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-rw-r--r--accessible/base/EventTree.h61
1 files changed, 61 insertions, 0 deletions
diff --git a/accessible/base/EventTree.h b/accessible/base/EventTree.h
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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 "LocalAccessible.h"
+
+#include "mozilla/a11y/DocAccessible.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/UniquePtr.h"
+
+namespace mozilla {
+namespace a11y {
+
+class NotificationController;
+
+/**
+ * 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(LocalAccessible* aParent, bool aNoEvents = false);
+ ~TreeMutation();
+
+ void AfterInsertion(LocalAccessible* aChild);
+ void BeforeRemoval(LocalAccessible* aChild, bool aNoShutdown = false);
+ void Done();
+
+ private:
+ NotificationController* Controller() const {
+ return mParent->Document()->Controller();
+ }
+
+ LocalAccessible* mParent;
+ uint32_t mStartIdx;
+ uint32_t mStateFlagsCopy;
+
+ /*
+ * True if mutation events should be queued.
+ */
+ bool mQueueEvents;
+
+#ifdef DEBUG
+ bool mIsDone;
+#endif
+};
+
+} // namespace a11y
+} // namespace mozilla
+
+#endif // mozilla_a11y_EventQueue_h_