ash/system/audio/tray_audio_delegate.h

   1 // Copyright 2014 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 ASH_SYSTEM_AUDIO_TRAY_AUDIO_DELEGATE_H_
   6 #define ASH_SYSTEM_AUDIO_TRAY_AUDIO_DELEGATE_H_
   7
   8 namespace ash {
   9 namespace system {
  10
  11 class ASH_EXPORT TrayAudioDelegate {
  12  public:
  13
  14   enum { kNoAudioDeviceIcon = -1 };
  15
  16   virtual ~TrayAudioDelegate() {}
  17
  18   // Sets the volume level of the output device to the minimum level which is
  19   // deemed to be audible.
  20   virtual void AdjustOutputVolumeToAudibleLevel() = 0;
  21
  22   // Gets the default level in the range 0%-100% at which the output device
  23   // should be muted.
  24   virtual int GetOutputDefaultVolumeMuteLevel() = 0;
  25
  26   // Gets the icon to use for the active output device.
  27   virtual int GetActiveOutputDeviceIconId() = 0;
  28
  29   // Returns the volume level of the output device in the range 0%-100%.
  30   virtual int GetOutputVolumeLevel() = 0;
  31
  32   // Returns true if the device has alternative inputs or outputs.
  33   virtual bool HasAlternativeSources() = 0;
  34
  35   // Returns whether the output volume is muted.
  36   virtual bool IsOutputAudioMuted() = 0;
  37
  38   // Sets the mute state of the output device.
  39   virtual void SetOutputAudioIsMuted(bool is_muted) = 0;
  40
  41   // Sets the volume level of the output device in the range 0%-100%
  42   virtual void SetOutputVolumeLevel(int level) = 0;
  43 };
  44
  45 }  // namespace system
  46 }  // namespace ash
  47
  48 #endif  // ASH_SYSTEM_AUDIO_TRAY_AUDIO_DELEGATE_H_