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89 lines
3.3 KiB
HTML
89 lines
3.3 KiB
HTML
<!DOCTYPE html>
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<meta charset=utf-8>
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<title>Animation.playbackRate</title>
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<link rel="help" href="https://w3c.github.io/web-animations/#dom-animation-playbackrate">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="../testcommon.js"></script>
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<link rel="stylesheet" href="/resources/testharness.css">
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<body>
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<div id="log"></div>
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<script>
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"use strict";
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var keyFrames = { 'marginLeft': ['100px', '200px'] };
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function assert_playbackrate(animation,
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previousAnimationCurrentTime,
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previousTimelineCurrentTime,
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description) {
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var accuracy = 0.001; /* accuracy of DOMHighResTimeStamp */
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var animationCurrentTimeDifference =
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animation.currentTime - previousAnimationCurrentTime;
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var timelineCurrentTimeDifference =
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animation.timeline.currentTime - previousTimelineCurrentTime;
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assert_approx_equals(animationCurrentTimeDifference,
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timelineCurrentTimeDifference * animation.playbackRate,
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accuracy,
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description);
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}
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promise_test(function(t) {
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var div = createDiv(t);
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var animation = div.animate({keyFrames}, 100 * MS_PER_SEC);
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return animation.ready.then(function() {
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animation.currentTime = 7 * MS_PER_SEC; // ms
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animation.playbackRate = 0.5;
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assert_equals(animation.currentTime, 7 * MS_PER_SEC,
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'Reducing Animation.playbackRate should not change the currentTime ' +
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'of a playing animation');
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animation.playbackRate = 2;
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assert_equals(animation.currentTime, 7 * MS_PER_SEC,
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'Increasing Animation.playbackRate should not change the currentTime ' +
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'of a playing animation');
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});
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}, 'Test the initial effect of setting playbackRate on currentTime');
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promise_test(function(t) {
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var div = createDiv(t);
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var animation = div.animate({keyFrames}, 100 * MS_PER_SEC);
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animation.playbackRate = 2;
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var previousTimelineCurrentTime;
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var previousAnimationCurrentTime;
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return animation.ready.then(function() {
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previousAnimationCurrentTime = animation.currentTime;
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previousTimelineCurrentTime = animation.timeline.currentTime;
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return waitForAnimationFrames(1);
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}).then(function() {
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assert_playbackrate(animation,
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previousAnimationCurrentTime,
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previousTimelineCurrentTime,
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'animation.currentTime should be 2 times faster than timeline.');
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});
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}, 'Test the effect of setting playbackRate on currentTime');
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promise_test(function(t) {
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var div = createDiv(t);
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var animation = div.animate({keyFrames}, 100 * MS_PER_SEC);
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animation.playbackRate = 2;
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var previousTimelineCurrentTime;
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var previousAnimationCurrentTime;
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return animation.ready.then(function() {
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previousAnimationCurrentTime = animation.currentTime;
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previousTimelineCurrentTime = animation.timeline.currentTime;
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animation.playbackRate = 1;
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return waitForAnimationFrames(1);
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}).then(function() {
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assert_equals(animation.playbackRate, 1,
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'sanity check: animation.playbackRate is still 1.');
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assert_playbackrate(animation,
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previousAnimationCurrentTime,
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previousTimelineCurrentTime,
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'animation.currentTime should be the same speed as timeline now.');
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});
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}, 'Test the effect of setting playbackRate while playing animation');
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</script>
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</body>
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