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
8namespace ash {
9namespace system {
10
11class 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_
49