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4.html
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<!DOCTYPE html>
<link rel="stylesheet" href="styles.css" />
<link rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/default.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
<style>
layout { display: layout(child); }
child { background-color: var(--color); width: 70px; }
</style>
<div id="controls">
<label>B : --inline-size <input type="number" data-unit="" value="100" step="10" /></label>
<label>B : --block-size <input type="number" data-unit="" value="100" step="10" /></label>
</div>
<pre><button>hide</button><code class="js">
registerLayout('child', class {
static get inputProperties() { return [''] }
static get childInputProperties() { return ['--inline-size', '--block-size'] }
*intrinsicSizes() { /* not yet implemented */ }
*layout(children, _, constraints, ___) {
const [child] = children;
let fixedInlineSize = parseInt(child.styleMap.get('--inline-size'));
let fixedBlockSize = parseInt(child.styleMap.get('--block-size'));
if (fixedInlineSize < 0) fixedInlineSize = undefined;
if (fixedBlockSize < 0) fixedBlockSize = undefined;
const fragment = yield child.layoutNextFragment({
fixedInlineSize, fixedBlockSize
});
fragment.inlineOffset =
(constraints.fixedInlineSize - fragment.inlineSize) / 2;
fragment.blockOffset = 20;
const autoBlockSize = fragment.blockOffset + fragment.blockSize;
return {autoBlockSize, childFragments: [fragment]};
}
});
</code></pre>
<pre><code class="html"></code></pre>
<div id="wrapper">
<layout id="A">
<child id="B">B</child>
</layout>
</div>
<script src="script.js"></script>