1 /* 2 * Copyright (c) 2021-2022 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 DEVICE_OBSERVER_H 17 #define DEVICE_OBSERVER_H 18 19 #include <cstdint> 20 #include <memory> 21 22 namespace OHOS { 23 namespace MMI { 24 class IDeviceObserver { 25 public: 26 IDeviceObserver() = default; 27 virtual ~IDeviceObserver() = default; 28 OnDeviceAdded(int32_t deviceId)29 virtual void OnDeviceAdded(int32_t deviceId) {} OnDeviceRemoved(int32_t deviceId)30 virtual void OnDeviceRemoved(int32_t deviceId) {} 31 virtual void UpdatePointerDevice(bool hasPointerDevice, bool isVisible, bool isHotPlug) = 0; 32 }; 33 } // namespace MMI 34 } // namespace OHOS 35 #endif // DEVICE_OBSERVER_H 36