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98 lines
3.3 KiB
HTML
98 lines
3.3 KiB
HTML
<!doctype html>
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<title>Visual Viewport Scroll Event Order</title>
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<meta charset=utf-8>
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<link rel="help" href="https://wicg.github.io/visual-viewport/index.html">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/resources/testdriver.js"></script>
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<script src="/resources/testdriver-actions.js"></script>
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<script src="/resources/testdriver-vendor.js"></script>
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<script src="viewport_support.js"></script>
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<style>
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#target {
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width: 100px;
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height: 100px;
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background-color: red;
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position: absolute;
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top: 300vh;
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}
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#scroller1,#scroller2 {
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width: 200px;
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height: 200px;
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overflow: auto;
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}
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#spacer {
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width: 80px;
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height: 1000px;
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background-image: linear-gradient(45deg, #808080 25%, transparent 25%),
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linear-gradient(-45deg, #808080 25%, transparent 25%),
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linear-gradient(45deg, transparent 75%, #808080 75%),
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linear-gradient(-45deg, transparent 75%, #808080 75%);
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background-size: 40px 40px;
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background-position: 0 0, 0 20px, 20px -20px, -20px 0px;
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}
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</style>
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<body>
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<div id="target"></div>
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<div id="scroller1"><div id="spacer"></div></div>
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<div id="scroller2"><div id="spacer"></div></div>
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</body>
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<script>
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async function oneRaf() {
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return new Promise((resolve) => {
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window.requestAnimationFrame(resolve);
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});
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}
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const scroller1 = document.getElementById('scroller1');
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const scroller2 = document.getElementById('scroller2');
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promise_test(async t => {
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// Pinch-zoom in so that the scrollIntoView call below causes scrolling in
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// both the layout and visual viewports within the same rAF.
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await pinchZoomIn();
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assert_greater_than(window.visualViewport.scale, 1, 'Must have zoomed in');
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await oneRaf();
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const scroll_events = [];
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// Register the scroll handlers on the window, visualViewport, and both
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// <div> scrollers.
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{
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window.onscroll = () => { scroll_events.push('window-attribute'); }
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window.addEventListener('scroll', () => { scroll_events.push('window-addEventListener'); });
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window.visualViewport.onscroll = () => { scroll_events.push('visualViewport-attribute'); }
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window.visualViewport.addEventListener('scroll', () => {
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scroll_events.push('visualViewport-addEventListener'); });
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scroller1.addEventListener('scroll',
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() => { scroll_events.push('scroller1'); });
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scroller2.addEventListener('scroll',
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() => { scroll_events.push('scroller2'); });
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}
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// Cause scrolling in each scroller and scrollIntoView so that the layout
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// and visual viewports both scroll.
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scroller1.scrollTop = 200;
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document.getElementById('target').scrollIntoView();
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scroller2.scrollTop = 200;
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// Wait a rAF since scroll events are delievered as part of the event loop.
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await oneRaf();
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// The scroll events must be delivered in the order they were executed,
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// scroller1 first, then the viewport (window then visualViewport), then
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// scroller2.
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assert_equals(scroll_events.toString(),
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'scroller1,' +
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'window-attribute,window-addEventListener,' +
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'visualViewport-attribute,visualViewport-addEventListener,' +
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'scroller2');
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}, "Scroll event ordering");
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</script>
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