| // Copyright 2016 The Chromium 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 CHROMECAST_GRAPHICS_CAST_VSYNC_SETTINGS_H_ |
| #define CHROMECAST_GRAPHICS_CAST_VSYNC_SETTINGS_H_ |
| |
| #include "base/lazy_instance.h" |
| #include "base/macros.h" |
| #include "base/observer_list.h" |
| #include "base/time/time.h" |
| |
| namespace chromecast { |
| |
| // Provides a central place to manage VSync interval, supports observers |
| // to be notified of changes. |
| // TODO(halliwell): plumb this via Ozone or ui::Display instead. |
| class CastVSyncSettings { |
| public: |
| class Observer { |
| public: |
| virtual ~Observer() {} |
| virtual void OnVSyncIntervalChanged(base::TimeDelta interval) = 0; |
| }; |
| |
| static CastVSyncSettings* GetInstance(); |
| |
| base::TimeDelta GetVSyncInterval() const; |
| void SetVSyncInterval(base::TimeDelta interval); |
| |
| void AddObserver(Observer* observer); |
| void RemoveObserver(Observer* observer); |
| |
| private: |
| friend struct base::LazyInstanceTraitsBase<CastVSyncSettings>; |
| |
| CastVSyncSettings(); |
| ~CastVSyncSettings(); |
| |
| base::TimeDelta interval_; |
| base::ObserverList<Observer> observers_; |
| |
| DISALLOW_COPY_AND_ASSIGN(CastVSyncSettings); |
| }; |
| |
| } // namespace chromecast |
| |
| #endif // CHROMECAST_GRAPHICS_CAST_VSYNC_SETTINGS_H_ |