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 CHROME_BROWSER_CHROMEOS_POWER_BRIGHTNESS_OBSERVER_H_ 6 #define CHROME_BROWSER_CHROMEOS_POWER_BRIGHTNESS_OBSERVER_H_ 7 8 #include "base/basictypes.h" 9 #include "base/compiler_specific.h" 10 #include "chromeos/dbus/power_manager_client.h" 11 12 namespace chromeos { 13 14 // This observer listens for changes to the screen brightness and notifies 15 // extensions and ash::PowerButtonController about them. 16 class BrightnessObserver : public PowerManagerClient::Observer { 17 public: 18 // This class registers/unregisters itself as an observer in ctor/dtor. 19 BrightnessObserver(); 20 virtual ~BrightnessObserver(); 21 22 private: 23 // PowerManagerClient::Observer implementation. 24 virtual void BrightnessChanged(int level, bool user_initiated) OVERRIDE; 25 26 DISALLOW_COPY_AND_ASSIGN(BrightnessObserver); 27 }; 28 29 } // namespace chromeos 30 31 #endif // CHROME_BROWSER_CHROMEOS_POWER_BRIGHTNESS_OBSERVER_H_ 32