ash/volume_control_delegate.h

   1 // Copyright (c) 2012 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_VOLUME_CONTROL_DELEGATE_H_
   6 #define ASH_VOLUME_CONTROL_DELEGATE_H_
   7
   8 namespace ui {
   9 class Accelerator;
  10 }  // namespace ui
  11
  12 namespace ash {
  13
  14 // Delegate for controlling the volume.
  15 class VolumeControlDelegate {
  16  public:
  17   virtual ~VolumeControlDelegate() {}
  18
  19   virtual bool HandleVolumeMute(const ui::Accelerator& accelerator) = 0;
  20   virtual bool HandleVolumeDown(const ui::Accelerator& accelerator) = 0;
  21   virtual bool HandleVolumeUp(const ui::Accelerator& accelerator) = 0;
  22
  23   // Is the system audio muted?
  24   virtual bool IsAudioMuted() const = 0;
  25
  26   // Mutes/Unmutes the audio system.
  27   virtual void SetAudioMuted(bool muted) = 0;
  28
  29   // Gets the volume level. The range is [0, 1.0].
  30   virtual float GetVolumeLevel() const = 0;
  31
  32   // Sets the volume level. The range is [0, 1.0].
  33   virtual void SetVolumeLevel(float level) = 0;
  34
  35   // Requests that the volume be set to |percent|, in the range
  36   // [0.0, 100.0].
  37   virtual void SetVolumePercent(double percent) = 0;
  38 };
  39
  40 }  // namespace ash
  41
  42 #endif  // ASH_VOLUME_CONTROL_DELEGATE_H_