Created
September 5, 2019 08:02
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| import { useState, useEffect, RefObject } from 'react'; | |
| import ResizeObserver from 'resize-observer-polyfill'; | |
| export interface IDOMRectReadOnly { | |
| readonly width: number; | |
| readonly height: number; | |
| readonly top: number; | |
| readonly left: number; | |
| readonly right: number; | |
| readonly bottom: number; | |
| } | |
| export function useMeasure<T extends HTMLElement>(ref: RefObject<T>) { | |
| const [bounds, set] = useState({ | |
| width: 0, | |
| height: 0, | |
| left: 0, | |
| top: 0, | |
| right: 0, | |
| bottom: 0, | |
| }); | |
| const [resizeObserver] = useState( | |
| () => new ResizeObserver(([entry]) => set(entry.contentRect)), | |
| ); | |
| useEffect(() => { | |
| if (ref.current) { | |
| resizeObserver.observe(ref.current!); | |
| } | |
| return () => resizeObserver.disconnect(); | |
| }, [ref]); | |
| return bounds; | |
| } |
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