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Code Issues Projects Releases Packages Wiki Activity Actions 10

LibWeb: Fix unnecessary wheel event consumption with overflow: scroll

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Allow wheel event to be consumed by a `overflow: scroll` box only if it
has content that overflows a scrollport.

This fixes the timing issue in the
`Text/input/scroll-window-using-wheel-event.html` test, where a `<body>`
element with `overflow: scroll` was incorrectly consuming wheel events
that should have propagated to the window.
This commit is contained in:
Aliaksandr Kalenik 2025-01-30 15:54:14 +01:00 • committed by Jelle Raaijmakers
commit a4c331c199
Notes: github-actions[bot] 2025-01-30 23:39:21 +00:00
3 changed files with 63 additions and 5 deletions
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51
Tests/LibWeb/Text/input/scroll-by-dispatching-wheel-event-on-overflow-scroll-without-scrollable-overflow.html Normal file
View file

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<!DOCTYPE html>
<html lang="en">
<script src="include.js"></script>
<head>
<style>
body {
margin: 0;
}
.scroll-container {
height: 300px;
width: 300px;
overflow: auto;
border: 2px solid #333;
background-color: #f0f0f0;
}
.box {
overflow: scroll;
}
.nested {
border: 2px solid #777;
background-color: white;
height: 100px;
}
</style>
</head>
<body>
<div class="scroll-container">
<div class="box"><div class="nested">Box 1</div></div>
<div class="box"><div class="nested">Box 2</div></div>
<div class="box"><div class="nested">Box 3</div></div>
<div class="box"><div class="nested">Box 4</div></div>
<div class="box"><div class="nested">Box 5</div></div>
<div class="box"><div class="nested">Box 6</div></div>
<div class="box"><div class="nested">Box 7</div></div>
<div class="box"><div class="nested">Box 8</div></div>
</div>
</body>
<script>
asyncTest(done => {
const container = document.querySelector(".scroll-container");
container.onscroll = () => {
println(`new scrollY: ${container.scrollTop}`);
done();
};
internals.wheel(50, 50, 0, 100);
});
</script>
</html>