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<!DOCTYPE html>
<meta charset=utf-8>
<title>Setting the playback rate of an animation that is using a ScrollTimeline</title>
<link rel="help" href="https://drafts.csswg.org/web-animations/#setting-the-playback-rate-of-an-animation">
<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);
const scroller = animation.timeline.source;
// this forces a layout which results in an active timeline
scroller.scrollTop = 0;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.playbackRate = 0.5;
animation.play();
await animation.ready;
assert_percents_equal(animation.currentTime, 0,
'Zero current time is not affected by playbackRate change.');
}, 'Zero current time is not affected by playbackRate set while the ' +
'animation is in idle state.');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
// this forces a layout which results in an active timeline
scroller.scrollTop = 0;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
await animation.ready;
animation.playbackRate = 0.5;
assert_percents_equal(animation.currentTime, 0,
'Zero current time is not affected by playbackRate change.');
}, 'Zero current time is not affected by playbackRate set while the ' +
'animation is in play-pending state.');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
scroller.scrollTop = 0.2 * maxScroll;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.playbackRate = 0.5;
animation.play();
await animation.ready;
assert_percents_equal(animation.currentTime, 10,
'Initial current time is scaled by playbackRate change.');
}, 'Initial current time is scaled by playbackRate set while ' +
'scroll-linked animation is in running state.');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
const playbackRate = 2;
scroller.scrollTop = 0.2 * maxScroll;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
await animation.ready;
// Set playback rate while the animation is playing.
animation.playbackRate = playbackRate;
assert_percents_equal(animation.currentTime, 40,
'The current time is scaled by the playback rate.');
}, 'The current time is scaled by playbackRate set while the ' +
'scroll-linked animation is in play state.');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
// Set playback rate while the animation is in 'idle' state.
animation.playbackRate = 2;
animation.play();
await animation.ready;
scroller.scrollTop = 0.2 * maxScroll;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
assert_percents_equal(animation.currentTime, 40,
'The current time should increase two times faster ' +
'than timeline time.');
}, 'The playback rate set before scroll-linked animation started playing ' +
'affects the rate of progress of the current time');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
animation.play();
await animation.ready;
animation.playbackRate = 2;
scroller.scrollTop = 0.25 * maxScroll;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
assert_percents_equal(
animation.currentTime,
animation.timeline.currentTime.value * animation.playbackRate,
'The current time should increase two times faster than timeline time');
}, 'The playback rate affects the rate of progress of the current time' +
' when scrolling');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
animation.play();
// Setting the current time while play-pending sets the hold time and not
// the start time. currentTime is unaffected by playback rate until no
// longer pending.
animation.currentTime = CSSNumericValue.parse("25%");
animation.playbackRate = 2;
assert_equals(animation.playState, "running");
assert_true(animation.pending);
assert_percents_equal(animation.currentTime, 25);
await animation.ready;
assert_percents_equal(animation.currentTime, 25);
}, 'Setting the playback rate while play-pending does not scale current ' +
'time.');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
scroller.scrollTop = 0.25 * maxScroll;
animation.play();
await animation.ready;
animation.playbackRate = 2;
assert_percents_equal(animation.currentTime, 50);
}, 'Setting the playback rate while playing scales current time.');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
animation.play();
animation.currentTime = CSSNumericValue.parse("25%");
await animation.ready;
animation.playbackRate = 2;
assert_percents_equal(animation.currentTime, 50);
}, 'Setting the playback rate while playing scales the set current time.');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
animation.playbackRate = -1;
scroller.scrollTop = 0.3 * maxScroll;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
await animation.ready;
const expectedCurrentTime = 100 - animation.timeline.currentTime.value;
assert_percents_equal(animation.currentTime, expectedCurrentTime);
}, 'Negative initial playback rate should correctly modify initial current' +
' time.');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
scroller.scrollTop = 0.5 * maxScroll;
animation.play();
await animation.ready;
const startingTimelineTime = animation.timeline.currentTime;
const startingCurrentTime = animation.currentTime;
assert_percents_equal(startingCurrentTime, 50);
assert_percents_equal(startingTimelineTime, 50);
animation.playbackRate = -1;
scroller.scrollTop = 0.8 * maxScroll;
await waitForNextFrame();
// -300 = 500 - 800
// let timelineDiff =
// startingTimelineTime.value - animation.timeline.currentTime.value;
// // 200 = 500 + (-300)
// let expected = startingCurrentTime.value + timelineDiff;
assert_percents_equal(animation.timeline.currentTime, 80);
assert_percents_equal(animation.currentTime, 20);
scroller.scrollTop = 0.2 * maxScroll;
await waitForNextFrame();
// // 300 = 500 - 200
// timelineDiff =
// startingTimelineTime.value - animation.timeline.currentTime.value;
// // 800 = 500 + 300
// expected = startingCurrentTime.value + timelineDiff;
assert_percents_equal(animation.timeline.currentTime, 20);
assert_percents_equal(animation.currentTime, 80);
}, 'Reversing the playback rate while playing correctly impacts current' +
' time during future scrolls');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
animation.playbackRate = 0;
scroller.scrollTop = 0.3 * maxScroll;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
await animation.ready;
assert_percents_equal(animation.currentTime, 0);
}, 'Zero initial playback rate should correctly modify initial current' +
' time.');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
scroller.scrollTop = 0.2 * maxScroll;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
await animation.ready;
assert_percents_equal(animation.currentTime, 20);
animation.playbackRate = 0;
scroller.scrollTop = 0.5 * maxScroll;
await waitForNextFrame();
// Ensure that current time does not change.
assert_percents_equal(animation.timeline.currentTime, 50);
assert_percents_equal(animation.currentTime, 0);
}, 'Setting a zero playback rate while running preserves the start time');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
const maxScroll = scroller.scrollHeight - scroller.clientHeight;
scroller.scrollTop = 0.2 * maxScroll;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
animation.play();
await animation.ready;
assert_percents_equal(animation.timeline.currentTime, 20);
assert_percents_equal(animation.currentTime, 20);
animation.startTime = animation.currentTime;
// timeline current time [0%, 100%] --> animation current time [-20%, 80%].
assert_percents_equal(animation.currentTime, 0);
animation.playbackRate = -1;
// timeline current time [0%, 100%] --> animation current time [80%, -20%].
// timeline @ 20% --> animation current time @ (20% - 80%) * (-1) = 60%.
assert_percents_equal(animation.timeline.currentTime, 20);
assert_percents_equal(animation.currentTime, 60);
}, 'Reversing an animation with non-boundary aligned start time ' +
'symmetrically adjusts the start time');
</script>
</body>
|
