MsaaIdGenerator.h (1238B)
1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #ifndef mozilla_a11y_MsaaIdGenerator_h 8 #define mozilla_a11y_MsaaIdGenerator_h 9 10 #include "mozilla/a11y/IDSet.h" 11 12 #include "mozilla/NotNull.h" 13 #include "nsITimer.h" 14 15 namespace mozilla { 16 namespace a11y { 17 18 class MsaaAccessible; 19 20 /** 21 * This class is responsible for generating child IDs used by our MSAA 22 * implementation. 23 */ 24 class MsaaIdGenerator { 25 public: 26 uint32_t GetID(); 27 void ReleaseID(NotNull<MsaaAccessible*> aMsaaAcc); 28 29 private: 30 bool ReleaseID(uint32_t aID); 31 void ReleasePendingIDs(); 32 static void ReleasePendingIdsCallback(nsITimer* aTimer, void* aClosure); 33 34 private: 35 static constexpr uint32_t kNumFullIDBits = 31UL; 36 IDSet mIDSet{kNumFullIDBits}; 37 nsTArray<uint32_t> mIDsToRelease; 38 nsCOMPtr<nsITimer> mReleaseIDTimer; 39 // Whether GetID has been called yet this session. 40 bool mGetIDCalled = false; 41 }; 42 43 } // namespace a11y 44 } // namespace mozilla 45 46 #endif // mozilla_a11y_MsaaIdGenerator_h