| // 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. |
| |
| #include "chrome/browser/chromeos/camera_presence_notifier.h" |
| |
| #include "base/bind.h" |
| #include "base/memory/singleton.h" |
| #include "base/time/time.h" |
| #include "chrome/browser/chromeos/camera_detector.h" |
| |
| namespace chromeos { |
| |
| namespace { |
| |
| // Interval between checks for camera presence. |
| const int kCameraCheckIntervalSeconds = 3; |
| |
| } // namespace |
| |
| CameraPresenceNotifier::CameraPresenceNotifier() : |
| weak_factory_(this), |
| camera_present_on_last_check_(false) {} |
| |
| CameraPresenceNotifier::~CameraPresenceNotifier() {} |
| |
| // static |
| CameraPresenceNotifier* CameraPresenceNotifier::GetInstance() { |
| return Singleton<CameraPresenceNotifier>::get(); |
| } |
| |
| void CameraPresenceNotifier::AddObserver( |
| CameraPresenceNotifier::Observer* observer) { |
| bool had_no_observers = !observers_.might_have_observers(); |
| observers_.AddObserver(observer); |
| observer->OnCameraPresenceCheckDone(camera_present_on_last_check_); |
| if (had_no_observers) { |
| CheckCameraPresence(); |
| camera_check_timer_.Start( |
| FROM_HERE, |
| base::TimeDelta::FromSeconds(kCameraCheckIntervalSeconds), |
| this, |
| &CameraPresenceNotifier::CheckCameraPresence); |
| } |
| } |
| |
| void CameraPresenceNotifier::RemoveObserver( |
| CameraPresenceNotifier::Observer* observer) { |
| observers_.RemoveObserver(observer); |
| if (!observers_.might_have_observers()) { |
| camera_check_timer_.Stop(); |
| camera_present_on_last_check_ = false; |
| } |
| } |
| |
| void CameraPresenceNotifier::CheckCameraPresence() { |
| CameraDetector::StartPresenceCheck( |
| base::Bind(&CameraPresenceNotifier::OnCameraPresenceCheckDone, |
| weak_factory_.GetWeakPtr())); |
| } |
| |
| void CameraPresenceNotifier::OnCameraPresenceCheckDone() { |
| bool is_camera_present = |
| CameraDetector::camera_presence() == CameraDetector::kCameraPresent; |
| if (is_camera_present != camera_present_on_last_check_) { |
| camera_present_on_last_check_ = is_camera_present; |
| FOR_EACH_OBSERVER(Observer, |
| observers_, |
| OnCameraPresenceCheckDone(camera_present_on_last_check_)); |
| } |
| } |
| |
| } // namespace chromeos |