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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "Event.h"
#include "AccessCheck.h"
#include "base/basictypes.h"
#include "ipc/IPCMessageUtils.h"
#include "ipc/IPCMessageUtilsSpecializations.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/ContentEvents.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/InternalMutationEvent.h"
#include "mozilla/dom/Performance.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/MiscEvents.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/PointerLockManager.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/ViewportUtils.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentInlines.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/WorkerScope.h"
#include "mozilla/ScrollContainerFrame.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/SVGUtils.h"
#include "mozilla/SVGOuterSVGFrame.h"
#include "nsContentUtils.h"
#include "nsCOMPtr.h"
#include "nsDeviceContext.h"
#include "nsError.h"
#include "nsGlobalWindowInner.h"
#include "nsIFrame.h"
#include "nsIContent.h"
#include "nsIContentInlines.h"
#include "nsJSEnvironment.h"
#include "nsLayoutUtils.h"
#include "nsPIWindowRoot.h"
#include "nsRFPService.h"
namespace mozilla::dom {
Event::Event(EventTarget* aOwner, nsPresContext* aPresContext,
WidgetEvent* aEvent) {
ConstructorInit(aOwner, aPresContext, aEvent);
}
Event::Event(nsPIDOMWindowInner* aParent) {
ConstructorInit(nsGlobalWindowInner::Cast(aParent), nullptr, nullptr);
}
void Event::ConstructorInit(EventTarget* aOwner, nsPresContext* aPresContext,
WidgetEvent* aEvent) {
SetOwner(aOwner);
mIsMainThreadEvent = NS_IsMainThread();
if (mIsMainThreadEvent) {
mRefCnt.SetIsOnMainThread();
}
mPrivateDataDuplicated = false;
mWantsPopupControlCheck = false;
if (aEvent) {
mEvent = aEvent;
mEventIsInternal = false;
} else {
mEventIsInternal = true;
/*
A derived class might want to allocate its own type of aEvent
(derived from WidgetEvent). To do this, it should take care to pass
a non-nullptr aEvent to this ctor, e.g.:
FooEvent::FooEvent(..., WidgetEvent* aEvent)
: Event(..., aEvent ? aEvent : new WidgetEvent())
Then, to override the mEventIsInternal assignments done by the
base ctor, it should do this in its own ctor:
FooEvent::FooEvent(..., WidgetEvent* aEvent)
...
{
...
if (aEvent) {
mEventIsInternal = false;
}
else {
mEventIsInternal = true;
}
...
}
*/
mEvent = new WidgetEvent(false, eVoidEvent);
}
InitPresContextData(aPresContext);
}
void Event::InitPresContextData(nsPresContext* aPresContext) {
mPresContext = aPresContext;
// Get the explicit original target (if it's anonymous make it null)
{
nsCOMPtr<nsIContent> content = GetTargetFromFrame();
if (content && !content->IsInNativeAnonymousSubtree()) {
mExplicitOriginalTarget = std::move(content);
} else {
mExplicitOriginalTarget = nullptr;
}
}
}
Event::~Event() {
NS_ASSERT_OWNINGTHREAD(Event);
if (mEventIsInternal && mEvent) {
delete mEvent;
}
}
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Event)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_ENTRY(Event)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(Event)
NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(Event, LastRelease())
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(Event)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Event)
if (tmp->mEventIsInternal) {
tmp->mEvent->mTarget = nullptr;
tmp->mEvent->mCurrentTarget = nullptr;
tmp->mEvent->mOriginalTarget = nullptr;
tmp->mEvent->mRelatedTarget = nullptr;
tmp->mEvent->mOriginalRelatedTarget = nullptr;
switch (tmp->mEvent->mClass) {
case eDragEventClass: {
WidgetDragEvent* dragEvent = tmp->mEvent->AsDragEvent();
dragEvent->mDataTransfer = nullptr;
break;
}
case eClipboardEventClass:
tmp->mEvent->AsClipboardEvent()->mClipboardData = nullptr;
break;
case eEditorInputEventClass: {
InternalEditorInputEvent* inputEvent =
tmp->mEvent->AsEditorInputEvent();
inputEvent->mDataTransfer = nullptr;
inputEvent->mTargetRanges.Clear();
break;
}
case eMutationEventClass:
tmp->mEvent->AsMutationEvent()->mRelatedNode = nullptr;
break;
default:
break;
}
if (WidgetMouseEvent* mouseEvent = tmp->mEvent->AsMouseEvent()) {
mouseEvent->mClickTarget = nullptr;
}
}
NS_IMPL_CYCLE_COLLECTION_UNLINK(mPresContext);
NS_IMPL_CYCLE_COLLECTION_UNLINK(mExplicitOriginalTarget);
NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner);
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Event)
if (tmp->mEventIsInternal) {
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEvent->mTarget)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEvent->mCurrentTarget)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEvent->mOriginalTarget)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEvent->mRelatedTarget)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEvent->mOriginalRelatedTarget);
switch (tmp->mEvent->mClass) {
case eDragEventClass: {
WidgetDragEvent* dragEvent = tmp->mEvent->AsDragEvent();
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->mDataTransfer");
cb.NoteXPCOMChild(dragEvent->mDataTransfer);
break;
}
case eClipboardEventClass:
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->mClipboardData");
cb.NoteXPCOMChild(tmp->mEvent->AsClipboardEvent()->mClipboardData);
break;
case eEditorInputEventClass:
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->mDataTransfer");
cb.NoteXPCOMChild(tmp->mEvent->AsEditorInputEvent()->mDataTransfer);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(
mEvent->AsEditorInputEvent()->mTargetRanges);
break;
case eMutationEventClass:
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->mRelatedNode");
cb.NoteXPCOMChild(tmp->mEvent->AsMutationEvent()->mRelatedNode);
break;
default:
break;
}
if (WidgetMouseEvent* mouseEvent = tmp->mEvent->AsMouseEvent()) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->mClickTarget");
cb.NoteXPCOMChild(mouseEvent->mClickTarget);
}
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPresContext)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mExplicitOriginalTarget)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
void Event::LastRelease() {
nsISupports* supports = nullptr;
QueryInterface(NS_GET_IID(nsCycleCollectionISupports),
reinterpret_cast<void**>(&supports));
nsXPCOMCycleCollectionParticipant* p = nullptr;
CallQueryInterface(this, &p);
p->Unlink(supports);
}
JSObject* Event::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
return WrapObjectInternal(aCx, aGivenProto);
}
JSObject* Event::WrapObjectInternal(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return Event_Binding::Wrap(aCx, this, aGivenProto);
}
void Event::GetType(nsAString& aType) const {
GetWidgetEventType(mEvent, aType);
}
EventTarget* Event::GetTarget() const { return mEvent->GetDOMEventTarget(); }
already_AddRefed<Document> Event::GetDocument() const {
nsCOMPtr<EventTarget> eventTarget = GetTarget();
if (!eventTarget) {
return nullptr;
}
nsIGlobalObject* global = eventTarget->GetOwnerGlobal();
if (!global) {
return nullptr;
}
nsPIDOMWindowInner* win = global->GetAsInnerWindow();
if (!win) {
return nullptr;
}
nsCOMPtr<Document> doc;
doc = win->GetExtantDoc();
return doc.forget();
}
EventTarget* Event::GetCurrentTarget() const {
return mEvent->GetCurrentDOMEventTarget();
}
void Event::ComposedPath(nsTArray<RefPtr<EventTarget>>& aPath) {
EventDispatcher::GetComposedPathFor(mEvent, aPath);
}
//
// Get the actual event target node (may have been retargeted for mouse events)
//
already_AddRefed<nsIContent> Event::GetTargetFromFrame() {
if (!mPresContext) {
return nullptr;
}
// Get the mTarget frame (have to get the ESM first)
nsIFrame* targetFrame = mPresContext->EventStateManager()->GetEventTarget();
if (!targetFrame) {
return nullptr;
}
// get the real content
nsCOMPtr<nsIContent> realEventContent;
targetFrame->GetContentForEvent(mEvent, getter_AddRefs(realEventContent));
return realEventContent.forget();
}
EventTarget* Event::GetExplicitOriginalTarget() const {
if (mExplicitOriginalTarget) {
return mExplicitOriginalTarget;
}
return GetTarget();
}
EventTarget* Event::GetOriginalTarget() const {
return mEvent->GetOriginalDOMEventTarget();
}
EventTarget* Event::GetComposedTarget() const {
EventTarget* et = GetOriginalTarget();
nsIContent* content = nsIContent::FromEventTargetOrNull(et);
if (!content) {
return et;
}
nsIContent* nonChrome = content->FindFirstNonChromeOnlyAccessContent();
return nonChrome ? static_cast<EventTarget*>(nonChrome)
: static_cast<EventTarget*>(content->GetComposedDoc());
}
void Event::SetTrusted(bool aTrusted) { mEvent->mFlags.mIsTrusted = aTrusted; }
bool Event::ShouldIgnoreChromeEventTargetListener() const {
MOZ_ASSERT(NS_IsMainThread());
if (!XRE_IsParentProcess()) {
return false;
}
if (EventTarget* currentTarget = GetCurrentTarget();
NS_WARN_IF(!currentTarget) || !currentTarget->IsRootWindow()) {
return false;
}
EventTarget* et = GetOriginalTarget();
if (NS_WARN_IF(!et)) {
return false;
}
nsIGlobalObject* global = et->GetOwnerGlobal();
if (NS_WARN_IF(!global)) {
return false;
}
nsPIDOMWindowInner* win = global->GetAsInnerWindow();
if (NS_WARN_IF(!win)) {
return false;
}
BrowsingContext* bc = win->GetBrowsingContext();
if (NS_WARN_IF(!bc)) {
return false;
}
// If this is a content event on an nsWindowRoot, then we also handle this in
// InProcessBrowserChildMessageManager, so we can ignore this event.
return bc->IsContent();
}
bool Event::Init(mozilla::dom::EventTarget* aGlobal) {
if (!mIsMainThreadEvent) {
return IsCurrentThreadRunningChromeWorker();
}
bool trusted = false;
if (aGlobal) {
if (nsPIDOMWindowInner* w = aGlobal->GetAsInnerWindow()) {
if (Document* d = w->GetExtantDoc()) {
trusted = nsContentUtils::IsChromeDoc(d);
if (nsPresContext* presContext = d->GetPresContext()) {
InitPresContextData(presContext);
}
}
}
}
return trusted;
}
// static
already_AddRefed<Event> Event::Constructor(const GlobalObject& aGlobal,
const nsAString& aType,
const EventInit& aParam) {
nsCOMPtr<mozilla::dom::EventTarget> t =
do_QueryInterface(aGlobal.GetAsSupports());
return Constructor(t, aType, aParam);
}
// static
already_AddRefed<Event> Event::Constructor(EventTarget* aEventTarget,
const nsAString& aType,
const EventInit& aParam) {
RefPtr<Event> e = new Event(aEventTarget, nullptr, nullptr);
bool trusted = e->Init(aEventTarget);
e->InitEvent(aType, aParam.mBubbles, aParam.mCancelable);
e->SetTrusted(trusted);
e->SetComposed(aParam.mComposed);
return e.forget();
}
uint16_t Event::EventPhase() const {
if ((mEvent->mCurrentTarget && mEvent->mCurrentTarget == mEvent->mTarget) ||
mEvent->mFlags.mInTargetPhase) {
return Event_Binding::AT_TARGET;
}
if (mEvent->mFlags.mInCapturePhase) {
return Event_Binding::CAPTURING_PHASE;
}
if (mEvent->mFlags.mInBubblingPhase) {
return Event_Binding::BUBBLING_PHASE;
}
return Event_Binding::NONE;
}
void Event::StopPropagation() { mEvent->StopPropagation(); }
void Event::StopImmediatePropagation() { mEvent->StopImmediatePropagation(); }
void Event::StopCrossProcessForwarding() {
mEvent->StopCrossProcessForwarding();
}
void Event::PreventDefault() {
// This method is called only from C++ code which must handle default action
// of this event. So, pass true always.
PreventDefaultInternal(true);
}
void Event::PreventDefault(JSContext* aCx, CallerType aCallerType) {
// Note that at handling default action, another event may be dispatched.
// Then, JS in content mey be call preventDefault()
// even in the event is in system event group. Therefore, don't refer
// mInSystemGroup here.
nsIPrincipal* principal =
mIsMainThreadEvent ? nsContentUtils::SubjectPrincipal(aCx) : nullptr;
PreventDefaultInternal(aCallerType == CallerType::System, principal);
}
void Event::PreventDefaultInternal(bool aCalledByDefaultHandler,
nsIPrincipal* aPrincipal) {
if (!mEvent->mFlags.mCancelable) {
return;
}
if (mEvent->mFlags.mInPassiveListener) {
if (nsPIDOMWindowInner* win = mOwner->GetAsInnerWindow()) {
if (Document* doc = win->GetExtantDoc()) {
if (!doc->HasWarnedAbout(
Document::ePreventDefaultFromPassiveListener)) {
AutoTArray<nsString, 1> params;
GetType(*params.AppendElement());
doc->WarnOnceAbout(Document::ePreventDefaultFromPassiveListener,
false, params);
}
}
}
return;
}
mEvent->PreventDefault(aCalledByDefaultHandler, aPrincipal);
if (!IsTrusted()) {
return;
}
if (mEvent->mClass == eDragEventClass) {
UpdateDefaultPreventedOnContentForDragEvent();
}
}
void Event::UpdateDefaultPreventedOnContentForDragEvent() {
WidgetDragEvent* dragEvent = mEvent->AsDragEvent();
if (!dragEvent) {
return;
}
nsIPrincipal* principal = nullptr;
// Since we now have HTMLEditorEventListener registered on nsWindowRoot,
// mCurrentTarget could be nsWindowRoot, so we need to use
// mTarget if that's the case.
MOZ_ASSERT_IF(dragEvent->mInHTMLEditorEventListener,
mEvent->mCurrentTarget->IsRootWindow());
EventTarget* target = dragEvent->mInHTMLEditorEventListener
? mEvent->mTarget
: mEvent->mCurrentTarget;
nsINode* node = nsINode::FromEventTargetOrNull(target);
if (node) {
principal = node->NodePrincipal();
} else {
nsCOMPtr<nsIScriptObjectPrincipal> sop = do_QueryInterface(target);
if (sop) {
principal = sop->GetPrincipal();
}
}
if (principal && !principal->IsSystemPrincipal()) {
dragEvent->mDefaultPreventedOnContent = true;
}
}
void Event::SetEventType(const nsAString& aEventTypeArg) {
mEvent->mSpecifiedEventTypeString.Truncate();
if (mIsMainThreadEvent) {
EventClassID classID = mEvent->mClass;
if (classID == eMouseEventClass) {
// Some pointer event types were changed from MouseEvent. For backward
// compatibility, we need to handle untrusted events of them created with
// MouseEvent instance in some places.
if (aEventTypeArg.EqualsLiteral(u"click") ||
aEventTypeArg.EqualsLiteral(u"auxclick") ||
aEventTypeArg.EqualsLiteral(u"contextmenu")) {
classID = ePointerEventClass;
}
}
mEvent->mSpecifiedEventType = nsContentUtils::GetEventMessageAndAtom(
aEventTypeArg, classID, &(mEvent->mMessage));
mEvent->SetDefaultComposed();
} else {
mEvent->mSpecifiedEventType = NS_Atomize(u"on"_ns + aEventTypeArg);
mEvent->mMessage = eUnidentifiedEvent;
mEvent->SetComposed(aEventTypeArg);
}
mEvent->SetDefaultComposedInNativeAnonymousContent();
}
already_AddRefed<EventTarget> Event::EnsureWebAccessibleRelatedTarget(
EventTarget* aRelatedTarget) {
nsCOMPtr<EventTarget> relatedTarget = aRelatedTarget;
if (relatedTarget) {
nsIContent* content = nsIContent::FromEventTarget(relatedTarget);
if (content && content->ChromeOnlyAccess() &&
!nsContentUtils::CanAccessNativeAnon()) {
content = content->FindFirstNonChromeOnlyAccessContent();
relatedTarget = content;
}
if (relatedTarget) {
relatedTarget = relatedTarget->GetTargetForDOMEvent();
}
}
return relatedTarget.forget();
}
void Event::InitEvent(const nsAString& aEventTypeArg,
mozilla::CanBubble aCanBubbleArg,
mozilla::Cancelable aCancelableArg,
mozilla::Composed aComposedArg) {
// Make sure this event isn't already being dispatched.
NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);
if (IsTrusted()) {
// Ensure the caller is permitted to dispatch trusted DOM events.
if (!nsContentUtils::ThreadsafeIsCallerChrome()) {
SetTrusted(false);
}
}
SetEventType(aEventTypeArg);
mEvent->mFlags.mBubbles = aCanBubbleArg == CanBubble::eYes;
mEvent->mFlags.mCancelable = aCancelableArg == Cancelable::eYes;
if (aComposedArg != Composed::eDefault) {
mEvent->mFlags.mComposed = aComposedArg == Composed::eYes;
}
mEvent->mFlags.mDefaultPrevented = false;
mEvent->mFlags.mDefaultPreventedByContent = false;
mEvent->mFlags.mDefaultPreventedByChrome = false;
mEvent->mFlags.mPropagationStopped = false;
mEvent->mFlags.mImmediatePropagationStopped = false;
// Clearing the old targets, so that the event is targeted correctly when
// re-dispatching it.
mEvent->mTarget = nullptr;
mEvent->mOriginalTarget = nullptr;
}
void Event::DuplicatePrivateData() {
NS_ASSERTION(mEvent, "No WidgetEvent for Event duplication!");
if (mEventIsInternal) {
return;
}
mEvent = mEvent->Duplicate();
mPresContext = nullptr;
mEventIsInternal = true;
mPrivateDataDuplicated = true;
}
void Event::SetTarget(EventTarget* aTarget) { mEvent->mTarget = aTarget; }
bool Event::IsDispatchStopped() { return mEvent->PropagationStopped(); }
WidgetEvent* Event::WidgetEventPtr() { return mEvent; }
// static
Maybe<CSSDoublePoint> Event::GetScreenCoords(
nsPresContext* aPresContext, WidgetEvent* aEvent,
const LayoutDeviceDoublePoint& aWidgetRelativePoint) {
if (PointerLockManager::IsLocked()) {
return Some(EventStateManager::sLastScreenPoint);
}
if (!aEvent || !aEvent->DOMEventSupportsCoords()) {
return Nothing();
}
// Doing a straight conversion from LayoutDeviceDoublePoint to CSSDoublePoint
// seem incorrect, but it is needed to maintain legacy functionality.
const WidgetGUIEvent* guiEvent = aEvent->AsGUIEvent();
if (MOZ_UNLIKELY(!aPresContext) || !(guiEvent && guiEvent->mWidget)) {
return Some(CSSDoublePoint(aWidgetRelativePoint.x, aWidgetRelativePoint.y));
}
// (Potentially) transform the point from the coordinate space of an
// out-of-process iframe to the coordinate space of the native
// window. The transform can only be applied to a point whose components
// are floating-point values, so convert the integer point first, then
// transform, and then round the result back to an integer point.
const LayoutDeviceIntPoint topLevelPoint = LayoutDeviceIntPoint::Round(
guiEvent->mWidget->WidgetToTopLevelWidgetTransform().TransformPoint(
aWidgetRelativePoint));
const CSSPoint pt = CSSPixel::FromAppUnits(
LayoutDevicePixel::ToAppUnits(
topLevelPoint, aPresContext->DeviceContext()->AppUnitsPerDevPixel()) +
LayoutDevicePixel::ToAppUnits(
guiEvent->mWidget->TopLevelWidgetToScreenOffset(),
aPresContext->DeviceContext()->AppUnitsPerDevPixel()));
return Some(CSSDoublePoint(pt.x, pt.y));
}
// static
CSSDoublePoint Event::GetPageCoords(
nsPresContext* aPresContext, WidgetEvent* aEvent,
const LayoutDeviceDoublePoint& aWidgetRelativePoint,
const CSSDoublePoint& aDefaultClientPoint) {
const CSSDoublePoint clientCoords = Event::GetClientCoords(
aPresContext, aEvent, aWidgetRelativePoint, aDefaultClientPoint);
// If there is some scrolling, add scroll info to client point.
const CSSPoint scrollPoint = CSSPixel::FromAppUnits([&]() {
if (aPresContext && aPresContext->GetPresShell()) {
if (const ScrollContainerFrame* const sf =
aPresContext->PresShell()->GetRootScrollContainerFrame()) {
return sf->GetScrollPosition();
}
}
return nsPoint{};
}());
return clientCoords + CSSDoublePoint(scrollPoint.x, scrollPoint.y);
}
// static
CSSDoublePoint Event::GetClientCoords(
nsPresContext* aPresContext, WidgetEvent* aEvent,
const LayoutDeviceDoublePoint& aWidgetRelativePoint,
const CSSDoublePoint& aDefaultClientPoint) {
if (PointerLockManager::IsLocked()) {
return EventStateManager::sLastClientPoint;
}
if (MOZ_UNLIKELY(!aPresContext) || MOZ_UNLIKELY(!aEvent) ||
!aEvent->DOMEventSupportsCoords() ||
MOZ_UNLIKELY(!aEvent->AsGUIEvent()->mWidget)) {
return aDefaultClientPoint;
}
const PresShell* const presShell = aPresContext->GetPresShell();
if (MOZ_UNLIKELY(!presShell)) {
return CSSDoublePoint(0, 0);
}
// XXX Why don't we flush pending notifications before computing the offset
// from the root frame?
const nsIFrame* const rootFrame = presShell->GetRootFrame();
if (MOZ_UNLIKELY(!rootFrame)) {
return CSSDoublePoint(0, 0);
}
const CSSPoint pt =
CSSPixel::FromAppUnits(nsLayoutUtils::GetEventCoordinatesRelativeTo(
aEvent, LayoutDeviceIntPoint::Round(aWidgetRelativePoint),
RelativeTo{rootFrame}));
return CSSDoublePoint(pt.x, pt.y);
}
// static
nsIFrame* Event::GetPrimaryFrameOfEventTarget(const nsPresContext& aPresContext,
const WidgetEvent& aEvent) {
const nsCOMPtr<nsIContent> content =
nsIContent::FromEventTargetOrNull(aEvent.mTarget);
if (!content) {
return nullptr;
}
// XXX Even after the event target content is moved to different document, we
// may get its primary frame. In this case, should we return nullptr here?
nsIFrame* const frame = content->GetPrimaryFrame(FlushType::Layout);
if (MOZ_UNLIKELY(!frame)) {
return nullptr;
}
// we just return the coordinates of the outer SVG box. This is all kinda
// unfortunate.
if (frame->HasAnyStateBits(NS_FRAME_SVG_LAYOUT) &&
StaticPrefs::dom_events_offset_in_svg_relative_to_svg_root()) {
return SVGUtils::GetOuterSVGFrame(frame);
}
return frame;
}
// static
CSSDoublePoint Event::GetOffsetCoords(
nsPresContext* aPresContext, WidgetEvent* aEvent,
const LayoutDeviceDoublePoint& aWidgetRelativePoint,
const CSSDoublePoint& aDefaultClientPoint) {
if (!aEvent->mTarget) {
return GetPageCoords(aPresContext, aEvent, aWidgetRelativePoint,
aDefaultClientPoint);
}
if (!nsIContent::FromEventTarget(aEvent->mTarget) || !aPresContext) {
return CSSDoublePoint();
}
const nsIFrame* const frame =
GetPrimaryFrameOfEventTarget(*aPresContext, *aEvent);
if (MOZ_UNLIKELY(!frame)) {
return CSSDoublePoint();
}
MOZ_ASSERT(aPresContext->PresShell()->GetRootFrame());
const CSSDoublePoint clientCoords = GetClientCoords(
aPresContext, aEvent, aWidgetRelativePoint, aDefaultClientPoint);
nsPoint ptInAppUnits = CSSPixel::ToAppUnits(CSSPoint(
static_cast<float>(clientCoords.x), static_cast<float>(clientCoords.y)));
if (nsLayoutUtils::TransformPoint(
RelativeTo{aPresContext->PresShell()->GetRootFrame()},
RelativeTo{frame},
ptInAppUnits) != nsLayoutUtils::TRANSFORM_SUCCEEDED) {
return CSSDoublePoint();
}
ptInAppUnits -= frame->GetPaddingRectRelativeToSelf().TopLeft();
const CSSPoint pt = CSSPixel::FromAppUnits(ptInAppUnits);
return CSSDoublePoint(pt.x, pt.y);
}
// To be called ONLY by Event::GetType (which has the additional
// logic for handling user-defined events).
// static
const char16_t* Event::GetEventName(EventMessage aEventType) {
switch (aEventType) {
#define MESSAGE_TO_EVENT(name_, _message, _type, _struct) \
case _message: \
return u"" #name_;
#include "mozilla/EventNameList.h"
#undef MESSAGE_TO_EVENT
default:
break;
}
// XXXldb We can hit this case for WidgetEvent objects that we didn't
// create and that are not user defined events since this function and
// SetEventType are incomplete. (But fixing that requires fixing the
// arrays in nsEventListenerManager too, since the events for which
// this is a problem generally *are* created by Event.)
return nullptr;
}
bool Event::DefaultPrevented(CallerType aCallerType) const {
NS_ENSURE_TRUE(mEvent, false);
// If preventDefault() has never been called, just return false.
if (!mEvent->DefaultPrevented()) {
return false;
}
// If preventDefault() has been called by content, return true. Otherwise,
// i.e., preventDefault() has been called by chrome, return true only when
// this is called by chrome.
return mEvent->DefaultPreventedByContent() ||
aCallerType == CallerType::System;
}
bool Event::ReturnValue(CallerType aCallerType) const {
return !DefaultPrevented(aCallerType);
}
void Event::SetReturnValue(bool aReturnValue, CallerType aCallerType) {
if (!aReturnValue) {
PreventDefaultInternal(aCallerType == CallerType::System);
}
}
double Event::TimeStamp() {
if (mEvent->mTimeStamp.IsNull()) {
return 0.0;
}
if (mIsMainThreadEvent) {
if (NS_WARN_IF(!mOwner)) {
return 0.0;
}
nsPIDOMWindowInner* win = mOwner->GetAsInnerWindow();
if (NS_WARN_IF(!win)) {
return 0.0;
}
Performance* perf = win->GetPerformance();
if (NS_WARN_IF(!perf)) {
return 0.0;
}
double ret =
perf->GetDOMTiming()->TimeStampToDOMHighRes(mEvent->mTimeStamp);
MOZ_ASSERT(mOwner->PrincipalOrNull());
return nsRFPService::ReduceTimePrecisionAsMSecs(
ret, perf->GetRandomTimelineSeed(), perf->GetRTPCallerType());
}
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
MOZ_ASSERT(workerPrivate);
double ret = workerPrivate->TimeStampToDOMHighRes(mEvent->mTimeStamp);
return nsRFPService::ReduceTimePrecisionAsMSecs(
ret, workerPrivate->GetRandomTimelineSeed(),
workerPrivate->GlobalScope()->GetRTPCallerType());
}
void Event::Serialize(IPC::MessageWriter* aWriter,
bool aSerializeInterfaceType) {
if (aSerializeInterfaceType) {
IPC::WriteParam(aWriter, u"event"_ns);
}
nsString type;
GetType(type);
IPC::WriteParam(aWriter, type);
IPC::WriteParam(aWriter, Bubbles());
IPC::WriteParam(aWriter, Cancelable());
IPC::WriteParam(aWriter, IsTrusted());
IPC::WriteParam(aWriter, Composed());
// No timestamp serialization for now!
}
bool Event::Deserialize(IPC::MessageReader* aReader) {
nsString type;
NS_ENSURE_TRUE(IPC::ReadParam(aReader, &type), false);
bool bubbles = false;
NS_ENSURE_TRUE(IPC::ReadParam(aReader, &bubbles), false);
bool cancelable = false;
NS_ENSURE_TRUE(IPC::ReadParam(aReader, &cancelable), false);
bool trusted = false;
NS_ENSURE_TRUE(IPC::ReadParam(aReader, &trusted), false);
bool composed = false;
NS_ENSURE_TRUE(IPC::ReadParam(aReader, &composed), false);
InitEvent(type, bubbles, cancelable);
SetTrusted(trusted);
SetComposed(composed);
return true;
}
void Event::SetOwner(EventTarget* aOwner) {
mOwner = nullptr;
if (!aOwner) {
return;
}
if (nsINode* n = aOwner->GetAsNode()) {
mOwner = n->OwnerDoc()->GetScopeObject();
return;
}
if (nsPIDOMWindowInner* w = aOwner->GetAsInnerWindow()) {
mOwner = w->AsGlobal();
return;
}
nsCOMPtr<DOMEventTargetHelper> eth = do_QueryInterface(aOwner);
if (eth) {
mOwner = eth->GetParentObject();
return;
}
#ifdef DEBUG
nsCOMPtr<nsPIWindowRoot> root = do_QueryInterface(aOwner);
MOZ_ASSERT(root, "Unexpected EventTarget!");
#endif
}
void Event::GetWidgetEventType(WidgetEvent* aEvent, nsAString& aType) {
if (!aEvent->mSpecifiedEventTypeString.IsEmpty()) {
aType = aEvent->mSpecifiedEventTypeString;
return;
}
const char16_t* name = GetEventName(aEvent->mMessage);
if (name) {
aType.AssignLiteral(name, nsString::char_traits::length(name));
return;
} else if (aEvent->mMessage == eUnidentifiedEvent &&
aEvent->mSpecifiedEventType) {
// Remove "on"
aType = Substring(nsDependentAtomString(aEvent->mSpecifiedEventType), 2);
aEvent->mSpecifiedEventTypeString = aType;
return;
}
aType.Truncate();
}
bool Event::IsDragExitEnabled(JSContext* aCx, JSObject* aGlobal) {
return StaticPrefs::dom_event_dragexit_enabled() ||
nsContentUtils::IsSystemCaller(aCx);
}
} // namespace mozilla::dom
using namespace mozilla;
using namespace mozilla::dom;
already_AddRefed<Event> NS_NewDOMEvent(EventTarget* aOwner,
nsPresContext* aPresContext,
WidgetEvent* aEvent) {
RefPtr<Event> it = new Event(aOwner, aPresContext, aEvent);
return it.forget();
}