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Bug 1305458 - Changing -moz-appearence on hover breaks change event

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* Rename nsIDOMEventTarget::PreHandleEvent to nsIDOMEventTarget::GetEventTargetParent
* Add nsIDOMEventTarget::PreHandleEvent
* Add EventTargetChainItem::GetFirstEventTarget
* Call EventTargetChainItem::PreHandleEvent even it sets mCanHandle=false
* Move form control frame focus/blur from nsGenericHTMLFormElement::GetEventTargetParent to PreHandleEvent
* Move fire change event from HTMLTextAreaElement::GetEventTargetParent to PreHandleEvent
* Refine nsXULElement::GetEventTargetParent
* Move dispatch XUL command from nsXULElement::GetEventTargetParent to PreHandleEvent
* Move fire events and set value from HTMLInputElement::GetEventTargetParent to PreHandleEvent
* Add test case
* Let HTMLInputElement delegate event handling to it's parent class
* Refine EventTargetChain flags to reduce overheads
* Refine event target chain creation
* Refine assertion in EventTargetChainItem::Create

Tag #1375
This commit is contained in:
Matt A. Tobin 2020-04-14 21:24:51 -04:00 • committed by Roy Tam
commit cb2b45e472
70 changed files with 547 additions and 258 deletions
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24
dom/events/EventDispatcher.h
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@ -31,14 +31,14 @@ class EventTarget;
* About event dispatching:
* When either EventDispatcher::Dispatch or
* EventDispatcher::DispatchDOMEvent is called an event target chain is
* created. EventDispatcher creates the chain by calling PreHandleEvent
* created. EventDispatcher creates the chain by calling GetEventTargetParent
* on each event target and the creation continues until either the mCanHandle
* member of the EventChainPreVisitor object is false or the mParentTarget
* does not point to a new target. The event target chain is created in the
* heap.
*
* If the event needs retargeting, mEventTargetAtParent must be set in
* PreHandleEvent.
* GetEventTargetParent.
*
* The capture, target and bubble phases of the event dispatch are handled
* by iterating through the event target chain. Iteration happens twice,
@ -86,7 +86,7 @@ public:
/**
* Bits for items in the event target chain.
* Set in PreHandleEvent() and used in PostHandleEvent().
* Set in GetEventTargetParent() and used in PostHandleEvent().
*
* @note These bits are different for each item in the event target chain.
* It is up to the Pre/PostHandleEvent implementation to decide how to
@ -98,7 +98,7 @@ public:
/**
* Data for items in the event target chain.
* Set in PreHandleEvent() and used in PostHandleEvent().
* Set in GetEventTargetParent() and used in PostHandleEvent().
*
* @note This data is different for each item in the event target chain.
* It is up to the Pre/PostHandleEvent implementation to decide how to
@ -123,6 +123,7 @@ public:
, mOriginalTargetIsInAnon(aIsInAnon)
, mWantsWillHandleEvent(false)
, mMayHaveListenerManager(true)
, mWantsPreHandleEvent(false)
, mParentTarget(nullptr)
, mEventTargetAtParent(nullptr)
{
@ -137,13 +138,14 @@ public:
mForceContentDispatch = false;
mWantsWillHandleEvent = false;
mMayHaveListenerManager = true;
mWantsPreHandleEvent = false;
mParentTarget = nullptr;
mEventTargetAtParent = nullptr;
}
/**
* Member that must be set in PreHandleEvent by event targets. If set to false,
* indicates that this event target will not be handling the event and
* Member that must be set in GetEventTargetParent by event targets. If set to
* false, indicates that this event target will not be handling the event and
* construction of the event target chain is complete. The target that sets
* mCanHandle to false is NOT included in the event target chain.
*/
@ -170,7 +172,7 @@ public:
/**
* true if the original target of the event is inside anonymous content.
* This is set before calling PreHandleEvent on event targets.
* This is set before calling GetEventTargetParent on event targets.
*/
bool mOriginalTargetIsInAnon;
@ -182,10 +184,16 @@ public:
/**
* If it is known that the current target doesn't have a listener manager
* when PreHandleEvent is called, set this to false.
* when GetEventTargetParent is called, set this to false.
*/
bool mMayHaveListenerManager;
/**
* Whether or not nsIDOMEventTarget::PreHandleEvent will be called. Default is
* false;
*/
bool mWantsPreHandleEvent;
/**
* Parent item in the event target chain.
*/