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https://github.com/RGBCube/serenity
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fcf293a8df
Extends event loop processing steps to include gathering and broadcasting resize observations. Moves layout updates from Navigable::paint() to event loop processing steps. This ensures resize observation processing occurs between layout updates and painting.
52 lines
1.3 KiB
HTML
52 lines
1.3 KiB
HTML
<!DOCTYPE html>
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<head>
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<style>
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#box {
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width: 200px;
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height: 200px;
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background-color: lightblue;
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}
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</style>
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</head>
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<body>
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<div id="box"></div>
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</body>
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<script src="../include.js"></script>
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<script>
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asyncTest(async done => {
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const box = document.getElementById("box");
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let resolve = null;
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function createResizeObserverPromise() {
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return new Promise(r => {
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resolve = r;
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});
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}
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const resizeObserver = new ResizeObserver(entries => {
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for (let entry of entries) {
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const { width, height } = entry.contentRect;
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println(`Size changed: ${width}px x ${height}px`);
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}
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if (resolve) resolve();
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});
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let observerCallbackInvocation = createResizeObserverPromise();
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resizeObserver.observe(box);
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await observerCallbackInvocation;
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// Change size of box multiple times.
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// Observer callback is expected to be invoked only once.
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box.style.width = "300px";
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box.style.height = "300px";
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box.style.width = "400px";
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box.style.height = "400px";
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observerCallbackInvocation = createResizeObserverPromise();
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await observerCallbackInvocation;
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done();
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});
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</script>
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