1 // Copyright (c) 2010 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 CHROME_BROWSER_CHROMEOS_CROS_BRIGHTNESS_LIBRARY_H_ 6 #define CHROME_BROWSER_CHROMEOS_CROS_BRIGHTNESS_LIBRARY_H_ 7 #pragma once 8 9 #include "third_party/cros/chromeos_brightness.h" 10 11 namespace chromeos { 12 13 class BrightnessLibrary { 14 public: 15 class Observer { 16 public: 17 virtual void BrightnessChanged(int level, bool user_initiated) = 0; 18 }; 19 ~BrightnessLibrary()20 virtual ~BrightnessLibrary() {} 21 22 virtual void AddObserver(Observer* observer) = 0; 23 virtual void RemoveObserver(Observer* observer) = 0; 24 25 // Factory function, creates a new instance and returns ownership. 26 // For normal usage, access the singleton via CrosLibrary::Get(). 27 static BrightnessLibrary* GetImpl(bool stub); 28 }; 29 30 } // namespace chromeos 31 32 #endif // CHROME_BROWSER_CHROMEOS_CROS_BRIGHTNESS_LIBRARY_H_ 33