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145 lines
4.5 KiB
HTML
145 lines
4.5 KiB
HTML
<!doctype html>
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<meta charset=utf-8>
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<title>CSSTransition.currentTime</title>
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<!-- TODO: Add a more specific link for this once it is specified. -->
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<link rel="help" href="https://drafts.csswg.org/css-transitions-2/#csstransition">
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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="support/helper.js"></script>
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<div id="log"></div>
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<script>
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'use strict';
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const marginLeft = div => parseFloat(getComputedStyle(div).marginLeft);
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promise_test(async t => {
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const div = addDiv(t, {
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style: 'margin-left: 100px; transition: margin-left 100s linear 100s',
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});
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getComputedStyle(div).marginLeft;
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div.style.marginLeft = '200px';
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const animation = div.getAnimations()[0];
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assert_equals(
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animation.currentTime,
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0,
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'currentTime should initially be zero'
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);
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await animation.ready;
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const seekTime = 150 * MS_PER_SEC;
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animation.currentTime = seekTime;
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assert_time_equals_literal(
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animation.currentTime,
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seekTime,
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'currentTime is updated'
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);
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assert_equals(getComputedStyle(div).marginLeft, '150px');
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}, 'currentTime can be used to seek a CSS transition');
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promise_test(async t => {
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const div = addDiv(t, {
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style: 'margin-left: 100px; transition: margin-left 100s linear 100s',
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});
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const eventWatcher = new EventWatcher(t, div, 'transitionend');
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getComputedStyle(div).marginLeft;
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div.style.marginLeft = '200px';
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const animation = div.getAnimations()[0];
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await animation.ready;
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const marginLeft = () => parseFloat(getComputedStyle(div).marginLeft);
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assert_equals(marginLeft(div), 100);
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animation.currentTime = 100 * MS_PER_SEC;
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assert_equals(marginLeft(div), 100);
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animation.currentTime = 150 * MS_PER_SEC;
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assert_equals(marginLeft(div), 150);
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animation.currentTime = 200 * MS_PER_SEC;
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await eventWatcher.wait_for('transitionend');
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assert_equals(marginLeft(div), 200);
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}, 'Skipping forwards through transition');
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promise_test(async t => {
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const div = addDiv(t, {
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style: 'margin-left: 100px; transition: margin-left 100s linear 100s',
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});
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const eventWatcher = new EventWatcher(t, div, 'transitionend');
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getComputedStyle(div).marginLeft;
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div.style.marginLeft = '200px';
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const animation = div.getAnimations()[0];
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await animation.ready;
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// Unlike in the case of CSS animations, we cannot skip to the end and skip
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// backwards since when we reach the end the transition effect is removed and
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// changes to the Animation object no longer affect the element. For
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// this reason we only skip forwards as far as the 50% through point.
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animation.currentTime = 150 * MS_PER_SEC;
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assert_equals(marginLeft(div), 150);
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animation.currentTime = 100 * MS_PER_SEC;
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assert_equals(marginLeft(div), 100);
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}, 'Skipping backwards through transition');
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promise_test(async t => {
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const div = addDiv(t, {
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style: 'margin-left: 100px; transition: margin-left 100s linear 100s',
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});
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getComputedStyle(div).marginLeft;
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div.style.marginLeft = '200px';
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const animation = div.getAnimations()[0];
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await animation.ready;
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assert_throws_js(
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TypeError,
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() => {
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animation.currentTime = null;
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},
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'Expect TypeError exception on trying to set Animation.currentTime to null'
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);
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}, 'Setting currentTime to null on a CSS transition throws');
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test(t => {
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const div = addDiv(t);
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div.style.left = '0px';
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getComputedStyle(div).transitionProperty;
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div.style.transition = 'left 100s ease-in';
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div.style.left = '100px';
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const transition = div.getAnimations()[0];
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// Seek to the middle. Note, this is not equivalent to 50% progress since the
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// timing-function is non-linear.
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transition.currentTime = 50 * MS_PER_SEC;
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const portion = transition.effect.getComputedTiming().progress;
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// Reverse the transition.
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div.style.left = '0px';
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const reversedTransition = div.getAnimations()[0];
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// If the transition reversing behavior does not advance the previous
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// transition to the time set by currentTime, start and end values will both
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// be 0px and no transition will be produced.
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assert_not_equals(reversedTransition, undefined,
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"A reversed transition is produced");
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const expectedDuration = 100 * MS_PER_SEC * portion;
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assert_approx_equals(
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reversedTransition.effect.getComputedTiming().activeDuration,
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expectedDuration,
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1,
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"The reversed transition has correctly reduced duration"
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);
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}, "Transition reversing behavior respects currentTime and uses the " +
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"transition's current position.");
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</script>
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