| <!DOCTYPE html> |
| <meta charset=utf-8> |
| <title>Reversing an animation</title> |
| <link rel="help" |
| href="https://drafts.csswg.org/web-animations/#reversing-an-animation-section"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/web-animations/testcommon.js"></script> |
| <script src="testcommon.js"></script> |
| <style> |
| .scroller { |
| overflow: auto; |
| height: 100px; |
| width: 100px; |
| will-change: transform; |
| } |
| |
| .contents { |
| height: 1000px; |
| width: 100%; |
| } |
| </style> |
| <body> |
| <script> |
| 'use strict'; |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| await animation.ready; |
| |
| animation.currentTime = 500; |
| const previousPlaybackRate = animation.playbackRate; |
| animation.reverse(); |
| assert_equals(animation.playbackRate, previousPlaybackRate, |
| 'Playback rate should not have changed'); |
| await animation.ready; |
| |
| assert_equals(animation.playbackRate, -previousPlaybackRate, |
| 'Playback rate should be inverted'); |
| }, 'Reversing an animation inverts the playback rate'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| animation.currentTime = 500; |
| animation.reverse(); |
| |
| assert_equals(animation.currentTime, 500, |
| 'The current time should not change it is in the middle of ' + |
| 'the animation duration'); |
| }, 'Reversing an animation maintains the same current time'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| assert_true(animation.pending, |
| 'The animation is pending before we call reverse'); |
| |
| animation.reverse(); |
| |
| assert_true(animation.pending, |
| 'The animation is still pending after calling reverse'); |
| }, 'Reversing an animation does not cause it to leave the pending state'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| let readyResolved = false; |
| animation.ready.then(() => { readyResolved = true; }); |
| |
| animation.reverse(); |
| |
| await Promise.resolve(); |
| assert_false(readyResolved, |
| 'ready promise should not have been resolved yet'); |
| }, 'Reversing an animation does not cause it to resolve the ready promise'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| animation.currentTime = 2000; |
| animation.reverse(); |
| |
| assert_equals(animation.currentTime, 1000, |
| 'reverse() should start playing from the animation effect end ' + |
| 'if the playbackRate > 0 and the currentTime > effect end'); |
| }, 'Reversing an animation when playbackRate > 0 and currentTime > ' + |
| 'effect end should make it play from the end'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| |
| animation.currentTime = -2000; |
| animation.reverse(); |
| |
| assert_equals(animation.currentTime, 1000, |
| 'reverse() should start playing from the animation effect end ' + |
| 'if the playbackRate > 0 and the currentTime < 0'); |
| }, 'Reversing an animation when playbackRate > 0 and currentTime < 0 ' + |
| 'should make it play from the end'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| animation.playbackRate = -1; |
| animation.currentTime = -2000; |
| animation.reverse(); |
| |
| assert_times_equal(animation.currentTime, 0, |
| 'reverse() should start playing from the start of animation time ' + |
| 'if the playbackRate < 0 and the currentTime < 0'); |
| }, 'Reversing an animation when playbackRate < 0 and currentTime < 0 ' + |
| 'should make it play from the start'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| animation.playbackRate = -1; |
| animation.currentTime = 2000; |
| animation.reverse(); |
| |
| assert_times_equal(animation.currentTime, 0, |
| 'reverse() should start playing from the start of animation time ' + |
| 'if the playbackRate < 0 and the currentTime > effect end'); |
| }, 'Reversing an animation when playbackRate < 0 and currentTime > effect ' + |
| 'end should make it play from the start'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| animation.effect.updateTiming({ iterations: Infinity }); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| |
| animation.currentTime = -2000; |
| |
| assert_throws_dom('InvalidStateError', |
| () => { animation.reverse(); }, |
| 'reverse() should throw InvalidStateError ' + |
| 'if the playbackRate > 0 and the currentTime < 0 ' + |
| 'and the target effect is positive infinity'); |
| }, 'Reversing an animation when playbackRate > 0 and currentTime < 0 ' + |
| 'and the target effect end is positive infinity should throw an exception'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| animation.effect.updateTiming({ iterations: Infinity }); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| |
| animation.currentTime = -2000; |
| |
| try { animation.reverse(); } catch(e) { } |
| |
| assert_equals(animation.playbackRate, 1, 'playbackRate is unchanged'); |
| |
| await animation.ready; |
| assert_equals(animation.playbackRate, 1, 'playbackRate remains unchanged'); |
| }, 'When reversing throws an exception, the playback rate remains unchanged'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| animation.effect.updateTiming({ iterations: Infinity }); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| |
| animation.currentTime = -2000; |
| animation.playbackRate = 0; |
| |
| try { |
| animation.reverse(); |
| } catch (e) { |
| assert_unreached(`Unexpected exception when calling reverse(): ${e}`); |
| } |
| }, 'Reversing animation when playbackRate = 0 and currentTime < 0 ' + |
| 'and the target effect end is positive infinity should NOT throw an ' + |
| 'exception'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| animation.effect.updateTiming({ iterations: Infinity }); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| |
| animation.playbackRate = -1; |
| animation.currentTime = -2000; |
| animation.reverse(); |
| |
| assert_times_equal(animation.currentTime, 0, |
| 'reverse() should start playing from the start of animation time ' + |
| 'if the playbackRate < 0 and the currentTime < 0 ' + |
| 'and the target effect is positive infinity'); |
| }, 'Reversing an animation when playbackRate < 0 and currentTime < 0 ' + |
| 'and the target effect end is positive infinity should make it play ' + |
| 'from the start'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| animation.playbackRate = 0; |
| animation.currentTime = 500; |
| animation.reverse(); |
| |
| await animation.ready; |
| assert_equals(animation.playbackRate, 0, |
| 'reverse() should preserve playbackRate if the playbackRate == 0'); |
| assert_times_equal(animation.currentTime, 500, |
| 'reverse() should not affect the currentTime if the playbackRate == 0'); |
| }, 'Reversing when when playbackRate == 0 should preserve the current ' + |
| 'time and playback rate'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| assert_equals(animation.currentTime, null); |
| |
| animation.reverse(); |
| await animation.ready; |
| |
| assert_times_equal(animation.startTime, 1000, |
| 'animation.startTime should be at its effect end'); |
| assert_times_equal(animation.currentTime, 1000, |
| 'animation.currentTime should be at its effect end'); |
| }, 'Reversing an idle animation from starts playing the animation'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| const scroller = animation.timeline.scrollSource; |
| // Make the scroll timeline inactive. |
| scroller.style.overflow = 'visible'; |
| scroller.scrollTop; |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| |
| assert_throws_dom('InvalidStateError', () => { animation.reverse(); }); |
| }, 'Reversing an animation without an active timeline throws an ' + |
| 'InvalidStateError'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| animation.currentTime = 500; |
| animation.pause(); |
| |
| await animation.ready; |
| |
| animation.reverse(); |
| await animation.ready; |
| |
| assert_equals(animation.playState, 'running', |
| 'Animation.playState should be "running" after reverse()'); |
| }, 'Reversing an animation plays a pausing animation'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| await animation.ready; |
| |
| animation.updatePlaybackRate(2); |
| animation.reverse(); |
| |
| await animation.ready; |
| assert_equals(animation.playbackRate, -2); |
| }, 'Reversing should use the negative pending playback rate'); |
| |
| promise_test(async t => { |
| const animation = createScrollLinkedAnimation(t); |
| animation.effect.updateTiming({ iterations: Infinity }); |
| // Wait for new animation frame which allows the timeline to compute new |
| // current time. |
| await waitForNextFrame(); |
| animation.play(); |
| animation.currentTime = -200 * MS_PER_SEC; |
| await animation.ready; |
| |
| animation.updatePlaybackRate(2); |
| assert_throws_dom('InvalidStateError', () => { animation.reverse(); }); |
| assert_equals(animation.playbackRate, 1); |
| |
| await animation.ready; |
| assert_equals(animation.playbackRate, 2); |
| }, 'When reversing fails, it should restore any previous pending playback' |
| + ' rate'); |
| </script> |
| </body> |
