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<!DOCTYPE html>
<html>
<head>
<link rel="help" src="https://drafts.csswg.org/css-animations-2/#animation-trigger">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<script src="support/support.js"></script>
</head>
<body>
<style>
.subject, .target {
height: 50px;
width: 50px;
background-color: red;
}
.scroller {
overflow-y: scroll;
height: 500px;
width: 500px;
border: solid 1px;
position: relative;
}
#space {
width: 50px;
height: 600px;
}
</style>
<div id="wrapper">
<div id="scroller" class="scroller">
<div id="space"></div>
<div id="subject" class="subject"></div>
<div id="space"></div>
</div>
<div id="target" class="target"></div>
</div>
<script>
// The trigger and exit ranges are the same for this test.
const TRIGGER_START_PX = 150;
const TRIGGER_END_PX = 200;
const scroller = document.getElementById("scroller");
const target = document.getElementById("target");
const COVER_START_OFFSET = 100;
const rangeBoundaries = getRangeBoundariesForTest(
COVER_START_OFFSET + TRIGGER_START_PX,
COVER_START_OFFSET + TRIGGER_END_PX,
COVER_START_OFFSET + TRIGGER_START_PX,
COVER_START_OFFSET + TRIGGER_END_PX,
scroller);
const ANIMATION_DURATION_MS = 1;
const view_timeline = new ViewTimeline({ subject: subject });
function setupAnimation() {
const animation = new Animation(
new KeyframeEffect(
target,
[
{ transform: "scaleX(1)", backgroundColor: "pink", left: "0px" },
{ transform: "scaleX(5)", backgroundColor: "pink", left: "10px" }
],
{ duration: ANIMATION_DURATION_MS, fill: "both" }
));
return animation;
}
function setupAnimationTrigger(use_default_trigger=false) {
const trigger = use_default_trigger ? new AnimationTrigger()
: new AnimationTrigger({
behavior: "alternate",
timeline: view_timeline,
rangeStart: `${TRIGGER_START_PX}px`,
rangeEnd: `${TRIGGER_END_PX}px`
});
return trigger;
}
promise_test(async (test) => {
const animation = setupAnimation();
const trigger = setupAnimationTrigger(/*use_default_trigger=*/true);
// As the default trigger is always in the tripped state, the animation
// should be played right away.
trigger.addAnimation(animation);
await animation.finished;
assert_times_equal(animation.currentTime, ANIMATION_DURATION_MS,
"animation finish reflected in currentTime");
assert_equals(animation.playState, "finished",
"animation finish reflected in playeState");
}, "Animation attached to tripped (default) trigger plays.");
promise_test(async (test) => {
const animation = setupAnimation();
const trigger = setupAnimationTrigger();
assert_equals(animation.playState, "idle", "animation is idle");
assert_equals(animation.currentTime, null, "currentTime is null");
assert_equals(scroller.scrollTop, 0, "scroller is not scrolled, i.e. " +
"not within the trigger range");
trigger.addAnimation(animation);
await waitForAnimationFrames(2);
assert_equals(animation.playState, "paused",
"animation is paused, awaiting trigger event");
assert_times_equal(animation.currentTime, 0, "currentTime is 0");
// Entering the trigger range should play the animation.
rangeBoundaries.enterTriggerRange();
await animation.finished;
assert_equals(animation.playState, "finished",
"animation is paused, awaiting trigger event");
assert_times_equal(animation.currentTime, ANIMATION_DURATION_MS,
"currentTime is 0");
}, "Animation attached to untripped trigger is paused at the beginning.");
promise_test(async (test) => {
await waitForScrollReset(test, scroller);
assert_equals(scroller.scrollTop, 0, "scroller is not scrolled, i.e. " +
"not within the trigger range");
const animation = setupAnimation();
const trigger = setupAnimationTrigger();
assert_equals(animation.playState, "idle", "animation is idle");
assert_equals(animation.currentTime, null, "currentTime is null");
rangeBoundaries.enterTriggerRange();
await waitForAnimationFrames(2);
assert_equals(animation.playState, "idle", "animation is still idle");
assert_equals(animation.currentTime, null, "currentTime is still null");
trigger.addAnimation(animation);
await animation.finished;
assert_equals(animation.playState, "finished",
"animation is paused, awaiting trigger event");
assert_times_equal(animation.currentTime, ANIMATION_DURATION_MS,
`currentTime is ${ANIMATION_DURATION_MS}`);
}, "Animation attached to tripped trigger is played immediately.");
</script>
</body>
</html>
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