overleaf/services/web/frontend/js/shared/hooks/use-dropdown.js

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import { useCallback, useEffect, useRef, useState } from 'react'
import { findDOMNode } from 'react-dom'
export default function useDropdown(defaultOpen = false) {
const [open, setOpen] = useState(defaultOpen)
// store the dropdown node for use in the "click outside" event listener
const ref = useRef(null)
// react-bootstrap v0.x passes `component` instead of `node` to the ref callback
const handleRef = useCallback(
component => {
if (component) {
// eslint-disable-next-line react/no-find-dom-node
ref.current = findDOMNode(component)
}
},
[ref]
)
// prevent a click on the dropdown toggle propagating to the original handler
const handleClick = useCallback(event => {
event.stopPropagation()
}, [])
// handle dropdown toggle
const handleToggle = useCallback(value => {
setOpen(value)
}, [])
// close the dropdown on click outside the dropdown
const handleDocumentClick = useCallback(
event => {
if (ref.current && !ref.current.contains(event.target)) {
setOpen(false)
}
},
[ref]
)
// add/remove listener for click anywhere in document
useEffect(() => {
if (open) {
document.addEventListener('mousedown', handleDocumentClick)
}
return () => {
document.removeEventListener('mousedown', handleDocumentClick)
}
}, [open, handleDocumentClick])
// return props for the Dropdown component
return { ref: handleRef, onClick: handleClick, onToggle: handleToggle, open }
}