Created
January 27, 2021 23:29
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useResizeObserver.js
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| import { useEffect } from "react"; | |
| let nodeList = new Map(); | |
| let observer = new window.ResizeObserver((entries) => { | |
| for (const entry of entries) { | |
| if (nodeList.has(entry.target)) { | |
| nodeList.get(entry.target)(entry); | |
| } | |
| } | |
| }); | |
| export default function useResizeObserver(node, cb) { | |
| useEffect(() => { | |
| if (node && cb) { | |
| if (nodeList.has(node)) { | |
| console.warn("Warning: ResizeObserver is already observing node..."); | |
| console.warn(node); | |
| } else { | |
| observer.observe(node); | |
| nodeList.set(node, cb); | |
| } | |
| } | |
| return function() { | |
| if (node) nodeList.delete(node); | |
| if (node && observer) observer.unobserve(node); | |
| }; | |
| }, [node]); | |
| } |
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