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// 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_
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