screen_backlight_observer.h 969 B

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  1. // Copyright 2020 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. #ifndef ASH_PUBLIC_CPP_SCREEN_BACKLIGHT_OBSERVER_H_
  5. #define ASH_PUBLIC_CPP_SCREEN_BACKLIGHT_OBSERVER_H_
  6. #include "ash/public/cpp/ash_public_export.h"
  7. #include "ash/public/cpp/screen_backlight_type.h"
  8. namespace ash {
  9. // Used to observe backlight related events inside ash.
  10. class ASH_PUBLIC_EXPORT ScreenBacklightObserver {
  11. public:
  12. virtual ~ScreenBacklightObserver() = default;
  13. // Called when the observed BacklightsForcedOffSetter instance stops or
  14. // starts forcing backlights off.
  15. virtual void OnBacklightsForcedOffChanged(bool backlights_forced_off) {}
  16. // Called when the screen backlight state change is detected.
  17. virtual void OnScreenBacklightStateChanged(
  18. ScreenBacklightState screen_state) {}
  19. };
  20. } // namespace ash
  21. #endif // ASH_PUBLIC_CPP_SCREEN_BACKLIGHT_OBSERVER_H_