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_INOTIFY_ON_CHANGE_H
17 #define META_INTERFACE_INOTIFY_ON_CHANGE_H
18 
19 #include <meta/base/types.h>
20 #include <meta/interface/event.h>
21 
22 META_BEGIN_NAMESPACE()
23 
24 META_REGISTER_INTERFACE(INotifyOnChange, "32de3870-a07d-4998-b563-2d24a5328df3")
25 
26 /**
27  * @brief State change notification interface
28  */
29 class INotifyOnChange : public CORE_NS::IInterface {
30     META_INTERFACE(CORE_NS::IInterface, INotifyOnChange)
31 public:
32     /**
33      * @brief Event for notifying about state change.
34      */
35     // META_EVENT(IEvent, OnChanged)
36     virtual BASE_NS::shared_ptr<IEvent> EventOnChanged() const = 0;
OnChanged()37     Event<IEvent> OnChanged() const
38     {
39         return EventOnChanged();
40     }
41 };
42 
43 META_END_NAMESPACE()
44 
45 #endif
46