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<title>CSS transition event dispatch</title>
<link rel="help" href="https://drafts.csswg.org/css-transitions-2/#event-dispatch">
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'use strict';
// All transition events should be received on the next animation frame. If
// two animation frames pass before receiving the expected events then we
// can immediately fail the current test.
const transitionEventsTimeout = () => {
return waitForAnimationFrames(2);
};
const setupTransition = (t, transitionStyle) => {
const div = addDiv(t, { style: 'transition: ' + transitionStyle });
const watcher = new EventWatcher(t, div, [ 'transitionrun',
'transitionstart',
'transitionend',
'transitioncancel' ],
transitionEventsTimeout);
getComputedStyle(div).marginLeft;
div.style.marginLeft = '100px';
const transition = div.getAnimations()[0];
return { transition, watcher, div };
};
// On the next frame (i.e. when events are queued), whether or not the
// transition is still pending depends on the implementation.
promise_test(async t => {
const { transition, watcher } =
setupTransition(t, 'margin-left 100s 100s');
const evt = await watcher.wait_for('transitionrun');
assert_equals(evt.elapsedTime, 0.0);
}, 'Idle -> Pending or Before');
promise_test(async t => {
const { transition, watcher } =
setupTransition(t, 'margin-left 100s 100s');
// Force the transition to leave the idle phase
transition.startTime = document.timeline.currentTime;
const evt = await watcher.wait_for('transitionrun');
assert_equals(evt.elapsedTime, 0.0);
}, 'Idle -> Before');
promise_test(async t => {
const { transition, watcher } = setupTransition(t, 'margin-left 100s 100s');
// Seek to Active phase.
transition.currentTime = 100 * MS_PER_SEC;
transition.pause();
const events = await watcher.wait_for(['transitionrun', 'transitionstart'], {
record: 'all',
});
assert_equals(events[0].elapsedTime, 0.0);
assert_equals(events[1].elapsedTime, 0.0);
}, 'Idle or Pending -> Active');
promise_test(async t => {
const { transition, watcher } = setupTransition(t, 'margin-left 100s 100s');
// Seek to After phase.
transition.finish();
const events = await watcher.wait_for(
['transitionrun', 'transitionstart', 'transitionend'],
{
record: 'all',
}
);
assert_equals(events[0].elapsedTime, 0.0);
assert_equals(events[1].elapsedTime, 0.0);
assert_equals(events[2].elapsedTime, 100.0);
}, 'Idle or Pending -> After');
promise_test(async t => {
const { transition, watcher, div } =
setupTransition(t, 'margin-left 100s 100s');
await Promise.all([ watcher.wait_for('transitionrun'), transition.ready ]);
// Make idle
div.style.display = 'none';
getComputedStyle(div).marginLeft;
const evt = await watcher.wait_for('transitioncancel');
assert_equals(evt.elapsedTime, 0.0);
}, 'Before -> Idle (display: none)');
promise_test(async t => {
const { transition, watcher } =
setupTransition(t, 'margin-left 100s 100s');
await Promise.all([ watcher.wait_for('transitionrun'), transition.ready ]);
// Make idle
transition.timeline = null;
const evt = await watcher.wait_for('transitioncancel');
assert_equals(evt.elapsedTime, 0.0);
}, 'Before -> Idle (Animation.timeline = null)');
promise_test(async t => {
const { transition, watcher } =
setupTransition(t, 'margin-left 100s 100s');
await Promise.all([ watcher.wait_for('transitionrun'), transition.ready ]);
transition.currentTime = 100 * MS_PER_SEC;
const evt = await watcher.wait_for('transitionstart');
assert_equals(evt.elapsedTime, 0.0);
}, 'Before -> Active');
promise_test(async t => {
const { transition, watcher } = setupTransition(t, 'margin-left 100s 100s');
await Promise.all([ watcher.wait_for('transitionrun'), transition.ready ]);
// Seek to After phase.
transition.currentTime = 200 * MS_PER_SEC;
const events = await watcher.wait_for(['transitionstart', 'transitionend'], {
record: 'all',
});
assert_equals(events[0].elapsedTime, 0.0);
assert_equals(events[1].elapsedTime, 100.0);
}, 'Before -> After');
promise_test(async t => {
const { transition, watcher, div } = setupTransition(t, 'margin-left 100s');
// Seek to Active start position.
transition.pause();
await watcher.wait_for([ 'transitionrun', 'transitionstart' ]);
// Make idle
div.style.display = 'none';
getComputedStyle(div).marginLeft;
const evt = await watcher.wait_for('transitioncancel');
assert_equals(evt.elapsedTime, 0.0);
}, 'Active -> Idle, no delay (display: none)');
promise_test(async t => {
const { transition, watcher } = setupTransition(t, 'margin-left 100s');
await watcher.wait_for([ 'transitionrun', 'transitionstart' ]);
// Make idle
transition.currentTime = 0;
transition.timeline = null;
const evt = await watcher.wait_for('transitioncancel');
assert_equals(evt.elapsedTime, 0.0);
}, 'Active -> Idle, no delay (Animation.timeline = null)');
promise_test(async t => {
const { transition, watcher, div } =
setupTransition(t, 'margin-left 100s 100s');
// Pause so the currentTime is fixed and we can accurately compare the event
// time in transition cancel events.
transition.pause();
// Seek to Active phase.
transition.currentTime = 100 * MS_PER_SEC;
await watcher.wait_for([ 'transitionrun', 'transitionstart' ]);
// Make idle
div.style.display = 'none';
getComputedStyle(div).marginLeft;
const evt = await watcher.wait_for('transitioncancel');
assert_equals(evt.elapsedTime, 0.0);
}, 'Active -> Idle, with positive delay (display: none)');
promise_test(async t => {
const { transition, watcher } = setupTransition(t, 'margin-left 100s 100s');
// Seek to Active phase.
transition.currentTime = 100 * MS_PER_SEC;
await watcher.wait_for([ 'transitionrun', 'transitionstart' ]);
// Make idle
transition.currentTime = 100 * MS_PER_SEC;
transition.timeline = null;
const evt = await watcher.wait_for('transitioncancel');
assert_equals(evt.elapsedTime, 0.0);
}, 'Active -> Idle, with positive delay (Animation.timeline = null)');
promise_test(async t => {
const { transition, watcher, div } =
setupTransition(t, 'margin-left 100s -50s');
// Pause so the currentTime is fixed and we can accurately compare the event
// time in transition cancel events.
transition.pause();
await watcher.wait_for([ 'transitionrun', 'transitionstart' ]);
// Make idle
div.style.display = 'none';
getComputedStyle(div).marginLeft;
const evt = await watcher.wait_for('transitioncancel');
assert_equals(evt.elapsedTime, 50.0);
}, 'Active -> Idle, with negative delay (display: none)');
promise_test(async t => {
const { transition, watcher } = setupTransition(t, 'margin-left 100s -50s');
await watcher.wait_for([ 'transitionrun', 'transitionstart' ]);
// Make idle
transition.currentTime = 50 * MS_PER_SEC;
transition.timeline = null;
const evt = await watcher.wait_for('transitioncancel');
assert_equals(evt.elapsedTime, 0.0);
}, 'Active -> Idle, with negative delay (Animation.timeline = null)');
promise_test(async t => {
const { transition, watcher } = setupTransition(t, 'margin-left 100s 100s');
// Seek to Active phase.
transition.currentTime = 100 * MS_PER_SEC;
await watcher.wait_for([ 'transitionrun', 'transitionstart' ]);
// Seek to Before phase.
transition.currentTime = 0;
const evt = await watcher.wait_for('transitionend');
assert_equals(evt.elapsedTime, 0.0);
}, 'Active -> Before');
promise_test(async t => {
const { transition, watcher } = setupTransition(t, 'margin-left 100s 100s');
// Seek to Active phase.
transition.currentTime = 100 * MS_PER_SEC;
await watcher.wait_for([ 'transitionrun', 'transitionstart' ]);
// Seek to After phase.
transition.currentTime = 200 * MS_PER_SEC;
const evt = await watcher.wait_for('transitionend');
assert_equals(evt.elapsedTime, 100.0);
}, 'Active -> After');
promise_test(async t => {
const { transition, watcher } = setupTransition(t, 'margin-left 100s 100s');
// Seek to After phase.
transition.finish();
await watcher.wait_for([ 'transitionrun',
'transitionstart',
'transitionend' ]);
// Seek to Before phase.
transition.currentTime = 0;
const events = await watcher.wait_for(['transitionstart', 'transitionend'], {
record: 'all',
});
assert_equals(events[0].elapsedTime, 100.0);
assert_equals(events[1].elapsedTime, 0.0);
}, 'After -> Before');
promise_test(async t => {
const { transition, watcher } = setupTransition(t, 'margin-left 100s 100s');
// Seek to After phase.
transition.finish();
await watcher.wait_for([ 'transitionrun',
'transitionstart',
'transitionend' ]);
// Seek to Active phase.
transition.currentTime = 100 * MS_PER_SEC;
const evt = await watcher.wait_for('transitionstart');
assert_equals(evt.elapsedTime, 100.0);
}, 'After -> Active');
promise_test(async t => {
const { transition, watcher } = setupTransition(t, 'margin-left 100s -50s');
const events = await watcher.wait_for(['transitionrun', 'transitionstart'], {
record: 'all',
});
assert_equals(events[0].elapsedTime, 50.0);
assert_equals(events[1].elapsedTime, 50.0);
transition.finish();
const evt = await watcher.wait_for('transitionend');
assert_equals(evt.elapsedTime, 100.0);
}, 'Calculating the interval start and end time with negative start delay.');
promise_test(async t => {
const { transition, watcher, div } = setupTransition(
t,
'margin-left 100s 100s'
);
await watcher.wait_for('transitionrun');
// We can't set the end delay via generated effect timing
// because mutating CSS transitions is not specced yet.
transition.effect = new KeyframeEffect(
div,
{ marginLeft: ['0px', '100px'] },
{
duration: 100 * MS_PER_SEC,
endDelay: -50 * MS_PER_SEC,
}
);
// Seek to Before and play.
transition.cancel();
transition.play();
const events = await watcher.wait_for(
['transitioncancel', 'transitionrun', 'transitionstart'],
{ record: 'all' }
);
assert_equals(events[2].elapsedTime, 0.0);
// Seek to After phase.
transition.finish();
const evt = await watcher.wait_for('transitionend');
assert_equals(evt.elapsedTime, 50.0);
}, 'Calculating the interval start and end time with negative end delay.');
promise_test(async t => {
const { transition, watcher, div } =
setupTransition(t, 'margin-left 100s 100s');
await watcher.wait_for('transitionrun');
// Make idle
div.style.display = 'none';
getComputedStyle(div).marginLeft;
await watcher.wait_for('transitioncancel');
transition.cancel();
// Then wait a couple of frames and check that no event was dispatched
await waitForAnimationFrames(2);
}, 'Call Animation.cancel after canceling transition.');
promise_test(async t => {
const { transition, watcher, div } =
setupTransition(t, 'margin-left 100s 100s');
await watcher.wait_for('transitionrun');
// Make idle
transition.cancel();
transition.play();
await watcher.wait_for([ 'transitioncancel',
'transitionrun' ]);
}, 'Restart transition after canceling transition immediately');
promise_test(async t => {
const { transition, watcher, div } =
setupTransition(t, 'margin-left 100s 100s');
await watcher.wait_for('transitionrun');
// Make idle
div.style.display = 'none';
getComputedStyle(div).marginLeft;
transition.play();
transition.cancel();
await watcher.wait_for('transitioncancel');
// Then wait a couple of frames and check that no event was dispatched
await waitForAnimationFrames(2);
}, 'Call Animation.cancel after restarting transition immediately');
promise_test(async t => {
const { transition, watcher } = setupTransition(t, 'margin-left 100s');
await watcher.wait_for([ 'transitionrun', 'transitionstart' ]);
// Make idle
transition.timeline = null;
await watcher.wait_for('transitioncancel');
transition.timeline = document.timeline;
transition.play();
await watcher.wait_for(['transitionrun', 'transitionstart']);
}, 'Set timeline and play transition after clear the timeline');
promise_test(async t => {
const { transition, watcher, div } =
setupTransition(t, 'margin-left 100s');
await watcher.wait_for([ 'transitionrun', 'transitionstart' ]);
transition.cancel();
await watcher.wait_for('transitioncancel');
// Make After phase
transition.effect = null;
// Then wait a couple of frames and check that no event was dispatched
await waitForAnimationFrames(2);
}, 'Set null target effect after canceling the transition');
promise_test(async t => {
const { transition, watcher, div } = setupTransition(t, 'margin-left 100s');
await watcher.wait_for([ 'transitionrun', 'transitionstart' ]);
transition.effect = null;
await watcher.wait_for('transitionend');
transition.cancel();
// Then wait a couple of frames and check that no event was dispatched
await waitForAnimationFrames(2);
}, 'Cancel the transition after clearing the target effect');
promise_test(async t => {
const { transition, watcher, div } = setupTransition(t, 'margin-left 100s');
// Seek to After phase.
transition.finish();
const events = await watcher.wait_for(
['transitionrun', 'transitionstart', 'transitionend'],
{
record: 'all',
}
);
transition.cancel();
// Then wait a couple of frames and check that no event was dispatched
await waitForAnimationFrames(2);
}, 'Cancel the transition after it finishes');
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