animation-events.html (2606B)
1 <!DOCTYPE html> 2 <html id="top"> 3 <meta charset="utf-8"> 4 <title>View timeline delay</title> 5 <link rel="help" href="https://drafts.csswg.org/scroll-animations-1/#events"> 6 <script src="/resources/testharness.js"></script> 7 <script src="/resources/testharnessreport.js"></script> 8 <script src="/web-animations/testcommon.js"></script> 9 <style> 10 #container { 11 border: 10px solid lightgray; 12 overflow: auto; 13 height: 200px; 14 width: 200px; 15 } 16 .spacer { 17 height: 400px; 18 } 19 #target { 20 background-color: green; 21 height: 100px; 22 } 23 </style> 24 <body> 25 <div id="container"> 26 <div class="spacer"></div> 27 <div id="target"></div> 28 <div class="spacer"></div> 29 </div> 30 </body> 31 <script type="text/javascript"> 32 const keyframes = {transform: ['translateX(0)', 'translateX(100px)']}; 33 let target = document.getElementById('target'); 34 let scroller = document.querySelector('#container'); 35 let timeline = new ViewTimeline({subject: target}); 36 promise_test(async t => { 37 let animation = target.animate(keyframes, { 38 timeline, 39 fill: 'both' 40 }); 41 scroller.scrollTo({top: 0}); 42 await waitForCompositorReady(); 43 let finishedPromise = animation.finished; 44 let finished = false; 45 let finishEvents = 0; 46 finishedPromise.then(() => { 47 finished = true; 48 }); 49 animation.addEventListener('finish', () => { finishEvents++; }); 50 51 scroller.scrollTo({top: 100}); 52 await waitForNextFrame(); 53 assert_false(finished, "Animation is not finished before starting"); 54 assert_equals(finishEvents, 0, "No finish event before scrolling"); 55 56 scroller.scrollTo({top: 400}); 57 await waitForNextFrame(); 58 assert_false(finished, "Animation is not finished while active"); 59 assert_equals(finishEvents, 0, "No finish event while active"); 60 61 scroller.scrollTo({top: 600}); 62 await waitForNextFrame(); 63 assert_true(finished, "Animation is finished after passing end"); 64 assert_equals(finishEvents, 1, "A finish event is generated after end"); 65 66 scroller.scrollTo({top: 400}); 67 await waitForNextFrame(); 68 assert_not_equals(finishedPromise, animation.finished, 69 "A new finish promise is created when back in active range"); 70 finished = false; 71 animation.finished.then(() => { 72 finished = true; 73 }); 74 75 scroller.scrollTo({top: 600}); 76 await waitForNextFrame(); 77 assert_true(finished, "Finishes after passing end"); 78 assert_equals(finishEvents, 2, "Another finish event is generated after end"); 79 animation.cancel(); 80 }, 'View timeline generates and resolves finish promises and events' ); 81 82 83 </script>