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<!DOCTYPE html>
<html id="top">
<meta charset="utf-8">
<title>View timeline current-time</title>
<link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#viewtimeline-interface">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="/scroll-animations/scroll-timelines/testcommon.js"></script>
<script src="/scroll-animations/view-timelines/testcommon.js"></script>
<style>
#container {
border: 10px solid lightgray;
overflow-y: scroll;
height: 200px;
width: 200px;
}
.spacer {
height: 800px;
}
#target {
background-color: green;
height: 200px;
width: 100px;
}
</style>
<body>
<div id="container">
<div id="leading-space" class="spacer"></div>
<div id="target"></div>
<div id="trailing-space" class="spacer"></div>
</div>
</body>
<script type="text/javascript">
promise_test(async t => {
container.scrollTop = 0;
await waitForNextFrame();
const anim = CreateViewTimelineOpacityAnimation(t, target);
const timeline = anim.timeline;
await anim.ready;
// Initially before start-offset and animation effect is in the before
// phase.
assert_percents_equal(timeline.currentTime, -150,
"Timeline's currentTime at container start boundary");
assert_percents_equal(anim.currentTime, -150,
"Animation's currentTime at container start boundary");
assert_equals(getComputedStyle(target).opacity, "1",
'Effect is inactive in the before phase');
// Advance to the start offset, which triggers entry to the active phase.
container.scrollTop = 600;
await waitForNextFrame();
assert_percents_equal(timeline.currentTime, 0,
"Timeline's current time at start offset");
assert_percents_equal(anim.currentTime, 0,
"Animation's current time at start offset");
assert_equals(getComputedStyle(target).opacity, '0.3',
'Effect at the start of the active phase');
// Advance to the midpoint of the animation.
container.scrollTop = 800;
await waitForNextFrame();
assert_percents_equal(timeline.currentTime, 50,
"Timeline's currentTime at midpoint");
assert_percents_equal(anim.currentTime, 50,
"Animation's currentTime at midpoint");
assert_equals(getComputedStyle(target).opacity,'0.5',
'Effect at the midpoint of the active range');
// Advance to the end of the animation.
container.scrollTop = 1000;
await waitForNextFrame();
assert_percents_equal(timeline.currentTime, 100,
"Timeline's currentTime at end offset");
assert_percents_equal(anim.currentTime, 100,
"Animation's currentTime at end offset");
assert_equals(getComputedStyle(target).opacity, '0.7',
'Effect is in the after phase at effect end time');
// Advance to the scroll limit.
container.scrollTop = 1600;
await waitForNextFrame();
assert_percents_equal(timeline.currentTime, 250,
"Timeline's currentTime at scroll limit");
// Hold time set when the animation finishes, which clamps the value of
// the animation's currentTime.
assert_percents_equal(anim.currentTime, 100,
"Animation's currentTime at scroll limit");
// In the after phase, so the effect should not be applied.
assert_equals(getComputedStyle(target).opacity, '1',
'After phase at scroll limit');
}, 'View timeline with start and end scroll offsets that do not align with ' +
'the scroll boundaries' );
promise_test(async t => {
const leading = document.getElementById('leading-space');
leading.style = 'display: none';
t.add_cleanup(() => {
leading.style = null;
});
container.scrollTop = 0;
await waitForNextFrame();
const anim = CreateViewTimelineOpacityAnimation(t, target);
const timeline = anim.timeline;
await anim.ready;
assert_percents_equal(timeline.currentTime, 50,
"Timeline's currentTime at container start boundary");
assert_percents_equal(anim.currentTime, 50,
"Animation's currentTime at container start boundary");
assert_equals(getComputedStyle(target).opacity, "0.5",
'Effect enters active phase at container start boundary');
// Advance to midpoint
container.scrollTop = 100;
await waitForNextFrame();
assert_percents_equal(timeline.currentTime, 75,
"Timeline's current time at midpoint");
assert_percents_equal(anim.currentTime, 75,
"Animation's current time at midpoint");
assert_equals(getComputedStyle(target).opacity, '0.6',
'Effect at the middle of the active phase');
// Advance to end-offset
container.scrollTop = 200;
await waitForNextFrame();
assert_percents_equal(timeline.currentTime, 100,
"Timeline's current time at end offset");
assert_percents_equal(anim.currentTime, 100,
"Animation's current time at end offset");
assert_equals(getComputedStyle(target).opacity, '0.7',
'Effect inactive at the end offset');
// Advance to scroll limit.
container.scrollTop = 800;
await waitForNextFrame();
assert_percents_equal(timeline.currentTime, 250,
"Timeline's current time at scroll limit");
assert_percents_equal(anim.currentTime, 100,
"Animation's current time at scroll limit");
assert_equals(getComputedStyle(target).opacity, '1',
'Effect inactive in the after phase');
}, 'View timeline does not clamp starting scroll offset at 0');
promise_test(async t => {
const trailing = document.getElementById('trailing-space');
trailing.style = 'display: none';
t.add_cleanup(() => {
trailing.style = null;
});
container.scrollTop = 0;
await waitForNextFrame();
const anim = CreateViewTimelineOpacityAnimation(t, target);
const timeline = anim.timeline;
await anim.ready;
// Initially in before phase.
assert_percents_equal(timeline.currentTime, -150,
"Timeline's currentTime at container start boundary");
assert_percents_equal(anim.currentTime, -150,
"Animation's currentTime at container start boundary");
assert_equals(getComputedStyle(target).opacity, "1",
'Effect enters active phase at container start boundary');
// Advance to start offset.
container.scrollTop = 600;
await waitForNextFrame();
assert_percents_equal(timeline.currentTime, 0,
"Timeline's current time at start offset");
assert_percents_equal(anim.currentTime, 0,
"Animation's current time at start offset");
assert_equals(getComputedStyle(target).opacity, '0.3',
'Effect at the start of the active phase');
// Advance to midpoint.
container.scrollTop = 700;
await waitForNextFrame();
assert_percents_equal(timeline.currentTime, 25,
"Timeline's current time at the midpoint");
assert_percents_equal(anim.currentTime, 25,
"Animation's current time at the midpoint");
assert_equals(getComputedStyle(target).opacity, '0.4',
'Effect at the midpoint of the active phase');
// Advance to end offset.
container.scrollTop = 800;
await waitForNextFrame();
assert_percents_equal(timeline.currentTime, 50,
"Timeline's currentTime at max scroll offset");
assert_percents_equal(anim.currentTime, 50,
"Animation's currentTime at max scroll offset");
// The active-after boundary is inclusive since at the maximum scroll
// position.
assert_equals(getComputedStyle(target).opacity, "0.5",
'Effect at end of active phase');
}, 'View timeline does not clamp end scroll offset at max scroll');
</script>
</html>
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