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import { useCallback, useEffect, useRef, useState } from 'react' |
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interface HorizontalScrollOverflow { |
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atStart: boolean |
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atEnd: boolean |
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scrollRef: React.RefObject<HTMLElement> |
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} |
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|
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const EDGE_TOLERANCE = 1 |
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|
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export const useHorizontalScrollOverflow = (): HorizontalScrollOverflow => { |
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const scrollRef = useRef<HTMLElement>(null) |
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const [position, setPosition] = useState({ atStart: true, atEnd: true }) |
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|
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const updatePosition = useCallback(() => { |
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const element = scrollRef.current |
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|
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if (!element) { |
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return |
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} |
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|
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const hasOverflow = element.scrollWidth - element.clientWidth > EDGE_TOLERANCE |
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const atStart = !hasOverflow || element.scrollLeft <= EDGE_TOLERANCE |
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const atEnd = !hasOverflow || element.scrollLeft + element.clientWidth >= element.scrollWidth - EDGE_TOLERANCE |
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|
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setPosition(previous => previous.atStart === atStart && previous.atEnd === atEnd |
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? previous |
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: { atStart, atEnd }) |
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}, []) |
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|
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useEffect(() => { |
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const element = scrollRef.current |
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|
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if (!element) { |
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return |
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} |
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updatePosition() |
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element.addEventListener('scroll', updatePosition, { passive: true }) |
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const observer = new ResizeObserver(updatePosition) |
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observer.observe(element) |
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observer.observe(element.firstElementChild ?? element) |
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|
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return () => { |
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element.removeEventListener('scroll', updatePosition) |
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observer.disconnect() |
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} |
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}, [updatePosition]) |
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|
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return { ...position, scrollRef } |
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} |
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