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import { useEffect, useRef } from 'react'; |
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|
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export const ScrollIntoViewOnce = ({ children, ...props }) => { |
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const ref = useRef(null); |
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const once = useRef(false); |
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|
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useEffect(() => { |
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if (!ref.current || once.current) return; |
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const c = ref.current; |
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// only scroll if 50% isnt visible |
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const rect = c.getBoundingClientRect(); |
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const windowHeight = |
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window.innerHeight || document.documentElement.clientHeight; |
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const elementHeight = rect.height; |
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const visibleTop = Math.max(rect.top, 0); |
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const visibleBottom = Math.min(rect.bottom, windowHeight); |
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const visibleHeight = Math.max(0, visibleBottom - visibleTop); |
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const visibleRatio = visibleHeight / elementHeight; |
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|
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if (visibleRatio >= 0.5) return; |
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c.scrollIntoView({ behavior: 'smooth', block: 'end' }); |
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once.current = true; |
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}, []); |
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|
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return ( |
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<div ref={ref} {...props}> |
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{children} |
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</div> |
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); |
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}; |
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