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16c4b41391
R=eseidel@chromium.org, esprehn@chromium.org Review URL: https://codereview.chromium.org/886723002
50 lines
1.2 KiB
Plaintext
50 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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<script>
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module.exports = class AnimationTimer {
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constructor(delegate) {
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this.delegate_ = delegate;
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this.startTime_ = 0;
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this.duration_ = 0;
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this.animationId_ = 0;
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Object.preventExtensions(this);
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}
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start(duration) {
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if (this.animationId_)
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this.stop();
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this.duration_ = duration;
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this.scheduleTick_();
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}
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stop() {
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cancelAnimationFrame(this.animationId_);
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this.startTime_ = 0;
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this.duration_ = 0;
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this.animationId_ = 0;
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}
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scheduleTick_() {
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if (this.animationId_)
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throw new Error("Tick already scheduled.");
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this.animationId_ = requestAnimationFrame(this.tick_.bind(this));
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}
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tick_(timeStamp) {
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this.animationId_ = 0;
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if (!this.startTime_)
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this.startTime_ = timeStamp;
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var elapsedTime = timeStamp - this.startTime_;
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var t = Math.max(0, Math.min(1, elapsedTime / this.duration_));
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if (t < 1)
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this.scheduleTick_();
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else
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this.stop();
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this.delegate_.updateAnimation(t);
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}
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};
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</script>
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