1 /* 2 * Copyright (c) 2025 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 FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_SCROLL_LAZY_COMPOSE_ADAPTER_H 17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_SCROLL_LAZY_COMPOSE_ADAPTER_H 18 #include <cstdint> 19 #include <functional> 20 21 #include "base/memory/referenced.h" 22 #include "base/utils/unique_valued_map.h" 23 24 namespace OHOS::Ace::NG { 25 class FrameNode; 26 27 /** 28 * @brief Adapter to access and manage lazy items in Arkoala frontend 29 * 30 */ 31 class LazyComposeAdapter { 32 public: 33 using CreateItemCb = std::function<RefPtr<FrameNode>(int32_t)>; 34 using UpdateRangeCb = std::function<void(int32_t, int32_t)>; 35 SetTotalCount(int32_t value)36 void SetTotalCount(int32_t value) 37 { 38 totalCount_ = value; 39 } 40 GetTotalCount()41 int32_t GetTotalCount() const 42 { 43 return totalCount_; 44 } 45 46 void SetCallbacks(CreateItemCb create, UpdateRangeCb update); 47 48 RefPtr<FrameNode> GetOrCreateChild(uint32_t index); 49 RefPtr<FrameNode> GetChild(uint32_t index); 50 51 uint32_t GetIndexOfChild(const RefPtr<FrameNode>& child); 52 53 void SetActiveRange(int32_t start, int32_t end); 54 55 void OnDataChange(int32_t changeIndex); 56 57 private: 58 UniqueValuedMap<uint32_t, WeakPtr<FrameNode>, WeakPtr<FrameNode>::Hash> items_; 59 CreateItemCb createItem_; 60 UpdateRangeCb updateRange_; 61 int32_t totalCount_ = 0; 62 }; 63 } // namespace OHOS::Ace::NG 64 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_SCROLL_LAZY_COMPOSE_ADAPTER_H 65