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useRect — getBoundingClientRect() React Hook with resize handler
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| import { useLayoutEffect, useCallback, useState } from 'react' | |
| export const useRect = (ref) => { | |
| const [rect, setRect] = useState(getRect(ref ? ref.current : null)) | |
| const handleResize = useCallback(() => { | |
| if (!ref.current) { | |
| return | |
| } | |
| // Update client rect | |
| setRect(getRect(ref.current)) | |
| }, [ref]) | |
| useLayoutEffect(() => { | |
| const element = ref.current | |
| if (!element) { | |
| return | |
| } | |
| handleResize() | |
| if (typeof ResizeObserver === 'function') { | |
| let resizeObserver = new ResizeObserver(() => handleResize()) | |
| resizeObserver.observe(element) | |
| return () => { | |
| if (!resizeObserver) { | |
| return | |
| } | |
| resizeObserver.disconnect() | |
| resizeObserver = null | |
| } | |
| } else { | |
| // Browser support, remove freely | |
| window.addEventListener('resize', handleResize) | |
| return () => { | |
| window.removeEventListener('resize', handleResize) | |
| } | |
| } | |
| }, [ref.current]) | |
| return rect | |
| } | |
| function getRect(element) { | |
| if (!element) { | |
| return { | |
| bottom: 0, | |
| height: 0, | |
| left: 0, | |
| right: 0, | |
| top: 0, | |
| width: 0, | |
| } | |
| } | |
| return element.getBoundingClientRect() | |
| } |
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