) return;
uint32_t actionRule = GetActionRule();
switch (actionRule) {
case eActivateAction:
aName.AssignLiteral("activate");
return;
case eClickAction:
aName.AssignLiteral("click");
return;
case ePressAction:
aName.AssignLiteral("press");
return;
case eCheckUncheckAction: {
uint64_t state = State();
if (state & states::CHECKED) {
aName.AssignLiteral("uncheck");
} else if (state & states::MIXED) {
aName.AssignLiteral("cycle");
} else {
aName.AssignLiteral("check");
}
return;
}
case eJumpAction:
aName.AssignLiteral("jump");
return;
case eOpenCloseAction:
if (State() & states::COLLAPSED) {
aName.AssignLiteral("open");
} else {
aName.AssignLiteral("close");
}
return;
case eSelectAction:
aName.AssignLiteral("select");
return;
case eSwitchAction:
aName.AssignLiteral("switch");
return;
case eSortAction:
aName.AssignLiteral("sort");
return;
case eExpandAction:
if (State() & states::COLLAPSED) {
aName.AssignLiteral("expand");
} else {
aName.AssignLiteral("collapse");
}
return;
}
if (ActionAncestor()) {
aName.AssignLiteral("clickAncestor");
return;
}
}
bool LocalAccessible::DoAction(uint8_t aIndex) const {
if (aIndex != 0) return false;
if (HasPrimaryAction() || ActionAncestor()) {
DoCommand();
return true;
}
return false;
}
bool LocalAccessible::HasPrimaryAction() const {
return GetActionRule() != eNoAction;
}
nsIContent* LocalAccessible::GetAtomicRegion() const {
nsIContent* loopContent = mContent;
nsAutoString atomic;
while (loopContent &&
(!loopContent->IsElement() ||
!nsAccUtils::GetARIAAttr(loopContent->AsElement(),
nsGkAtoms::aria_atomic, atomic))) {
loopContent = loopContent->GetParent();
}
return atomic.EqualsLiteral("true") ? loopContent : nullptr;
}
LocalAccessible* LocalAccessible::GetPopoverTargetDetailsRelation() const {
dom::Element* targetEl = mContent->GetEffectivePopoverTargetElement();
if (!targetEl) {
return nullptr;
}
LocalAccessible* targetAcc = mDoc->GetAccessible(targetEl);
if (!targetAcc) {
return nullptr;
}
// Even if the popovertarget is valid, there are a few cases where we must not
// expose it via the details relation.
if (const nsAttrValue* actionVal =
Elm()->GetParsedAttr(nsGkAtoms::popovertargetaction)) {
if (static_cast<PopoverTargetAction>(actionVal->GetEnumValue()) ==
PopoverTargetAction::Hide) {
return nullptr;
}
}
if (targetAcc->NextSibling() == this || targetAcc->PrevSibling() == this) {
return nullptr;
}
return targetAcc;
}
Relation LocalAccessible::RelationByType(RelationType aType) const {
if (!HasOwnContent()) return Relation();
const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
// Relationships are defined on the same content node that the role would be
// defined on.
switch (aType) {
case RelationType::LABELLED_BY: {
Relation rel(new AssociatedElementsIterator(mDoc, mContent,
nsGkAtoms::aria_labelledby));
if (mContent->IsHTMLElement()) {
rel.AppendIter(new HTMLLabelIterator(Document(), this));
}
rel.AppendIter(new XULLabelIterator(Document(), mContent));
return rel;
}
case RelationType::LABEL_FOR: {
Relation rel(new RelatedAccIterator(Document(), mContent,
nsGkAtoms::aria_labelledby));
if (mContent->IsXULElement(nsGkAtoms::label)) {
rel.AppendIter(
new AssociatedElementsIterator(mDoc, mContent, nsGkAtoms::control));
}
return rel;
}
case RelationType::DESCRIBED_BY: {
Relation rel(new AssociatedElementsIterator(mDoc, mContent,
nsGkAtoms::aria_describedby));
if (mContent->IsXULElement()) {
rel.AppendIter(new XULDescriptionIterator(Document(), mContent));
}
return rel;
}
case RelationType::DESCRIPTION_FOR: {
Relation rel(new RelatedAccIterator(Document(), mContent,
nsGkAtoms::aria_describedby));
// This affectively adds an optional control attribute to xul:description,
// which only affects accessibility, by allowing the description to be
// tied to a control.
if (mContent->IsXULElement(nsGkAtoms::description)) {
rel.AppendIter(
new AssociatedElementsIterator(mDoc, mContent, nsGkAtoms::control));
}
return rel;
}
case RelationType::NODE_CHILD_OF: {
Relation rel;
// This is an ARIA tree or treegrid that doesn't use owns, so we need to
// get the parent the hard way.
if (roleMapEntry && (roleMapEntry->role == roles::OUTLINEITEM ||
roleMapEntry->role == roles::LISTITEM ||
roleMapEntry->role == roles::ROW)) {
AccGroupInfo* groupInfo =
const_cast<LocalAccessible*>(this)->GetOrCreateGroupInfo();
if (groupInfo) {
Accessible* parent = groupInfo->ConceptualParent();
if (parent) {
MOZ_ASSERT(parent->IsLocal());
rel.AppendTarget(parent->AsLocal());
}
}
}
// If this is an OOP iframe document, we can't support NODE_CHILD_OF
// here, since the iframe resides in a different process. This is fine
// because the client will then request the parent instead, which will be
// correctly handled by platform code.
if (XRE_IsContentProcess() && IsRoot()) {
dom::Document* doc =
const_cast<LocalAccessible*>(this)->AsDoc()->DocumentNode();
dom::BrowsingContext* bc = doc->GetBrowsingContext();
MOZ_ASSERT(bc);
if (!bc->Top()->IsInProcess()) {
return rel;
}
}
// If accessible is in its own Window, or is the root of a document,
// then we should provide NODE_CHILD_OF relation so that MSAA clients
// can easily get to true parent instead of getting to oleacc's
// ROLE_WINDOW accessible which will prevent us from going up further
// (because it is system generated and has no idea about the hierarchy
// above it).
nsIFrame* frame = GetFrame();
if (frame) {
nsView* view = frame->GetView();
if (view) {
ScrollContainerFrame* scrollContainerFrame = do_QueryFrame(frame);
if (scrollContainerFrame || view->GetWidget() ||
!frame->GetParent()) {
rel.AppendTarget(LocalParent());
}
}
}
return rel;
}
case RelationType::NODE_PARENT_OF: {
// ARIA tree or treegrid can do the hierarchy by @aria-level, ARIA trees
// also can be organized by groups.
if (roleMapEntry && (roleMapEntry->role == roles::OUTLINEITEM ||
roleMapEntry->role == roles::LISTITEM ||
roleMapEntry->role == roles::ROW ||
roleMapEntry->role == roles::OUTLINE ||
roleMapEntry->role == roles::LIST ||
roleMapEntry->role == roles::TREE_TABLE)) {
return Relation(new ItemIterator(this));
}
return Relation();
}
case RelationType::CONTROLLED_BY:
return Relation(new RelatedAccIterator(Document(), mContent,
nsGkAtoms::aria_controls));
case RelationType::CONTROLLER_FOR: {
Relation rel(new AssociatedElementsIterator(mDoc, mContent,
nsGkAtoms::aria_controls));
rel.AppendIter(new HTMLOutputIterator(Document(), mContent));
return rel;
}
case RelationType::FLOWS_TO:
return Relation(new AssociatedElementsIterator(mDoc, mContent,
nsGkAtoms::aria_flowto));
case RelationType::FLOWS_FROM:
return Relation(
new RelatedAccIterator(Document(), mContent, nsGkAtoms::aria_flowto));
case RelationType::MEMBER_OF: {
if (Role() == roles::RADIOBUTTON) {
/* If we see a radio button role here, we're dealing with an aria
* radio button (because input=radio buttons are
* HTMLRadioButtonAccessibles) */
Relation rel = Relation();
LocalAccessible* currParent = LocalParent();
while (currParent && currParent->Role() != roles::RADIO_GROUP) {
currParent = currParent->LocalParent();
}
if (currParent && currParent->Role() == roles::RADIO_GROUP) {
/* If we found a radiogroup parent, search for all
* roles::RADIOBUTTON children and add them to our relation.
* This search will include the radio button this method
* was called from, which is expected. */
Pivot p = Pivot(currParent);
PivotRoleRule rule(roles::RADIOBUTTON);
Accessible* match = p.Next(currParent, rule);
while (match) {
MOZ_ASSERT(match->IsLocal(),
"We shouldn't find any remote accs while building our "
"relation!");
rel.AppendTarget(match->AsLocal());
match = p.Next(match, rule);
}
}
/* By webkit's standard, aria radio buttons do not get grouped
* if they lack a group parent, so we return an empty
* relation here if the above check fails. */
return rel;
}
return Relation(mDoc, GetAtomicRegion());
}
case RelationType::LINKS_TO: {
Relation rel = Relation();
if (Role() == roles::LINK) {
dom::HTMLAnchorElement* anchor =
dom::HTMLAnchorElement::FromNode(mContent);
if (!anchor) {
return rel;
}
// If this node is an anchor element, query its hash to find the
// target.
nsAutoCString hash;
anchor->GetHash(hash);
if (hash.IsEmpty()) {
return rel;
}
// GetHash returns an ID or name with a leading '#', trim it so we can
// search the doc by ID or name alone.
NS_ConvertUTF8toUTF16 hash16(Substring(hash, 1));
if (dom::Element* elm = mContent->OwnerDoc()->GetElementById(hash16)) {
rel.AppendTarget(mDoc->GetAccessibleOrContainer(elm));
} else if (nsCOMPtr<nsINodeList> list =
mContent->OwnerDoc()->GetElementsByName(hash16)) {
// Loop through the named nodes looking for the first anchor
uint32_t length = list->Length();
for (uint32_t i = 0; i < length; i++) {
nsIContent* node = list->Item(i);
if (node->IsHTMLElement(nsGkAtoms::a)) {
rel.AppendTarget(mDoc->GetAccessibleOrContainer(node));
break;
}
}
}
}
return rel;
}
case RelationType::SUBWINDOW_OF:
case RelationType::EMBEDS:
case RelationType::EMBEDDED_BY:
case RelationType::POPUP_FOR:
case RelationType::PARENT_WINDOW_OF:
return Relation();
case RelationType::DEFAULT_BUTTON: {
if (mContent->IsHTMLElement()) {
// HTML form controls implements nsIFormControl interface.
if (auto* control = nsIFormControl::FromNode(mContent)) {
if (dom::HTMLFormElement* form = control->GetForm()) {
return Relation(mDoc, form->GetDefaultSubmitElement());
}
}
} else {
// In XUL, use first <button default="true" .../> in the document
dom::Document* doc = mContent->OwnerDoc();
nsIContent* buttonEl = nullptr;
if (doc->AllowXULXBL()) {
nsCOMPtr<nsIHTMLCollection> possibleDefaultButtons =
doc->GetElementsByAttribute(u"default"_ns, u"true"_ns);
if (possibleDefaultButtons) {
uint32_t length = possibleDefaultButtons->Length();
// Check for button in list of default="true" elements
for (uint32_t count = 0; count < length && !buttonEl; count++) {
nsIContent* item = possibleDefaultButtons->Item(count);
RefPtr<nsIDOMXULButtonElement> button =
item->IsElement() ? item->AsElement()->AsXULButton()
: nullptr;
if (button) {
buttonEl = item;
}
}
}
return Relation(mDoc, buttonEl);
}
}
return Relation();
}
case RelationType::CONTAINING_DOCUMENT:
return Relation(mDoc);
case RelationType::CONTAINING_TAB_PANE: {
nsCOMPtr<nsIDocShell> docShell = nsCoreUtils::GetDocShellFor(GetNode());
if (docShell) {
// Walk up the parent chain without crossing the boundary at which item
// types change, preventing us from walking up out of tab content.
nsCOMPtr<nsIDocShellTreeItem> root;
docShell->GetInProcessSameTypeRootTreeItem(getter_AddRefs(root));
if (root) {
// If the item type is typeContent, we assume we are in browser tab
// content. Note, this includes content such as about:addons,
// for consistency.
if (root->ItemType() == nsIDocShellTreeItem::typeContent) {
return Relation(nsAccUtils::GetDocAccessibleFor(root));
}
}
}
return Relation();
}
case RelationType::CONTAINING_APPLICATION:
return Relation(ApplicationAcc());
case RelationType::DETAILS: {
if (mContent->IsElement() &&
nsAccUtils::HasARIAAttr(mContent->AsElement(),
nsGkAtoms::aria_details)) {
return Relation(new AssociatedElementsIterator(
mDoc, mContent, nsGkAtoms::aria_details));
}
if (LocalAccessible* target = GetPopoverTargetDetailsRelation()) {
return Relation(target);
}
return Relation();
}
case RelationType::DETAILS_FOR: {
Relation rel(
new RelatedAccIterator(mDoc, mContent, nsGkAtoms::aria_details));
RelatedAccIterator invokers(mDoc, mContent, nsGkAtoms::popovertarget);
while (Accessible* invoker = invokers.Next()) {
// We should only expose DETAILS_FOR if DETAILS was exposed on the
// invoker. However, DETAILS exposure on popover invokers is
// conditional.
LocalAccessible* popoverTarget =
invoker->AsLocal()->GetPopoverTargetDetailsRelation();
if (popoverTarget) {
MOZ_ASSERT(popoverTarget == this);
rel.AppendTarget(invoker);
}
}
return rel;
}
case RelationType::ERRORMSG:
return Relation(new AssociatedElementsIterator(
mDoc, mContent, nsGkAtoms::aria_errormessage));
case RelationType::ERRORMSG_FOR:
return Relation(
new RelatedAccIterator(mDoc, mContent, nsGkAtoms::aria_errormessage));
default:
return Relation();
}
}
void LocalAccessible::GetNativeInterface(void** aNativeAccessible) {}
void LocalAccessible::DoCommand(uint32_t aActionIndex) const {
NS_DispatchToMainThread(NS_NewRunnableFunction(
"LocalAccessible::DispatchClickEvent",
[aActionIndex, acc = RefPtr{this}]() MOZ_CAN_RUN_SCRIPT_BOUNDARY {
acc->DispatchClickEvent(aActionIndex);
}));
}
void LocalAccessible::DispatchClickEvent(uint32_t aActionIndex) const {
if (IsDefunct()) return;
MOZ_ASSERT(mContent);
RefPtr<PresShell> presShell = mDoc->PresShellPtr();
// Scroll into view.
presShell->ScrollContentIntoView(mContent, ScrollAxis(), ScrollAxis(),
ScrollFlags::ScrollOverflowHidden);
AutoWeakFrame frame = GetFrame();
if (!frame) {
return;
}
// We use RelativeBounds rather than querying the frame directly because of
// special cases like image map areas which don't have their own frame.
// RelativeBounds overrides handle these special cases.
nsIFrame* boundingFrame = nullptr;
nsRect rect = RelativeBounds(&boundingFrame);
MOZ_ASSERT(boundingFrame);
// Compute x and y coordinates in dev pixels relative to the widget.
nsPoint offsetToWidget;
nsCOMPtr<nsIWidget> widget = boundingFrame->GetNearestWidget(offsetToWidget);
if (!widget) {
return;
}
rect += offsetToWidget;
RefPtr<nsPresContext> presContext = presShell->GetPresContext();
int32_t x = presContext->AppUnitsToDevPixels(rect.x + rect.width / 2);
int32_t y = presContext->AppUnitsToDevPixels(rect.y + rect.height / 2);
// Simulate a touch interaction by dispatching touch events with mouse events.
// Even though we calculated x and y using the bounding frame, we must use the
// primary frame for the event. In most cases, these two frames will be
// different, but they are the same for special cases such as image map areas
// which don't have their own frame.
nsCoreUtils::DispatchTouchEvent(eTouchStart, x, y, mContent, frame, presShell,
widget);
if (StaticPrefs::dom_popup_experimental()) {
mContent->OwnerDoc()->NotifyUserGestureActivation();
}
nsCoreUtils::DispatchMouseEvent(eMouseDown, x, y, mContent, frame, presShell,
widget);
nsCoreUtils::DispatchTouchEvent(eTouchEnd, x, y, mContent, frame, presShell,
widget);
nsCoreUtils::DispatchMouseEvent(eMouseUp, x, y, mContent, frame, presShell,
widget);
}
void LocalAccessible::ScrollToPoint(uint32_t aCoordinateType, int32_t aX,
int32_t aY) {
nsIFrame* frame = GetFrame();
if (!frame) return;
LayoutDeviceIntPoint coords =
nsAccUtils::ConvertToScreenCoords(aX, aY, aCoordinateType, this);
nsIFrame* parentFrame = frame;
while ((parentFrame = parentFrame->GetParent())) {
nsCoreUtils::ScrollFrameToPoint(parentFrame, frame, coords);
}
}
void LocalAccessible::AppendTextTo(nsAString& aText, uint32_t aStartOffset,
uint32_t aLength) {
// Return text representation of non-text accessible within hypertext
// accessible. Text accessible overrides this method to return enclosed text.
if (aStartOffset != 0 || aLength == 0) return;
MOZ_ASSERT(mParent,
"Called on accessible unbound from tree. Result can be wrong.");
nsIFrame* frame = GetFrame();
// We handle something becoming display: none async, which means we won't have
// a frame when we're queuing text removed events. Thus, it's important that
// we produce text here even if there's no frame. Otherwise, we won't fire a
// text removed event at all, which might leave client caches (e.g. NVDA
// virtual buffers) with dead nodes.
if (IsHTMLBr() || (frame && frame->IsBrFrame())) {
aText += kForcedNewLineChar;
} else if (mParent && nsAccUtils::MustPrune(mParent)) {
// Expose the embedded object accessible as imaginary embedded object
// character if its parent hypertext accessible doesn't expose children to
// AT.
aText += kImaginaryEmbeddedObjectChar;
} else {
aText += kEmbeddedObjectChar;
}
}
void LocalAccessible::Shutdown() {
// Mark the accessible as defunct, invalidate the child count and pointers to
// other accessibles, also make sure none of its children point to this
// parent
mStateFlags |= eIsDefunct;
int32_t childCount = mChildren.Length();
for (int32_t childIdx = 0; childIdx < childCount; childIdx++) {
mChildren.ElementAt(childIdx)->UnbindFromParent();
}
mChildren.Clear();
mEmbeddedObjCollector = nullptr;
if (mParent) mParent->RemoveChild(this);
mContent = nullptr;
mDoc = nullptr;
if (SelectionMgr() && SelectionMgr()->AccessibleWithCaret(nullptr) == this) {
SelectionMgr()->ResetCaretOffset();
}
}
// LocalAccessible protected
void LocalAccessible::ARIAName(nsString& aName) const {
// 'slot' elements should ignore aria-label and aria-labelledby.
if (mContent->IsHTMLElement(nsGkAtoms::slot)) {
return;
}
// aria-labelledby now takes precedence over aria-label
nsresult rv = nsTextEquivUtils::GetTextEquivFromIDRefs(
this, nsGkAtoms::aria_labelledby, aName);
if (NS_SUCCEEDED(rv)) {
aName.CompressWhitespace();
}
if (aName.IsEmpty() && mContent->IsElement() &&
nsAccUtils::GetARIAAttr(mContent->AsElement(), nsGkAtoms::aria_label,
aName)) {
aName.CompressWhitespace();
}
}
// LocalAccessible protected
void LocalAccessible::ARIADescription(nsString& aDescription) const {
// aria-describedby takes precedence over aria-description
nsresult rv = nsTextEquivUtils::GetTextEquivFromIDRefs(
this, nsGkAtoms::aria_describedby, aDescription);
if (NS_SUCCEEDED(rv)) {
aDescription.CompressWhitespace();
}
if (aDescription.IsEmpty() && mContent->IsElement() &&
nsAccUtils::GetARIAAttr(mContent->AsElement(),
nsGkAtoms::aria_description, aDescription)) {
aDescription.CompressWhitespace();
}
}
// LocalAccessible protected
ENameValueFlag LocalAccessible::NativeName(nsString& aName) const {
if (mContent->IsHTMLElement()) {
LocalAccessible* label = nullptr;
HTMLLabelIterator iter(Document(), this);
while ((label = iter.Next())) {
nsTextEquivUtils::AppendTextEquivFromContent(this, label->GetContent(),
&aName);
aName.CompressWhitespace();
}
if (!aName.IsEmpty()) return eNameOK;
NameFromAssociatedXULLabel(mDoc, mContent, aName);
if (!aName.IsEmpty()) {
return eNameOK;
}
nsTextEquivUtils::GetNameFromSubtree(this, aName);
return aName.IsEmpty() ? eNameOK : eNameFromSubtree;
}
if (mContent->IsXULElement()) {
XULElmName(mDoc, mContent, aName);
if (!aName.IsEmpty()) return eNameOK;
nsTextEquivUtils::GetNameFromSubtree(this, aName);
return aName.IsEmpty() ? eNameOK : eNameFromSubtree;
}
if (mContent->IsSVGElement()) {
// If user agents need to choose among multiple 'desc' or 'title'
// elements for processing, the user agent shall choose the first one.
for (nsIContent* childElm = mContent->GetFirstChild(); childElm;
childElm = childElm->GetNextSibling()) {
if (childElm->IsSVGElement(nsGkAtoms::title)) {
nsTextEquivUtils::AppendTextEquivFromContent(this, childElm, &aName);
return eNameOK;
}
}
}
return eNameOK;
}
// LocalAccessible protected
void LocalAccessible::NativeDescription(nsString& aDescription) const {
bool isXUL = mContent->IsXULElement();
if (isXUL) {
// Try XUL <description control="[id]">description text</description>
XULDescriptionIterator iter(Document(), mContent);
LocalAccessible* descr = nullptr;
while ((descr = iter.Next())) {
nsTextEquivUtils::AppendTextEquivFromContent(this, descr->GetContent(),
&aDescription);
}
}
}
// LocalAccessible protected
void LocalAccessible::BindToParent(LocalAccessible* aParent,
uint32_t aIndexInParent) {
MOZ_ASSERT(aParent, "This method isn't used to set null parent");
MOZ_ASSERT(!mParent, "The child was expected to be moved");
#ifdef A11Y_LOG
if (mParent) {
logging::TreeInfo("BindToParent: stealing accessible", 0, "old parent",
mParent, "new parent", aParent, "child", this, nullptr);
}
#endif
mParent = aParent;
mIndexInParent = aIndexInParent;
if (mParent->HasNameDependent() || mParent->IsXULListItem() ||
RelationByType(RelationType::LABEL_FOR).Next() ||
nsTextEquivUtils::HasNameRule(mParent, eNameFromSubtreeRule)) {
mContextFlags |= eHasNameDependent;
} else {
mContextFlags &= ~eHasNameDependent;
}
if (mParent->HasDescriptionDependent() ||
RelationByType(RelationType::DESCRIPTION_FOR).Next()) {
mContextFlags |= eHasDescriptionDependent;
} else {
mContextFlags &= ~eHasDescriptionDependent;
}
// Add name/description dependent flags for dependent content once
// a name/description provider is added to doc.
Relation rel = RelationByType(RelationType::LABELLED_BY);
LocalAccessible* relTarget = nullptr;
while ((relTarget = rel.LocalNext())) {
if (!relTarget->HasNameDependent()) {
relTarget->ModifySubtreeContextFlags(eHasNameDependent, true);
}
}
rel = RelationByType(RelationType::DESCRIBED_BY);
while ((relTarget = rel.LocalNext())) {
if (!relTarget->HasDescriptionDependent()) {
relTarget->ModifySubtreeContextFlags(eHasDescriptionDependent, true);
}
}
mContextFlags |=
static_cast<uint32_t>((mParent->IsAlert() || mParent->IsInsideAlert())) &
eInsideAlert;
if (IsTableCell()) {
CachedTableAccessible::Invalidate(this);
}
}
// LocalAccessible protected
void LocalAccessible::UnbindFromParent() {
// We do this here to handle document shutdown and an Accessible being moved.
// We do this for subtree removal in DocAccessible::UncacheChildrenInSubtree.
if (IsTable() || IsTableCell()) {
CachedTableAccessible::Invalidate(this);
}
mParent = nullptr;
mIndexInParent = -1;
mIndexOfEmbeddedChild = -1;
delete mGroupInfo;
mGroupInfo = nullptr;
mContextFlags &= ~eHasNameDependent & ~eInsideAlert;
}
////////////////////////////////////////////////////////////////////////////////
// LocalAccessible public methods
RootAccessible* LocalAccessible::RootAccessible() const {
nsCOMPtr<nsIDocShell> docShell = nsCoreUtils::GetDocShellFor(GetNode());
NS_ASSERTION(docShell, "No docshell for mContent");
if (!docShell) {
return nullptr;
}
nsCOMPtr<nsIDocShellTreeItem> root;
docShell->GetInProcessRootTreeItem(getter_AddRefs(root));
NS_ASSERTION(root, "No root content tree item");
if (!root) {
return nullptr;
}
DocAccessible* docAcc = nsAccUtils::GetDocAccessibleFor(root);
return docAcc ? docAcc->AsRoot() : nullptr;
}
nsIFrame* LocalAccessible::GetFrame() const {
return mContent ? mContent->GetPrimaryFrame() : nullptr;
}
nsINode* LocalAccessible::GetNode() const { return mContent; }
dom::Element* LocalAccessible::Elm() const {
return dom::Element::FromNodeOrNull(mContent);
}
void LocalAccessible::Language(nsAString& aLanguage) {
aLanguage.Truncate();
if (!mDoc) return;
nsCoreUtils::GetLanguageFor(mContent, nullptr, aLanguage);
if (aLanguage.IsEmpty()) { // Nothing found, so use document's language
mDoc->DocumentNode()->GetHeaderData(nsGkAtoms::headerContentLanguage,
aLanguage);
}
}
bool LocalAccessible::InsertChildAt(uint32_t aIndex, LocalAccessible* aChild) {
if (!aChild) return false;
if (aIndex == mChildren.Length()) {
// pretended earlier.
mChildren.AppendElement(aChild);
} else {
// pretended earlier.
mChildren.InsertElementAt(aIndex, aChild);
MOZ_ASSERT(mStateFlags & eKidsMutating, "Illicit children change");
for (uint32_t idx = aIndex + 1; idx < mChildren.Length(); idx++) {
mChildren[idx]->mIndexInParent = idx;
}
}
if (aChild->IsText()) {
mStateFlags |= eHasTextKids;
}
aChild->BindToParent(this, aIndex);
return true;
}
bool LocalAccessible::RemoveChild(LocalAccessible* aChild) {
MOZ_DIAGNOSTIC_ASSERT(aChild, "No child was given");
MOZ_DIAGNOSTIC_ASSERT(aChild->mParent, "No parent");
MOZ_DIAGNOSTIC_ASSERT(aChild->mParent == this, "Wrong parent");
MOZ_DIAGNOSTIC_ASSERT(aChild->mIndexInParent != -1,
"Unbound child was given");
MOZ_DIAGNOSTIC_ASSERT((mStateFlags & eKidsMutating) || aChild->IsDefunct() ||
aChild->IsDoc() || IsApplication(),
"Illicit children change");
int32_t index = static_cast<uint32_t>(aChild->mIndexInParent);
if (mChildren.SafeElementAt(index) != aChild) {
MOZ_ASSERT_UNREACHABLE("A wrong child index");
index = mChildren.IndexOf(aChild);
if (index == -1) {
MOZ_ASSERT_UNREACHABLE("No child was found");
return false;
}
}
aChild->UnbindFromParent();
mChildren.RemoveElementAt(index);
for (uint32_t idx = index; idx < mChildren.Length(); idx++) {
mChildren[idx]->mIndexInParent = idx;
}
return true;
}
void LocalAccessible::RelocateChild(uint32_t aNewIndex,
LocalAccessible* aChild) {
MOZ_DIAGNOSTIC_ASSERT(aChild, "No child was given");
MOZ_DIAGNOSTIC_ASSERT(aChild->mParent == this,
"A child from different subtree was given");
MOZ_DIAGNOSTIC_ASSERT(aChild->mIndexInParent != -1,
"Unbound child was given");
MOZ_DIAGNOSTIC_ASSERT(
aChild->mParent->LocalChildAt(aChild->mIndexInParent) == aChild,
"Wrong index in parent");
MOZ_DIAGNOSTIC_ASSERT(
static_cast<uint32_t>(aChild->mIndexInParent) != aNewIndex,
"No move, same index");
MOZ_DIAGNOSTIC_ASSERT(aNewIndex <= mChildren.Length(),
"Wrong new index was given");
RefPtr<AccHideEvent> hideEvent = new AccHideEvent(aChild, false);
if (mDoc->Controller()->QueueMutationEvent(hideEvent)) {
aChild->SetHideEventTarget(true);
}
mEmbeddedObjCollector = nullptr;
mChildren.RemoveElementAt(aChild->mIndexInParent);
uint32_t startIdx = aNewIndex, endIdx = aChild->mIndexInParent;
// If the child is moved after its current position.
if (static_cast<uint32_t>(aChild->mIndexInParent) < aNewIndex) {
startIdx = aChild->mIndexInParent;
if (aNewIndex == mChildren.Length() + 1) {
// The child is moved to the end.
mChildren.AppendElement(aChild);
endIdx = mChildren.Length() - 1;
} else {
mChildren.InsertElementAt(aNewIndex - 1, aChild);
endIdx = aNewIndex;
}
} else {
// The child is moved prior its current position.
mChildren.InsertElementAt(aNewIndex, aChild);
}
for (uint32_t idx = startIdx; idx <= endIdx; idx++) {
mChildren[idx]->mIndexInParent = idx;
mChildren[idx]->mIndexOfEmbeddedChild = -1;
}
for (uint32_t idx = 0; idx < mChildren.Length(); idx++) {
mChildren[idx]->mStateFlags |= eGroupInfoDirty;
}
RefPtr<AccShowEvent> showEvent = new AccShowEvent(aChild);
DebugOnly<bool> added = mDoc->Controller()->QueueMutationEvent(showEvent);
MOZ_ASSERT(added);
aChild->SetShowEventTarget(true);
}
LocalAccessible* LocalAccessible::LocalChildAt(uint32_t aIndex) const {
LocalAccessible* child = mChildren.SafeElementAt(aIndex, nullptr);
if (!child) return nullptr;
#ifdef DEBUG
LocalAccessible* realParent = child->mParent;
NS_ASSERTION(!realParent || realParent == this,
"Two accessibles have the same first child accessible!");
#endif
return child;
}
uint32_t LocalAccessible::ChildCount() const { return mChildren.Length(); }
int32_t LocalAccessible::IndexInParent() const { return mIndexInParent; }
uint32_t LocalAccessible::EmbeddedChildCount() {
if (mStateFlags & eHasTextKids) {
if (!mEmbeddedObjCollector) {
mEmbeddedObjCollector.reset(new EmbeddedObjCollector(this));
}
return mEmbeddedObjCollector->Count();
}
return ChildCount();
}
Accessible* LocalAccessible::EmbeddedChildAt(uint32_t aIndex) {
if (mStateFlags & eHasTextKids) {
if (!mEmbeddedObjCollector) {
mEmbeddedObjCollector.reset(new EmbeddedObjCollector(this));
}
return mEmbeddedObjCollector.get()
? mEmbeddedObjCollector->GetAccessibleAt(aIndex)
: nullptr;
}
return ChildAt(aIndex);
}
int32_t LocalAccessible::IndexOfEmbeddedChild(Accessible* aChild) {
MOZ_ASSERT(aChild->IsLocal());
if (mStateFlags & eHasTextKids) {
if (!mEmbeddedObjCollector) {
mEmbeddedObjCollector.reset(new EmbeddedObjCollector(this));
}
return mEmbeddedObjCollector.get()
? mEmbeddedObjCollector->GetIndexAt(aChild->AsLocal())
: -1;
}
return GetIndexOf(aChild->AsLocal());
}
////////////////////////////////////////////////////////////////////////////////
// HyperLinkAccessible methods
bool LocalAccessible::IsLink() const {
// Every embedded accessible within hypertext accessible implements
// hyperlink interface.
return mParent && mParent->IsHyperText() && !IsText();
}
////////////////////////////////////////////////////////////////////////////////
// SelectAccessible
void LocalAccessible::SelectedItems(nsTArray<Accessible*>* aItems) {
AccIterator iter(this, filters::GetSelected);
LocalAccessible* selected = nullptr;
while ((selected = iter.Next())) aItems->AppendElement(selected);
}
uint32_t LocalAccessible::SelectedItemCount() {
uint32_t count = 0;
AccIterator iter(this, filters::GetSelected);
LocalAccessible* selected = nullptr;
while ((selected = iter.Next())) ++count;
return count;
}
Accessible* LocalAccessible::GetSelectedItem(uint32_t aIndex) {
AccIterator iter(this, filters::GetSelected);
LocalAccessible* selected = nullptr;
uint32_t index = 0;
while ((selected = iter.Next()) && index < aIndex) index++;
return selected;
}
bool LocalAccessible::IsItemSelected(uint32_t aIndex) {
uint32_t index = 0;
AccIterator iter(this, filters::GetSelectable);
LocalAccessible* selected = nullptr;
while ((selected = iter.Next()) && index < aIndex) index++;
return selected && selected->State() & states::SELECTED;
}
bool LocalAccessible::AddItemToSelection(uint32_t aIndex) {
uint32_t index = 0;
AccIterator iter(this, filters::GetSelectable);
LocalAccessible* selected = nullptr;
while ((selected = iter.Next()) && index < aIndex) index++;
if (selected) selected->SetSelected(true);
return static_cast<bool>(selected);
}
bool LocalAccessible::RemoveItemFromSelection(uint32_t aIndex) {
uint32_t index = 0;
AccIterator iter(this, filters::GetSelectable);
LocalAccessible* selected = nullptr;
while ((selected = iter.Next()) && index < aIndex) index++;
if (selected) selected->SetSelected(false);
return static_cast<bool>(selected);
}
bool LocalAccessible::SelectAll() {
bool success = false;
LocalAccessible* selectable = nullptr;
AccIterator iter(this, filters::GetSelectable);
while ((selectable = iter.Next())) {
success = true;
selectable->SetSelected(true);
}
return success;
}
bool LocalAccessible::UnselectAll() {
bool success = false;
LocalAccessible* selected = nullptr;
AccIterator iter(this, filters::GetSelected);
while ((selected = iter.Next())) {
success = true;
selected->SetSelected(false);
}
return success;
}
////////////////////////////////////////////////////////////////////////////////
// Widgets
bool LocalAccessible::IsWidget() const { return false; }
bool LocalAccessible::IsActiveWidget() const {
if (FocusMgr()->HasDOMFocus(mContent)) return true;
// If text entry of combobox widget has a focus then the combobox widget is
// active.
const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
if (roleMapEntry && roleMapEntry->Is(nsGkAtoms::combobox)) {
uint32_t childCount = ChildCount();
for (uint32_t idx = 0; idx < childCount; idx++) {
LocalAccessible* child = mChildren.ElementAt(idx);
if (child->Role() == roles::ENTRY) {
return FocusMgr()->HasDOMFocus(child->GetContent());
}
}
}
return false;
}
bool LocalAccessible::AreItemsOperable() const {
return HasOwnContent() && mContent->IsElement() &&
mContent->AsElement()->HasAttr(nsGkAtoms::aria_activedescendant);
}
LocalAccessible* LocalAccessible::CurrentItem() const {
// Check for aria-activedescendant, which changes which element has focus.
// For activedescendant, the ARIA spec does not require that the user agent
// checks whether pointed node is actually a DOM descendant of the element
// with the aria-activedescendant attribute.
if (HasOwnContent() && mContent->IsElement()) {
if (dom::Element* activeDescendantElm =
nsCoreUtils::GetAriaActiveDescendantElement(
mContent->AsElement())) {
if (mContent->IsInclusiveDescendantOf(activeDescendantElm)) {
// Don't want a cyclical descendant relationship. That would be bad.
return nullptr;
}
DocAccessible* document = Document();
if (document) return document->GetAccessible(activeDescendantElm);
}
}
return nullptr;
}
void LocalAccessible::SetCurrentItem(const LocalAccessible* aItem) {}
LocalAccessible* LocalAccessible::ContainerWidget() const {
if (HasARIARole() && mContent->HasID()) {
for (LocalAccessible* parent = LocalParent(); parent;
parent = parent->LocalParent()) {
nsIContent* parentContent = parent->GetContent();
if (parentContent && parentContent->IsElement() &&
nsCoreUtils::GetAriaActiveDescendantElement(
parentContent->AsElement())) {
return parent;
}
// Don't cross DOM document boundaries.
if (parent->IsDoc()) break;
}
}
return nullptr;
}
bool LocalAccessible::IsActiveDescendantId(LocalAccessible** aWidget) const {
if (!HasOwnContent() || !mContent->HasID()) {
return false;
}
dom::DocumentOrShadowRoot* docOrShadowRoot =
mContent->GetUncomposedDocOrConnectedShadowRoot();
if (!docOrShadowRoot) {
return false;
}
nsAutoCString selector;
selector.AppendPrintf(
"[aria-activedescendant=\"%s\"]",
NS_ConvertUTF16toUTF8(mContent->GetID()->GetUTF16String()).get());
IgnoredErrorResult er;
dom::Element* widgetElm =
docOrShadowRoot->AsNode().QuerySelector(selector, er);
if (!widgetElm || er.Failed()) {
return false;
}
if (widgetElm->IsInclusiveDescendantOf(mContent)) {
// Don't want a cyclical descendant relationship. That would be bad.
return false;
}
LocalAccessible* widget = mDoc->GetAccessible(widgetElm);
if (aWidget) {
*aWidget = widget;
}
return !!widget;
}
void LocalAccessible::Announce(const nsAString& aAnnouncement,
uint16_t aPriority) {
RefPtr<AccAnnouncementEvent> event =
new AccAnnouncementEvent(this, aAnnouncement, aPriority);
nsEventShell::FireEvent(event);
}
////////////////////////////////////////////////////////////////////////////////
// LocalAccessible protected methods
void LocalAccessible::LastRelease() {
// First cleanup if needed...
if (mDoc) {
Shutdown();
NS_ASSERTION(!mDoc,
"A Shutdown() impl forgot to call its parent's Shutdown?");
}
// ... then die.
delete this;
}
LocalAccessible* LocalAccessible::GetSiblingAtOffset(int32_t aOffset,
nsresult* aError) const {
if (!mParent || mIndexInParent == -1) {
if (aError) *aError = NS_ERROR_UNEXPECTED;
return nullptr;
}
if (aError &&
mIndexInParent + aOffset >= static_cast<int32_t>(mParent->ChildCount())) {
*aError = NS_OK; // fail peacefully
return nullptr;
}
LocalAccessible* child = mParent->LocalChildAt(mIndexInParent + aOffset);
if (aError && !child) *aError = NS_ERROR_UNEXPECTED;
return child;
}
void LocalAccessible::ModifySubtreeContextFlags(uint32_t aContextFlags,
bool aAdd) {
Pivot pivot(this);
LocalAccInSameDocRule rule;
for (Accessible* anchor = this; anchor; anchor = pivot.Next(anchor, rule)) {
MOZ_ASSERT(anchor->IsLocal());
LocalAccessible* acc = anchor->AsLocal();
if (aAdd) {
acc->mContextFlags |= aContextFlags;
} else {
acc->mContextFlags &= ~aContextFlags;
}
}
}
double LocalAccessible::AttrNumericValue(nsAtom* aAttr) const {
const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
if (!roleMapEntry || roleMapEntry->valueRule == eNoValue) {
return UnspecifiedNaN<double>();
}
nsAutoString attrValue;
if (!mContent->IsElement() ||
!nsAccUtils::GetARIAAttr(mContent->AsElement(), aAttr, attrValue)) {
return UnspecifiedNaN<double>();
}
nsresult error = NS_OK;
double value = attrValue.ToDouble(&error);
return NS_FAILED(error) ? UnspecifiedNaN<double>() : value;
}
uint32_t LocalAccessible::GetActionRule() const {
if (!HasOwnContent() || (InteractiveState() & states::UNAVAILABLE)) {
return eNoAction;
}
// Return "click" action on elements that have an attached popup menu.
if (mContent->IsXULElement()) {
if (mContent->AsElement()->HasAttr(nsGkAtoms::popup)) {
return eClickAction;
}
}
// Has registered 'click' event handler.
bool isOnclick = nsCoreUtils::HasClickListener(mContent);
if (isOnclick) return eClickAction;
// Get an action based on ARIA role.
const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
if (roleMapEntry && roleMapEntry->actionRule != eNoAction) {
return roleMapEntry->actionRule;
}
// Get an action based on ARIA attribute.
if (nsAccUtils::HasDefinedARIAToken(mContent, nsGkAtoms::aria_expanded)) {
return eExpandAction;
}
return eNoAction;
}
AccGroupInfo* LocalAccessible::GetGroupInfo() const {
if (mGroupInfo && !(mStateFlags & eGroupInfoDirty)) {
return mGroupInfo;
}
return nullptr;
}
AccGroupInfo* LocalAccessible::GetOrCreateGroupInfo() {
if (mGroupInfo) {
if (mStateFlags & eGroupInfoDirty) {
mGroupInfo->Update();
mStateFlags &= ~eGroupInfoDirty;
}
return mGroupInfo;
}
mGroupInfo = AccGroupInfo::CreateGroupInfo(this);
mStateFlags &= ~eGroupInfoDirty;
return mGroupInfo;
}
void LocalAccessible::SendCache(uint64_t aCacheDomain,
CacheUpdateType aUpdateType) {
if (!IPCAccessibilityActive() || !Document()) {
return;
}
// Only send cache updates for domains that are active.
const uint64_t domainsToSend =
nsAccessibilityService::GetActiveCacheDomains() & aCacheDomain;
// Avoid sending cache updates if we have no domains to update.
if (domainsToSend == CacheDomain::None) {
return;
}
DocAccessibleChild* ipcDoc = mDoc->IPCDoc();
if (!ipcDoc) {
// This means DocAccessible::DoInitialUpdate hasn't been called yet, which
// means the a11y tree hasn't been built yet. Therefore, this should only
// be possible if this is a DocAccessible.
MOZ_ASSERT(IsDoc(), "Called on a non-DocAccessible but IPCDoc is null");
return;
}
RefPtr<AccAttributes> fields =
BundleFieldsForCache(domainsToSend, aUpdateType);
if (!fields->Count()) {
return;
}
nsTArray<CacheData> data;
data.AppendElement(CacheData(ID(), fields));
ipcDoc->SendCache(aUpdateType, data);
if (profiler_thread_is_being_profiled_for_markers()) {
nsAutoCString updateTypeStr;
if (aUpdateType == CacheUpdateType::Initial) {
updateTypeStr = "Initial";
} else if (aUpdateType == CacheUpdateType::Update) {
updateTypeStr = "Update";
} else {
updateTypeStr = "Other";
}
PROFILER_MARKER_TEXT("LocalAccessible::SendCache", A11Y, {}, updateTypeStr);
}
}
already_AddRefed<AccAttributes> LocalAccessible::BundleFieldsForCache(
uint64_t aCacheDomain, CacheUpdateType aUpdateType,
uint64_t aInitialDomains) {
MOZ_ASSERT((~aCacheDomain & aInitialDomains) == CacheDomain::None,
"Initial domain pushes without domains requested!");
RefPtr<AccAttributes> fields = new AccAttributes();
if (aUpdateType == CacheUpdateType::Initial) {
aInitialDomains = CacheDomain::All;
}
// Pass a single cache domain in to query whether this is the initial push for
// this domain.
auto IsInitialPush = [aInitialDomains](uint64_t aCacheDomain) {
return (aCacheDomain & aInitialDomains) == aCacheDomain;
};
auto IsUpdatePush = [aInitialDomains](uint64_t aCacheDomain) {
return (aCacheDomain & aInitialDomains) == CacheDomain::None;
};
// Caching name for text leaf Accessibles is redundant, since their name is
// always their text. Text gets handled below.
if (aCacheDomain & CacheDomain::NameAndDescription && !IsText()) {
nsString name;
int32_t nameFlag = Name(name);
if (nameFlag != eNameOK) {
fields->SetAttribute(CacheKey::NameValueFlag, nameFlag);
} else if (IsUpdatePush(CacheDomain::NameAndDescription)) {
fields->SetAttribute(CacheKey::NameValueFlag, DeleteEntry());
}
if (IsTextField()) {
MOZ_ASSERT(mContent);
nsString placeholder;
// Only cache the placeholder separately if it isn't used as the name.
if (Elm()->GetAttr(nsGkAtoms::placeholder, placeholder) &&
name != placeholder) {
fields->SetAttribute(CacheKey::HTMLPlaceholder, std::move(placeholder));
} else if (IsUpdatePush(CacheDomain::NameAndDescription)) {
fields->SetAttribute(CacheKey::HTMLPlaceholder, DeleteEntry());
}
}
if (!name.IsEmpty()) {
fields->SetAttribute(CacheKey::Name, std::move(name));
} else if (IsUpdatePush(CacheDomain::NameAndDescription)) {
fields->SetAttribute(CacheKey::Name, DeleteEntry());
}
nsString description;
Description(description);
if (!description.IsEmpty()) {
fields->SetAttribute(CacheKey::Description, std::move(description));
} else if (IsUpdatePush(CacheDomain::NameAndDescription)) {
fields->SetAttribute(CacheKey::Description, DeleteEntry());
}
}
if (aCacheDomain & CacheDomain::Value) {
// We cache the text value in 3 cases:
// 1. Accessible is an HTML input type that holds a number.
// 2. Accessible has a numeric value and an aria-valuetext.
// 3. Accessible is an HTML input type that holds text.
// 4. Accessible is a link, in which case value is the target URL.
// ... for all other cases we divine the value remotely.
bool cacheValueText = false;
if (HasNumericValue()) {
fields->SetAttribute(CacheKey::NumericValue, CurValue());
fields->SetAttribute(CacheKey::MaxValue, MaxValue());
fields->SetAttribute(CacheKey::MinValue, MinValue());
fields->SetAttribute(CacheKey::Step, Step());
cacheValueText = NativeHasNumericValue() ||
(mContent->IsElement() &&
nsAccUtils::HasARIAAttr(mContent->AsElement(),
nsGkAtoms::aria_valuetext));
} else {
cacheValueText = IsTextField() || IsHTMLLink();
}
if (cacheValueText) {
nsString value;
Value(value);
if (!value.IsEmpty()) {
fields->SetAttribute(CacheKey::TextValue, std::move(value));
} else if (IsUpdatePush(CacheDomain::Value)) {
fields->SetAttribute(CacheKey::TextValue, DeleteEntry());
}
}
if (IsImage()) {
// Cache the src of images. This is used by some clients to help remediate
// inaccessible images.
MOZ_ASSERT(mContent, "Image must have mContent");
nsString src;
mContent->AsElement()->GetAttr(nsGkAtoms::src, src);
if (!src.IsEmpty()) {
fields->SetAttribute(CacheKey::SrcURL, std::move(src));
} else if (IsUpdatePush(CacheDomain::Value)) {
fields->SetAttribute(CacheKey::SrcURL, DeleteEntry());
}
}
if (TagName() == nsGkAtoms::meter) {
// We should only cache value region for HTML meter elements. A meter
// should always have a value region, so this attribute should never
// be empty (i.e. there is no DeleteEntry() clause here).
HTMLMeterAccessible* meter = static_cast<HTMLMeterAccessible*>(this);
fields->SetAttribute(CacheKey::ValueRegion, meter->ValueRegion());
}
}
if (aCacheDomain & CacheDomain::Viewport && IsDoc()) {
// Construct the viewport cache for this document. This cache domain will
// only be requested after we finish painting.
DocAccessible* doc = AsDoc();
PresShell* presShell = doc->PresShellPtr();
if (nsIFrame* rootFrame = presShell->GetRootFrame()) {
nsTArray<nsIFrame*> frames;
ScrollContainerFrame* sf = presShell->GetRootScrollContainerFrame();
nsRect scrollPort = sf ? sf->GetScrollPortRect() : rootFrame->GetRect();
nsLayoutUtils::GetFramesForArea(
RelativeTo{rootFrame}, scrollPort, frames,
{{// We don't add the ::OnlyVisible option here, because
// it means we always consider frames with pointer-events: none.
// See usage of HitTestIsForVisibility in nsDisplayList::HitTest.
// This flag ensures the display lists are built, even if
// the page hasn't finished loading.
nsLayoutUtils::FrameForPointOption::IgnorePaintSuppression,
// Each doc should have its own viewport cache, so we can
// ignore cross-doc content as an optimization.
nsLayoutUtils::FrameForPointOption::IgnoreCrossDoc}});
nsTHashSet<LocalAccessible*> inViewAccs;
nsTArray<uint64_t> viewportCache(frames.Length());
// Layout considers table rows fully occluded by their containing cells.
// This means they don't have their own display list items, and they won't
// show up in the list returned from GetFramesForArea. To prevent table
// rows from appearing offscreen, we manually add any rows for which we
// have on-screen cells.
LocalAccessible* prevParentRow = nullptr;
for (nsIFrame* frame : frames) {
nsIContent* content = frame->GetContent();
if (!content) {
continue;
}
LocalAccessible* acc = doc->GetAccessible(content);
// The document should always be present at the end of the list, so
// including it is unnecessary and wasteful. We skip the document here
// and handle it as a fallback when hit testing.
if (!acc || acc == mDoc) {
continue;
}
if (acc->IsTextLeaf() && nsAccUtils::MustPrune(acc->LocalParent())) {
acc = acc->LocalParent();
}
if (acc->IsTableCell()) {
LocalAccessible* parent = acc->LocalParent();
if (parent && parent->IsTableRow() && parent != prevParentRow) {
// If we've entered a new row since the last cell we saw, add the
// previous parent row to our viewport cache here to maintain
// hittesting order. Keep track of the current parent row.
if (prevParentRow && inViewAccs.EnsureInserted(prevParentRow)) {
viewportCache.AppendElement(prevParentRow->ID());
}
prevParentRow = parent;
}
} else if (acc->IsTable()) {
// If we've encountered a table, we know we've already
// handled all of this table's content (because we're traversing
// in hittesting order). Add our table's final row to the viewport
// cache before adding the table itself. Reset our marker for the next
// table.
if (prevParentRow && inViewAccs.EnsureInserted(prevParentRow)) {
viewportCache.AppendElement(prevParentRow->ID());
}
prevParentRow = nullptr;
} else if (acc->IsImageMap()) {
// Layout doesn't walk image maps, so we do that
// manually here. We do this before adding the map itself
// so the children come earlier in the hittesting order.
for (uint32_t i = 0; i < acc->ChildCount(); i++) {
LocalAccessible* child = acc->LocalChildAt(i);
MOZ_ASSERT(child);
if (inViewAccs.EnsureInserted(child)) {
MOZ_ASSERT(!child->IsDoc());
viewportCache.AppendElement(child->ID());
}
}
} else if (acc->IsHTMLCombobox()) {
// Layout doesn't consider combobox lists (or their
// currently selected items) to be onscreen, but we do.
// Add those things manually here.
HTMLComboboxAccessible* combobox =
static_cast<HTMLComboboxAccessible*>(acc);
HTMLComboboxListAccessible* list = combobox->List();
LocalAccessible* currItem = combobox->SelectedOption();
// Preserve hittesting order by adding the item, then
// the list, and finally the combobox itself.
if (currItem && inViewAccs.EnsureInserted(currItem)) {
viewportCache.AppendElement(currItem->ID());
}
if (list && inViewAccs.EnsureInserted(list)) {
viewportCache.AppendElement(list->ID());
}
}
if (inViewAccs.EnsureInserted(acc)) {
MOZ_ASSERT(!acc->IsDoc());
viewportCache.AppendElement(acc->ID());
}
}
if (viewportCache.Length()) {
fields->SetAttribute(CacheKey::Viewport, std::move(viewportCache));
}
}
}
if (aCacheDomain & CacheDomain::APZ && IsDoc()) {
PresShell* presShell = AsDoc()->PresShellPtr();
MOZ_ASSERT(presShell, "Can't get APZ factor for null presShell");
nsPoint viewportOffset =
presShell->GetVisualViewportOffsetRelativeToLayoutViewport();
if (viewportOffset.x || viewportOffset.y) {
nsTArray<int32_t> offsetArray(2);
offsetArray.AppendElement(viewportOffset.x);
offsetArray.AppendElement(viewportOffset.y);
fields->SetAttribute(CacheKey::VisualViewportOffset,
std::move(offsetArray));
} else if (IsUpdatePush(CacheDomain::APZ)) {
fields->SetAttribute(CacheKey::VisualViewportOffset, DeleteEntry());
}
}
bool boundsChanged = false;
nsIFrame* frame = GetFrame();
if (aCacheDomain & CacheDomain::Bounds) {
nsRect newBoundsRect = ParentRelativeBounds();
// 1. Layout might notify us of a possible bounds change when the bounds
// haven't really changed. Therefore, we cache the last bounds we sent
// and don't send an update if they haven't changed.
// 2. For an initial cache push, we ignore 1) and always send the bounds.
// This handles the case where this LocalAccessible was moved (but not
// re-created). In that case, we will have cached bounds, but we currently
// do an initial cache push.
MOZ_ASSERT(IsInitialPush(CacheDomain::Bounds) || mBounds.isSome(),
"Incremental cache push but mBounds is not set!");
if (OuterDocAccessible* doc = AsOuterDoc()) {
if (nsIFrame* docFrame = doc->GetFrame()) {
const nsMargin& newOffset = docFrame->GetUsedBorderAndPadding();
Maybe<nsMargin> currOffset = doc->GetCrossDocOffset();
if (!currOffset || *currOffset != newOffset) {
// OOP iframe docs can't compute their position within their
// cross-proc parent, so we have to manually cache that offset
// on the parent (outer doc) itself. For simplicity and consistency,
// we do this here for both OOP and in-process iframes. For in-process
// iframes, this also avoids the need to push a cache update for the
// embedded document when the iframe changes its padding, gets
// re-created, etc. Similar to bounds, we maintain a local cache and a
// remote cache to avoid sending redundant updates.
doc->SetCrossDocOffset(newOffset);
nsTArray<int32_t> offsetArray(2);
offsetArray.AppendElement(newOffset.Side(eSideLeft)); // X offset
offsetArray.AppendElement(newOffset.Side(eSideTop)); // Y offset
fields->SetAttribute(CacheKey::CrossDocOffset,
std::move(offsetArray));
}
}
}
// We null check mBounds here to avoid a crash while we figure out how this
// can happen.
boundsChanged = IsInitialPush(CacheDomain::Bounds) || !mBounds ||
!newBoundsRect.IsEqualEdges(mBounds.value());
if (boundsChanged) {
mBounds = Some(newBoundsRect);
nsTArray<int32_t> boundsArray(4);
boundsArray.AppendElement(newBoundsRect.x);
boundsArray.AppendElement(newBoundsRect.y);
boundsArray.AppendElement(newBoundsRect.width);
boundsArray.AppendElement(newBoundsRect.height);
fields->SetAttribute(CacheKey::ParentRelativeBounds,
std::move(boundsArray));
}
if (frame && frame->ScrollableOverflowRect().IsEmpty()) {
fields->SetAttribute(CacheKey::IsClipped, true);
} else if (IsUpdatePush(CacheDomain::Bounds)) {
fields->SetAttribute(CacheKey::IsClipped, DeleteEntry());
}
}
if (aCacheDomain & CacheDomain::Text) {
if (!HasChildren()) {
// We only cache text and line offsets on leaf Accessibles.
// Only text Accessibles can have actual text.
if (IsText()) {
nsString text;
AppendTextTo(text);
fields->SetAttribute(CacheKey::Text, std::move(text));
TextLeafPoint point(this, 0);
RefPtr<AccAttributes> attrs = point.GetTextAttributesLocalAcc(
/* aIncludeDefaults */ false);
fields->SetAttribute(CacheKey::TextAttributes, std::move(attrs));
}
}
if (HyperTextAccessible* ht = AsHyperText()) {
RefPtr<AccAttributes> attrs = ht->DefaultTextAttributes();
fields->SetAttribute(CacheKey::TextAttributes, std::move(attrs));
} else if (!IsText()) {
// Language is normally cached in text attributes, but Accessibles that
// aren't HyperText or Text (e.g. <img>, <input type="radio">) don't have
// text attributes. The Text domain isn't a great fit, but the kinds of
// clients (e.g. screen readers) that care about language are likely to
// care about text as well.
nsString language;
Language(language);
if (!language.IsEmpty()) {
fields->SetAttribute(CacheKey::Language, std::move(language));
} else if (IsUpdatePush(CacheDomain::Text)) {
fields->SetAttribute(CacheKey::Language, DeleteEntry());
}
}
}
// If text changes, we must also update text offset attributes.
if (aCacheDomain & (CacheDomain::TextOffsetAttributes | CacheDomain::Text) &&
IsTextLeaf()) {
auto offsetAttrs = TextLeafPoint::GetTextOffsetAttributes(this);
if (!offsetAttrs.IsEmpty()) {
fields->SetAttribute(CacheKey::TextOffsetAttributes,
std::move(offsetAttrs));
} else if (IsUpdatePush(CacheDomain::TextOffsetAttributes) ||
IsUpdatePush(CacheDomain::Text)) {
fields->SetAttribute(CacheKey::TextOffsetAttributes, DeleteEntry());
}
}
if (aCacheDomain & (CacheDomain::TextBounds) && !HasChildren()) {
// We cache line start offsets for both text and non-text leaf Accessibles
// because non-text leaf Accessibles can still start a line.
TextLeafPoint lineStart =
TextLeafPoint(this, 0).FindNextLineStartSameLocalAcc(
/* aIncludeOrigin */ true);
int32_t lineStartOffset = lineStart ? lineStart.mOffset : -1;
// We push line starts and text bounds in two cases:
// 1. TextBounds is pushed initially.
// 2. CacheDomain::Bounds was requested (indicating that the frame was
// reflowed) but the bounds didn't actually change. This can happen when
// the spanned text is non-rectangular. For example, an Accessible might
// cover two characters on one line and a single character on another line.
// An insertion in a previous text node might cause it to shift such that it
// now covers a single character on the first line and two characters on the
// second line. Its bounding rect will be the same both before and after the
// insertion. In this case, we use the first line start to determine whether
// there was a change. This should be safe because the text didn't change in
// this Accessible, so if the first line start doesn't shift, none of them
// should shift.
if (IsInitialPush(CacheDomain::TextBounds) ||
aCacheDomain & CacheDomain::Text || boundsChanged ||
mFirstLineStart != lineStartOffset) {
mFirstLineStart = lineStartOffset;
nsTArray<int32_t> lineStarts;
for (; lineStart;
lineStart = lineStart.FindNextLineStartSameLocalAcc(false)) {
lineStarts.AppendElement(lineStart.mOffset);
}
if (!lineStarts.IsEmpty()) {
fields->SetAttribute(CacheKey::TextLineStarts, std::move(lineStarts));
} else if (IsUpdatePush(CacheDomain::TextBounds)) {
fields->SetAttribute(CacheKey::TextLineStarts, DeleteEntry());
}
if (frame && frame->IsTextFrame()) {
if (nsTextFrame* currTextFrame = do_QueryFrame(frame)) {
nsTArray<int32_t> charData(nsAccUtils::TextLength(this) *
kNumbersInRect);
// Continuation offsets are calculated relative to the primary frame.
// However, the acc's bounds are calculated using
// GetAllInFlowRectsUnion. For wrapped text which starts part way
// through a line, this might mean the top left of the acc is
// different to the top left of the primary frame. This also happens
// when the primary frame is empty (e.g. a blank line at the start of
// pre-formatted text), since the union rect will exclude the origin
// in that case. Calculate the offset from the acc's rect to the
// primary frame's rect.
nsRect accOffset =
nsLayoutUtils::GetAllInFlowRectsUnion(frame, frame);
while (currTextFrame) {
nsPoint contOffset = currTextFrame->GetOffsetTo(frame);
contOffset -= accOffset.TopLeft();
int32_t length = currTextFrame->GetContentLength();
nsTArray<nsRect> charBounds(length);
currTextFrame->GetCharacterRectsInRange(
currTextFrame->GetContentOffset(), length, charBounds);
for (nsRect& charRect : charBounds) {
if (charRect.width == 0 &&
!currTextFrame->StyleText()->WhiteSpaceIsSignificant()) {
// GetCharacterRectsInRange gives us one rect per content
// offset. However, TextLeafAccessibles use rendered offsets;
// e.g. they might exclude some content white space. If we get
// a 0 width rect and it's white space, skip this rect, since
// this character isn't in the rendered text. We do have
// a way to convert between content and rendered offsets, but
// doing this for every character is expensive.
const char16_t contentChar = mContent->GetText()->CharAt(
charData.Length() / kNumbersInRect);
if (contentChar == u' ' || contentChar == u'\t' ||
contentChar == u'\n') {
continue;
}
}
// We expect each char rect to be relative to the text leaf
// acc this text lives in. Unfortunately, GetCharacterRectsInRange
// returns rects relative to their continuation. Add the
// continuation's relative position here to make our final
// rect relative to the text leaf acc.
charRect.MoveBy(contOffset);
charData.AppendElement(charRect.x);
charData.AppendElement(charRect.y);
charData.AppendElement(charRect.width);
charData.AppendElement(charRect.height);
}
currTextFrame = currTextFrame->GetNextContinuation();
}
if (charData.Length()) {
fields->SetAttribute(CacheKey::TextBounds, std::move(charData));
}
}
}
}
}
if (aCacheDomain & CacheDomain::TransformMatrix) {
bool transformed = false;
if (frame && frame->IsTransformed()) {
// This matrix is only valid when applied to CSSPixel points/rects
// in the coordinate space of `frame`.
gfx::Matrix4x4 mtx = nsDisplayTransform::GetResultingTransformMatrix(
frame, nsPoint(0, 0), AppUnitsPerCSSPixel(),
nsDisplayTransform::INCLUDE_PERSPECTIVE);
// We might get back the identity matrix. This can happen if there is no
// actual transform. For example, if an element has
// will-change: transform, nsIFrame::IsTransformed will return true, but
// this doesn't necessarily mean there is a transform right now.
// Applying the identity matrix is effectively a no-op, so there's no
// point caching it.
transformed = !mtx.IsIdentity();
if (transformed) {
UniquePtr<gfx::Matrix4x4> ptr = MakeUnique<gfx::Matrix4x4>(mtx);
fields->SetAttribute(CacheKey::TransformMatrix, std::move(ptr));
}
}
if (!transformed && IsUpdatePush(CacheDomain::TransformMatrix)) {
// Otherwise, if we're bundling a transform update but this
// frame isn't transformed (or doesn't exist), we need
// to send a DeleteEntry() to remove any
// transform that was previously cached for this frame.
fields->SetAttribute(CacheKey::TransformMatrix, DeleteEntry());
}
}
if (aCacheDomain & CacheDomain::ScrollPosition && frame) {
const auto [scrollPosition, scrollRange] = mDoc->ComputeScrollData(this);
if (scrollRange.width || scrollRange.height) {
// If the scroll range is 0 by 0, this acc is not scrollable. We
// can't simply check scrollPosition != 0, since it's valid for scrollable
// frames to have a (0, 0) position. We also can't check IsEmpty or
// ZeroArea because frames with only one scrollable dimension will return
// a height/width of zero for the non-scrollable dimension, yielding zero
// area even if the width/height for the scrollable dimension is nonzero.
// We also cache (0, 0) for accs with overflow:auto or overflow:scroll,
// even if the content is not currently large enough to be scrollable
// right now -- these accs have a non-zero scroll range.
nsTArray<int32_t> positionArr(2);
positionArr.AppendElement(scrollPosition.x);
positionArr.AppendElement(scrollPosition.y);
fields->SetAttribute(CacheKey::ScrollPosition, std::move(positionArr));
} else if (IsUpdatePush(CacheDomain::ScrollPosition)) {
fields->SetAttribute(CacheKey::ScrollPosition, DeleteEntry());
}
}
if (aCacheDomain & CacheDomain::DOMNodeIDAndClass && mContent) {
nsAtom* id = mContent->GetID();
if (id) {
fields->SetAttribute(CacheKey::DOMNodeID, id);
} else if (IsUpdatePush(CacheDomain::DOMNodeIDAndClass)) {
fields->SetAttribute(CacheKey::DOMNodeID, DeleteEntry());
}
nsString className;
DOMNodeClass(className);
if (!className.IsEmpty()) {
fields->SetAttribute(CacheKey::DOMNodeClass, std::move(className));
} else if (IsUpdatePush(CacheDomain::DOMNodeIDAndClass)) {
fields->SetAttribute(CacheKey::DOMNodeClass, DeleteEntry());
}
}
// State is only included in the initial push. Thereafter, cached state is
// updated via events.
if (aCacheDomain & CacheDomain::State) {
if (IsInitialPush(CacheDomain::State)) {
// Most states are updated using state change events, so we only send
// these for the initial cache push.
uint64_t state = State();
// Exclude states which must be calculated by RemoteAccessible.
state &= ~kRemoteCalculatedStates;
fields->SetAttribute(CacheKey::State, state);
}
// If aria-selected isn't specified, there may be no SELECTED state.
// However, aria-selected can be implicit in some cases when an item is
// focused. We don't want to do this if aria-selected is explicitly
// set to "false", so we need to differentiate between false and unset.
if (auto ariaSelected = ARIASelected()) {
fields->SetAttribute(CacheKey::ARIASelected, *ariaSelected);
} else if (IsUpdatePush(CacheDomain::State)) {
fields->SetAttribute(CacheKey::ARIASelected, DeleteEntry()); // Unset.
}
}
if (aCacheDomain & CacheDomain::GroupInfo && mContent) {
for (nsAtom* attr : {nsGkAtoms::aria_level, nsGkAtoms::aria_setsize,
nsGkAtoms::aria_posinset}) {
int32_t value = 0;
if (nsCoreUtils::GetUIntAttr(mContent, attr, &value)) {
fields->SetAttribute(attr, value);
} else if (IsUpdatePush(CacheDomain::GroupInfo)) {
fields->SetAttribute(attr, DeleteEntry());
}
}
}
if (aCacheDomain & CacheDomain::Actions) {
if (HasPrimaryAction()) {
// Here we cache the primary action.
nsAutoString actionName;
ActionNameAt(0, actionName);
RefPtr<nsAtom> actionAtom = NS_Atomize(actionName);
fields->SetAttribute(CacheKey::PrimaryAction, actionAtom);
} else if (IsUpdatePush(CacheDomain::Actions)) {
fields->SetAttribute(CacheKey::PrimaryAction, DeleteEntry());
}
if (ImageAccessible* imgAcc = AsImage()) {
// Here we cache the showlongdesc action.
if (imgAcc->HasLongDesc()) {
fields->SetAttribute(CacheKey::HasLongdesc, true);
} else if (IsUpdatePush(CacheDomain::Actions)) {
fields->SetAttribute(CacheKey::HasLongdesc, DeleteEntry());
}
}
KeyBinding accessKey = AccessKey();
if (!accessKey.IsEmpty()) {
fields->SetAttribute(CacheKey::AccessKey, accessKey.Serialize());
} else if (IsUpdatePush(CacheDomain::Actions)) {
fields->SetAttribute(CacheKey::AccessKey, DeleteEntry());
}
}
if (aCacheDomain & CacheDomain::Style) {
if (RefPtr<nsAtom> display = DisplayStyle()) {
fields->SetAttribute(CacheKey::CSSDisplay, display);
}
float opacity = Opacity();
if (opacity != 1.0f) {
fields->SetAttribute(CacheKey::Opacity, opacity);
} else if (IsUpdatePush(CacheDomain::Style)) {
fields->SetAttribute(CacheKey::Opacity, DeleteEntry());
}
if (frame &&
frame->StyleDisplay()->mPosition == StylePositionProperty::Fixed &&
nsLayoutUtils::IsReallyFixedPos(frame)) {
fields->SetAttribute(CacheKey::CssPosition, nsGkAtoms::fixed);
} else if (IsUpdatePush(CacheDomain::Style)) {
fields->SetAttribute(CacheKey::CssPosition, DeleteEntry());
}
if (frame) {
nsAutoCString overflow;
frame->Style()->GetComputedPropertyValue(eCSSProperty_overflow, overflow);
RefPtr<nsAtom> overflowAtom = NS_Atomize(overflow);
if (overflowAtom == nsGkAtoms::hidden) {
fields->SetAttribute(CacheKey::CSSOverflow, nsGkAtoms::hidden);
} else if (IsUpdatePush(CacheDomain::Style)) {
fields->SetAttribute(CacheKey::CSSOverflow, DeleteEntry());
}
}
}
if (aCacheDomain & CacheDomain::Table) {
if (auto* table = HTMLTableAccessible::GetFrom(this)) {
if (table->IsProbablyLayoutTable()) {
fields->SetAttribute(CacheKey::TableLayoutGuess, true);
} else if (IsUpdatePush(CacheDomain::Table)) {
fields->SetAttribute(CacheKey::TableLayoutGuess, DeleteEntry());
}
} else if (auto* cell = HTMLTableCellAccessible::GetFrom(this)) {
// For HTML table cells, we must use the HTMLTableCellAccessible
// GetRow/ColExtent methods rather than using the DOM attributes directly.
// This is because of things like rowspan="0" which depend on knowing
// about thead, tbody, etc., which is info we don't have in the a11y tree.
int32_t value = static_cast<int32_t>(cell->RowExtent());
MOZ_ASSERT(value > 0);
if (value > 1) {
fields->SetAttribute(CacheKey::RowSpan, value);
} else if (IsUpdatePush(CacheDomain::Table)) {
fields->SetAttribute(CacheKey::RowSpan, DeleteEntry());
}
value = static_cast<int32_t>(cell->ColExtent());
MOZ_ASSERT(value > 0);
if (value > 1) {
fields->SetAttribute(CacheKey::ColSpan, value);
} else if (IsUpdatePush(CacheDomain::Table)) {
fields->SetAttribute(CacheKey::ColSpan, DeleteEntry());
}
if (mContent->AsElement()->HasAttr(nsGkAtoms::headers)) {
nsTArray<uint64_t> headers;
AssociatedElementsIterator iter(mDoc, mContent, nsGkAtoms::headers);
while (LocalAccessible* cell = iter.Next()) {
if (cell->IsTableCell()) {
headers.AppendElement(cell->ID());
}
}
fields->SetAttribute(CacheKey::CellHeaders, std::move(headers));
} else if (IsUpdatePush(CacheDomain::Table)) {
fields->SetAttribute(CacheKey::CellHeaders, DeleteEntry());
}
}
}
if (aCacheDomain & CacheDomain::ARIA && mContent && mContent->IsElement()) {
// We use a nested AccAttributes to make cache updates simpler. Rather than
// managing individual removals, we just replace or remove the entire set of
// ARIA attributes.
RefPtr<AccAttributes> ariaAttrs;
aria::AttrIterator attrIt(mContent);
while (attrIt.Next()) {
if (!ariaAttrs) {
ariaAttrs = new AccAttributes();
}
attrIt.ExposeAttr(ariaAttrs);
}
if (ariaAttrs) {
fields->SetAttribute(CacheKey::ARIAAttributes, std::move(ariaAttrs));
} else if (IsUpdatePush(CacheDomain::ARIA)) {
fields->SetAttribute(CacheKey::ARIAAttributes, DeleteEntry());
}
}
if (aCacheDomain & CacheDomain::Relations && mContent) {
if (IsHTMLRadioButton() ||
(mContent->IsElement() &&
mContent->AsElement()->IsHTMLElement(nsGkAtoms::a))) {
// HTML radio buttons with the same name should be grouped
// and returned together when their MEMBER_OF relation is
// requested. Computing LINKS_TO also requires we cache `name` on
// anchor elements.
nsString name;
mContent->AsElement()->GetAttr(nsGkAtoms::name, name);
if (!name.IsEmpty()) {
fields->SetAttribute(CacheKey::DOMName, std::move(name));
} else if (IsUpdatePush(CacheDomain::Relations)) {
// It's possible we used to have a name and it's since been
// removed. Send a delete entry.
fields->SetAttribute(CacheKey::DOMName, DeleteEntry());
}
}
for (auto const& data : kRelationTypeAtoms) {
nsTArray<uint64_t> ids;
nsStaticAtom* const relAtom = data.mAtom;
Relation rel;
if (data.mType == RelationType::LABEL_FOR) {
// Labels are a special case -- we need to validate that the target of
// their `for` attribute is in fact labelable. DOM checks this when we
// call GetControl(). If a label contains an element we will return it
// here.
if (dom::HTMLLabelElement* labelEl =
dom::HTMLLabelElement::FromNode(mContent)) {
rel.AppendTarget(mDoc, labelEl->GetControl());
}
} else if (data.mType == RelationType::DETAILS) {
// We need to use RelationByType for details because it might include
// popovertarget. Nothing exposes an implicit reverse details
// relation, so using RelationByType here is fine.
rel = RelationByType(RelationType::DETAILS);
} else {
// We use an AssociatedElementsIterator here instead of calling
// RelationByType directly because we only want to cache explicit
// relations. Implicit relations (e.g. LABEL_FOR exposed on the target
// of aria-labelledby) will be computed and stored separately in the
// parent process.
rel.AppendIter(new AssociatedElementsIterator(mDoc, mContent, relAtom));
}
while (LocalAccessible* acc = rel.LocalNext()) {
ids.AppendElement(acc->ID());
}
if (ids.Length()) {
fields->SetAttribute(relAtom, std::move(ids));
} else if (IsUpdatePush(CacheDomain::Relations)) {
fields->SetAttribute(relAtom, DeleteEntry());
}
}
}
#if defined(XP_WIN)
if (aCacheDomain & CacheDomain::InnerHTML && HasOwnContent() &&
mContent->IsMathMLElement(nsGkAtoms::math)) {
nsString innerHTML;
mContent->AsElement()->GetInnerHTML(innerHTML, IgnoreErrors());
fields->SetAttribute(CacheKey::InnerHTML, std::move(innerHTML));
}
#endif // defined(XP_WIN)
if (aUpdateType == CacheUpdateType::Initial) {
// Add fields which never change and thus only need to be included in the
// initial cache push.
if (mContent && mContent->IsElement()) {
fields->SetAttribute(CacheKey::TagName, mContent->NodeInfo()->NameAtom());
dom::Element* el = mContent->AsElement();
if (IsTextField() || IsDateTimeField()) {
// Cache text input types. Accessible is recreated if this changes,
// so it is considered immutable.
if (const nsAttrValue* attr = el->GetParsedAttr(nsGkAtoms::type)) {
RefPtr<nsAtom> inputType = attr->GetAsAtom();
if (inputType) {
fields->SetAttribute(CacheKey::InputType, inputType);
}
}
}
// Changing the role attribute currently re-creates the Accessible, so
// it's immutable in the cache.
if (const nsRoleMapEntry* roleMap = ARIARoleMap()) {
// Most of the time, the role attribute is a single, known role. We
// already send the map index, so we don't need to double up.
if (!nsAccUtils::ARIAAttrValueIs(el, nsGkAtoms::role, roleMap->roleAtom,
eIgnoreCase)) {
// Multiple roles or unknown roles are rare, so just send them as a
// string.
nsAutoString role;
nsAccUtils::GetARIAAttr(el, nsGkAtoms::role, role);
fields->SetAttribute(CacheKey::ARIARole, std::move(role));
}
}
if (auto* htmlEl = nsGenericHTMLElement::FromNode(mContent)) {
// Changing popover recreates the Accessible, so it's immutable in the
// cache.
nsAutoString popover;
htmlEl->GetPopover(popover);
if (!popover.IsEmpty()) {
fields->SetAttribute(CacheKey::PopupType,
RefPtr{NS_Atomize(popover)});
}
}
}
if (frame) {
// Note our frame's current computed style so we can track style changes
// later on.
mOldComputedStyle = frame->Style();
if (frame->IsTransformed()) {
mStateFlags |= eOldFrameHasValidTransformStyle;
} else {
mStateFlags &= ~eOldFrameHasValidTransformStyle;
}
}
if (IsDoc()) {
if (PresShell* presShell = AsDoc()->PresShellPtr()) {
// Send the initial resolution of the document. When this changes, we
// will ne notified via nsAS::NotifyOfResolutionChange
float resolution = presShell->GetResolution();
fields->SetAttribute(CacheKey::Resolution, resolution);
int32_t appUnitsPerDevPixel =
presShell->GetPresContext()->AppUnitsPerDevPixel();
fields->SetAttribute(CacheKey::AppUnitsPerDevPixel,
appUnitsPerDevPixel);
}
nsString mimeType;
AsDoc()->MimeType(mimeType);
fields->SetAttribute(CacheKey::MimeType, std::move(mimeType));
}
}
if ((aCacheDomain & (CacheDomain::Text | CacheDomain::ScrollPosition) ||
boundsChanged) &&
mDoc) {
mDoc->SetViewportCacheDirty(true);
}
return fields.forget();
}
void LocalAccessible::MaybeQueueCacheUpdateForStyleChanges() {
// mOldComputedStyle might be null if the initial cache hasn't been sent yet.
// In that case, there is nothing to do here.
if (!IPCAccessibilityActive() || !mOldComputedStyle) {
return;
}
if (nsIFrame* frame = GetFrame()) {
const ComputedStyle* newStyle = frame->Style();
nsAutoCString oldOverflow, newOverflow;
mOldComputedStyle->GetComputedPropertyValue(eCSSProperty_overflow,
oldOverflow);
newStyle->GetComputedPropertyValue(eCSSProperty_overflow, newOverflow);
if (oldOverflow != newOverflow) {
if (oldOverflow.Equals("hidden"_ns) || newOverflow.Equals("hidden"_ns)) {
mDoc->QueueCacheUpdate(this, CacheDomain::Style);
}
if (oldOverflow.Equals("auto"_ns) || newOverflow.Equals("auto"_ns) ||
oldOverflow.Equals("scroll"_ns) || newOverflow.Equals("scroll"_ns)) {
// We cache a (0,0) scroll position for frames that have overflow
// styling which means they _could_ become scrollable, even if the
// content within them doesn't currently scroll.
mDoc->QueueCacheUpdate(this, CacheDomain::ScrollPosition);
}
}
nsAutoCString oldDisplay, newDisplay;
mOldComputedStyle->GetComputedPropertyValue(eCSSProperty_display,
oldDisplay);
newStyle->GetComputedPropertyValue(eCSSProperty_display, newDisplay);
nsAutoCString oldOpacity, newOpacity;
mOldComputedStyle->GetComputedPropertyValue(eCSSProperty_opacity,
oldOpacity);
newStyle->GetComputedPropertyValue(eCSSProperty_opacity, newOpacity);
if (oldDisplay != newDisplay || oldOpacity != newOpacity) {
// CacheDomain::Style covers both display and opacity, so if
// either property has changed, send an update for the entire domain.
mDoc->QueueCacheUpdate(this, CacheDomain::Style);
}
nsAutoCString oldPosition, newPosition;
mOldComputedStyle->GetComputedPropertyValue(eCSSProperty_position,
oldPosition);
newStyle->GetComputedPropertyValue(eCSSProperty_position, newPosition);
if (oldPosition != newPosition) {
RefPtr<nsAtom> oldAtom = NS_Atomize(oldPosition);
RefPtr<nsAtom> newAtom = NS_Atomize(newPosition);
if (oldAtom == nsGkAtoms::fixed || newAtom == nsGkAtoms::fixed) {
mDoc->QueueCacheUpdate(this, CacheDomain::Style);
}
}
bool newHasValidTransformStyle =
newStyle->StyleDisplay()->HasTransform(frame);
bool oldHasValidTransformStyle =
(mStateFlags & eOldFrameHasValidTransformStyle) != 0;
// We should send a transform update if we're adding or
// removing transform styling altogether.
bool sendTransformUpdate =
newHasValidTransformStyle || oldHasValidTransformStyle;
if (newHasValidTransformStyle && oldHasValidTransformStyle) {
// If we continue to have transform styling, verify
// our transform has actually changed.
nsChangeHint transformHint =
newStyle->StyleDisplay()->CalcTransformPropertyDifference(
*mOldComputedStyle->StyleDisplay());
// If this hint exists, it implies we found a property difference
sendTransformUpdate = !!transformHint;
}
if (sendTransformUpdate) {
// If our transform matrix has changed, it's possible our
// viewport cache has also changed.
mDoc->SetViewportCacheDirty(true);
// Queuing a cache update for the TransformMatrix domain doesn't
// necessarily mean we'll send the matrix itself, we may
// send a DeleteEntry() instead. See BundleFieldsForCache for
// more information.
mDoc->QueueCacheUpdate(this, CacheDomain::TransformMatrix);
}
mOldComputedStyle = newStyle;
if (newHasValidTransformStyle) {
mStateFlags |= eOldFrameHasValidTransformStyle;
} else {
mStateFlags &= ~eOldFrameHasValidTransformStyle;
}
}
}
nsAtom* LocalAccessible::TagName() const {
return mContent && mContent->IsElement() ? mContent->NodeInfo()->NameAtom()
: nullptr;
}
already_AddRefed<nsAtom> LocalAccessible::InputType() const {
if (!IsTextField() && !IsDateTimeField()) {
return nullptr;
}
dom::Element* el = mContent->AsElement();
if (const nsAttrValue* attr = el->GetParsedAttr(nsGkAtoms::type)) {
RefPtr<nsAtom> inputType = attr->GetAsAtom();
return inputType.forget();
}
return nullptr;
}
already_AddRefed<nsAtom> LocalAccessible::DisplayStyle() const {
dom::Element* elm = Elm();
if (!elm) {
return nullptr;
}
if (elm->IsHTMLElement(nsGkAtoms::area)) {
// This is an image map area. CSS is irrelevant here.
return nullptr;
}
static const dom::Element::AttrValuesArray presentationRoles[] = {
nsGkAtoms::none, nsGkAtoms::presentation, nullptr};
if (nsAccUtils::FindARIAAttrValueIn(elm, nsGkAtoms::role, presentationRoles,
eIgnoreCase) != AttrArray::ATTR_MISSING &&
IsGeneric()) {
// This Accessible has been marked presentational, but we forced a generic
// Accessible for some reason; e.g. CSS transform. Don't expose display in
// this case, as the author might be explicitly trying to avoid said
// exposure.
return nullptr;
}
RefPtr<const ComputedStyle> style =
nsComputedDOMStyle::GetComputedStyleNoFlush(elm);
if (!style) {
// The element is not styled, maybe not in the flat tree?
return nullptr;
}
nsAutoCString value;
style->GetComputedPropertyValue(eCSSProperty_display, value);
return NS_Atomize(value);
}
float LocalAccessible::Opacity() const {
if (nsIFrame* frame = GetFrame()) {
return frame->StyleEffects()->mOpacity;
}
return 1.0f;
}
void LocalAccessible::DOMNodeID(nsString& aID) const {
aID.Truncate();
if (mContent) {
if (nsAtom* id = mContent->GetID()) {
id->ToString(aID);
}
}
}
void LocalAccessible::DOMNodeClass(nsString& aClass) const {
aClass.Truncate();
if (auto* el = dom::Element::FromNodeOrNull(mContent)) {
el->GetClassName(aClass);
}
}
void LocalAccessible::LiveRegionAttributes(nsAString* aLive,
nsAString* aRelevant,
Maybe<bool>* aAtomic,
nsAString* aBusy) const {
dom::Element* el = Elm();
if (!el) {
return;
}
if (aLive) {
nsAccUtils::GetARIAAttr(el, nsGkAtoms::aria_live, *aLive);
}
if (aRelevant) {
nsAccUtils::GetARIAAttr(el, nsGkAtoms::aria_relevant, *aRelevant);
}
if (aAtomic) {
// XXX We ignore aria-atomic="false", but this probably doesn't conform to
// the spec.
if (nsAccUtils::ARIAAttrValueIs(el, nsGkAtoms::aria_atomic,
nsGkAtoms::_true, eCaseMatters)) {
*aAtomic = Some(true);
}
}
if (aBusy) {
nsAccUtils::GetARIAAttr(el, nsGkAtoms::aria_busy, *aBusy);
}
}
Maybe<bool> LocalAccessible::ARIASelected() const {
if (dom::Element* el = Elm()) {
nsStaticAtom* atom =
nsAccUtils::NormalizeARIAToken(el, nsGkAtoms::aria_selected);
if (atom == nsGkAtoms::_true) {
return Some(true);
}
if (atom == nsGkAtoms::_false) {
return Some(false);
}
}
return Nothing();
}
void LocalAccessible::StaticAsserts() const {
static_assert(
eLastStateFlag <= (1 << kStateFlagsBits) - 1,
"LocalAccessible::mStateFlags was oversized by eLastStateFlag!");
static_assert(
eLastContextFlag <= (1 << kContextFlagsBits) - 1,
"LocalAccessible::mContextFlags was oversized by eLastContextFlag!");
}
TableAccessible* LocalAccessible::AsTable() {
if (IsTable() && !mContent->IsXULElement()) {
return CachedTableAccessible::GetFrom(this);
}
return nullptr;
}
TableCellAccessible* LocalAccessible::AsTableCell() {
if (IsTableCell() && !mContent->IsXULElement()) {
return CachedTableCellAccessible::GetFrom(this);
}
return nullptr;
}
Maybe<int32_t> LocalAccessible::GetIntARIAAttr(nsAtom* aAttrName) const {
if (mContent) {
int32_t val;
if (nsCoreUtils::GetUIntAttr(mContent, aAttrName, &val)) {
return Some(val);
}
// XXX Handle attributes that allow -1; e.g. aria-row/colcount.
}
return Nothing();
}