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<!DOCTYPE html>
<meta charset=utf-8>
<title>Pausing an animation</title>
<link rel="help"
href="https://drafts.csswg.org/web-animations/#pausing-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);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
await animation.ready;
const startTimeBeforePausing = animation.startTime;
animation.pause();
assert_percents_equal(animation.startTime, startTimeBeforePausing,
'The start time does not change when pausing-pending');
await animation.ready;
assert_equals(animation.startTime, null,
'The start time is unresolved when paused');
}, 'Pausing clears the start time');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
await animation.ready;
animation.pause();
assert_not_equals(animation.startTime, null,
'The start time is resolved when pause-pending');
animation.play();
assert_not_equals(animation.startTime, null,
'The start time is preserved when a pause is aborted');
}, 'Aborting a pause preserves the start time');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
const promise = animation.ready;
animation.pause();
const promiseResult = await promise;
assert_equals(promiseResult, animation);
assert_equals(animation.ready, promise);
assert_false(animation.pending, 'No longer pause-pending');
}, 'A pending ready promise should be resolved and not replaced when the'
+ ' animation is paused');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
// Let animation start roughly half-way through
animation.currentTime = CSSNumericValue.parse("50%");
await animation.ready;
// Go pause-pending and also set a pending playback rate
animation.pause();
animation.updatePlaybackRate(0.5);
await animation.ready;
// If the current time was updated using the new playback rate it will jump
// back to 25s but if we correctly used the old playback rate the current time
// will be >= 50s.
assert_greater_than_equal(animation.currentTime.value, 50);
}, 'A pause-pending animation maintains the current time when applying a'
+ ' pending playback rate');
promise_test(async t => {
// This test does not cover a specific step in the algorithm but serves as a
// high-level sanity check that pausing does, in fact, freeze the current
// time.
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
await animation.ready;
animation.pause();
await animation.ready;
const currentTimeAfterPausing = animation.currentTime;
scroller.scrollTop = 0.2 * maxScroll;
await waitForNextFrame();
assert_percents_equal(animation.timeline.currentTime, 20,
'Sanity check timeline time changed');
assert_percents_equal(animation.currentTime, currentTimeAfterPausing,
'Animation.currentTime is unchanged after pausing');
}, 'The animation\'s current time remains fixed after pausing');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
const originalReadyPromise = animation.ready;
animation.cancel();
assert_equals(animation.startTime, null);
assert_equals(animation.currentTime, null);
const readyPromise = animation.ready;
assert_not_equals(originalReadyPromise, readyPromise,
'Canceling an animation should create a new ready promise');
animation.pause();
assert_equals(animation.playState, 'paused',
'Pausing a canceled animation should update the play state');
assert_true(animation.pending, 'animation should be pause-pending');
await animation.ready;
assert_false(animation.pending,
'animation should no longer be pause-pending');
assert_equals(animation.startTime, null, 'start time should be unresolved');
assert_percents_equal(animation.currentTime, 0,
'current time should be set to zero');
}, 'Pausing a canceled animation sets the current time');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
// Make the scroll timeline inactive.
scroller.style.overflow = 'visible';
scroller.scrollTop;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
assert_equals(animation.timeline.currentTime, null,
'Sanity check the timeline is inactive.');
// Pause the animation when the timeline is inactive.
animation.pause();
assert_equals(animation.currentTime, null,
'The current time is null when the timeline is inactive.');
assert_percents_equal(animation.startTime, 0,
'The start time is zero in Pending state.');
await waitForNextFrame();
assert_true(animation.pending,
'Animation has pause pending task while the timeline is inactive.');
assert_equals(animation.playState, 'paused',
`State is 'paused' in Pending state.`);
}, `Pause pending task doesn't run when the timeline is inactive.`);
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
scroller.scrollTop = 0.2 * maxScroll;
// Make the scroll timeline inactive.
scroller.style.overflow = 'visible';
scroller.scrollTop;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
assert_equals(animation.timeline.currentTime, null,
'Sanity check the timeline is inactive.');
// Play the animation when the timeline is inactive.
animation.pause();
// Make the scroll timeline active.
scroller.style.overflow = 'auto';
await animation.ready;
// Ready promise is resolved as a result of the timeline becoming active.
assert_percents_equal(animation.currentTime, 20,
'Animation current time is resolved when the animation is ready.');
assert_equals(animation.startTime, null,
'Animation start time is unresolved when the animation is ready.');
}, 'Animation start and current times are correct if scroll timeline is ' +
'activated after animation.pause call.');
</script>
</body>
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