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Reuse the same event object when dispatching bubbling/capturing phases instead of allocating new ones.

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ownedbywuigi 2026-03-27 11:57:41 +00:00
commit 8594600d9b
1 changed files with 40 additions and 14 deletions
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54
dom/events/EventDispatcher.cpp
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@ -489,7 +489,9 @@ EventTargetChainItem::HandleEventTargetChain(
uint32_t childIndex = j - 1;
EventTarget* newTarget = aChain[childIndex].GetNewTarget();
if (newTarget) {
aVisitor.mEvent->mTarget = newTarget;
if (aVisitor.mEvent->mTarget != newTarget) {
aVisitor.mEvent->mTarget = newTarget;
}
break;
}
}
@ -509,13 +511,18 @@ EventTargetChainItem::HandleEventTargetChain(
aChain[childIndex].GetRetargetedRelatedTarget();
if (relatedTarget) {
found = true;
aVisitor.mEvent->mRelatedTarget = relatedTarget;
if (aVisitor.mEvent->mRelatedTarget != relatedTarget) {
aVisitor.mEvent->mRelatedTarget = relatedTarget;
}
break;
}
}
if (!found) {
aVisitor.mEvent->mRelatedTarget =
aVisitor.mEvent->mOriginalRelatedTarget;
if (aVisitor.mEvent->mRelatedTarget !=
aVisitor.mEvent->mOriginalRelatedTarget) {
aVisitor.mEvent->mRelatedTarget =
aVisitor.mEvent->mOriginalRelatedTarget;
}
}
}
}
@ -541,7 +548,9 @@ EventTargetChainItem::HandleEventTargetChain(
if (newTarget) {
// Item is at anonymous boundary. Need to retarget for the current item
// and for parent items.
aVisitor.mEvent->mTarget = newTarget;
if (aVisitor.mEvent->mTarget != newTarget) {
aVisitor.mEvent->mTarget = newTarget;
}
}
// https://dom.spec.whatwg.org/#dispatching-events
@ -549,7 +558,9 @@ EventTargetChainItem::HandleEventTargetChain(
// "Set event's relatedTarget to tuple's relatedTarget."
EventTarget* relatedTarget = item.GetRetargetedRelatedTarget();
if (relatedTarget) {
aVisitor.mEvent->mRelatedTarget = relatedTarget;
if (aVisitor.mEvent->mRelatedTarget != relatedTarget) {
aVisitor.mEvent->mRelatedTarget = relatedTarget;
}
}
if (aVisitor.mEvent->mFlags.mBubbles || newTarget) {
@ -570,7 +581,9 @@ EventTargetChainItem::HandleEventTargetChain(
aVisitor.mEvent->mFlags.mImmediatePropagationStopped = false;
// Setting back the original target of the event.
aVisitor.mEvent->mTarget = aVisitor.mEvent->mOriginalTarget;
if (aVisitor.mEvent->mTarget != aVisitor.mEvent->mOriginalTarget) {
aVisitor.mEvent->mTarget = aVisitor.mEvent->mOriginalTarget;
}
// Special handling if PresShell (or some other caller)
// used a callback object.
@ -580,8 +593,13 @@ EventTargetChainItem::HandleEventTargetChain(
// 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 = aVisitor.mEvent->mOriginalRelatedTarget;
if (aVisitor.mEvent->mTarget != firstTarget) {
aVisitor.mEvent->mTarget = firstTarget;
}
if (aVisitor.mEvent->mRelatedTarget !=
aVisitor.mEvent->mOriginalRelatedTarget) {
aVisitor.mEvent->mRelatedTarget = aVisitor.mEvent->mOriginalRelatedTarget;
}
aVisitor.mEvent->mFlags.mInSystemGroup = true;
HandleEventTargetChain(aChain,
aVisitor,
@ -713,9 +731,11 @@ EventDispatcher::Dispatch(nsISupports* aTarget,
do_QueryInterface(content->FindFirstNonChromeOnlyAccessContent());
NS_ENSURE_STATE(newTarget);
aEvent->mOriginalTarget = target;
target = newTarget;
retargeted = true;
if (target != newTarget) {
aEvent->mOriginalTarget = target;
target = newTarget;
retargeted = true;
}
}
}
@ -860,12 +880,18 @@ EventDispatcher::Dispatch(nsISupports* aTarget,
// 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;
if (preVisitor.mEvent->mTarget != preVisitor.mEventTargetAtParent) {
preVisitor.mEvent->mTarget = preVisitor.mEventTargetAtParent;
}
parentEtci->SetNewTarget(preVisitor.mEventTargetAtParent);
}
if (preVisitor.mRetargetedRelatedTarget) {
preVisitor.mEvent->mRelatedTarget = preVisitor.mRetargetedRelatedTarget;
if (preVisitor.mEvent->mRelatedTarget !=
preVisitor.mRetargetedRelatedTarget) {
preVisitor.mEvent->mRelatedTarget =
preVisitor.mRetargetedRelatedTarget;
}
}
parentEtci->GetEventTargetParent(preVisitor);