Created
June 20, 2019 14:45
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import { useMemo, useEffect, MutableRefObject } from 'react'; | |
export default function useResizeObserver( | |
targetNode: MutableRefObject<any>, | |
callback: (rect: DOMRect) => void, | |
) { | |
const observer = useMemo( | |
() => | |
// Note: ResizeObserver comes back as unfound even | |
// this it's available, so for now I'm just going to | |
// ignore the error | |
// @ts-ignore | |
new ResizeObserver((entries) => { | |
for (const entry of entries) { | |
callback(entry.contentRect); | |
} | |
}), | |
[callback] | |
); | |
useEffect( | |
() => { | |
if (targetNode.current) { | |
observer.observe(targetNode.current); | |
return () => { | |
observer.disconnect(); | |
}; | |
} | |
return; | |
}, | |
[targetNode.current] | |
); | |
} | |
// We need to push the list down based on the current size of | |
// the banner, which can change because the window is resizable | |
const resizeCallback = React.useCallback((rect) => { | |
if (listRef.current) { | |
listRef.current.style.transform = `translateY(${rect.height + OFFSET}px)`; | |
} | |
}, [listRef]); | |
React.useEffect(() => { | |
return () => { | |
// Reset the FileList bump when the banner is unmounted | |
listRef.current.style.transform = `translateY(0px)`; | |
}; | |
}, []); |
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