Source code

Revision control

Copy as Markdown

Other Tools

/* -*- 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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsPresContext.h"
#include "nsContentUtils.h"
#include "nsDocShell.h"
#include "nsError.h"
#include <new>
#include "nsIContent.h"
#include "nsIContentInlines.h"
#include "mozilla/dom/Document.h"
#include "nsINode.h"
#include "nsIScriptObjectPrincipal.h"
#include "nsPIDOMWindow.h"
#include "nsRefreshDriver.h"
#include "AnimationEvent.h"
#include "BeforeUnloadEvent.h"
#include "ClipboardEvent.h"
#include "CommandEvent.h"
#include "CompositionEvent.h"
#include "DeviceMotionEvent.h"
#include "DragEvent.h"
#include "KeyboardEvent.h"
#include "Layers.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/ContentEvents.h"
#include "mozilla/dom/CloseEvent.h"
#include "mozilla/dom/CustomEvent.h"
#include "mozilla/dom/DeviceOrientationEvent.h"
#include "mozilla/dom/EventTarget.h"
#include "mozilla/dom/FocusEvent.h"
#include "mozilla/dom/HashChangeEvent.h"
#include "mozilla/dom/InputEvent.h"
#include "mozilla/dom/MessageEvent.h"
#include "mozilla/dom/MouseScrollEvent.h"
#include "mozilla/dom/MutationEvent.h"
#include "mozilla/dom/NotifyPaintEvent.h"
#include "mozilla/dom/PageTransitionEvent.h"
#include "mozilla/dom/PerformanceEventTiming.h"
#include "mozilla/dom/PointerEvent.h"
#include "mozilla/dom/RootedDictionary.h"
#include "mozilla/dom/ScrollAreaEvent.h"
#include "mozilla/dom/SimpleGestureEvent.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/StorageEvent.h"
#include "mozilla/dom/TimeEvent.h"
#include "mozilla/dom/TouchEvent.h"
#include "mozilla/dom/TransitionEvent.h"
#include "mozilla/dom/WheelEvent.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/XULCommandEvent.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/InternalMutationEvent.h"
#include "mozilla/ipc/MessageChannel.h"
#include "mozilla/MiscEvents.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/ProfilerLabels.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/Telemetry.h"
#include "mozilla/TextEvents.h"
#include "mozilla/TouchEvents.h"
#include "mozilla/Unused.h"
namespace mozilla {
using namespace dom;
class ELMCreationDetector {
public:
ELMCreationDetector()
// We can do this optimization only in the main thread.
: mNonMainThread(!NS_IsMainThread()),
mInitialCount(mNonMainThread
? 0
: EventListenerManager::sMainThreadCreatedCount) {}
bool MayHaveNewListenerManager() {
return mNonMainThread ||
mInitialCount != EventListenerManager::sMainThreadCreatedCount;
}
bool IsMainThread() { return !mNonMainThread; }
private:
bool mNonMainThread;
uint32_t mInitialCount;
};
static bool IsEventTargetChrome(EventTarget* aEventTarget,
Document** aDocument = nullptr) {
if (aDocument) {
*aDocument = nullptr;
}
Document* doc = nullptr;
if (nsINode* node = nsINode::FromEventTargetOrNull(aEventTarget)) {
doc = node->OwnerDoc();
} else if (nsPIDOMWindowInner* window =
nsPIDOMWindowInner::FromEventTargetOrNull(aEventTarget)) {
doc = window->GetExtantDoc();
}
// nsContentUtils::IsChromeDoc is null-safe.
bool isChrome = false;
if (doc) {
isChrome = nsContentUtils::IsChromeDoc(doc);
if (aDocument) {
nsCOMPtr<Document> retVal = doc;
retVal.swap(*aDocument);
}
} else if (nsCOMPtr<nsIScriptObjectPrincipal> sop =
do_QueryInterface(aEventTarget->GetOwnerGlobal())) {
isChrome = sop->GetPrincipal()->IsSystemPrincipal();
}
return isChrome;
}
// EventTargetChainItem represents a single item in the event target chain.
class EventTargetChainItem {
public:
explicit EventTargetChainItem(EventTarget* aTarget)
: mTarget(aTarget), mItemFlags(0) {
MOZ_COUNT_CTOR(EventTargetChainItem);
}
MOZ_COUNTED_DTOR(EventTargetChainItem)
static EventTargetChainItem* Create(nsTArray<EventTargetChainItem>& aChain,
EventTarget* aTarget,
EventTargetChainItem* aChild = nullptr) {
// The last item which can handle the event must be aChild.
MOZ_ASSERT(GetLastCanHandleEventTarget(aChain) == aChild);
MOZ_ASSERT(!aTarget || aTarget == aTarget->GetTargetForEventTargetChain());
EventTargetChainItem* etci = aChain.AppendElement(aTarget);
return etci;
}
static void DestroyLast(nsTArray<EventTargetChainItem>& aChain,
EventTargetChainItem* aItem) {
MOZ_ASSERT(&aChain.LastElement() == aItem);
aChain.RemoveLastElement();
}
static EventTargetChainItem* GetFirstCanHandleEventTarget(
nsTArray<EventTargetChainItem>& aChain) {
return &aChain[GetFirstCanHandleEventTargetIdx(aChain)];
}
static uint32_t GetFirstCanHandleEventTargetIdx(
nsTArray<EventTargetChainItem>& aChain) {
// aChain[i].PreHandleEventOnly() = true only when the target element wants
// PreHandleEvent and set mCanHandle=false. So we find the first element
// which can handle the event.
for (uint32_t i = 0; i < aChain.Length(); ++i) {
if (!aChain[i].PreHandleEventOnly()) {
return i;
}
}
MOZ_ASSERT(false);
return 0;
}
static EventTargetChainItem* GetLastCanHandleEventTarget(
nsTArray<EventTargetChainItem>& aChain) {
// Fine the last item which can handle the event.
for (int32_t i = aChain.Length() - 1; i >= 0; --i) {
if (!aChain[i].PreHandleEventOnly()) {
return &aChain[i];
}
}
return nullptr;
}
bool IsValid() const {
NS_WARNING_ASSERTION(!!(mTarget), "Event target is not valid!");
return !!(mTarget);
}
EventTarget* GetNewTarget() const { return mNewTarget; }
void SetNewTarget(EventTarget* aNewTarget) { mNewTarget = aNewTarget; }
EventTarget* GetRetargetedRelatedTarget() { return mRetargetedRelatedTarget; }
void SetRetargetedRelatedTarget(EventTarget* aTarget) {
mRetargetedRelatedTarget = aTarget;
}
void SetRetargetedTouchTarget(
Maybe<nsTArray<RefPtr<EventTarget>>>&& aTargets) {
mRetargetedTouchTargets = std::move(aTargets);
}
bool HasRetargetTouchTargets() const {
return mRetargetedTouchTargets.isSome() || mInitialTargetTouches.isSome();
}
void RetargetTouchTargets(WidgetTouchEvent* aTouchEvent, Event* aDOMEvent) {
MOZ_ASSERT(HasRetargetTouchTargets());
MOZ_ASSERT(aTouchEvent,
"mRetargetedTouchTargets should be empty when dispatching "
"non-touch events.");
if (mRetargetedTouchTargets.isSome()) {
WidgetTouchEvent::TouchArray& touches = aTouchEvent->mTouches;
MOZ_ASSERT(!touches.Length() ||
touches.Length() == mRetargetedTouchTargets->Length());
for (uint32_t i = 0; i < touches.Length(); ++i) {
touches[i]->mTarget = mRetargetedTouchTargets->ElementAt(i);
}
}
if (aDOMEvent) {
// The number of touch objects in targetTouches list may change depending
// on the retargeting.
TouchEvent* touchDOMEvent = static_cast<TouchEvent*>(aDOMEvent);
TouchList* targetTouches = touchDOMEvent->GetExistingTargetTouches();
if (targetTouches) {
targetTouches->Clear();
if (mInitialTargetTouches.isSome()) {
for (uint32_t i = 0; i < mInitialTargetTouches->Length(); ++i) {
Touch* touch = mInitialTargetTouches->ElementAt(i);
if (touch) {
touch->mTarget = touch->mOriginalTarget;
}
targetTouches->Append(touch);
}
}
}
}
}
void SetInitialTargetTouches(
Maybe<nsTArray<RefPtr<dom::Touch>>>&& aInitialTargetTouches) {
mInitialTargetTouches = std::move(aInitialTargetTouches);
}
void SetForceContentDispatch(bool aForce) {
mFlags.mForceContentDispatch = aForce;
}
bool ForceContentDispatch() const { return mFlags.mForceContentDispatch; }
void SetWantsWillHandleEvent(bool aWants) {
mFlags.mWantsWillHandleEvent = aWants;
}
bool WantsWillHandleEvent() const { return mFlags.mWantsWillHandleEvent; }
void SetWantsPreHandleEvent(bool aWants) {
mFlags.mWantsPreHandleEvent = aWants;
}
bool WantsPreHandleEvent() const { return mFlags.mWantsPreHandleEvent; }
void SetPreHandleEventOnly(bool aWants) {
mFlags.mPreHandleEventOnly = aWants;
}
bool PreHandleEventOnly() const { return mFlags.mPreHandleEventOnly; }
void SetRootOfClosedTree(bool aSet) { mFlags.mRootOfClosedTree = aSet; }
bool IsRootOfClosedTree() const { return mFlags.mRootOfClosedTree; }
void SetItemInShadowTree(bool aSet) { mFlags.mItemInShadowTree = aSet; }
bool IsItemInShadowTree() const { return mFlags.mItemInShadowTree; }
void SetIsSlotInClosedTree(bool aSet) { mFlags.mIsSlotInClosedTree = aSet; }
bool IsSlotInClosedTree() const { return mFlags.mIsSlotInClosedTree; }
void SetIsChromeHandler(bool aSet) { mFlags.mIsChromeHandler = aSet; }
bool IsChromeHandler() const { return mFlags.mIsChromeHandler; }
void SetMayHaveListenerManager(bool aMayHave) {
mFlags.mMayHaveManager = aMayHave;
}
bool MayHaveListenerManager() { return mFlags.mMayHaveManager; }
EventTarget* CurrentTarget() const { return mTarget; }
/**
* Dispatches event through the event target chain.
* Handles capture, target and bubble phases both in default
* and system event group and calls also PostHandleEvent for each
* item in the chain.
*/
MOZ_CAN_RUN_SCRIPT
static void HandleEventTargetChain(nsTArray<EventTargetChainItem>& aChain,
EventChainPostVisitor& aVisitor,
EventDispatchingCallback* aCallback,
ELMCreationDetector& aCd);
/**
* Resets aVisitor object and calls GetEventTargetParent.
* Copies mItemFlags and mItemData to the current EventTargetChainItem.
*/
void GetEventTargetParent(EventChainPreVisitor& aVisitor);
/**
* Calls PreHandleEvent for those items which called SetWantsPreHandleEvent.
*/
void PreHandleEvent(EventChainVisitor& aVisitor);
/**
* If the current item in the event target chain has an event listener
* manager, this method calls EventListenerManager::HandleEvent().
*/
void HandleEvent(EventChainPostVisitor& aVisitor, ELMCreationDetector& aCd) {
if (WantsWillHandleEvent()) {
mTarget->WillHandleEvent(aVisitor);
}
if (aVisitor.mEvent->PropagationStopped()) {
return;
}
if (aVisitor.mEvent->mFlags.mOnlySystemGroupDispatch &&
!aVisitor.mEvent->mFlags.mInSystemGroup) {
return;
}
if (aVisitor.mEvent->mFlags.mOnlySystemGroupDispatchInContent &&
!aVisitor.mEvent->mFlags.mInSystemGroup && !IsCurrentTargetChrome()) {
return;
}
if (!mManager) {
if (!MayHaveListenerManager() && !aCd.MayHaveNewListenerManager()) {
return;
}
mManager = mTarget->GetExistingListenerManager();
}
if (mManager) {
NS_ASSERTION(aVisitor.mEvent->mCurrentTarget == nullptr,
"CurrentTarget should be null!");
if (aVisitor.mEvent->mMessage == eMouseClick) {
aVisitor.mEvent->mFlags.mHadNonPrivilegedClickListeners =
aVisitor.mEvent->mFlags.mHadNonPrivilegedClickListeners ||
mManager->HasNonPrivilegedClickListeners();
}
mManager->HandleEvent(aVisitor.mPresContext, aVisitor.mEvent,
&aVisitor.mDOMEvent, CurrentTarget(),
&aVisitor.mEventStatus, IsItemInShadowTree());
NS_ASSERTION(aVisitor.mEvent->mCurrentTarget == nullptr,
"CurrentTarget should be null!");
}
}
/**
* Copies mItemFlags and mItemData to aVisitor and calls PostHandleEvent.
*/
MOZ_CAN_RUN_SCRIPT void PostHandleEvent(EventChainPostVisitor& aVisitor);
private:
const nsCOMPtr<EventTarget> mTarget;
nsCOMPtr<EventTarget> mRetargetedRelatedTarget;
Maybe<nsTArray<RefPtr<EventTarget>>> mRetargetedTouchTargets;
Maybe<nsTArray<RefPtr<dom::Touch>>> mInitialTargetTouches;
class EventTargetChainFlags {
public:
explicit EventTargetChainFlags() { SetRawFlags(0); }
// Cached flags for each EventTargetChainItem which are set when calling
// GetEventTargetParent to create event target chain. They are used to
// manage or speedup event dispatching.
bool mForceContentDispatch : 1;
bool mWantsWillHandleEvent : 1;
bool mMayHaveManager : 1;
bool mChechedIfChrome : 1;
bool mIsChromeContent : 1;
bool mWantsPreHandleEvent : 1;
bool mPreHandleEventOnly : 1;
bool mRootOfClosedTree : 1;
bool mItemInShadowTree : 1;
bool mIsSlotInClosedTree : 1;
bool mIsChromeHandler : 1;
private:
using RawFlags = uint32_t;
void SetRawFlags(RawFlags aRawFlags) {
static_assert(
sizeof(EventTargetChainFlags) <= sizeof(RawFlags),
"EventTargetChainFlags must not be bigger than the RawFlags");
memcpy(this, &aRawFlags, sizeof(EventTargetChainFlags));
}
} mFlags;
uint16_t mItemFlags;
nsCOMPtr<nsISupports> mItemData;
// Event retargeting must happen whenever mNewTarget is non-null.
nsCOMPtr<EventTarget> mNewTarget;
// Cache mTarget's event listener manager.
RefPtr<EventListenerManager> mManager;
bool IsCurrentTargetChrome() {
if (!mFlags.mChechedIfChrome) {
mFlags.mChechedIfChrome = true;
if (IsEventTargetChrome(mTarget)) {
mFlags.mIsChromeContent = true;
}
}
return mFlags.mIsChromeContent;
}
};
void EventTargetChainItem::GetEventTargetParent(
EventChainPreVisitor& aVisitor) {
aVisitor.Reset();
mTarget->GetEventTargetParent(aVisitor);
SetForceContentDispatch(aVisitor.mForceContentDispatch);
SetWantsWillHandleEvent(aVisitor.mWantsWillHandleEvent);
SetMayHaveListenerManager(aVisitor.mMayHaveListenerManager);
SetWantsPreHandleEvent(aVisitor.mWantsPreHandleEvent);
SetPreHandleEventOnly(aVisitor.mWantsPreHandleEvent && !aVisitor.mCanHandle);
SetRootOfClosedTree(aVisitor.mRootOfClosedTree);
SetItemInShadowTree(aVisitor.mItemInShadowTree);
SetRetargetedRelatedTarget(aVisitor.mRetargetedRelatedTarget);
SetRetargetedTouchTarget(std::move(aVisitor.mRetargetedTouchTargets));
mItemFlags = aVisitor.mItemFlags;
mItemData = aVisitor.mItemData;
}
void EventTargetChainItem::PreHandleEvent(EventChainVisitor& aVisitor) {
if (!WantsPreHandleEvent()) {
return;
}
aVisitor.mItemFlags = mItemFlags;
aVisitor.mItemData = mItemData;
Unused << mTarget->PreHandleEvent(aVisitor);
}
void EventTargetChainItem::PostHandleEvent(EventChainPostVisitor& aVisitor) {
aVisitor.mItemFlags = mItemFlags;
aVisitor.mItemData = mItemData;
mTarget->PostHandleEvent(aVisitor);
}
void EventTargetChainItem::HandleEventTargetChain(
nsTArray<EventTargetChainItem>& aChain, EventChainPostVisitor& aVisitor,
EventDispatchingCallback* aCallback, ELMCreationDetector& aCd) {
// Save the target so that it can be restored later.
nsCOMPtr<EventTarget> firstTarget = aVisitor.mEvent->mTarget;
nsCOMPtr<EventTarget> firstRelatedTarget = aVisitor.mEvent->mRelatedTarget;
Maybe<AutoTArray<nsCOMPtr<EventTarget>, 10>> firstTouchTargets;
WidgetTouchEvent* touchEvent = nullptr;
if (aVisitor.mEvent->mClass == eTouchEventClass) {
touchEvent = aVisitor.mEvent->AsTouchEvent();
if (!aVisitor.mEvent->mFlags.mInSystemGroup) {
firstTouchTargets.emplace();
WidgetTouchEvent* touchEvent = aVisitor.mEvent->AsTouchEvent();
WidgetTouchEvent::TouchArray& touches = touchEvent->mTouches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
firstTouchTargets->AppendElement(touches[i]->mTarget);
}
}
}
uint32_t chainLength = aChain.Length();
uint32_t firstCanHandleEventTargetIdx =
EventTargetChainItem::GetFirstCanHandleEventTargetIdx(aChain);
// Capture
aVisitor.mEvent->mFlags.mInCapturePhase = true;
aVisitor.mEvent->mFlags.mInBubblingPhase = false;
for (uint32_t i = chainLength - 1; i > firstCanHandleEventTargetIdx; --i) {
EventTargetChainItem& item = aChain[i];
if (item.PreHandleEventOnly()) {
continue;
}
if ((!aVisitor.mEvent->mFlags.mNoContentDispatch ||
item.ForceContentDispatch()) &&
!aVisitor.mEvent->PropagationStopped()) {
item.HandleEvent(aVisitor, aCd);
}
if (item.GetNewTarget()) {
// item is at anonymous boundary. Need to retarget for the child items.
for (uint32_t j = i; j > 0; --j) {
uint32_t childIndex = j - 1;
EventTarget* newTarget = aChain[childIndex].GetNewTarget();
if (newTarget) {
aVisitor.mEvent->mTarget = newTarget;
break;
}
}
}
// Step 14.2
// "Set event's relatedTarget to tuple's relatedTarget."
// Note, the initial retargeting was done already when creating
// event target chain, so we need to do this only after calling
// HandleEvent, not before, like in the specification.
if (item.GetRetargetedRelatedTarget()) {
bool found = false;
for (uint32_t j = i; j > 0; --j) {
uint32_t childIndex = j - 1;
EventTarget* relatedTarget =
aChain[childIndex].GetRetargetedRelatedTarget();
if (relatedTarget) {
found = true;
aVisitor.mEvent->mRelatedTarget = relatedTarget;
break;
}
}
if (!found) {
aVisitor.mEvent->mRelatedTarget =
aVisitor.mEvent->mOriginalRelatedTarget;
}
}
if (item.HasRetargetTouchTargets()) {
bool found = false;
for (uint32_t j = i; j > 0; --j) {
uint32_t childIndex = j - 1;
if (aChain[childIndex].HasRetargetTouchTargets()) {
found = true;
aChain[childIndex].RetargetTouchTargets(touchEvent,
aVisitor.mDOMEvent);
break;
}
}
if (!found) {
WidgetTouchEvent::TouchArray& touches = touchEvent->mTouches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
touches[i]->mTarget = touches[i]->mOriginalTarget;
}
}
}
}
// Target
aVisitor.mEvent->mFlags.mInBubblingPhase = true;
EventTargetChainItem& targetItem = aChain[firstCanHandleEventTargetIdx];
// Need to explicitly retarget touch targets so that initial targets get set
// properly in case nothing else retargeted touches.
if (targetItem.HasRetargetTouchTargets()) {
targetItem.RetargetTouchTargets(touchEvent, aVisitor.mDOMEvent);
}
if (!aVisitor.mEvent->PropagationStopped() &&
(!aVisitor.mEvent->mFlags.mNoContentDispatch ||
targetItem.ForceContentDispatch())) {
targetItem.HandleEvent(aVisitor, aCd);
}
if (aVisitor.mEvent->mFlags.mInSystemGroup) {
targetItem.PostHandleEvent(aVisitor);
}
// Bubble
aVisitor.mEvent->mFlags.mInCapturePhase = false;
for (uint32_t i = firstCanHandleEventTargetIdx + 1; i < chainLength; ++i) {
EventTargetChainItem& item = aChain[i];
if (item.PreHandleEventOnly()) {
continue;
}
EventTarget* newTarget = item.GetNewTarget();
if (newTarget) {
// Item is at anonymous boundary. Need to retarget for the current item
// and for parent items.
aVisitor.mEvent->mTarget = newTarget;
}
// Step 15.2
// "Set event's relatedTarget to tuple's relatedTarget."
EventTarget* relatedTarget = item.GetRetargetedRelatedTarget();
if (relatedTarget) {
aVisitor.mEvent->mRelatedTarget = relatedTarget;
}
if (item.HasRetargetTouchTargets()) {
item.RetargetTouchTargets(touchEvent, aVisitor.mDOMEvent);
}
if (aVisitor.mEvent->mFlags.mBubbles || newTarget) {
if ((!aVisitor.mEvent->mFlags.mNoContentDispatch ||
item.ForceContentDispatch()) &&
!aVisitor.mEvent->PropagationStopped()) {
item.HandleEvent(aVisitor, aCd);
}
if (aVisitor.mEvent->mFlags.mInSystemGroup) {
item.PostHandleEvent(aVisitor);
}
}
}
aVisitor.mEvent->mFlags.mInBubblingPhase = false;
if (!aVisitor.mEvent->mFlags.mInSystemGroup &&
aVisitor.mEvent->IsAllowedToDispatchInSystemGroup()) {
// Dispatch to the system event group. Make sure to clear the
// STOP_DISPATCH flag since this resets for each event group.
aVisitor.mEvent->mFlags.mPropagationStopped = false;
aVisitor.mEvent->mFlags.mImmediatePropagationStopped = false;
// Setting back the original target of the event.
aVisitor.mEvent->mTarget = aVisitor.mEvent->mOriginalTarget;
aVisitor.mEvent->mRelatedTarget = aVisitor.mEvent->mOriginalRelatedTarget;
if (firstTouchTargets) {
WidgetTouchEvent::TouchArray& touches = touchEvent->mTouches;
for (uint32_t i = 0; i < touches.Length(); ++i) {
touches[i]->mTarget = touches[i]->mOriginalTarget;
}
}
// Special handling if PresShell (or some other caller)
// used a callback object.
if (aCallback) {
aCallback->HandleEvent(aVisitor);
}
// Retarget for system event group (which does the default handling too).
// Setting back the target which was used also for default event group.
aVisitor.mEvent->mTarget = firstTarget;
aVisitor.mEvent->mRelatedTarget = firstRelatedTarget;
if (firstTouchTargets) {
WidgetTouchEvent::TouchArray& touches = touchEvent->mTouches;
for (uint32_t i = 0; i < firstTouchTargets->Length(); ++i) {
touches[i]->mTarget = firstTouchTargets->ElementAt(i);
}
}
aVisitor.mEvent->mFlags.mInSystemGroup = true;
HandleEventTargetChain(aChain, aVisitor, aCallback, aCd);
aVisitor.mEvent->mFlags.mInSystemGroup = false;
// After dispatch, clear all the propagation flags so that
// system group listeners don't affect to the event.
aVisitor.mEvent->mFlags.mPropagationStopped = false;
aVisitor.mEvent->mFlags.mImmediatePropagationStopped = false;
}
}
static nsTArray<EventTargetChainItem>* sCachedMainThreadChain = nullptr;
/* static */
void EventDispatcher::Shutdown() {
delete sCachedMainThreadChain;
sCachedMainThreadChain = nullptr;
}
EventTargetChainItem* EventTargetChainItemForChromeTarget(
nsTArray<EventTargetChainItem>& aChain, nsINode* aNode,
EventTargetChainItem* aChild = nullptr) {
if (!aNode->IsInComposedDoc()) {
return nullptr;
}
nsPIDOMWindowInner* win = aNode->OwnerDoc()->GetInnerWindow();
EventTarget* piTarget = win ? win->GetParentTarget() : nullptr;
NS_ENSURE_TRUE(piTarget, nullptr);
EventTargetChainItem* etci = EventTargetChainItem::Create(
aChain, piTarget->GetTargetForEventTargetChain(), aChild);
if (!etci->IsValid()) {
EventTargetChainItem::DestroyLast(aChain, etci);
return nullptr;
}
return etci;
}
/* static */ EventTargetChainItem* MayRetargetToChromeIfCanNotHandleEvent(
nsTArray<EventTargetChainItem>& aChain, EventChainPreVisitor& aPreVisitor,
EventTargetChainItem* aTargetEtci, EventTargetChainItem* aChildEtci,
nsINode* aContent) {
if (!aPreVisitor.mWantsPreHandleEvent) {
// Keep EventTargetChainItem if we need to call PreHandleEvent on it.
EventTargetChainItem::DestroyLast(aChain, aTargetEtci);
}
if (aPreVisitor.mAutomaticChromeDispatch && aContent) {
aPreVisitor.mRelatedTargetRetargetedInCurrentScope = false;
// Event target couldn't handle the event. Try to propagate to chrome.
EventTargetChainItem* chromeTargetEtci =
EventTargetChainItemForChromeTarget(aChain, aContent, aChildEtci);
if (chromeTargetEtci) {
// If we propagate to chrome, need to ensure we mark
// EventTargetChainItem to be chrome handler so that event.composedPath()
// can return the right value.
chromeTargetEtci->SetIsChromeHandler(true);
chromeTargetEtci->GetEventTargetParent(aPreVisitor);
return chromeTargetEtci;
}
}
return nullptr;
}
static bool ShouldClearTargets(WidgetEvent* aEvent) {
if (nsIContent* finalTarget =
nsIContent::FromEventTargetOrNull(aEvent->mTarget)) {
if (finalTarget->SubtreeRoot()->IsShadowRoot()) {
return true;
}
}
if (nsIContent* finalRelatedTarget =
nsIContent::FromEventTargetOrNull(aEvent->mRelatedTarget)) {
if (finalRelatedTarget->SubtreeRoot()->IsShadowRoot()) {
return true;
}
}
// XXXsmaug Check also all the touch objects.
return false;
}
static void DescribeEventTargetForProfilerMarker(const EventTarget* aTarget,
nsACString& aDescription) {
auto* node = aTarget->GetAsNode();
if (node) {
if (node->IsElement()) {
nsAutoString nodeDescription;
node->AsElement()->Describe(nodeDescription, true);
aDescription = NS_ConvertUTF16toUTF8(nodeDescription);
} else if (node->IsDocument()) {
aDescription.AssignLiteral("document");
} else if (node->IsText()) {
aDescription.AssignLiteral("text");
} else if (node->IsDocumentFragment()) {
aDescription.AssignLiteral("document fragment");
}
} else if (aTarget->IsInnerWindow() || aTarget->IsOuterWindow()) {
aDescription.AssignLiteral("window");
} else if (aTarget->IsRootWindow()) {
aDescription.AssignLiteral("root window");
} else {
// Probably something that inherits from DOMEventTargetHelper.
}
}
/* static */
nsresult EventDispatcher::Dispatch(nsISupports* aTarget,
nsPresContext* aPresContext,
WidgetEvent* aEvent, Event* aDOMEvent,
nsEventStatus* aEventStatus,
EventDispatchingCallback* aCallback,
nsTArray<EventTarget*>* aTargets) {
AUTO_PROFILER_LABEL("EventDispatcher::Dispatch", OTHER);
NS_ASSERTION(aEvent, "Trying to dispatch without WidgetEvent!");
NS_ENSURE_TRUE(!aEvent->mFlags.mIsBeingDispatched,
NS_ERROR_DOM_INVALID_STATE_ERR);
NS_ASSERTION(!aTargets || !aEvent->mMessage, "Wrong parameters!");
// If we're dispatching an already created DOMEvent object, make
// sure it is initialized!
// If aTargets is non-null, the event isn't going to be dispatched.
NS_ENSURE_TRUE(aEvent->mMessage || !aDOMEvent || aTargets,
NS_ERROR_DOM_INVALID_STATE_ERR);
// Events shall not be fired while we are in stable state to prevent anything
// visible from the scripts.
MOZ_ASSERT(!nsContentUtils::IsInStableOrMetaStableState());
NS_ENSURE_TRUE(!nsContentUtils::IsInStableOrMetaStableState(),
NS_ERROR_DOM_INVALID_STATE_ERR);
nsCOMPtr<EventTarget> target = do_QueryInterface(aTarget);
RefPtr<PerformanceEventTiming> eventTimingEntry;
// Similar to PerformancePaintTiming, we don't need to
// expose them for printing documents
if (aPresContext && !aPresContext->IsPrintingOrPrintPreview()) {
eventTimingEntry =
PerformanceEventTiming::TryGenerateEventTiming(target, aEvent);
}
bool retargeted = false;
if (aEvent->mFlags.mRetargetToNonNativeAnonymous) {
nsIContent* content = nsIContent::FromEventTargetOrNull(target);
if (content && content->IsInNativeAnonymousSubtree()) {
nsCOMPtr<EventTarget> newTarget =
content->FindFirstNonChromeOnlyAccessContent();
NS_ENSURE_STATE(newTarget);
aEvent->mOriginalTarget = target;
target = newTarget;
retargeted = true;
}
}
if (aEvent->mFlags.mOnlyChromeDispatch) {
nsCOMPtr<Document> doc;
if (!IsEventTargetChrome(target, getter_AddRefs(doc)) && doc) {
nsPIDOMWindowInner* win = doc->GetInnerWindow();
// If we can't dispatch the event to chrome, do nothing.
EventTarget* piTarget = win ? win->GetParentTarget() : nullptr;
if (!piTarget) {
return NS_OK;
}
// Set the target to be the original dispatch target,
aEvent->mTarget = target;
// but use chrome event handler or BrowserChildMessageManager for event
// target chain.
target = piTarget;
} else if (NS_WARN_IF(!doc)) {
return NS_ERROR_UNEXPECTED;
}
}
#ifdef DEBUG
if (NS_IsMainThread() && aEvent->mMessage != eVoidEvent &&
!nsContentUtils::IsSafeToRunScript()) {
static const auto warn = [](bool aIsSystem) {
if (aIsSystem) {
NS_WARNING("Fix the caller!");
} else {
MOZ_CRASH("This is unsafe! Fix the caller!");
}
};
if (nsINode* node = nsINode::FromEventTargetOrNull(target)) {
// If this is a node, it's possible that this is some sort of DOM tree
// that is never accessed by script (for example an SVG image or XBL
// binding document or whatnot). We really only want to warn/assert here
// if there might be actual scripted listeners for this event, so restrict
// the warnings/asserts to the case when script can or once could touch
// this node's document.
Document* doc = node->OwnerDoc();
bool hasHadScriptHandlingObject;
nsIGlobalObject* global =
doc->GetScriptHandlingObject(hasHadScriptHandlingObject);
if (global || hasHadScriptHandlingObject) {
warn(nsContentUtils::IsChromeDoc(doc));
}
} else if (nsCOMPtr<nsIGlobalObject> global = target->GetOwnerGlobal()) {
warn(global->PrincipalOrNull()->IsSystemPrincipal());
}
}
if (aDOMEvent) {
WidgetEvent* innerEvent = aDOMEvent->WidgetEventPtr();
NS_ASSERTION(innerEvent == aEvent,
"The inner event of aDOMEvent is not the same as aEvent!");
}
#endif
nsresult rv = NS_OK;
bool externalDOMEvent = !!(aDOMEvent);
// If we have a PresContext, make sure it doesn't die before
// event dispatching is finished.
RefPtr<nsPresContext> kungFuDeathGrip(aPresContext);
ELMCreationDetector cd;
nsTArray<EventTargetChainItem> chain;
if (cd.IsMainThread()) {
if (!sCachedMainThreadChain) {
sCachedMainThreadChain = new nsTArray<EventTargetChainItem>();
}
chain = std::move(*sCachedMainThreadChain);
chain.SetCapacity(128);
}
// Create the event target chain item for the event target.
EventTargetChainItem* targetEtci = EventTargetChainItem::Create(
chain, target->GetTargetForEventTargetChain());
MOZ_ASSERT(&chain[0] == targetEtci);
if (!targetEtci->IsValid()) {
EventTargetChainItem::DestroyLast(chain, targetEtci);
return NS_ERROR_FAILURE;
}
// Make sure that Event::target and Event::originalTarget
// point to the last item in the chain.
if (!aEvent->mTarget) {
// Note, CurrentTarget() points always to the object returned by
// GetTargetForEventTargetChain().
aEvent->mTarget = targetEtci->CurrentTarget();
} else {
// XXX But if the target is already set, use that. This is a hack
// for the 'load', 'beforeunload' and 'unload' events,
// which are dispatched to |window| but have document as their target.
//
// Make sure that the event target points to the right object.
aEvent->mTarget = aEvent->mTarget->GetTargetForEventTargetChain();
NS_ENSURE_STATE(aEvent->mTarget);
}
if (retargeted) {
aEvent->mOriginalTarget =
aEvent->mOriginalTarget->GetTargetForEventTargetChain();
NS_ENSURE_STATE(aEvent->mOriginalTarget);
} else {
aEvent->mOriginalTarget = aEvent->mTarget;
}
aEvent->mOriginalRelatedTarget = aEvent->mRelatedTarget;
bool clearTargets = false;
nsCOMPtr<nsIContent> content =
nsIContent::FromEventTargetOrNull(aEvent->mOriginalTarget);
bool isInAnon = content && content->IsInNativeAnonymousSubtree();
aEvent->mFlags.mIsBeingDispatched = true;
// Create visitor object and start event dispatching.
// GetEventTargetParent for the original target.
nsEventStatus status = aDOMEvent && aDOMEvent->DefaultPrevented()
? nsEventStatus_eConsumeNoDefault
: aEventStatus ? *aEventStatus
: nsEventStatus_eIgnore;
nsCOMPtr<EventTarget> targetForPreVisitor = aEvent->mTarget;
EventChainPreVisitor preVisitor(aPresContext, aEvent, aDOMEvent, status,
isInAnon, targetForPreVisitor);
targetEtci->GetEventTargetParent(preVisitor);
if (!preVisitor.mCanHandle) {
targetEtci = MayRetargetToChromeIfCanNotHandleEvent(
chain, preVisitor, targetEtci, nullptr, content);
}
if (!preVisitor.mCanHandle) {
// The original target and chrome target (mAutomaticChromeDispatch=true)
// can not handle the event but we still have to call their PreHandleEvent.
for (uint32_t i = 0; i < chain.Length(); ++i) {
chain[i].PreHandleEvent(preVisitor);
}
clearTargets = ShouldClearTargets(aEvent);
} else {
// At least the original target can handle the event.
// Setting the retarget to the |target| simplifies retargeting code.
nsCOMPtr<EventTarget> t = aEvent->mTarget;
targetEtci->SetNewTarget(t);
// In order to not change the targetTouches array passed to TouchEvents
// when dispatching events from JS, we need to store the initial Touch
// objects on the list.
if (aEvent->mClass == eTouchEventClass && aDOMEvent) {
TouchEvent* touchEvent = static_cast<TouchEvent*>(aDOMEvent);
TouchList* targetTouches = touchEvent->GetExistingTargetTouches();
if (targetTouches) {
Maybe<nsTArray<RefPtr<dom::Touch>>> initialTargetTouches;
initialTargetTouches.emplace();
for (uint32_t i = 0; i < targetTouches->Length(); ++i) {
initialTargetTouches->AppendElement(targetTouches->Item(i));
}
targetEtci->SetInitialTargetTouches(std::move(initialTargetTouches));
targetTouches->Clear();
}
}
EventTargetChainItem* topEtci = targetEtci;
targetEtci = nullptr;
while (preVisitor.GetParentTarget()) {
EventTarget* parentTarget = preVisitor.GetParentTarget();
EventTargetChainItem* parentEtci =
EventTargetChainItem::Create(chain, parentTarget, topEtci);
if (!parentEtci->IsValid()) {
EventTargetChainItem::DestroyLast(chain, parentEtci);
rv = NS_ERROR_FAILURE;
break;
}
parentEtci->SetIsSlotInClosedTree(preVisitor.mParentIsSlotInClosedTree);
parentEtci->SetIsChromeHandler(preVisitor.mParentIsChromeHandler);
// Item needs event retargetting.
if (preVisitor.mEventTargetAtParent) {
// Need to set the target of the event
// so that also the next retargeting works.
preVisitor.mTargetInKnownToBeHandledScope = preVisitor.mEvent->mTarget;
preVisitor.mEvent->mTarget = preVisitor.mEventTargetAtParent;
parentEtci->SetNewTarget(preVisitor.mEventTargetAtParent);
}
if (preVisitor.mRetargetedRelatedTarget) {
preVisitor.mEvent->mRelatedTarget = preVisitor.mRetargetedRelatedTarget;
}
parentEtci->GetEventTargetParent(preVisitor);
if (preVisitor.mCanHandle) {
preVisitor.mTargetInKnownToBeHandledScope = preVisitor.mEvent->mTarget;
topEtci = parentEtci;
} else {
bool ignoreBecauseOfShadowDOM = preVisitor.mIgnoreBecauseOfShadowDOM;
nsCOMPtr<nsINode> disabledTarget =
nsINode::FromEventTargetOrNull(parentTarget);
parentEtci = MayRetargetToChromeIfCanNotHandleEvent(
chain, preVisitor, parentEtci, topEtci, disabledTarget);
if (parentEtci && preVisitor.mCanHandle) {
preVisitor.mTargetInKnownToBeHandledScope =
preVisitor.mEvent->mTarget;
EventTargetChainItem* item =
EventTargetChainItem::GetFirstCanHandleEventTarget(chain);
if (!ignoreBecauseOfShadowDOM) {
// If we ignored the target because of Shadow DOM retargeting, we
// shouldn't treat the target to be in the event path at all.
item->SetNewTarget(parentTarget);
}
topEtci = parentEtci;
continue;
}
break;
}
}
if (NS_SUCCEEDED(rv)) {
if (aTargets) {
aTargets->Clear();
uint32_t numTargets = chain.Length();
EventTarget** targets = aTargets->AppendElements(numTargets);
for (uint32_t i = 0; i < numTargets; ++i) {
targets[i] = chain[i].CurrentTarget()->GetTargetForDOMEvent();
}
} else {
// Event target chain is created. PreHandle the chain.
for (uint32_t i = 0; i < chain.Length(); ++i) {
chain[i].PreHandleEvent(preVisitor);
}
RefPtr<nsRefreshDriver> refreshDriver;
if (aPresContext && aPresContext->GetRootPresContext() &&
aEvent->IsTrusted() &&
(aEvent->mMessage == eKeyPress ||
aEvent->mMessage == eMouseClick)) {
refreshDriver = aPresContext->GetRootPresContext()->RefreshDriver();
if (refreshDriver) {
refreshDriver->EnterUserInputProcessing();
}
}
auto cleanup = MakeScopeExit([&] {
if (refreshDriver) {
refreshDriver->ExitUserInputProcessing();
}
});
clearTargets = ShouldClearTargets(aEvent);
// Handle the chain.
EventChainPostVisitor postVisitor(preVisitor);
MOZ_RELEASE_ASSERT(!aEvent->mPath);
aEvent->mPath = &chain;
if (profiler_is_active()) {
// Add a profiler label and a profiler marker for the actual
// dispatch of the event.
// This is a very hot code path, so we need to make sure not to
// do this extra work when we're not profiling.
if (!postVisitor.mDOMEvent) {
// This is tiny bit slow, but happens only once per event.
// Similar code also in EventListenerManager.
nsCOMPtr<EventTarget> et = aEvent->mOriginalTarget;
RefPtr<Event> event =
EventDispatcher::CreateEvent(et, aPresContext, aEvent, u""_ns);
event.swap(postVisitor.mDOMEvent);
}
nsAutoString typeStr;
postVisitor.mDOMEvent->GetType(typeStr);
AUTO_PROFILER_LABEL_DYNAMIC_LOSSY_NSSTRING(
"EventDispatcher::Dispatch", OTHER, typeStr);
nsCOMPtr<nsIDocShell> docShell;
docShell = nsContentUtils::GetDocShellForEventTarget(aEvent->mTarget);
MarkerInnerWindowId innerWindowId;
if (nsCOMPtr<nsPIDOMWindowInner> inner =
do_QueryInterface(aEvent->mTarget->GetOwnerGlobal())) {
innerWindowId = MarkerInnerWindowId{inner->WindowID()};
}
struct DOMEventMarker {
static constexpr Span<const char> MarkerTypeName() {
return MakeStringSpan("DOMEvent");
}
static void StreamJSONMarkerData(
baseprofiler::SpliceableJSONWriter& aWriter,
const ProfilerString16View& aEventType,
const nsCString& aTarget, const TimeStamp& aStartTime,
const TimeStamp& aEventTimeStamp) {
aWriter.StringProperty("eventType",
NS_ConvertUTF16toUTF8(aEventType));
if (!aTarget.IsEmpty()) {
aWriter.StringProperty("target", aTarget);
}
// This is the event processing latency, which is the time from
// when the event was created, to when it was started to be
// processed. Note that the computation of this latency is
// deferred until serialization time, at the expense of some extra
// memory.
aWriter.DoubleProperty(
"latency", (aStartTime - aEventTimeStamp).ToMilliseconds());
}
static MarkerSchema MarkerTypeDisplay() {
using MS = MarkerSchema;
MS schema{MS::Location::MarkerChart, MS::Location::MarkerTable,
MS::Location::TimelineOverview};
schema.SetChartLabel("{marker.data.eventType}");
schema.SetTooltipLabel("{marker.data.eventType} - DOMEvent");
schema.SetTableLabel(
"{marker.data.eventType} - {marker.data.target}");
schema.AddKeyLabelFormat("target", "Event Target",
MS::Format::String);
schema.AddKeyLabelFormat("latency", "Latency",
MS::Format::Duration);
return schema;
}
};
nsAutoCString target;
DescribeEventTargetForProfilerMarker(aEvent->mTarget, target);
auto startTime = TimeStamp::Now();
profiler_add_marker("DOMEvent", geckoprofiler::category::DOM,
{MarkerTiming::IntervalStart(),
MarkerInnerWindowId(innerWindowId)},
DOMEventMarker{}, typeStr, target, startTime,
aEvent->mTimeStamp);
EventTargetChainItem::HandleEventTargetChain(chain, postVisitor,
aCallback, cd);
profiler_add_marker(
"DOMEvent", geckoprofiler::category::DOM,
{MarkerTiming::IntervalEnd(), std::move(innerWindowId)},
DOMEventMarker{}, typeStr, target, startTime, aEvent->mTimeStamp);
} else {
EventTargetChainItem::HandleEventTargetChain(chain, postVisitor,
aCallback, cd);
}
aEvent->mPath = nullptr;
if (aPresContext && aPresContext->GetRootPresContext() &&
aEvent->IsTrusted()) {
nsRefreshDriver* driver =
aPresContext->GetRootPresContext()->RefreshDriver();
if (driver && driver->HasPendingTick()) {
switch (aEvent->mMessage) {
case eKeyPress:
driver->RegisterCompositionPayload(
{layers::CompositionPayloadType::eKeyPress,
aEvent->mTimeStamp});
break;
case eMouseClick: {
if (aEvent->AsMouseEvent()->mInputSource ==
MouseEvent_Binding::MOZ_SOURCE_MOUSE ||
aEvent->AsMouseEvent()->mInputSource ==
MouseEvent_Binding::MOZ_SOURCE_TOUCH) {
driver->RegisterCompositionPayload(
{layers::CompositionPayloadType::eMouseUpFollowedByClick,
aEvent->mTimeStamp});
}
break;
}
default:
break;
}
}
}
preVisitor.mEventStatus = postVisitor.mEventStatus;
// If the DOM event was created during event flow.
if (!preVisitor.mDOMEvent && postVisitor.mDOMEvent) {
preVisitor.mDOMEvent = postVisitor.mDOMEvent;
}
}
}
}
// Note, EventTargetChainItem objects are deleted when the chain goes out of
// the scope.
aEvent->mFlags.mIsBeingDispatched = false;
aEvent->mFlags.mDispatchedAtLeastOnce = true;
if (eventTimingEntry) {
eventTimingEntry->FinalizeEventTiming(aEvent->mTarget);
}
// step 10. If clearTargets, then:
// 1. Set event's target to null.
// 2. Set event's relatedTarget to null.
// 3. Set event's touch target list to the empty list.
if (clearTargets) {
aEvent->mTarget = nullptr;
aEvent->mOriginalTarget = nullptr;
aEvent->mRelatedTarget = nullptr;
aEvent->mOriginalRelatedTarget = nullptr;
// XXXsmaug Check also all the touch objects.
}
if (!externalDOMEvent && preVisitor.mDOMEvent) {
// A dom::Event was created while dispatching the event.
// Duplicate private data if someone holds a pointer to it.
nsrefcnt rc = 0;
NS_RELEASE2(preVisitor.mDOMEvent, rc);
if (preVisitor.mDOMEvent) {
preVisitor.mDOMEvent->DuplicatePrivateData();
}
}
if (aEventStatus) {
*aEventStatus = preVisitor.mEventStatus;
}
if (cd.IsMainThread() && chain.Capacity() == 128 && sCachedMainThreadChain) {
chain.ClearAndRetainStorage();
chain.SwapElements(*sCachedMainThreadChain);
}
return rv;
}
/* static */
nsresult EventDispatcher::DispatchDOMEvent(nsISupports* aTarget,
WidgetEvent* aEvent,
Event* aDOMEvent,
nsPresContext* aPresContext,
nsEventStatus* aEventStatus) {
if (aDOMEvent) {
WidgetEvent* innerEvent = aDOMEvent->WidgetEventPtr();
NS_ENSURE_TRUE(innerEvent, NS_ERROR_ILLEGAL_VALUE);
// Don't modify the event if it's being dispatched right now.
if (innerEvent->mFlags.mIsBeingDispatched) {
return NS_ERROR_DOM_INVALID_STATE_ERR;
}
bool dontResetTrusted = false;
if (innerEvent->mFlags.mDispatchedAtLeastOnce) {
innerEvent->mTarget = nullptr;
innerEvent->mOriginalTarget = nullptr;
} else {
dontResetTrusted = aDOMEvent->IsTrusted();
}
if (!dontResetTrusted) {
// Check security state to determine if dispatcher is trusted
bool trusted = NS_IsMainThread()
? nsContentUtils::LegacyIsCallerChromeOrNativeCode()
: IsCurrentThreadRunningChromeWorker();
aDOMEvent->SetTrusted(trusted);
}
return EventDispatcher::Dispatch(aTarget, aPresContext, innerEvent,
aDOMEvent, aEventStatus);
} else if (aEvent) {
return EventDispatcher::Dispatch(aTarget, aPresContext, aEvent, aDOMEvent,
aEventStatus);
}
return NS_ERROR_ILLEGAL_VALUE;
}
/* static */ already_AddRefed<dom::Event> EventDispatcher::CreateEvent(
EventTarget* aOwner, nsPresContext* aPresContext, WidgetEvent* aEvent,
const nsAString& aEventType, CallerType aCallerType) {
if (aEvent) {
switch (aEvent->mClass) {
case eMutationEventClass:
return NS_NewDOMMutationEvent(aOwner, aPresContext,
aEvent->AsMutationEvent());
case eGUIEventClass:
case eScrollPortEventClass:
case eUIEventClass:
return NS_NewDOMUIEvent(aOwner, aPresContext, aEvent->AsGUIEvent());
case eScrollAreaEventClass:
return NS_NewDOMScrollAreaEvent(aOwner, aPresContext,
aEvent->AsScrollAreaEvent());
case eKeyboardEventClass:
return NS_NewDOMKeyboardEvent(aOwner, aPresContext,
aEvent->AsKeyboardEvent());
case eCompositionEventClass:
return NS_NewDOMCompositionEvent(aOwner, aPresContext,
aEvent->AsCompositionEvent());
case eMouseEventClass:
return NS_NewDOMMouseEvent(aOwner, aPresContext,
aEvent->AsMouseEvent());
case eFocusEventClass:
return NS_NewDOMFocusEvent(aOwner, aPresContext,
aEvent->AsFocusEvent());
case eMouseScrollEventClass:
return NS_NewDOMMouseScrollEvent(aOwner, aPresContext,
aEvent->AsMouseScrollEvent());
case eWheelEventClass:
return NS_NewDOMWheelEvent(aOwner, aPresContext,
aEvent->AsWheelEvent());
case eEditorInputEventClass:
return NS_NewDOMInputEvent(aOwner, aPresContext,
aEvent->AsEditorInputEvent());
case eDragEventClass:
return NS_NewDOMDragEvent(aOwner, aPresContext, aEvent->AsDragEvent());
case eClipboardEventClass:
return NS_NewDOMClipboardEvent(aOwner, aPresContext,
aEvent->AsClipboardEvent());
case eSMILTimeEventClass:
return NS_NewDOMTimeEvent(aOwner, aPresContext,
aEvent->AsSMILTimeEvent());
case eCommandEventClass:
return NS_NewDOMCommandEvent(aOwner, aPresContext,
aEvent->AsCommandEvent());
case eSimpleGestureEventClass:
return NS_NewDOMSimpleGestureEvent(aOwner, aPresContext,
aEvent->AsSimpleGestureEvent());
case ePointerEventClass:
return NS_NewDOMPointerEvent(aOwner, aPresContext,
aEvent->AsPointerEvent());
case eTouchEventClass:
return NS_NewDOMTouchEvent(aOwner, aPresContext,
aEvent->AsTouchEvent());
case eTransitionEventClass:
return NS_NewDOMTransitionEvent(aOwner, aPresContext,
aEvent->AsTransitionEvent());
case eAnimationEventClass:
return NS_NewDOMAnimationEvent(aOwner, aPresContext,
aEvent->AsAnimationEvent());
default:
// For all other types of events, create a vanilla event object.
return NS_NewDOMEvent(aOwner, aPresContext, aEvent);
}
}
// And if we didn't get an event, check the type argument.
if (aEventType.LowerCaseEqualsLiteral("mouseevent") ||
aEventType.LowerCaseEqualsLiteral("mouseevents")) {
return NS_NewDOMMouseEvent(aOwner, aPresContext, nullptr);
}
if (aEventType.LowerCaseEqualsLiteral("dragevent")) {
return NS_NewDOMDragEvent(aOwner, aPresContext, nullptr);
}
if (aEventType.LowerCaseEqualsLiteral("keyboardevent")) {
return NS_NewDOMKeyboardEvent(aOwner, aPresContext, nullptr);
}
if (aEventType.LowerCaseEqualsLiteral("compositionevent") ||
aEventType.LowerCaseEqualsLiteral("textevent")) {
return NS_NewDOMCompositionEvent(aOwner, aPresContext, nullptr);
}
if (aEventType.LowerCaseEqualsLiteral("mutationevent") ||
aEventType.LowerCaseEqualsLiteral("mutationevents")) {
return NS_NewDOMMutationEvent(aOwner, aPresContext, nullptr);
}
if (aEventType.LowerCaseEqualsLiteral("deviceorientationevent")) {
DeviceOrientationEventInit init;
RefPtr<Event> event =
DeviceOrientationEvent::Constructor(aOwner, u""_ns, init);
event->MarkUninitialized();
return event.forget();
}
if (aEventType.LowerCaseEqualsLiteral("devicemotionevent")) {
return NS_NewDOMDeviceMotionEvent(aOwner, aPresContext, nullptr);
}
if (aEventType.LowerCaseEqualsLiteral("uievent") ||
aEventType.LowerCaseEqualsLiteral("uievents")) {
return NS_NewDOMUIEvent(aOwner, aPresContext, nullptr);
}
if (aEventType.LowerCaseEqualsLiteral("event") ||
aEventType.LowerCaseEqualsLiteral("events") ||
aEventType.LowerCaseEqualsLiteral("htmlevents") ||
aEventType.LowerCaseEqualsLiteral("svgevents")) {
return NS_NewDOMEvent(aOwner, aPresContext, nullptr);
}
if (aEventType.LowerCaseEqualsLiteral("messageevent")) {
RefPtr<Event> event = new MessageEvent(aOwner, aPresContext, nullptr);
return event.forget();
}
if (aEventType.LowerCaseEqualsLiteral("beforeunloadevent")) {
return NS_NewDOMBeforeUnloadEvent(aOwner, aPresContext, nullptr);
}
if (aEventType.LowerCaseEqualsLiteral("touchevent") &&
TouchEvent::LegacyAPIEnabled(
nsContentUtils::GetDocShellForEventTarget(aOwner),
aCallerType == CallerType::System)) {
return NS_NewDOMTouchEvent(aOwner, aPresContext, nullptr);
}
if (aEventType.LowerCaseEqualsLiteral("hashchangeevent")) {
HashChangeEventInit init;
RefPtr<Event> event = HashChangeEvent::Constructor(aOwner, u""_ns, init);
event->MarkUninitialized();
return event.forget();
}
if (aEventType.LowerCaseEqualsLiteral("customevent")) {
return NS_NewDOMCustomEvent(aOwner, aPresContext, nullptr);
}
if (aEventType.LowerCaseEqualsLiteral("storageevent")) {
RefPtr<Event> event =
StorageEvent::Constructor(aOwner, u""_ns, StorageEventInit());
event->MarkUninitialized();
return event.forget();
}
if (aEventType.LowerCaseEqualsLiteral("focusevent")) {
RefPtr<Event> event = NS_NewDOMFocusEvent(aOwner, aPresContext, nullptr);
event->MarkUninitialized();
return event.forget();
}
// Only allow these events for chrome
if (aCallerType == CallerType::System) {
if (aEventType.LowerCaseEqualsLiteral("simplegestureevent")) {
return NS_NewDOMSimpleGestureEvent(aOwner, aPresContext, nullptr);
}
if (aEventType.LowerCaseEqualsLiteral("xulcommandevent") ||
aEventType.LowerCaseEqualsLiteral("xulcommandevents")) {
return NS_NewDOMXULCommandEvent(aOwner, aPresContext, nullptr);
}
}
// NEW EVENT TYPES SHOULD NOT BE ADDED HERE; THEY SHOULD USE ONLY EVENT
// CONSTRUCTORS
return nullptr;
}
struct CurrentTargetPathInfo {
uint32_t mIndex;
int32_t mHiddenSubtreeLevel;
};
static CurrentTargetPathInfo TargetPathInfo(
const nsTArray<EventTargetChainItem>& aEventPath,
const EventTarget& aCurrentTarget) {
int32_t currentTargetHiddenSubtreeLevel = 0;
for (uint32_t index = aEventPath.Length(); index--;) {
const EventTargetChainItem& item = aEventPath.ElementAt(index);
if (item.PreHandleEventOnly()) {
continue;
}
if (item.IsRootOfClosedTree()) {
currentTargetHiddenSubtreeLevel++;
}
if (item.CurrentTarget() == &aCurrentTarget) {
return {index, currentTargetHiddenSubtreeLevel};
}
if (item.IsSlotInClosedTree()) {
currentTargetHiddenSubtreeLevel--;
}
}
MOZ_ASSERT_UNREACHABLE("No target found?");
return {0, 0};
}
void EventDispatcher::GetComposedPathFor(WidgetEvent* aEvent,
nsTArray<RefPtr<EventTarget>>& aPath) {
MOZ_ASSERT(aPath.IsEmpty());
nsTArray<EventTargetChainItem>* path = aEvent->mPath;
if (!path || path->IsEmpty() || !aEvent->mCurrentTarget) {
return;
}
EventTarget* currentTarget =
aEvent->mCurrentTarget->GetTargetForEventTargetChain();
if (!currentTarget) {
return;
}
CurrentTargetPathInfo currentTargetInfo =
TargetPathInfo(*path, *currentTarget);
{
int32_t maxHiddenLevel = currentTargetInfo.mHiddenSubtreeLevel;
int32_t currentHiddenLevel = currentTargetInfo.mHiddenSubtreeLevel;
for (uint32_t index = currentTargetInfo.mIndex; index--;) {