Index: remoting/client/fling_animation.h |
diff --git a/remoting/client/fling_animation.h b/remoting/client/fling_animation.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..c7672e99ebe6967ed9ebbc95aafbf60ee6c0b0de |
--- /dev/null |
+++ b/remoting/client/fling_animation.h |
@@ -0,0 +1,56 @@ |
+// 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_FLING_ANIMATION_H_ |
+#define REMOTING_CLIENT_FLING_ANIMATION_H_ |
+ |
+#include <memory> |
+ |
+#include "base/callback.h" |
+#include "base/time/tick_clock.h" |
+#include "remoting/client/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(std::unique_ptr<base::TickClock> clock); |
+ |
+ private: |
+ FlingTracker fling_tracker_; |
+ FlingCallback fling_callback_; |
+ |
+ base::TimeTicks fling_start_time_; |
+ |
+ std::unique_ptr<base::TickClock> clock_; |
+ |
+ // FlingAnimation is neither copyable nor movable. |
+ FlingAnimation(const FlingAnimation&) = delete; |
+ FlingAnimation& operator=(const FlingAnimation&) = delete; |
+}; |
+ |
+} // namespace remoting |
+#endif // REMOTING_CLIENT_FLING_ANIMATION_H_ |