EventTree.h (1513B)
1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* This Source Code Form is subject to the terms of the Mozilla Public 3 * License, v. 2.0. If a copy of the MPL was not distributed with this 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 5 6 #ifndef mozilla_a11y_EventTree_h_ 7 #define mozilla_a11y_EventTree_h_ 8 9 #include "AccEvent.h" 10 #include "LocalAccessible.h" 11 12 #include "mozilla/a11y/DocAccessible.h" 13 14 namespace mozilla { 15 namespace a11y { 16 17 class NotificationController; 18 19 /** 20 * This class makes sure required tasks are done before and after tree 21 * mutations. Currently this only includes group info invalidation. You must 22 * have an object of this class on the stack when calling methods that mutate 23 * the accessible tree. 24 */ 25 class TreeMutation final { 26 public: 27 static const bool kNoEvents = true; 28 static const bool kNoShutdown = true; 29 30 explicit TreeMutation(LocalAccessible* aParent, bool aNoEvents = false); 31 ~TreeMutation(); 32 33 void AfterInsertion(LocalAccessible* aChild); 34 void BeforeRemoval(LocalAccessible* aChild, bool aNoShutdown = false); 35 void Done(); 36 37 private: 38 NotificationController* Controller() const { 39 return mParent->Document()->Controller(); 40 } 41 42 LocalAccessible* mParent; 43 uint32_t mStartIdx; 44 uint32_t mStateFlagsCopy; 45 46 /* 47 * True if mutation events should be queued. 48 */ 49 bool mQueueEvents; 50 51 #ifdef DEBUG 52 bool mIsDone; 53 #endif 54 }; 55 56 } // namespace a11y 57 } // namespace mozilla 58 59 #endif // mozilla_a11y_EventQueue_h_