Created
March 3, 2021 02:16
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import { RefObject, useMemo, useLayoutEffect, useRef, useState } from 'react' | |
type DOMRectRef = [rect: DOMRect, ref: RefObject<HTMLDivElement>] | |
export const useDimensions = ():DOMRectRef => { | |
const ref = useRef<HTMLDivElement>(null) | |
const [rect, setRect] = useState<DOMRect>(DOMRect.fromRect()) | |
const resizeObserver = useMemo(() => { | |
if ( !ref.current ) return | |
const observer = new ResizeObserver(entries => { | |
for (const entry of entries) { | |
setRect(entry.contentRect) | |
} | |
}) | |
observer.observe(ref.current) | |
return observer | |
}, [ref.current]) | |
useLayoutEffect(() => () => { | |
if (ref.current) { | |
resizeObserver?.unobserve(ref.current) | |
} | |
}, [resizeObserver, ref.current]) | |
return [rect, ref] | |
} |
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