xref: /foundation/arkui/ui_lite/frameworks/components/ui_tree_manager.h

/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef GRAPHIC_LITE_UI_TREE_MANAGER_H
#define GRAPHIC_LITE_UI_TREE_MANAGER_H
#include "components/ui_view.h"
#include "gfx_utils/list.h"

namespace OHOS {

class UITreeManager final : public HeapBase {
public:
    static UITreeManager &GetInstance();

    enum ViewLifeEvent {
        ADD,
        REMOVE
    };
    using ViewFunc = void();
    void RegistViewLifeEvent(ViewFunc* func);
    void UnregistViewLifeEvent(ViewFunc* func);
    void GetLastEvent(UIView*& view, ViewLifeEvent& event);
    void OnLifeEvent(UIView*, ViewLifeEvent);

private:
    List<ViewFunc*> lifeEvents_;
    UIView* lastEventView_;
    ViewLifeEvent lastEvent_;
};
} // namespace OHOS
#endif