website/src/client/ComboBox.tsx

import { type ComponentChildren } from 'preact'
import { useState, useRef, useEffect } from 'preact/hooks'
import { clsx, isMobile } from './lib/util'
import { PhosphorIcon } from './Icon'

export const ComboBox = ({
    value,
    setValue,
    children,
}: {
    value: string
    setValue: (s: string) => void
    children: Record<string, ComponentChildren>
}) => {
    const [cloak, setCloak] = useState(true)
    const [open, setOpen] = useState(true)
    const comboRef = useRef<HTMLDivElement>(null)

    useEffect(() => {
        const handleClick = (e: MouseEvent) => {
            if (comboRef.current && !comboRef.current.contains(e.target as Node)) {
                setOpen(false)
            }
        }
        document.addEventListener('mousedown', handleClick)
        return () => document.removeEventListener('mousedown', handleClick)
    }, [])

    const [itemWidth, setItemWidth] = useState<number>(200)

    useEffect(() => {
        setOpen(false)
        setCloak(false)
    }, [])

    return (
        <div
            class="combobox"
            ref={comboRef}
            style={{ width: isMobile() ? undefined : itemWidth + 48 + 'px' }}
        >
            <div class="selected" onClick={() => setOpen(!open)}>
                <div class="content">{children[value]}</div>
                {/* <span class="material-symbols-outlined">expand_more</span> */}
                <PhosphorIcon name="caret-down" />
            </div>
            {open && (
                <div
                    class={clsx('dropdown', cloak && 'invisible')}
                    ref={el => el && setItemWidth(el.offsetWidth)}
                >
                    {Object.keys(children).map(key => (
                        <div
                            class="option"
                            onClick={() => {
                                setValue(key)
                                setOpen(false)
                            }}
                        >
                            {children[key]}
                        </div>
                    ))}
                </div>
            )}
        </div>
    )
}