<!DOCTYPE html>
<meta charset=utf-8>
<title>Setting the start time of scroll animation</title>
<link rel="help" href="https://drafts.csswg.org/web-animations/#setting-the-start-time-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: 200px;
width: 100px;
will-change: transform;
}
.contents {
height: 1000px;
width: 100%;
}
</style>
<body>
<div id="log"></div>
<script>
'use strict';
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
assert_throws_dom('NotSupportedError', () => {
animation.startTime = CSSNumericValue.parse("300");
});
assert_throws_dom('NotSupportedError', () => {
animation.startTime = CSSNumericValue.parse("300ms");
});
assert_throws_dom('NotSupportedError', () => {
animation.startTime = CSSNumericValue.parse("0.3s");
});
}, 'Setting the start time to an absolute time value throws exception');
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();
// So long as a hold time is set, querying the current time will return
// the hold time.
// Since the start time is unresolved at this point, setting the current time
// will set the hold time
animation.currentTime = CSSNumericValue.parse("30%");
assert_equals(animation.startTime, null, 'The start time stays unresolved');
assert_percents_equal(animation.currentTime, 30,
'The current time is calculated from the hold time');
// If we set the start time, however, we should clear the hold time.
animation.startTime = CSSNumericValue.parse("0%");
assert_percents_equal(animation.startTime, 0,
'The start time is set to the requested value');
assert_percents_equal(animation.currentTime, 20,
'The current time is calculated from the start time, ' +
'not the hold time');
// Sanity check
assert_equals(animation.playState, 'running',
'Animation reports it is running after setting a resolved ' +
'start time');
}, 'Setting the start time clears the hold time');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
// Make the scroll timeline inactive.
scroller.style.overflow = 'visible';
// 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');
// So long as a hold time is set, querying the current time will return
// the hold time.
// Since the start time is unresolved at this point, setting the current time
// will set the hold time
animation.currentTime = CSSNumericValue.parse("30%");
assert_equals(animation.startTime, null, 'The start time stays unresolved');
assert_percents_equal(animation.currentTime, 30,
'The current time is calculated from the hold time');
// If we set the start time, however, we should clear the hold time.
animation.startTime = CSSNumericValue.parse("0%");
assert_percents_equal(animation.startTime, 0,
'The start time is set to the requested value');
assert_equals(animation.currentTime, null,
'The current time is calculated from the start time, not' +
' the hold time');
// Sanity check
assert_equals(animation.playState, 'running',
'Animation reports it is running after setting a resolved ' +
'start time');
}, 'Setting the start time clears the hold time 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;
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
// Set up a running animation (i.e. both start time and current time
// are resolved).
animation.startTime = CSSNumericValue.parse("5%");
assert_equals(animation.playState, 'running');
assert_percents_equal(animation.startTime, 5,
'The start time is set to the requested value');
assert_percents_equal(animation.currentTime, 15,
'Current time is resolved for a running animation');
// Clear start time
animation.startTime = null;
assert_equals(animation.startTime, null,
'The start time is set to the requested value');
assert_percents_equal(animation.currentTime, 15,
'Hold time is set after start time is made unresolved');
assert_equals(animation.playState, 'paused',
'Animation reports it is paused after setting an unresolved'
+ ' start time');
}, 'Setting an unresolved start time sets the hold time');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
// Make the scroll timeline inactive.
scroller.style.overflow = 'visible';
// 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');
// Set up a running animation (i.e. both start time and current time
// are resolved).
animation.startTime = CSSNumericValue.parse("5%");
assert_equals(animation.playState, 'running');
assert_percents_equal(animation.startTime, 5,
'The start time is set to the requested value');
assert_equals(animation.currentTime, null,
'Current time is unresolved for a running animation when the ' +
'timeline is inactive');
// Clear start time
animation.startTime = null;
assert_equals(animation.startTime, null,
'The start time is set to the requested value');
assert_equals(animation.currentTime, null,
'Hold time is set to unresolved after start time is made ' +
'unresolved');
assert_equals(animation.playState, 'idle',
'Animation reports it is idle after setting an unresolved'
+ ' start time');
}, 'Setting an unresolved start time sets the hold time to unresolved when ' +
'the timeline is inactive');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
let readyPromiseCallbackCalled = false;
animation.ready.then(() => { readyPromiseCallbackCalled = true; } );
// Put the animation in the play-pending state
animation.play();
// Sanity check
assert_true(animation.pending && animation.playState === 'running',
'Animation is in play-pending state');
// Setting the start time should resolve the 'ready' promise, i.e.
// it should schedule a microtask to run the promise callbacks.
animation.startTime = CSSNumericValue.parse("10%");
assert_percents_equal(animation.startTime, 10,
'The start time is set to the requested value');
assert_false(readyPromiseCallbackCalled,
'Ready promise callback is not called synchronously');
// If we schedule another microtask then it should run immediately after
// the ready promise resolution microtask.
await Promise.resolve();
assert_true(readyPromiseCallbackCalled,
'Ready promise callback called after setting startTime');
}, 'Setting the start time resolves a pending ready promise');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
const scroller = animation.timeline.source;
// Make the scroll timeline inactive.
scroller.style.overflow = 'visible';
// 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');
let readyPromiseCallbackCalled = false;
animation.ready.then(() => { readyPromiseCallbackCalled = true; } );
// Put the animation in the play-pending state
animation.play();
// Sanity check
assert_true(animation.pending && animation.playState === 'running',
'Animation is in play-pending state');
// Setting the start time should resolve the 'ready' promise, i.e.
// it should schedule a microtask to run the promise callbacks.
animation.startTime = CSSNumericValue.parse("10%");
assert_percents_equal(animation.startTime, 10,
'The start time is set to the requested value');
assert_false(readyPromiseCallbackCalled,
'Ready promise callback is not called synchronously');
// If we schedule another microtask then it should run immediately after
// the ready promise resolution microtask.
await Promise.resolve();
assert_true(readyPromiseCallbackCalled,
'Ready promise callback called after setting startTime');
}, 'Setting the start time resolves a pending ready promise when the timeline' +
'is inactive');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
// Put the animation in the play-pending state
animation.play();
// Sanity check
assert_true(animation.pending, 'Animation is pending');
assert_equals(animation.playState, 'running', 'Animation is play-pending');
assert_equals(animation.startTime, null, 'Start time is unresolved');
// Setting start time should cancel the pending task.
animation.startTime = null;
assert_false(animation.pending, 'Animation is no longer pending');
assert_equals(animation.playState, 'idle', 'Animation is idle');
}, 'Setting an unresolved start time on a play-pending animation makes it'
+ ' idle');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
// Set start time such that the current time is past the end time
animation.startTime = CSSNumericValue.parse("-110%");
assert_percents_equal(animation.startTime, -110,
'The start time is set to the requested value');
assert_equals(animation.playState, 'finished',
'Seeked to finished state using the startTime');
// If the 'did seek' flag is true, the current time should be greater than
// the effect end.
assert_greater_than(animation.currentTime.value,
animation.effect.getComputedTiming().endTime.value,
'Setting the start time updated the finished state with'
+ ' the \'did seek\' flag set to true');
// Furthermore, that time should persist if we have correctly updated
// the hold time
const finishedCurrentTime = animation.currentTime;
await waitForNextFrame();
assert_percents_equal(animation.currentTime, finishedCurrentTime,
'Current time does not change after seeking past the ' +
'effect end time by setting the current time');
}, 'Setting the start time updates the finished state');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
animation.play();
await animation.ready;
assert_equals(animation.playState, 'running');
// Setting the start time updates the finished state. The hold time is not
// constrained by the effect end time.
animation.startTime = CSSNumericValue.parse("-110%");
assert_equals(animation.playState, 'finished');
assert_percents_equal(animation.currentTime, 110);
}, 'Setting the start time on a running animation updates the play state');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
animation.play();
await animation.ready;
// Setting the start time updates the finished state. The hold time is not
// constrained by the normal range of the animation time.
animation.currentTime = CSSNumericValue.parse("100%");
assert_equals(animation.playState, 'finished', 'Animation is finished');
animation.playbackRate = -1;
assert_equals(animation.playState, 'running', 'Animation is running');
animation.startTime = CSSNumericValue.parse("-200%");
assert_equals(animation.playState, 'finished', 'Animation is finished');
assert_percents_equal(animation.currentTime, -200);
}, 'Setting the start time on a reverse running animation updates the play '
+ 'state');
promise_test(async t => {
const animation = createScrollLinkedAnimation(t);
let readyPromiseCallbackCalled = false;
animation.ready.then(() => { readyPromiseCallbackCalled = true; } );
animation.pause();
// Sanity check
assert_true(animation.pending && animation.playState === 'paused',
'Animation is in pause-pending state');
// Setting the start time should resolve the 'ready' promise although
// the resolution callbacks when be run in a separate microtask.
animation.startTime = null;
assert_false(readyPromiseCallbackCalled,
'Ready promise callback is not called synchronously');
await Promise.resolve();
assert_true(readyPromiseCallbackCalled,
'Ready promise callback called after setting startTime');
}, 'Setting the start time resolves a pending pause task');
promise_test(async t => {
const anim = createScrollLinkedAnimation(t);
// Wait for new animation frame which allows the timeline to compute new
// current time.
await waitForNextFrame();
anim.play();
// We should be play-pending now
assert_true(anim.pending);
assert_equals(anim.playState, 'running');
// Apply a pending playback rate
anim.updatePlaybackRate(2);
assert_equals(anim.playbackRate, 1);
assert_true(anim.pending);
// Setting the start time should apply the pending playback rate
anim.startTime = CSSNumericValue.parse(
anim.timeline.currentTime.value - 2500 + "%");
assert_equals(anim.playbackRate, 2);
assert_false(anim.pending);
// Sanity check that the start time is preserved and current time is
// calculated using the new playback rate
assert_percents_equal(anim.startTime,
anim.timeline.currentTime.value - 2500);
assert_percents_equal(anim.currentTime, 5000);
}, 'Setting the start time of a play-pending animation applies a pending '
+ 'playback rate');
promise_test(async t => {
const anim = createScrollLinkedAnimation(t);
anim.play();
await anim.ready;
// We should be running now
assert_false(anim.pending);
assert_equals(anim.playState, 'running');
// Apply a pending playback rate
anim.updatePlaybackRate(2);
assert_equals(anim.playbackRate, 1);
assert_true(anim.pending);
// Setting the start time should apply the pending playback rate
anim.startTime = CSSNumericValue.parse(
anim.timeline.currentTime.value - 25 + "%");
assert_equals(anim.playbackRate, 2);
assert_false(anim.pending);
// Sanity check that the start time is preserved and current time is
// calculated using the new playback rate
assert_percents_equal(anim.startTime,
anim.timeline.currentTime.value - 25);
assert_percents_equal(anim.currentTime, 50);
}, 'Setting the start time of a playing animation applies a pending playback '
+ 'rate');
</script>
</body>
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