зеркало из https://github.com/mozilla/gecko-dev.git
120 строки
2.8 KiB
C++
120 строки
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_a11y_EventTree_h_
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#define mozilla_a11y_EventTree_h_
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#include "AccEvent.h"
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#include "Accessible.h"
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#include "mozilla/RefPtr.h"
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#include "mozilla/UniquePtr.h"
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namespace mozilla {
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namespace a11y {
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/**
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* This class makes sure required tasks are done before and after tree
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* mutations. Currently this only includes group info invalidation. You must
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* have an object of this class on the stack when calling methods that mutate
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* the accessible tree.
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*/
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class TreeMutation final
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{
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public:
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static const bool kNoEvents = true;
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static const bool kNoShutdown = true;
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explicit TreeMutation(Accessible* aParent, bool aNoEvents = false);
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~TreeMutation();
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void AfterInsertion(Accessible* aChild);
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void BeforeRemoval(Accessible* aChild, bool aNoShutdown = false);
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void Done();
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private:
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NotificationController* Controller() const
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{ return mParent->Document()->Controller(); }
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static EventTree* const kNoEventTree;
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#ifdef A11Y_LOG
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static const char* PrefixLog(void* aData, Accessible*);
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#endif
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Accessible* mParent;
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uint32_t mStartIdx;
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uint32_t mStateFlagsCopy;
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EventTree* mEventTree;
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#ifdef DEBUG
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bool mIsDone;
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#endif
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};
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/**
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* A mutation events coalescence structure.
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*/
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class EventTree final {
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public:
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EventTree() :
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mFirst(nullptr), mNext(nullptr), mContainer(nullptr), mFireReorder(false) { }
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explicit EventTree(Accessible* aContainer, bool aFireReorder) :
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mFirst(nullptr), mNext(nullptr), mContainer(aContainer),
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mFireReorder(aFireReorder) { }
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~EventTree() { Clear(); }
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void Shown(Accessible* aChild)
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{
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RefPtr<AccShowEvent> ev = new AccShowEvent(aChild);
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Mutated(ev);
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}
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void Hidden(Accessible* aChild, bool aNeedsShutdown = true)
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{
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RefPtr<AccHideEvent> ev = new AccHideEvent(aChild, aNeedsShutdown);
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Mutated(ev);
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}
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/**
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* Return an event tree node for the given accessible.
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*/
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const EventTree* Find(const Accessible* aContainer) const;
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#ifdef A11Y_LOG
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void Log(uint32_t aLevel = UINT32_MAX) const;
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#endif
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private:
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/**
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* Processes the event queue and fires events.
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*/
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void Process(const RefPtr<DocAccessible>& aDeathGrip);
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/**
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* Return an event subtree for the given accessible.
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*/
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EventTree* FindOrInsert(Accessible* aContainer);
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void Mutated(AccMutationEvent* aEv);
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void Clear();
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UniquePtr<EventTree> mFirst;
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UniquePtr<EventTree> mNext;
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Accessible* mContainer;
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nsTArray<RefPtr<AccMutationEvent>> mDependentEvents;
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bool mFireReorder;
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friend class NotificationController;
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};
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} // namespace a11y
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} // namespace mozilla
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#endif // mozilla_a11y_EventQueue_h_
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