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..511f44fa7860f56e2cf22e9fabe6e9f2f04441cb |
--- /dev/null |
+++ b/remoting/client/fling_animation.h |
@@ -0,0 +1,50 @@ |
+// 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 "base/callback.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: |
+ using FlingCallback = base::Callback<void(float, float)>; |
nicholss
2017/05/10 19:34:05
Can you document the callback please
Yuwei
2017/05/10 23:28:24
Done.
|
+ |
+ // FlingCallback: arguments are delta_x and delta_y with respect to the |
+ // positions at previous tick. |
nicholss
2017/05/10 19:34:05
running git cl format leaves these spaces?
Yuwei
2017/05/10 23:28:24
I was trying to follow the four-space indenting ru
|
+ FlingAnimation(float time_constant, const FlingCallback& fling_callback); |
+ ~FlingAnimation(); |
+ |
+ // (Re)starts the fling animation with the given initial velocity. |
+ void Reset(float velocity_x, float velocity_y); |
nicholss
2017/05/10 19:34:05
rename to setVelocity() ?
Yuwei
2017/05/10 23:28:24
Done.
|
+ |
+ 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(); |
+ |
+ private: |
+ FlingTracker fling_tracker_; |
nicholss
2017/05/10 19:34:05
Forward declare rather than include?
Yuwei
2017/05/10 23:28:24
This is not a pointer nor a reference so forward d
|
+ FlingCallback fling_callback_; |
+ |
+ float previous_position_x_ = 0.f; |
+ float previous_position_y_ = 0.f; |
+ |
+ // FlingAnimation is neither copyable nor movable. |
+ FlingAnimation(const FlingAnimation&) = delete; |
+ FlingAnimation& operator=(const FlingAnimation&) = delete; |
+}; |
+ |
+} // namespace remoting |
+#endif // REMOTING_CLIENT_FLING_ANIMATION_H_ |