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Side by Side Diff: sky/framework/animation/controller.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 "curves.dart";
6 import "timer.dart";
7
8 class AnimationController extends AnimationDelegate {
9 final AnimationDelegate _delegate;
10 AnimationTimer _timer;
11 double _begin = 0.0;
12 double _end = 0.0;
13 Curve _curve;
14 bool _isAnimating = false;
15
16 AnimationController(this._delegate) {
17 _timer = new AnimationTimer(this);
18 }
19
20 bool get isAnimating => _isAnimating;
21
22 void start({double begin: 0.0, double end: 0.0, Curve curve: linear,
23 double duration: 0.0}) {
24 _begin = begin;
25 _end = end;
26 _curve = curve;
27 _isAnimating = true;
28 _timer.start(duration);
29 }
30
31 void stop() {
32 _isAnimating = false;
33 _timer.stop();
34 }
35
36 double _positionForTime(double t) {
37 // Explicitly finish animations at |_end| in case the curve isn't an
38 // exact numerical transform.
39 if (t == 1)
40 return _end;
41 double curvedTime = _curve.transform(t);
42 return _begin + (_end - _begin) * curvedTime;
43 }
44
45 void updateAnimation(double t) {
46 _delegate.updateAnimation(_positionForTime(t));
47 }
48 }
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