89 lines
3.0 KiB
TypeScript
89 lines
3.0 KiB
TypeScript
import { KeyboardKey } from '@/Services/IOService'
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import { FOCUSABLE_BUT_NOT_TABBABLE } from '@/Constants'
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import { useCallback, useState, useEffect, RefObject } from 'react'
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export const useListKeyboardNavigation = (container: RefObject<HTMLElement | null>, initialFocus = 0) => {
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const [listItems, setListItems] = useState<HTMLButtonElement[]>()
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const [focusedItemIndex, setFocusedItemIndex] = useState<number>(initialFocus)
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const focusItemWithIndex = useCallback(
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(index: number, items?: HTMLButtonElement[]) => {
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setFocusedItemIndex(index)
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if (items && items.length > 0) {
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items[index]?.focus()
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} else {
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listItems?.[index]?.focus()
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}
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},
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[listItems],
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)
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useEffect(() => {
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if (container.current) {
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container.current.tabIndex = FOCUSABLE_BUT_NOT_TABBABLE
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setListItems(Array.from(container.current.querySelectorAll('button')))
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}
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}, [container])
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const keyDownHandler = useCallback(
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(e: KeyboardEvent) => {
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if (e.key === KeyboardKey.Up || e.key === KeyboardKey.Down) {
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e.preventDefault()
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} else {
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return
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}
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if (!listItems?.length) {
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setListItems(Array.from(container.current?.querySelectorAll('button') as NodeListOf<HTMLButtonElement>))
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}
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if (listItems) {
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if (e.key === KeyboardKey.Up) {
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let previousIndex = focusedItemIndex - 1
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if (previousIndex < 0) {
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previousIndex = listItems.length - 1
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}
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focusItemWithIndex(previousIndex)
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}
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if (e.key === KeyboardKey.Down) {
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let nextIndex = focusedItemIndex + 1
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if (nextIndex > listItems.length - 1) {
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nextIndex = 0
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}
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focusItemWithIndex(nextIndex)
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}
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}
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},
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[container, focusItemWithIndex, focusedItemIndex, listItems],
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)
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const FIRST_ITEM_FOCUS_TIMEOUT = 20
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const containerFocusHandler = useCallback(() => {
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let temporaryItems = listItems && listItems?.length > 0 ? listItems : []
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if (!temporaryItems.length) {
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temporaryItems = Array.from(container.current?.querySelectorAll('button') as NodeListOf<HTMLButtonElement>)
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setListItems(temporaryItems)
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}
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if (temporaryItems.length > 0) {
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const selectedItemIndex = Array.from(temporaryItems).findIndex((item) => item.dataset.selected)
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const indexToFocus = selectedItemIndex > -1 ? selectedItemIndex : initialFocus
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setTimeout(() => {
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focusItemWithIndex(indexToFocus, temporaryItems)
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}, FIRST_ITEM_FOCUS_TIMEOUT)
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}
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}, [container, focusItemWithIndex, initialFocus, listItems])
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useEffect(() => {
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const containerElement = container.current
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containerElement?.addEventListener('focus', containerFocusHandler)
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containerElement?.addEventListener('keydown', keyDownHandler)
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return () => {
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containerElement?.removeEventListener('focus', containerFocusHandler)
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containerElement?.removeEventListener('keydown', keyDownHandler)
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}
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}, [container, containerFocusHandler, keyDownHandler])
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}
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