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e2c18721ff
Also, port the "appish" example to exercise the drawer. R=eseidel@chromium.org Review URL: https://codereview.chromium.org/942413002
49 lines
1.2 KiB
Dart
49 lines
1.2 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import "curves.dart";
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import "timer.dart";
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class AnimationController extends AnimationDelegate {
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final AnimationDelegate _delegate;
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AnimationTimer _timer;
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double _begin = 0.0;
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double _end = 0.0;
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Curve _curve;
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bool _isAnimating = false;
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AnimationController(this._delegate) {
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_timer = new AnimationTimer(this);
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}
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bool get isAnimating => _isAnimating;
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void start({double begin: 0.0, double end: 0.0, Curve curve: linear,
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double duration: 0.0}) {
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_begin = begin;
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_end = end;
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_curve = curve;
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_isAnimating = true;
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_timer.start(duration);
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}
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void stop() {
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_isAnimating = false;
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_timer.stop();
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}
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double _positionForTime(double t) {
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// Explicitly finish animations at |_end| in case the curve isn't an
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// exact numerical transform.
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if (t == 1)
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return _end;
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double curvedTime = _curve.transform(t);
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return _begin + (_end - _begin) * curvedTime;
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}
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void updateAnimation(double t) {
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_delegate.updateAnimation(_positionForTime(t));
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}
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}
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