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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /accessible/base/EventTree.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_a11y_EventTree_h_
+#define mozilla_a11y_EventTree_h_
+
+#include "AccEvent.h"
+#include "Accessible.h"
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+
+namespace mozilla {
+namespace a11y {
+
+/**
+ * This class makes sure required tasks are done before and after tree
+ * mutations. Currently this only includes group info invalidation. You must
+ * have an object of this class on the stack when calling methods that mutate
+ * the accessible tree.
+ */
+class TreeMutation final
+{
+public:
+ static const bool kNoEvents = true;
+ static const bool kNoShutdown = true;
+
+ explicit TreeMutation(Accessible* aParent, bool aNoEvents = false);
+ ~TreeMutation();
+
+ void AfterInsertion(Accessible* aChild);
+ void BeforeRemoval(Accessible* aChild, bool aNoShutdown = false);
+ void Done();
+
+private:
+ NotificationController* Controller() const
+ { return mParent->Document()->Controller(); }
+
+ static EventTree* const kNoEventTree;
+
+#ifdef A11Y_LOG
+ static const char* PrefixLog(void* aData, Accessible*);
+#endif
+
+ Accessible* mParent;
+ uint32_t mStartIdx;
+ uint32_t mStateFlagsCopy;
+
+ /*
+ * True if mutation events should be queued.
+ */
+ bool mQueueEvents;
+
+#ifdef DEBUG
+ bool mIsDone;
+#endif
+};
+
+
+/**
+ * A mutation events coalescence structure.
+ */
+class EventTree final {
+public:
+ EventTree() :
+ mFirst(nullptr), mNext(nullptr), mContainer(nullptr), mFireReorder(false) { }
+ explicit EventTree(Accessible* aContainer, bool aFireReorder) :
+ mFirst(nullptr), mNext(nullptr), mContainer(aContainer),
+ mFireReorder(aFireReorder) { }
+ ~EventTree() { Clear(); }
+
+ void Shown(Accessible* aTarget);
+ void Hidden(Accessible*, bool);
+
+ /**
+ * Return an event tree node for the given accessible.
+ */
+ const EventTree* Find(const Accessible* aContainer) const;
+
+ /**
+ * Add a mutation event to this event tree.
+ */
+ void Mutated(AccMutationEvent* aEv);
+
+#ifdef A11Y_LOG
+ void Log(uint32_t aLevel = UINT32_MAX) const;
+#endif
+
+private:
+ /**
+ * Processes the event queue and fires events.
+ */
+ void Process(const RefPtr<DocAccessible>& aDeathGrip);
+
+ /**
+ * Return an event subtree for the given accessible.
+ */
+ EventTree* FindOrInsert(Accessible* aContainer);
+
+ void Clear();
+
+ UniquePtr<EventTree> mFirst;
+ UniquePtr<EventTree> mNext;
+
+ Accessible* mContainer;
+ nsTArray<RefPtr<AccMutationEvent>> mDependentEvents;
+ bool mFireReorder;
+
+ static NotificationController* Controller(Accessible* aAcc)
+ { return aAcc->Document()->Controller(); }
+
+ friend class NotificationController;
+};
+
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif // mozilla_a11y_EventQueue_h_