| <!DOCTYPE html> |
| <html id="top"> |
| <meta charset="utf-8"> |
| <title>View timeline delay</title> |
| <link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#events"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/web-animations/testcommon.js"></script> |
| <style> |
| #container { |
| border: 10px solid lightgray; |
| overflow: auto; |
| height: 200px; |
| width: 200px; |
| } |
| .spacer { |
| height: 400px; |
| } |
| #target { |
| background-color: green; |
| height: 100px; |
| } |
| </style> |
| <body> |
| <div id="container"> |
| <div class="spacer"></div> |
| <div id="target"></div> |
| <div class="spacer"></div> |
| </div> |
| </body> |
| <script type="text/javascript"> |
| const keyframes = {transform: ['translateX(0)', 'translateX(100px)']}; |
| let target = document.getElementById('target'); |
| let scroller = document.querySelector('#container'); |
| let timeline = new ViewTimeline({subject: target}); |
| promise_test(async t => { |
| let animation = target.animate(keyframes, { |
| timeline, |
| fill: 'both' |
| }); |
| scroller.scrollTo({top: 0}); |
| await waitForCompositorReady(); |
| let finishedPromise = animation.finished; |
| let finished = false; |
| let finishEvents = 0; |
| finishedPromise.then(() => { |
| finished = true; |
| }); |
| animation.addEventListener('finish', () => { finishEvents++; }); |
| |
| scroller.scrollTo({top: 100}); |
| await waitForNextFrame(); |
| assert_false(finished, "Animation is not finished before starting"); |
| assert_equals(finishEvents, 0, "No finish event before scrolling"); |
| |
| scroller.scrollTo({top: 400}); |
| await waitForNextFrame(); |
| assert_false(finished, "Animation is not finished while active"); |
| assert_equals(finishEvents, 0, "No finish event while active"); |
| |
| scroller.scrollTo({top: 600}); |
| await waitForNextFrame(); |
| assert_true(finished, "Animation is finished after passing end"); |
| assert_equals(finishEvents, 1, "A finish event is generated after end"); |
| |
| scroller.scrollTo({top: 400}); |
| await waitForNextFrame(); |
| assert_not_equals(finishedPromise, animation.finished, |
| "A new finish promise is created when back in active range"); |
| finished = false; |
| animation.finished.then(() => { |
| finished = true; |
| }); |
| |
| scroller.scrollTo({top: 600}); |
| await waitForNextFrame(); |
| assert_true(finished, "Finishes after passing end"); |
| assert_equals(finishEvents, 2, "Another finish event is generated after end"); |
| animation.cancel(); |
| }, 'View timeline generates and resolves finish promises and events' ); |
| |
| |
| </script> |
