1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_IMPL_H_ 6 #define CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_IMPL_H_ 7 8 #include "base/observer_list.h" 9 #include "base/prefs/pref_change_registrar.h" 10 #include "base/values.h" 11 #include "chromeos/audio/audio_devices_pref_handler.h" 12 13 class PrefRegistrySimple; 14 class PrefService; 15 16 namespace chromeos { 17 18 // Class which implements AudioDevicesPrefHandler interface and register audio 19 // preferences as well. 20 class AudioDevicesPrefHandlerImpl : public AudioDevicesPrefHandler { 21 public: 22 explicit AudioDevicesPrefHandlerImpl(PrefService* local_state); 23 24 // Overridden from AudioDevicesPrefHandler. 25 virtual double GetOutputVolumeValue(const AudioDevice* device) OVERRIDE; 26 virtual double GetInputGainValue(const AudioDevice* device) OVERRIDE; 27 virtual void SetVolumeGainValue(const AudioDevice& device, 28 double value) OVERRIDE; 29 30 virtual bool GetMuteValue(const AudioDevice& device) OVERRIDE; 31 virtual void SetMuteValue(const AudioDevice& device, bool mute_on) OVERRIDE; 32 33 virtual bool GetAudioCaptureAllowedValue() OVERRIDE; 34 virtual bool GetAudioOutputAllowedValue() OVERRIDE; 35 36 virtual void AddAudioPrefObserver(AudioPrefObserver* observer) OVERRIDE; 37 virtual void RemoveAudioPrefObserver(AudioPrefObserver* observer) OVERRIDE; 38 39 // Registers volume and mute preferences. 40 static void RegisterPrefs(PrefRegistrySimple* registry); 41 42 protected: 43 virtual ~AudioDevicesPrefHandlerImpl(); 44 45 private: 46 // Initializes the observers for the policy prefs. 47 void InitializePrefObservers(); 48 49 // Update and save methods for the mute preferences for all devices. 50 void UpdateDevicesMutePref(); 51 void SaveDevicesMutePref(); 52 53 // Update and save methods for the volume preferences for all devices. 54 void UpdateDevicesVolumePref(); 55 void SaveDevicesVolumePref(); 56 57 double GetVolumeGainPrefValue(const AudioDevice& device); 58 double GetDeviceDefaultOutputVolume(const AudioDevice& device); 59 60 // Methods to migrate the mute and volume settings for a device from the 61 // previous global pref value to the new per device pref value for the 62 // current active device. If a previous global setting doesn't exist, we'll 63 // use default values of mute = off and volume = 75%. 64 void MigrateDeviceMuteSettings(std::string active_device); 65 void MigrateDeviceVolumeSettings(std::string active_device); 66 67 // Notifies the AudioPrefObserver for audio policy pref changes. 68 void NotifyAudioPolicyChange(); 69 70 scoped_ptr<base::DictionaryValue> device_mute_settings_; 71 scoped_ptr<base::DictionaryValue> device_volume_settings_; 72 73 PrefService* local_state_; // not owned 74 PrefChangeRegistrar pref_change_registrar_; 75 ObserverList<AudioPrefObserver> observers_; 76 77 DISALLOW_COPY_AND_ASSIGN(AudioDevicesPrefHandlerImpl); 78 }; 79 80 } // namespace chromeos 81 82 #endif // CHROME_BROWSER_CHROMEOS_AUDIO_AUDIO_DEVICES_PREF_HANDLER_IMPL_H_ 83