2023-05-25 10:13:56 +00:00
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import { useState, useRef, useEffect, useCallback } from "react";
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2023-05-25 04:42:30 +00:00
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const focusUrlParamName = 'focus'
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const focusChangedEventName = "focus-changed"
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const focusedElementClassName = 'focused-element'
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2023-05-25 09:44:35 +00:00
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function triggerElementFocused(elementKey?: string) {
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2023-05-25 04:42:30 +00:00
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const url = new URL(window.location.href);
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2023-05-25 09:44:35 +00:00
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if (elementKey) {
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url.searchParams.set(focusUrlParamName, elementKey)
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} else {
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url.searchParams.delete(focusUrlParamName)
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}
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const focusChangeEvent = new Event(focusChangedEventName)
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2023-05-25 04:42:30 +00:00
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history.pushState({}, "", url);
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window.dispatchEvent(focusChangeEvent)
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}
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2023-05-25 10:13:56 +00:00
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export function useFocusedElement<ElementType extends HTMLElement>(elementKey: string) {
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2023-05-25 09:44:35 +00:00
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const [isFocusedElement, setFocusedElement] = useState(false)
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2023-05-25 04:42:30 +00:00
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const focusedClass = isFocusedElement ? focusedElementClassName : ''
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2023-05-25 10:13:56 +00:00
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const elementRef = useRef<ElementType>(null)
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2023-05-25 04:42:30 +00:00
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2023-05-25 10:13:56 +00:00
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const focusElement = useCallback(() => {
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2023-05-25 09:44:35 +00:00
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triggerElementFocused(isFocusedElement ? undefined : elementKey)
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2023-05-25 10:13:56 +00:00
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}, [isFocusedElement, elementKey])
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2023-05-25 09:44:35 +00:00
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2023-05-25 04:42:30 +00:00
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useEffect(() => {
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2023-05-25 10:13:56 +00:00
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function updateFocusedState() {
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2023-05-25 04:42:30 +00:00
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const params = new URLSearchParams(window.location.search)
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const focusedElement = params.get(focusUrlParamName)
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const focused: boolean = focusedElement && focusedElement == elementKey || false
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setFocusedElement(focused)
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}
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2023-05-25 10:13:56 +00:00
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updateFocusedState()
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addEventListener(focusChangedEventName, updateFocusedState)
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2023-05-25 04:42:30 +00:00
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return () => {
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2023-05-25 10:13:56 +00:00
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removeEventListener(focusChangedEventName, updateFocusedState)
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2023-05-25 04:42:30 +00:00
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}
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2023-05-25 10:13:56 +00:00
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}, [elementKey, setFocusedElement, focusElement])
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2023-05-25 04:42:30 +00:00
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isFocusedElement && elementRef.current?.scrollIntoView()
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return {isFocusedElement, focusedClass, elementRef, focusElement}
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}
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2023-05-25 10:13:56 +00:00
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export function useAutoFocus<ElementType extends HTMLElement>(elementKey: string) {
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const {elementRef, focusedClass, focusElement} = useFocusedElement<ElementType>(elementKey);
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useEffect(() => {
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let cleanup = () => {}
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if (elementRef.current) {
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const elem = elementRef.current
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2023-05-25 13:29:51 +00:00
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elem.onclick = (evt) => {
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evt.stopPropagation()
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focusElement()
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}
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2023-05-25 10:13:56 +00:00
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const classNameBackup = elem.className
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elem.className += ' ' + focusedClass
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cleanup = () => {
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elem.className = classNameBackup
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}
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}
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return cleanup
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}, [elementRef, focusedClass, focusElement])
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return elementRef
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}
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