зеркало из https://github.com/mozilla/gecko-dev.git
129 строки
3.0 KiB
C++
129 строки
3.0 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 "LocalAccessible.h"
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#include "mozilla/a11y/DocAccessible.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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class NotificationController;
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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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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(LocalAccessible* aParent, bool aNoEvents = false);
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~TreeMutation();
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void AfterInsertion(LocalAccessible* aChild);
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void BeforeRemoval(LocalAccessible* 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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}
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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, LocalAccessible*);
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#endif
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LocalAccessible* mParent;
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uint32_t mStartIdx;
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uint32_t mStateFlagsCopy;
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/*
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* True if mutation events should be queued.
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*/
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bool mQueueEvents;
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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),
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mNext(nullptr),
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mContainer(nullptr),
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mFireReorder(false) {}
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explicit EventTree(LocalAccessible* aContainer, bool aFireReorder)
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: mFirst(nullptr),
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mNext(nullptr),
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mContainer(aContainer),
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mFireReorder(aFireReorder) {}
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~EventTree() { Clear(); }
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void Shown(LocalAccessible* aTarget);
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void Hidden(LocalAccessible*, bool);
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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 LocalAccessible* aContainer) const;
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/**
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* Add a mutation event to this event tree.
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*/
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void Mutated(AccMutationEvent* aEv);
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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(LocalAccessible* aContainer);
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void Clear();
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UniquePtr<EventTree> mFirst;
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UniquePtr<EventTree> mNext;
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LocalAccessible* mContainer;
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nsTArray<RefPtr<AccMutationEvent>> mDependentEvents;
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bool mFireReorder;
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static NotificationController* Controller(LocalAccessible* aAcc) {
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return aAcc->Document()->Controller();
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}
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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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