scroll-animations/scroll-timelines/pause-animation.html - external/w3c/web-platform-tests - Git at Google

 <!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);
   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);
   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);
   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 25% but if we correctly used the old playback rate the current time
   // will be > 50%.
   assert_percents_equal(animation.currentTime, 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;
   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);
   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_equals(animation.startTime, null,
                         'The start time is null 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>
	<!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);
	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);
	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);
	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 25% but if we correctly used the old playback rate the current time
	// will be > 50%.
	assert_percents_equal(animation.currentTime, 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;
	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);
	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_equals(animation.startTime, null,
	'The start time is null 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>