418 lines
14 KiB
HTML
418 lines
14 KiB
HTML
<!DOCTYPE html>
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<meta charset=utf-8>
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<title>Setting the timeline of scroll animation</title>
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<link rel="help"
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href="https://drafts.csswg.org/web-animations-1/#setting-the-timeline">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/web-animations/testcommon.js"></script>
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<script src="testcommon.js"></script>
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<style>
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.scroller {
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overflow-x: hidden;
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overflow-y: auto;
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height: 200px;
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width: 100px;
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will-change: transform;
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}
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.contents {
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/* The height is set to align scrolling in pixels with logical time in ms */
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height: 1200px;
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width: 100%;
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}
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@keyframes anim {
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from { opacity: 0; }
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to { opacity: 1; }
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}
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.anim {
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animation: anim 1s paused linear;
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}
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#target {
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height: 100px;
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width: 100px;
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background-color: green;
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margin-top: -1000px;
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}
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</style>
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<body>
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<script>
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'use strict';
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function createAnimation(t) {
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const elem = createDiv(t);
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const animation = elem.animate({ opacity: [1, 0] }, 1000);
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return animation;
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}
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function createPausedCssAnimation(t) {
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const elem = createDiv(t);
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elem.classList.add('anim');
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return elem.getAnimations()[0];
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}
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function updateScrollPosition(timeline, offset) {
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const scroller = timeline.source;
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assert_true(!!scroller, 'source is resolved');
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scroller.scrollTop = offset;
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// Wait for new animation frame which allows the timeline to compute new
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// current time.
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return waitForNextFrame();
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}
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function assert_timeline_current_time(animation, timeline_current_time) {
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if (animation.currentTime instanceof CSSUnitValue){
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assert_percents_equal(animation.timeline.currentTime, timeline_current_time,
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`Timeline's currentTime aligns with the scroll ` +
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`position even when paused`);
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}
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else {
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assert_times_equal(animation.timeline.currentTime, timeline_current_time,
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`Timeline's currentTime aligns with the scroll ` +
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`position even when paused`);
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}
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}
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function assert_scroll_synced_times(animation, timeline_current_time,
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animation_current_time) {
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assert_timeline_current_time(animation, timeline_current_time);
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if (animation.currentTime instanceof CSSUnitValue){
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assert_percents_equal(animation.currentTime, animation_current_time,
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`Animation's currentTime aligns with the scroll position`);
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}
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else {
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assert_times_equal(animation.currentTime, animation_current_time,
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`Animation's currentTime aligns with the scroll position`);
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}
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}
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function assert_paused_times(animation, timeline_current_time,
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animation_current_time) {
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assert_timeline_current_time(animation, timeline_current_time);
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if (animation.currentTime instanceof CSSUnitValue){
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assert_percents_equal(animation.currentTime, animation_current_time,
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`Animation's currentTime is fixed while paused`);
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}
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else {
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assert_times_equal(animation.currentTime, animation_current_time,
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`Animation's currentTime is fixed while paused`);
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}
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}
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promise_test(async t => {
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const scrollTimeline = createScrollTimeline(t);
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await updateScrollPosition(scrollTimeline, 100);
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const animation = createAnimation(t);
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animation.timeline = scrollTimeline;
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assert_true(animation.pending);
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await animation.ready;
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assert_equals(animation.playState, 'running');
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assert_scroll_synced_times(animation, 10, 10);
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}, 'Setting a scroll timeline on a play-pending animation synchronizes ' +
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'currentTime of the animation with the scroll position.');
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promise_test(async t => {
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const scrollTimeline = createScrollTimeline(t);
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await updateScrollPosition(scrollTimeline, 100);
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const animation = createAnimation(t);
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animation.pause();
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animation.timeline = scrollTimeline;
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assert_true(animation.pending);
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await animation.ready;
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assert_equals(animation.playState, 'paused');
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assert_paused_times(animation, 10, 0);
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await updateScrollPosition(animation.timeline, 200);
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assert_equals(animation.playState, 'paused');
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assert_paused_times(animation, 20, 0);
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animation.play();
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await animation.ready;
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assert_scroll_synced_times(animation, 20, 20);
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}, 'Setting a scroll timeline on a pause-pending animation fixes the ' +
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'currentTime of the animation based on the scroll position once resumed');
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promise_test(async t => {
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const scrollTimeline = createScrollTimeline(t);
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await updateScrollPosition(scrollTimeline, 100);
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const animation = createAnimation(t);
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animation.reverse();
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animation.timeline = scrollTimeline;
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await animation.ready;
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assert_equals(animation.playState, 'running');
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assert_scroll_synced_times(animation, 10, 90);
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}, 'Setting a scroll timeline on a reversed play-pending animation ' +
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'synchronizes the currentTime of the animation with the scroll ' +
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'position.');
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promise_test(async t => {
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const scrollTimeline = createScrollTimeline(t);
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await updateScrollPosition(scrollTimeline, 100);
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const animation = createAnimation(t);
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await animation.ready;
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animation.timeline = scrollTimeline;
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assert_true(animation.pending);
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assert_equals(animation.playState, 'running');
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await animation.ready;
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assert_scroll_synced_times(animation, 10, 10);
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}, 'Setting a scroll timeline on a running animation synchronizes the ' +
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'currentTime of the animation with the scroll position.');
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promise_test(async t => {
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const scrollTimeline = createScrollTimeline(t);
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await updateScrollPosition(scrollTimeline, 100);
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const animation = createAnimation(t);
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animation.pause();
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await animation.ready;
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animation.timeline = scrollTimeline;
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assert_false(animation.pending);
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assert_equals(animation.playState, 'paused');
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assert_paused_times(animation, 10, 0);
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animation.play();
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await animation.ready;
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assert_scroll_synced_times(animation, 10, 10);
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}, 'Setting a scroll timeline on a paused animation fixes the currentTime of ' +
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'the animation based on the scroll position when resumed');
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promise_test(async t => {
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const scrollTimeline = createScrollTimeline(t);
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await updateScrollPosition(scrollTimeline, 100);
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const animation = createAnimation(t);
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animation.reverse();
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animation.pause();
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await animation.ready;
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animation.timeline = scrollTimeline;
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assert_false(animation.pending);
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assert_equals(animation.playState, 'paused');
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assert_paused_times(animation, 10, 100);
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animation.play();
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await animation.ready;
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assert_scroll_synced_times(animation, 10, 90);
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}, 'Setting a scroll timeline on a reversed paused animation ' +
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'fixes the currentTime of the animation based on the scroll ' +
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'position when resumed');
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promise_test(async t => {
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const animation = createAnimation(t);
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const scrollTimeline = createScrollTimeline(t);
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animation.timeline = scrollTimeline;
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await animation.ready;
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await updateScrollPosition(scrollTimeline, 100);
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animation.timeline = document.timeline;
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assert_times_equal(animation.currentTime, 100);
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}, 'Transitioning from a scroll timeline to a document timeline on a running ' +
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'animation preserves currentTime');
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promise_test(async t => {
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const animation = createAnimation(t);
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const scrollTimeline = createScrollTimeline(t);
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animation.timeline = scrollTimeline;
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await animation.ready;
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await updateScrollPosition(scrollTimeline, 100);
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animation.pause();
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animation.timeline = document.timeline;
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await animation.ready;
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assert_times_equal(animation.currentTime, 100);
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}, 'Transitioning from a scroll timeline to a document timeline on a ' +
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'pause-pending animation preserves currentTime');
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promise_test(async t => {
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const animation = createAnimation(t);
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const scrollTimeline = createScrollTimeline(t);
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animation.timeline = scrollTimeline;
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animation.reverse();
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await animation.ready;
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await updateScrollPosition(scrollTimeline, 100);
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animation.pause();
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await animation.ready;
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assert_scroll_synced_times(animation, 10, 90);
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animation.timeline = document.timeline;
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assert_false(animation.pending);
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assert_equals(animation.playState, 'paused');
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assert_times_equal(animation.currentTime, 900);
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}, 'Transition from a scroll timeline to a document timeline on a reversed ' +
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'paused animation maintains correct currentTime');
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promise_test(async t => {
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const animation = createAnimation(t);
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const scrollTimeline = createScrollTimeline(t);
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animation.timeline = scrollTimeline;
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await animation.ready;
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await updateScrollPosition(scrollTimeline, 100);
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const progress = animation.currentTime.value / 100;
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const duration = animation.effect.getTiming().duration;
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animation.timeline = null;
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const expectedCurrentTime = progress * duration;
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assert_times_equal(animation.currentTime, expectedCurrentTime);
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}, 'Transitioning from a scroll timeline to a null timeline on a running ' +
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'animation preserves current progress.');
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promise_test(async t => {
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const keyframeEfect = new KeyframeEffect(createDiv(t),
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{ opacity: [0, 1] },
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1000);
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const animation = new Animation(keyframeEfect, null);
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animation.startTime = 0;
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assert_equals(animation.playState, 'running');
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const scrollTimeline = createScrollTimeline(t);
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await updateScrollPosition(scrollTimeline, 100);
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animation.timeline = scrollTimeline;
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assert_equals(animation.playState, 'running');
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await animation.ready;
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assert_percents_equal(animation.currentTime, 10);
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}, 'Switching from a null timeline to a scroll timeline on an animation with ' +
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'a resolved start time preserved the play state');
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promise_test(async t => {
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const firstScrollTimeline = createScrollTimeline(t);
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await updateScrollPosition(firstScrollTimeline, 100);
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const secondScrollTimeline = createScrollTimeline(t);
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await updateScrollPosition(secondScrollTimeline, 200);
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const animation = createAnimation(t);
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animation.timeline = firstScrollTimeline;
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await animation.ready;
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assert_percents_equal(animation.currentTime, 10);
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animation.timeline = secondScrollTimeline;
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await animation.ready;
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assert_percents_equal(animation.currentTime, 20);
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}, 'Switching from one scroll timeline to another updates currentTime');
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promise_test(async t => {
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const scrollTimeline = createScrollTimeline(t);
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await updateScrollPosition(scrollTimeline, 100);
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const animation = createPausedCssAnimation(t);
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animation.timeline = scrollTimeline;
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await animation.ready;
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assert_equals(animation.playState, 'paused');
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assert_percents_equal(animation.currentTime, 0);
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const target = animation.effect.target;
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target.style.animationPlayState = 'running';
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await animation.ready;
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assert_percents_equal(animation.currentTime, 10);
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}, 'Switching from a document timeline to a scroll timeline updates ' +
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'currentTime when unpaused via CSS.');
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promise_test(async t => {
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const scrollTimeline = createScrollTimeline(t);
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await updateScrollPosition(scrollTimeline, 100);
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const animation = createAnimation(t);
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animation.pause();
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animation.currentTime = 500; // 50%
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animation.timeline = scrollTimeline;
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await animation.ready;
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assert_percents_equal(animation.currentTime, 50);
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animation.play();
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await animation.ready;
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assert_percents_equal(animation.currentTime, 10);
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}, 'Switching from a document timeline to a scroll timeline and updating ' +
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'currentTime preserves the progress while paused.');
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promise_test(async t => {
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const elem = createDiv(t);
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const animation = elem.animate(null, Infinity);
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await animation.ready;
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animation.timeline = new ScrollTimeline();
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let timing = animation.effect.getComputedTiming();
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assert_percents_equal(timing.endTime, 100);
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assert_percents_equal(timing.activeDuration, 100);
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assert_percents_equal(timing.duration, 100);
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animation.effect.updateTiming({ iterations: 2 });
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timing = animation.effect.getComputedTiming();
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assert_percents_equal(timing.endTime, 100);
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assert_percents_equal(timing.activeDuration, 100);
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assert_percents_equal(timing.duration, 50);
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// Blink implementation does not permit setting an infinite number of
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// iterations on a scroll-linked animation. Workaround by temporarily
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// switching back to a document timeline.
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animation.timeline = document.timeline;
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animation.effect.updateTiming({ iterations: Infinity });
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animation.timeline = new ScrollTimeline();
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timing = animation.effect.getComputedTiming();
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// Having an infinite number of iterations with a finite timeline results in
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// each iteration having zero duration.
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assert_percents_equal(timing.duration, 0);
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// If either the iteration duration or iteration count is zero, the active
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// duration is always zero.
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assert_percents_equal(timing.activeDuration, 0);
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assert_percents_equal(timing.endTime, 0);
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}, 'Switching from a document timeline to a scroll timeline on an infinite ' +
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'duration animation.');
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promise_test(async t => {
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const scrollTimeline = createScrollTimeline(t);
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const view_timeline = createViewTimeline(t);
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await updateScrollPosition(scrollTimeline, 100);
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const animation = createAnimation(t);
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animation.timeline = scrollTimeline;
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// Range name is ignored while attached to a non-view scroll-timeline.
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// Offsets are still applied to the scroll-timeline.
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animation.rangeStart = { rangeName: 'contain', offset: CSS.percent(10) };
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animation.rangeEnd = { rangeName: 'contain', offset: CSS.percent(90) };
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await animation.ready;
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assert_scroll_synced_times(animation, 10, 0);
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assert_percents_equal(animation.startTime, 10);
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animation.timeline = view_timeline;
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assert_true(animation.pending);
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await animation.ready;
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// Cover range is [0px, 300px]
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// Contain range is [100px, 200px]
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// start time = (contain 10% pos - cover start pos) / cover range * 100%
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const expected_start_time = 110 / 300 * 100;
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// timeline time = (scroll pos - cover start pos) / cover range * 100%
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const expected_timeline_time = 100 / 300 * 100;
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// current time = timeline time - start time.
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const expected_current_time = expected_timeline_time - expected_start_time;
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assert_percents_equal(animation.startTime, expected_start_time);
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assert_percents_equal(animation.timeline.currentTime, expected_timeline_time);
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assert_percents_equal(animation.currentTime, expected_current_time);
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}, 'Changing from a scroll-timeline to a view-timeline updates start time.');
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</script>
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</body>
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