25 lines
794 B
TypeScript
25 lines
794 B
TypeScript
import { StateUpdater, useCallback, useState } from 'preact/hooks'
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/**
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* @returns a callback that will close a dropdown if none of its children has
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* focus. Use the returned function as the onBlur callback of children that need to be
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* monitored.
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*/
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export function useCloseOnBlur(
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container: { current?: HTMLDivElement | null },
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setOpen: (open: boolean) => void,
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): [(event: { relatedTarget: EventTarget | null }) => void, StateUpdater<boolean>] {
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const [locked, setLocked] = useState(false)
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return [
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useCallback(
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function onBlur(event: { relatedTarget: EventTarget | null }) {
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if (!locked && !container.current?.contains(event.relatedTarget as Node)) {
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setOpen(false)
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}
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},
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[container, setOpen, locked],
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),
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setLocked,
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]
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}
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