ash/system/brightness_control_delegate.h

   1 // Copyright 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 ASH_SYSTEM_BRIGHTNESS_CONTROL_DELEGATE_H_
   6 #define ASH_SYSTEM_BRIGHTNESS_CONTROL_DELEGATE_H_
   7
   8 #include "base/callback.h"
   9
  10 namespace ui {
  11 class Accelerator;
  12 }  // namespace ui
  13
  14 namespace ash {
  15
  16 // Delegate for controlling the brightness.
  17 class BrightnessControlDelegate {
  18  public:
  19   virtual ~BrightnessControlDelegate() {}
  20
  21   // Handles an accelerator-driven request to decrease or increase the screen
  22   // brightness.
  23   virtual bool HandleBrightnessDown(const ui::Accelerator& accelerator) = 0;
  24   virtual bool HandleBrightnessUp(const ui::Accelerator& accelerator) = 0;
  25
  26   // Requests that the brightness be set to |percent|, in the range
  27   // [0.0, 100.0].  |gradual| specifies whether the transition to the new
  28   // brightness should be animated or instantaneous.
  29   virtual void SetBrightnessPercent(double percent, bool gradual) = 0;
  30
  31   // Asynchronously invokes |callback| with the current brightness, in the range
  32   // [0.0, 100.0].
  33   virtual void GetBrightnessPercent(
  34       const base::Callback<void(double)>& callback) = 0;
  35 };
  36
  37 }  // namespace ash
  38
  39 #endif  // ASH_SYSTEM_BRIGHTNESS_CONTROL_DELEGATE_H_