| // Copyright 2017 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef POWER_MANAGER_POWERD_SYSTEM_BACKLIGHT_OBSERVER_H_ |
| #define POWER_MANAGER_POWERD_SYSTEM_BACKLIGHT_OBSERVER_H_ |
| |
| #include <base/observer_list_types.h> |
| |
| namespace power_manager { |
| namespace system { |
| |
| class BacklightInterface; |
| |
| // Interface for observing changes to a BacklightInterface object. |
| class BacklightObserver : public base::CheckedObserver { |
| public: |
| // Called when |backlight|'s underlying backlight device is added or removed. |
| virtual void OnBacklightDeviceChanged(BacklightInterface* backlight) = 0; |
| |
| protected: |
| virtual ~BacklightObserver() = default; |
| }; |
| |
| } // namespace system |
| } // namespace power_manager |
| |
| #endif // POWER_MANAGER_POWERD_SYSTEM_BACKLIGHT_OBSERVER_H_ |