| // Copyright (c) 2013 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 CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_IMPL_H_ |
| #define CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_IMPL_H_ |
| |
| #include <string> |
| |
| #include "base/observer_list.h" |
| #include "base/prefs/pref_change_registrar.h" |
| #include "base/values.h" |
| #include "chromeos/audio/audio_devices_pref_handler.h" |
| #include "chromeos/chromeos_export.h" |
| |
| class PrefRegistrySimple; |
| class PrefService; |
| |
| namespace chromeos { |
| |
| // Class which implements AudioDevicesPrefHandler interface and register audio |
| // preferences as well. |
| class CHROMEOS_EXPORT AudioDevicesPrefHandlerImpl |
| : public AudioDevicesPrefHandler { |
| public: |
| // |local_state| is the device-wide preference service. |
| explicit AudioDevicesPrefHandlerImpl(PrefService* local_state); |
| |
| // Overridden from AudioDevicesPrefHandler. |
| double GetOutputVolumeValue(const AudioDevice* device) override; |
| double GetInputGainValue(const AudioDevice* device) override; |
| void SetVolumeGainValue(const AudioDevice& device, double value) override; |
| |
| bool GetMuteValue(const AudioDevice& device) override; |
| void SetMuteValue(const AudioDevice& device, bool mute_on) override; |
| |
| bool GetAudioOutputAllowedValue() override; |
| |
| void AddAudioPrefObserver(AudioPrefObserver* observer) override; |
| void RemoveAudioPrefObserver(AudioPrefObserver* observer) override; |
| |
| // Registers volume and mute preferences. |
| static void RegisterPrefs(PrefRegistrySimple* registry); |
| |
| protected: |
| ~AudioDevicesPrefHandlerImpl() override; |
| |
| private: |
| // Initializes the observers for the policy prefs. |
| void InitializePrefObservers(); |
| |
| // Update and save methods for the mute preferences for all devices. |
| void UpdateDevicesMutePref(); |
| void SaveDevicesMutePref(); |
| |
| // Update and save methods for the volume preferences for all devices. |
| void UpdateDevicesVolumePref(); |
| void SaveDevicesVolumePref(); |
| |
| double GetVolumeGainPrefValue(const AudioDevice& device); |
| double GetDeviceDefaultOutputVolume(const AudioDevice& device); |
| |
| // Methods to migrate the mute and volume settings for a device from the |
| // previous global pref value to the new per device pref value for the |
| // current active device. If a previous global setting doesn't exist, we'll |
| // use default values of mute = off and volume = 75%. |
| void MigrateDeviceMuteSettings(const std::string& active_device); |
| void MigrateDeviceVolumeSettings(const std::string& active_device); |
| |
| // Notifies the AudioPrefObserver for audio policy pref changes. |
| void NotifyAudioPolicyChange(); |
| |
| scoped_ptr<base::DictionaryValue> device_mute_settings_; |
| scoped_ptr<base::DictionaryValue> device_volume_settings_; |
| |
| PrefService* local_state_; // not owned |
| |
| PrefChangeRegistrar pref_change_registrar_; |
| base::ObserverList<AudioPrefObserver> observers_; |
| |
| DISALLOW_COPY_AND_ASSIGN(AudioDevicesPrefHandlerImpl); |
| }; |
| |
| } // namespace chromeos |
| |
| #endif // CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_IMPL_H_ |