| // 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 <memory> |
| #include <string> |
| |
| #include "base/component_export.h" |
| #include "base/macros.h" |
| #include "base/observer_list.h" |
| #include "base/values.h" |
| #include "chromeos/audio/audio_devices_pref_handler.h" |
| #include "components/prefs/pref_change_registrar.h" |
| |
| class PrefRegistrySimple; |
| class PrefService; |
| |
| namespace chromeos { |
| |
| // Class which implements AudioDevicesPrefHandler interface and register audio |
| // preferences as well. |
| class COMPONENT_EXPORT(CHROMEOS_AUDIO) 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; |
| |
| void SetDeviceActive(const AudioDevice& device, |
| bool active, |
| bool activate_by_user) override; |
| bool GetDeviceActive(const AudioDevice& device, |
| bool* active, |
| bool* activate_by_user) 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(); |
| |
| // Load and save methods for the mute preferences for all devices. |
| void LoadDevicesMutePref(); |
| void SaveDevicesMutePref(); |
| |
| // Load and save methods for the volume preferences for all devices. |
| void LoadDevicesVolumePref(); |
| void SaveDevicesVolumePref(); |
| |
| // Load and save methods for the active state for all devices. |
| void LoadDevicesStatePref(); |
| void SaveDevicesStatePref(); |
| |
| double GetVolumeGainPrefValue(const AudioDevice& device); |
| double GetDeviceDefaultOutputVolume(const AudioDevice& device); |
| |
| // Migrates devices state pref for an audio device. Device settings are |
| // saved under device stable device ID - this method migrates device state |
| // for a device that is saved under key derived from v1 stable device ID to |
| // |device_key|. Note that |device_key| should be the key derived from |
| // |device|'s v2 stable device ID. |
| bool MigrateDevicesStatePref(const std::string& device_key, |
| const AudioDevice& device); |
| |
| // Methods to migrate the mute and volume settings for an audio device. |
| // Migration is done in the folowing way: |
| // 1. If there is a setting for the device under |device_key|, do nothing. |
| // (Note that |device_key| is expected to be the key derived from |
| // |device's| v2 stable device ID). |
| // 2. If there is a setting for the device under the key derived from |
| // |device|'s v1 stable device ID, move the value to |device_key|. |
| // 3. If a previous global pref value exists, move it to the per device |
| // setting (under |device_key|). |
| // 4. If a previous global setting is not set, use default values of |
| // mute = off and volume = 75%. |
| void MigrateDeviceMuteSettings(const std::string& device_key, |
| const AudioDevice& device); |
| void MigrateDeviceVolumeGainSettings(const std::string& device_key, |
| const AudioDevice& device); |
| |
| // Notifies the AudioPrefObserver for audio policy pref changes. |
| void NotifyAudioPolicyChange(); |
| |
| std::unique_ptr<base::DictionaryValue> device_mute_settings_; |
| std::unique_ptr<base::DictionaryValue> device_volume_settings_; |
| std::unique_ptr<base::DictionaryValue> device_state_settings_; |
| |
| PrefService* local_state_; // not owned |
| |
| PrefChangeRegistrar pref_change_registrar_; |
| base::ObserverList<AudioPrefObserver>::Unchecked observers_; |
| |
| DISALLOW_COPY_AND_ASSIGN(AudioDevicesPrefHandlerImpl); |
| }; |
| |
| } // namespace chromeos |
| |
| #endif // CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_IMPL_H_ |