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1 // Copyright 2017 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 | |
5 #ifndef REMOTING_CLIENT_FLING_ANIMATION_H_ | |
6 #define REMOTING_CLIENT_FLING_ANIMATION_H_ | |
7 | |
8 #include "base/callback.h" | |
9 #include "remoting/client/fling_tracker.h" | |
10 | |
11 namespace remoting { | |
12 | |
13 // This class helps interpolating the positions of an object with the given | |
14 // initial velocity and feeds the change in position back to the callback. | |
15 class FlingAnimation { | |
16 public: | |
17 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.
| |
18 | |
19 // FlingCallback: arguments are delta_x and delta_y with respect to the | |
20 // 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
| |
21 FlingAnimation(float time_constant, const FlingCallback& fling_callback); | |
22 ~FlingAnimation(); | |
23 | |
24 // (Re)starts the fling animation with the given initial velocity. | |
25 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.
| |
26 | |
27 bool IsAnimationInProgress() const; | |
28 | |
29 // Moves forward the animation to catch up with current time. Calls the fling | |
30 // callback with the new positions. No-op if fling animation is not in | |
31 // progress. | |
32 void Tick(); | |
33 | |
34 // Aborts the animation. | |
35 void Abort(); | |
36 | |
37 private: | |
38 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
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39 FlingCallback fling_callback_; | |
40 | |
41 float previous_position_x_ = 0.f; | |
42 float previous_position_y_ = 0.f; | |
43 | |
44 // FlingAnimation is neither copyable nor movable. | |
45 FlingAnimation(const FlingAnimation&) = delete; | |
46 FlingAnimation& operator=(const FlingAnimation&) = delete; | |
47 }; | |
48 | |
49 } // namespace remoting | |
50 #endif // REMOTING_CLIENT_FLING_ANIMATION_H_ | |
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