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import { useState, useEffect } from 'react'
interface Options {
enterDelay?: number
exitDelay?: number
onUnmount?: () => void
}
type Timeout = ReturnType<typeof setTimeout>
/**
* Useful to perform CSS transitions on React components without
* using libraries like Framer Motion. This hook will defer the
* unmount of a React component until after a delay.
*
* @param active - Whether the component should be rendered
* @param options - Options for the delayed render
* @param options.enterDelay - Delay before rendering the component
* @param options.exitDelay - Delay before unmounting the component
*
* const Modal = ({ active }) => {
* const { mounted, rendered } = useDelayedRender(active, {
* exitDelay: 2000,
* })
*
* if (!mounted) return null
*
* return (
* <Portal>
* <div className={rendered ? 'modal visible' : 'modal'}>...</div>
* </Portal>
* )
*}
*
* */
export function useDelayedRender(active = false, options: Options = {}) {
const [mounted, setMounted] = useState(active)
const [rendered, setRendered] = useState(false)
const { enterDelay = 1, exitDelay = 0 } = options
useEffect(() => {
let renderTimeout: Timeout | undefined
let unmountTimeout: Timeout | undefined
if (active) {
setMounted(true)
if (enterDelay <= 0) {
setRendered(true)
} else {
renderTimeout = setTimeout(() => {
setRendered(true)
}, enterDelay)
}
} else {
setRendered(false)
if (exitDelay <= 0) {
setMounted(false)
} else {
unmountTimeout = setTimeout(() => {
setMounted(false)
}, exitDelay)
}
}
return () => {
clearTimeout(renderTimeout)
clearTimeout(unmountTimeout)
}
}, [active, enterDelay, exitDelay])
return { mounted, rendered }
}
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