1 /* 2 * Copyright (c) 2024 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_PATTERNS_INDICATOR_EVENT_HUB_H 17 #define FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_INDICATOR_EVENT_HUB_H 18 19 namespace OHOS::Ace::NG { 20 21 using ChangeEvent = std::function<void(int32_t index)>; 22 using ChangeEventPtr = std::shared_ptr<ChangeEvent>; 23 24 class IndicatorEventHub : public EventHub { 25 DECLARE_ACE_TYPE(IndicatorEventHub, EventHub); 26 27 public: 28 IndicatorEventHub() = default; 29 ~IndicatorEventHub() override = default; 30 31 /* Using shared_ptr to enable event modification without adding again */ AddOnChangeEvent(const ChangeEventPtr & changeEvent)32 void AddOnChangeEvent(const ChangeEventPtr& changeEvent) 33 { 34 changeEvents_.emplace_back(changeEvent); 35 } 36 FireChangeEvent(int32_t index)37 void FireChangeEvent(int32_t index) const 38 { 39 if (!changeEvents_.empty()) { 40 std::for_each(changeEvents_.begin(), changeEvents_.end(), [index](const ChangeEventPtr& changeEvent) { 41 auto event = *changeEvent; 42 event(index); 43 }); 44 } 45 } 46 47 private: 48 std::list<ChangeEventPtr> changeEvents_; 49 }; 50 51 } // namespace OHOS::Ace::NG 52 53 #endif // FOUNDATION_ACE_FRAMEWORKS_CORE_COMPONENTS_NG_PATTERNS_INDICATOR_EVENT_HUB_H