66 lines
2.5 KiB
HTML
66 lines
2.5 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width; initial-scale=1.0">
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<title>Dragging the mouse on a scrollbar for a transformed, filtered scrollframe</title>
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<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
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<script type="application/javascript" src="apz_test_utils.js"></script>
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<script src="/tests/SimpleTest/paint_listener.js"></script>
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<script type="text/javascript">
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async function test() {
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var scrollableDiv = document.getElementById("scrollable");
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let scrollPromise = new Promise(resolve => {
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scrollableDiv.addEventListener("scroll", resolve, {once: true});
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});
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// Scroll down a small amount (10px). The bug in this case is that the
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// scrollthumb "jumps" most of the way down the scroll track because with
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// WR enabled the filter and transform display items combine to generate an
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// incorrect APZC tree, and the mouse position gets untransformed incorrectly.
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// Given the scrollable height of 2000px and scrollframe height of 400px,
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// the scrollthumb should be approximately 80px tall, and dragging it 10px
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// should scroll approximately 50 pixels. If the bug manifests, it will get
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// dragged an extra ~150px and scroll to approximately 1250px.
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var dragFinisher = await promiseVerticalScrollbarDrag(scrollableDiv, 10, 10);
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if (!dragFinisher) {
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ok(true, "No scrollbar, can't do this test");
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return;
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}
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// the events above might be stuck in APZ input queue for a bit until the
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// layer is activated, so we wait here until the scroll event listener is
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// triggered.
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await scrollPromise;
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await dragFinisher();
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// Flush everything just to be safe
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await promiseOnlyApzControllerFlushed();
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// In this case we just want to make sure the scroll position moved from 0
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// which indicates the thumb dragging worked properly.
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ok(scrollableDiv.scrollTop < 100, "Scrollbar drag resulted in a scroll position of " + scrollableDiv.scrollTop);
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}
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waitUntilApzStable()
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.then(test)
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.then(subtestDone, subtestFailed);
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</script>
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</head>
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<body>
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<div style="position: fixed; left: 100px; top: 100px; width: 400px; height: 600px">
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<div style="transform: translateY(150px); will-change: transform">
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<div style="filter: grayscale(80%)">
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<div id="scrollable" style="height: 400px; overflow-y: auto">
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<div style="min-height: 2000px">
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yay text
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</div>
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</div>
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</div>
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</div>
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</div>
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</body>
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</html>
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