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_FOREACH_LAZY_FOR_EACH_BUILDER_H 17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_SYNTAX_FOREACH_LAZY_FOR_EACH_BUILDER_H 18 19 #include <cstdint> 20 #include <map> 21 #include <optional> 22 #include <string> 23 #include <unordered_map> 24 #include <utility> 25 26 #include "base/log/ace_trace.h" 27 #include "base/utils/noncopyable.h" 28 #include "core/components_ng/base/ui_node.h" 29 #include "core/components_v2/foreach/lazy_foreach_component.h" 30 31 namespace OHOS::Ace::NG { 32 33 class ACE_EXPORT LazyForEachBuilder : public virtual AceType { 34 DECLARE_ACE_TYPE(NG::LazyForEachBuilder, AceType) 35 public: 36 LazyForEachBuilder() = default; 37 ~LazyForEachBuilder() override = default; 38 GetTotalCount()39 int32_t GetTotalCount() 40 { 41 return OnGetTotalCount(); 42 } 43 CreateChildByIndex(int32_t index)44 std::pair<std::string, RefPtr<UINode>> CreateChildByIndex(int32_t index) 45 { 46 { 47 ACE_SCOPED_TRACE("Builder:BuildLazyItem [%d]", index); 48 auto itemInfo = OnGetChildByIndex(index, generatedItem_); 49 CHECK_NULL_RETURN(itemInfo.second, itemInfo); 50 auto result = generatedItem_.try_emplace(itemInfo.first, itemInfo.second); 51 if (!result.second) { 52 LOGD("already has same key %{private}s child", itemInfo.first.c_str()); 53 } 54 return *(result.first); 55 } 56 } 57 GetChildByKey(const std::string & key)58 RefPtr<UINode> GetChildByKey(const std::string& key) 59 { 60 auto iter = generatedItem_.find(key); 61 if (iter != generatedItem_.end()) { 62 return iter->second; 63 } 64 return nullptr; 65 } 66 UpdateCachedItems(const std::list<std::optional<std::string>> & nodeIds,std::unordered_map<int32_t,std::optional<std::string>> && cachedItems)67 void UpdateCachedItems(const std::list<std::optional<std::string>>& nodeIds, 68 std::unordered_map<int32_t, std::optional<std::string>>&& cachedItems) 69 { 70 // use active ids to update cached items. 71 std::unordered_map<std::string, RefPtr<UINode>> generatedItem; 72 std::swap(generatedItem, generatedItem_); 73 for (const auto& id : nodeIds) { 74 if (!id) { 75 continue; 76 } 77 auto iter = generatedItem.find(*id); 78 if (iter != generatedItem.end()) { 79 generatedItem_.try_emplace(iter->first, iter->second); 80 generatedItem.erase(iter); 81 } 82 } 83 // store cached items. 84 for (auto& [index, id] : cachedItems) { 85 if (!id) { 86 // get id from old cachedItems which stores the idle task generate result. 87 auto iter = cachedItems_.find(index); 88 if (iter == cachedItems_.end()) { 89 continue; 90 } 91 id = iter->second; 92 } 93 if (id) { 94 auto iter = generatedItem.find(*id); 95 if (iter != generatedItem.end()) { 96 iter->second->SetActive(false); 97 generatedItem_.try_emplace(iter->first, iter->second); 98 } 99 } 100 } 101 std::swap(cachedItems_, cachedItems); 102 LOGD("LazyForEach cached size : %{public}d", static_cast<int32_t>(generatedItem_.size())); 103 } 104 SetCacheItemInfo(int32_t index,const std::string & info)105 void SetCacheItemInfo(int32_t index, const std::string& info) 106 { 107 cachedItems_[index] = info; 108 } 109 GetCacheItemInfo(int32_t index)110 std::optional<std::string> GetCacheItemInfo(int32_t index) const 111 { 112 auto iter = cachedItems_.find(index); 113 if (iter != cachedItems_.end()) { 114 return iter->second; 115 } 116 return std::nullopt; 117 } 118 Clean()119 void Clean() 120 { 121 generatedItem_.clear(); 122 } 123 RemoveChild(const std::string & id)124 void RemoveChild(const std::string& id) 125 { 126 generatedItem_.erase(id); 127 } 128 ExpandChildrenOnInitial()129 void ExpandChildrenOnInitial() 130 { 131 OnExpandChildrenOnInitialInNG(); 132 } 133 134 virtual void ReleaseChildGroupById(const std::string& id) = 0; 135 virtual void RegisterDataChangeListener(const RefPtr<V2::DataChangeListener>& listener) = 0; 136 virtual void UnregisterDataChangeListener(const RefPtr<V2::DataChangeListener>& listener) = 0; 137 138 protected: 139 virtual int32_t OnGetTotalCount() = 0; 140 virtual std::pair<std::string, RefPtr<UINode>> OnGetChildByIndex( 141 int32_t index, const std::unordered_map<std::string, RefPtr<UINode>>& cachedItems) = 0; 142 virtual void OnExpandChildrenOnInitialInNG() = 0; 143 144 private: 145 // [key, UINode] 146 std::unordered_map<std::string, RefPtr<UINode>> generatedItem_; 147 // [index, key] 148 std::unordered_map<int32_t, std::optional<std::string>> cachedItems_; 149 150 ACE_DISALLOW_COPY_AND_MOVE(LazyForEachBuilder); 151 }; 152 } // namespace OHOS::Ace::NG 153 154 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_SYNTAX_FOREACH_LAZY_FOR_EACH_BUILDER_H 155