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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.
57 lines
1.8 KiB
HTML
57 lines
1.8 KiB
HTML
<!DOCTYPE html>
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<head>
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<style>
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#box {
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width: 100px;
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height: 200px;
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background-color: lightblue;
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border: 10px solid pink;
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padding: 10px;
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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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const borderBoxSize = entry.borderBoxSize[0];
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const contentBoxSize = entry.contentBoxSize[0];
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const deviceBoxSize = entry.devicePixelContentBoxSize[0];
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let string = `contentSize: ${width}px x ${height}px`;
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string += `; borderBoxSize [inline=${borderBoxSize.inlineSize}px, block=${borderBoxSize.blockSize}px]`;
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string += `; contentBoxSize [inline=${contentBoxSize.inlineSize}px, block=${contentBoxSize.blockSize}px]`;
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string += `; deviceBoxSize [inline=${deviceBoxSize.inlineSize}px, block=${deviceBoxSize.blockSize}px]`;
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println(string);
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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, { box: "border-box" });
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await observerCallbackInvocation;
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box.style.borderTopWidth = "50px";
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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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