| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CHROME_BROWSER_CHROMEOS_CAMERA_PRESENCE_NOTIFIER_H_ |
| #define CHROME_BROWSER_CHROMEOS_CAMERA_PRESENCE_NOTIFIER_H_ |
| |
| #include "base/memory/singleton.h" |
| #include "base/memory/weak_ptr.h" |
| #include "base/observer_list.h" |
| #include "base/timer/timer.h" |
| |
| namespace chromeos { |
| |
| // Camera presence status dispatcher. |
| class CameraPresenceNotifier { |
| public: |
| class Observer { |
| public: |
| virtual void OnCameraPresenceCheckDone(bool is_camera_present) = 0; |
| protected: |
| virtual ~Observer() {} |
| }; |
| |
| static CameraPresenceNotifier* GetInstance(); |
| |
| void AddObserver(CameraPresenceNotifier::Observer* observer); |
| void RemoveObserver(CameraPresenceNotifier::Observer* observer); |
| |
| private: |
| friend struct DefaultSingletonTraits<CameraPresenceNotifier>; |
| CameraPresenceNotifier(); |
| ~CameraPresenceNotifier(); |
| |
| void CheckCameraPresence(); |
| |
| // Sends out a camera presence status notification. |
| void OnCameraPresenceCheckDone(); |
| |
| base::WeakPtrFactory<CameraPresenceNotifier> weak_factory_; |
| |
| bool camera_present_on_last_check_; |
| |
| // Timer for camera check cycle. |
| base::RepeatingTimer<CameraPresenceNotifier> camera_check_timer_; |
| |
| ObserverList<Observer> observers_; |
| |
| DISALLOW_COPY_AND_ASSIGN(CameraPresenceNotifier); |
| }; |
| |
| } // namespace chromeos |
| |
| #endif // CHROME_BROWSER_CHROMEOS_CAMERA_PRESENCE_NOTIFIER_H_ |
| |