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153 lines
5.5 KiB
HTML
153 lines
5.5 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<title>ScrollTimeline invalidation</title>
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<link rel="help" href="https://wicg.github.io/scroll-animations/#current-time-algorithm">
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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: auto;
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height: 100px;
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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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height: 1000px;
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width: 100%;
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}
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</style>
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<div id="log"></div>
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<script>
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'use strict';
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promise_test(async t => {
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const animation = createScrollLinkedAnimation(t);
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const effect_duration = 350;
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animation.effect.updateTiming({ duration: effect_duration });
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const scroller = animation.timeline.source;
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let maxScroll = scroller.scrollHeight - scroller.clientHeight;
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scroller.scrollTop = 0.2 * maxScroll;
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const initial_progress = (scroller.scrollTop / maxScroll) * 100;
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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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await waitForNextFrame();
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animation.play();
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await animation.ready;
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// Animation current time is at 20% because scroller was scrolled to 20%
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// assert_equals(animation.currentTime.value, 20);
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assert_equals(animation.currentTime.value, 20);
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assert_equals(scroller.scrollTop, 180);
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assert_equals(maxScroll, 900);
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// Shrink scroller content size (from 1000 to 500).
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// scroller.scrollTop maintains the same offset, which means shrinking the
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// content has the effect of skipping the animation forward.
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scroller.firstChild.style.height = "500px";
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maxScroll = scroller.scrollHeight - scroller.clientHeight;
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assert_equals(scroller.scrollTop, 180);
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assert_equals(maxScroll, 400);
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await waitForNextFrame();
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const expected_progress = (scroller.scrollTop / maxScroll) * 100;
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assert_true(expected_progress > initial_progress)
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assert_equals(animation.currentTime.value, expected_progress); // 45%
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assert_equals(animation.timeline.currentTime.value, expected_progress); // 45%
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assert_equals(animation.effect.getComputedTiming().localTime.value, expected_progress); // 45%
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}, 'Animation current time and effect local time are updated after scroller ' +
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'content size changes.');
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promise_test(async t => {
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const animation = createScrollLinkedAnimation(t);
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animation.effect.updateTiming({ duration: 350 });
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const scroller = animation.timeline.source;
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let maxScroll = scroller.scrollHeight - scroller.clientHeight;
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const scrollOffset = 0.2 * maxScroll
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scroller.scrollTop = scrollOffset;
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const initial_progress = (scroller.scrollTop / maxScroll) * 100;
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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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await waitForNextFrame();
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animation.play();
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await animation.ready;
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// Animation current time is at 20% because scroller was scrolled to 20%
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// assert_equals(animation.currentTime.value, 20);
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assert_equals(animation.currentTime.value, 20);
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assert_equals(scroller.scrollTop, scrollOffset);
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assert_equals(maxScroll, 900);
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// Change scroller size.
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scroller.style.height = "500px";
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maxScroll = scroller.scrollHeight - scroller.clientHeight;
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assert_equals(scroller.scrollTop, scrollOffset);
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assert_equals(maxScroll, 500);
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await waitForNextFrame();
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const expected_progress = (scroller.scrollTop / maxScroll) * 100;
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assert_true(expected_progress > initial_progress);
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assert_equals(animation.currentTime.value, expected_progress); // 45%
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assert_equals(animation.timeline.currentTime.value, expected_progress); // 45%
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assert_equals(animation.effect.getComputedTiming().localTime.value, expected_progress); // 45%
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}, 'Animation current time and effect local time are updated after scroller ' +
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'size changes.');
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promise_test(async t => {
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await waitForNextFrame();
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const timeline = createScrollTimeline(t);
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const scroller = timeline.source;
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const maxScroll = scroller.scrollHeight - scroller.clientHeight;
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// Instantiate scroll animation that resizes its scroll timeline scroller.
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const animation = new Animation(
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new KeyframeEffect(
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timeline.source.firstChild,
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[{ height: '1000px' }, { height: '2000px' }],
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{ duration: 1000, }
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), timeline);
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animation.play();
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await animation.ready;
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await waitForNextFrame();
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scroller.scrollTop = 0.2 * maxScroll;
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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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await waitForNextFrame();
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// Let s = scroll position
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// p = fractional progress
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// v = viewport height
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// c = scroll height
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// c[i] = c[i-1] * (1 + p[i-1])
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// p[i] = s / (c[i-1] - v)
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// c[0] = 1000
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// p[0] = 0.2 ==> s = 180
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// c[1] = 1000 * 1.2 = 1200
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assert_percents_equal(timeline.currentTime, 20,
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'Timeline current time is updated after animation frame.');
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assert_equals(scroller.scrollHeight, 1200);
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await waitForNextFrame();
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// Applying the animation effect alters the height of the scroll content and
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// makes the scroll timeline stale.
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// https://github.com/w3c/csswg-drafts/issues/8694
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// p[1] = 180 / (1200 - 100) = 0.16363636363
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// c[2] = 1000 * 1.16363636363 = 1163.6363 => 1164
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// p[2] = 180 / (1164 - 100) = 0.1692
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// c[3] = 1169
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assert_percents_equal(timeline.currentTime, 16.92,
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'Timeline current time is updated after two animation frames and ' +
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'reflects single layout run.');
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assert_approx_equals(scroller.scrollHeight, 1169, 1);
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}, 'If scroll animation resizes its scroll timeline scroller, ' +
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'layout reruns once per frame.');
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</script>
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