49 lines
1.2 KiB
TypeScript
49 lines
1.2 KiB
TypeScript
import { useEffect, useRef, type ReactNode } from 'react'
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type RevealProps = {
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children: ReactNode
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className?: string
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/** Custom animation class applied when in view, e.g. anim-slide-left */
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variant?: string
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delayMs?: number
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}
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export function Reveal({ children, className = '', variant = 'anim-rise', delayMs = 0 }: RevealProps) {
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const ref = useRef<HTMLDivElement>(null)
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useEffect(() => {
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const node = ref.current
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if (!node) return
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if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) {
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node.classList.add('is-in')
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return
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}
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const observer = new IntersectionObserver(
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(entries) => {
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entries.forEach((entry) => {
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if (entry.isIntersecting) {
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node.classList.add('is-in')
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observer.unobserve(node)
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}
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})
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},
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{ threshold: 0.16, rootMargin: '0px 0px -6% 0px' },
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)
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observer.observe(node)
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return () => observer.disconnect()
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}, [])
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return (
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<div
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ref={ref}
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className={`reveal-base ${variant} ${className}`.trim()}
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style={delayMs ? { transitionDelay: `${delayMs}ms` } : undefined}
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>
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{children}
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</div>
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)
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}
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