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 FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_SYNTAX_LAZY_FOR_EACH_NODE_H 17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_SYNTAX_LAZY_FOR_EACH_NODE_H 18 19 #include <list> 20 #include <optional> 21 #include <stdint.h> 22 #include <string> 23 #include <unordered_set> 24 #include <utility> 25 26 #include "base/utils/utils.h" 27 #include "core/components_ng/base/frame_node.h" 28 #include "core/components_ng/base/ui_node.h" 29 #include "core/components_ng/syntax/lazy_for_each_builder.h" 30 #include "core/components_v2/inspector/inspector_constants.h" 31 32 namespace OHOS::Ace::NG { 33 34 class ACE_EXPORT LazyForEachNode : public UINode, public V2::DataChangeListener { 35 DECLARE_ACE_TYPE(LazyForEachNode, UINode); 36 37 public: 38 static RefPtr<LazyForEachNode> GetOrCreateLazyForEachNode( 39 int32_t nodeId, const RefPtr<LazyForEachBuilder>& forEachBuilder); 40 LazyForEachNode(int32_t nodeId,const RefPtr<LazyForEachBuilder> & forEachBuilder)41 LazyForEachNode(int32_t nodeId, const RefPtr<LazyForEachBuilder>& forEachBuilder) 42 : UINode(V2::JS_LAZY_FOR_EACH_ETS_TAG, nodeId, false), builder_(forEachBuilder) 43 {} 44 45 ~LazyForEachNode() override = default; 46 IsAtomicNode()47 bool IsAtomicNode() const override 48 { 49 return false; 50 } 51 FrameCount()52 int32_t FrameCount() const override 53 { 54 return builder_ ? builder_->GetTotalCount() : 0; 55 } 56 57 void AdjustLayoutWrapperTree(const RefPtr<LayoutWrapper>& parent, bool forceMeasure, bool forceLayout) override; 58 59 void UpdateLazyForEachItems(int32_t newStartIndex, int32_t newEndIndex, 60 std::list<std::optional<std::string>>&& nodeIds, 61 std::unordered_map<int32_t, std::optional<std::string>>&& cachedItems); 62 63 void OnDataReloaded() override; 64 void OnDataAdded(size_t index) override; 65 void OnDataDeleted(size_t index) override; 66 void OnDataChanged(size_t index) override; 67 void OnDataMoved(size_t from, size_t to) override; 68 69 void PostIdleTask(std::list<int32_t>&& items); 70 71 private: OnAttachToMainTree()72 void OnAttachToMainTree() override 73 { 74 CHECK_NULL_VOID(builder_); 75 builder_->RegisterDataChangeListener(Claim(this)); 76 } 77 OnDetachFromMainTree()78 void OnDetachFromMainTree() override 79 { 80 CHECK_NULL_VOID(builder_); 81 builder_->UnregisterDataChangeListener(Claim(this)); 82 } 83 84 void NotifyDataCountChanged(size_t index); 85 86 // The index values of the start and end of the current children nodes and the corresponding keys. 87 int32_t startIndex_ = -1; 88 int32_t endIndex_ = -1; 89 std::list<std::optional<std::string>> ids_; 90 std::list<int32_t> predictItems_; 91 bool needPredict = false; 92 93 RefPtr<LazyForEachBuilder> builder_; 94 95 ACE_DISALLOW_COPY_AND_MOVE(LazyForEachNode); 96 }; 97 98 } // namespace OHOS::Ace::NG 99 100 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_SYNTAX_LAZY_FOR_EACH_NODE_H 101