Created
November 2, 2022 13:18
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React hook to listen to element size changes
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| import { useEffect, useMemo, useRef, useState } from 'react'; | |
| type ObserverRect = Omit<DOMRectReadOnly, 'toJSON'>; | |
| const defaultState: ObserverRect = { | |
| x: 0, | |
| y: 0, | |
| width: 0, | |
| height: 0, | |
| top: 0, | |
| left: 0, | |
| bottom: 0, | |
| right: 0, | |
| }; | |
| // eslint-disable-next-line @typescript-eslint/no-explicit-any | |
| export function useResizeObserver<T extends HTMLElement = any>() { | |
| const frameID = useRef(0); | |
| const ref = useRef<T>(null); | |
| const [rect, setRect] = useState<ObserverRect>(defaultState); | |
| const observer = useMemo( | |
| () => | |
| typeof window !== 'undefined' | |
| ? new ResizeObserver((entries: ResizeObserverEntry[]) => { | |
| const entry = entries[0]; | |
| if (entry) { | |
| cancelAnimationFrame(frameID.current); | |
| frameID.current = requestAnimationFrame(() => { | |
| if (ref.current) { | |
| setRect(entry.contentRect); | |
| } | |
| }); | |
| } | |
| }) | |
| : null, | |
| [], | |
| ); | |
| useEffect(() => { | |
| if (ref.current) { | |
| observer?.observe(ref.current); | |
| } | |
| return () => { | |
| observer?.disconnect(); | |
| if (frameID.current) { | |
| cancelAnimationFrame(frameID.current); | |
| } | |
| }; | |
| // eslint-disable-next-line react-hooks/exhaustive-deps | |
| }, [ref.current]); | |
| return [ref, rect] as const; | |
| } | |
| // eslint-disable-next-line @typescript-eslint/no-explicit-any | |
| export function useElementSize<T extends HTMLElement = any>() { | |
| const [ref, { width, height }] = useResizeObserver<T>(); | |
| return { ref, width, height }; | |
| } |
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