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<!DOCTYPE html>
<meta charset=utf-8>
<title>Reversing an animation</title>
<link rel="help"
href="https://drafts.csswg.org/web-animations/#reversing-an-animation-section">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="testcommon.js"></script>
<style>
.scroller {
overflow: auto;
height: 100px;
width: 100px;
will-change: transform;
}
.contents {
height: 1000px;
width: 100%;
}
</style>
<body>
<script>
'use strict';
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
animation.reverse();
animation.currentTime = CSSNumericValue.parse("40%");
await animation.ready;
assert_percents_equal(animation.currentTime, 40);
}, 'Setting current time while reverse-pending preserves currentTime');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
animation.play();
await animation.ready;
animation.currentTime = CSSNumericValue.parse("50%");
const previousPlaybackRate = animation.playbackRate;
animation.reverse();
assert_equals(animation.playbackRate, previousPlaybackRate,
'Playback rate should not have changed');
await animation.ready;
assert_equals(animation.playbackRate, -previousPlaybackRate,
'Playback rate should be inverted');
}, 'Reversing an animation inverts the playback rate');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
animation.play();
animation.currentTime = CSSNumericValue.parse("40%");
await animation.ready;
assert_percents_equal(animation.startTime, -40);
assert_percents_equal(animation.currentTime, 40);
animation.reverse();
await animation.ready;
assert_percents_equal(animation.startTime, 100);
assert_percents_equal(animation.currentTime, 100);
}, 'Reversing an animation resets a sticky start time.');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
animation.play();
assert_true(animation.pending,
'The animation is pending before we call reverse');
animation.reverse();
assert_true(animation.pending,
'The animation is still pending after calling reverse');
}, 'Reversing an animation does not cause it to leave the pending state');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
animation.play();
let readyResolved = false;
animation.ready.then(() => { readyResolved = true; });
animation.reverse();
await Promise.resolve();
assert_false(readyResolved,
'ready promise should not have been resolved yet');
}, 'Reversing an animation does not cause it to resolve the ready promise');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
animation.play();
animation.playbackRate = -1;
animation.reverse();
await animation.ready;
assert_percents_equal(animation.currentTime, 0);
}, 'Reversing an animation with a negative playback rate should cause ' +
'the animation to play in a forward direction');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
animation.play();
animation.playbackRate = 0;
animation.currentTime = CSSNumericValue.parse("50%");
animation.reverse();
await animation.ready;
assert_equals(animation.playbackRate, 0,
'reverse() should preserve playbackRate if the playbackRate == 0');
assert_percents_equal(animation.currentTime, 0,
'Anchors to range start boundary when playback rate is zero');
}, 'Reversing when when playbackRate == 0 should preserve the playback rate');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
assert_equals(animation.currentTime, null);
animation.reverse();
await animation.ready;
assert_percents_equal(animation.startTime, 100,
'animation.startTime should be at its effect end');
assert_percents_equal(animation.currentTime, 100,
'animation.currentTime should be at its effect end');
}, 'Reversing an idle animation aligns startTime with the rangeEnd boundary');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
// Make the scroll timeline inactive.
scroller.style.overflow = 'visible';
scroller.scrollTop;
await waitForNextFrame();
assert_throws_dom('InvalidStateError', () => { animation.reverse(); });
}, 'Reversing an animation without an active timeline throws an ' +
'InvalidStateError');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
animation.play();
animation.currentTime = CSSNumericValue.parse("50%");
animation.pause();
await animation.ready;
animation.reverse();
assert_equals(animation.playState, 'running',
'Animation.playState should be "running" after reverse()');
}, 'Reversing an animation plays a pausing animation');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
animation.play();
await animation.ready;
animation.updatePlaybackRate(2);
animation.reverse();
await animation.ready;
assert_equals(animation.playbackRate, -2);
}, 'Reversing should use the negative pending playback rate');
</script>
</body>
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