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 META_INTERFACE_LOADERS_DYNAMIC_CONTENT_LOADER_H 17 #define META_INTERFACE_LOADERS_DYNAMIC_CONTENT_LOADER_H 18 19 #include <meta/interface/interface_macros.h> 20 #include <meta/interface/property/property_events.h> 21 22 #include "intf_content_loader.h" 23 24 META_BEGIN_NAMESPACE() 25 26 META_REGISTER_INTERFACE(IDynamicContentLoader, "273e318f-6edc-423c-b27d-f842c48cac8d") 27 28 /** 29 * @brief The IDynamicContentLoader interface defines an interface for content loaders 30 * whose content can change at runtime. 31 * 32 * For example, a content loader which loads its content from a file can implement 33 * IDynamicContentLoader to inform its users of a change in the content returned 34 * by Create() call. 35 * 36 */ 37 class IDynamicContentLoader : public IContentLoader { 38 META_INTERFACE(IContentLoader, IDynamicContentLoader) 39 public: 40 /** 41 * @brief ContentChanged event is invoked when the content created by this content loader 42 * has changed. 43 * 44 * If the users want to stay up to date, they should call Create() again after 45 * ContentChanged event has been invoked. 46 */ 47 META_EVENT(IOnChanged, ContentChanged) 48 49 /** 50 * @brief Reload content loaded by this content loader. Causes ContentChanged event to 51 * be invoked. 52 */ 53 virtual void Reload() = 0; 54 }; 55 56 META_END_NAMESPACE() 57 58 #endif 59