1 /* 2 * Copyright (c) 2022 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef GRAPHIC_LITE_UI_TREE_MANAGER_H 17 #define GRAPHIC_LITE_UI_TREE_MANAGER_H 18 #include "components/ui_view.h" 19 #include "gfx_utils/list.h" 20 21 namespace OHOS { 22 23 class UITreeManager final : public HeapBase { 24 public: 25 static UITreeManager &GetInstance(); 26 27 enum ViewLifeEvent { 28 ADD, 29 REMOVE 30 }; 31 using ViewFunc = void(); 32 void RegistViewLifeEvent(ViewFunc* func); 33 void UnregistViewLifeEvent(ViewFunc* func); 34 void GetLastEvent(UIView*& view, ViewLifeEvent& event); 35 void OnLifeEvent(UIView*, ViewLifeEvent); 36 37 private: 38 List<ViewFunc*> lifeEvents_; 39 UIView* lastEventView_; 40 ViewLifeEvent lastEvent_; 41 }; 42 } // namespace OHOS 43 #endif 44