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perf: custom useMeasure hook, filter falsy children
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| import { MutableRefObject, useEffect, useRef, useState } from "react"; | ||
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| const useMeasure = () => { | ||
| const observer = useRef<ResizeObserver | null>(null); | ||
| const measureRef: MutableRefObject<HTMLElement | null> = | ||
| useRef<HTMLElement | null>(null); | ||
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| const setRef = (element: HTMLElement | null) => { | ||
| measureRef.current = element; | ||
| }; | ||
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| const [width, setWidth] = useState<number | null>(null); | ||
| const [height, setHeight] = useState<number | null>(null); | ||
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| const onResize = ([entry]: ResizeObserverEntry[]) => { | ||
| if (!entry) return; | ||
| if (entry.contentRect.width !== width) setWidth(entry.contentRect.width); | ||
| if (entry.contentRect.height !== height) | ||
| setHeight(entry.contentRect.height); | ||
| }; | ||
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| useEffect(() => { | ||
| if (observer && observer.current && measureRef.current) { | ||
| observer.current.unobserve(measureRef.current); | ||
| } | ||
| observer.current = new ResizeObserver(onResize); | ||
| observe(); | ||
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| return () => { | ||
| if (observer.current && measureRef.current) { | ||
| observer.current.unobserve(measureRef.current); | ||
| } | ||
| }; | ||
| }, [measureRef.current]); | ||
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| const observe = () => { | ||
| if (measureRef.current && observer.current) { | ||
| observer.current.observe(measureRef.current); | ||
| } | ||
| }; | ||
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| return [setRef, { width, height }] as const; | ||
| }; | ||
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| export default useMeasure; |