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Side by Side Diff: sky/framework/animation/timer.dart

Issue 942413002: Port sky-drawer to Dart (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 10 months ago
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1 // Copyright 2015 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 import "dart:math" as math;
6 import "dart:sky";
7
8 abstract class AnimationDelegate {
9 void updateAnimation(double t);
10 }
11
12 class AnimationTimer {
13 final AnimationDelegate _delegate;
14 double _startTime = 0.0;
15 double _duration = 0.0;
16 int _animationId = 0;
17
18 AnimationTimer(this._delegate);
19
20 void start(double duration) {
21 if (_animationId != 0)
22 stop();
23 _duration = duration;
24 _scheduleTick();
25 }
26
27 void stop() {
28 window.cancelAnimationFrame(_animationId);
29 _startTime = 0.0;
30 _duration = 0.0;
31 _animationId = 0;
32 }
33
34 void _scheduleTick() {
35 assert(_animationId == 0);
36 _animationId = window.requestAnimationFrame(_tick);
37 }
38
39 void _tick(double timeStamp) {
40 _animationId = 0;
41 if (_startTime == 0.0)
42 _startTime = timeStamp;
43 double elapsedTime = timeStamp - _startTime;
44 double t = math.max(0.0, math.min(1.0, elapsedTime / _duration));
45 if (t < 1.0)
46 _scheduleTick();
47 else
48 stop();
49 _delegate.updateAnimation(t);
50 }
51 }
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