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16c4b41391
R=eseidel@chromium.org, esprehn@chromium.org Review URL: https://codereview.chromium.org/886723002
47 lines
1.2 KiB
Plaintext
47 lines
1.2 KiB
Plaintext
<!--
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// 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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-->
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<import src="timer.sky" as="AnimationTimer" />
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<script>
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module.exports = class AnimationController {
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constructor(delegate) {
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this.delegate_ = delegate;
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this.timer_ = new AnimationTimer(this);
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this.begin_ = 0;
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this.end_ = 0;
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this.curve_ = null;
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this.isAnimating = false;
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Object.preventExtensions(this);
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}
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start(options) {
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this.begin_ = options.begin;
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this.end_ = options.end;
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this.curve_ = options.curve;
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this.isAnimating = true;
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this.timer_.start(options.duration);
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}
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stop() {
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this.isAnimating = false;
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this.timer_.stop();
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}
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positionForTime_(t) {
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// Explicitly finish animations at |this.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 this.end_;
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var curvedTime = this.curve_.transform(t);
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var begin = this.begin_;
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return begin + (this.end_ - begin) * curvedTime;
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}
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updateAnimation(t) {
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this.delegate_.updateAnimation(this.positionForTime_(t));
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}
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};
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</script>
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