| // Copyright 2017 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 REMOTING_CLIENT_UI_FLING_ANIMATION_H_ |
| #define REMOTING_CLIENT_UI_FLING_ANIMATION_H_ |
| |
| #include <memory> |
| |
| #include "base/callback.h" |
| #include "base/time/tick_clock.h" |
| #include "remoting/client/ui/fling_tracker.h" |
| |
| namespace remoting { |
| |
| // This class helps interpolating the positions of an object with the given |
| // initial velocity and feeds the change in position back to the callback. |
| class FlingAnimation { |
| public: |
| // arguments are delta_x and delta_y with respect to the positions at previous |
| // tick. |
| using FlingCallback = base::Callback<void(float, float)>; |
| |
| FlingAnimation(float time_constant, const FlingCallback& fling_callback); |
| ~FlingAnimation(); |
| |
| // (Re)starts the fling animation with the given initial velocity. |
| void SetVelocity(float velocity_x, float velocity_y); |
| |
| bool IsAnimationInProgress() const; |
| |
| // Moves forward the animation to catch up with current time. Calls the fling |
| // callback with the new positions. No-op if fling animation is not in |
| // progress. |
| void Tick(); |
| |
| // Aborts the animation. |
| void Abort(); |
| |
| void SetTickClockForTest(const base::TickClock* clock); |
| |
| private: |
| FlingTracker fling_tracker_; |
| FlingCallback fling_callback_; |
| |
| base::TimeTicks fling_start_time_; |
| |
| const base::TickClock* clock_; |
| |
| // FlingAnimation is neither copyable nor movable. |
| FlingAnimation(const FlingAnimation&) = delete; |
| FlingAnimation& operator=(const FlingAnimation&) = delete; |
| }; |
| |
| } // namespace remoting |
| #endif // REMOTING_CLIENT_UI_FLING_ANIMATION_H_ |