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: ~BrightnessControlDelegate()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_ 40