Samuel Newman
54 lines
1.7 KiB
TypeScript
54 lines
1.7 KiB
TypeScript
import {
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useCallback,
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useEffect,
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useRef,
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useState,
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useSyncExternalStore,
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} from 'react'
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import {isFirefox, isSafari} from '#/lib/browser'
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import {isWeb} from '#/platform/detection'
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function fullscreenSubscribe(onChange: () => void) {
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document.addEventListener('fullscreenchange', onChange)
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return () => document.removeEventListener('fullscreenchange', onChange)
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}
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export function useFullscreen(ref?: React.RefObject<HTMLElement | null>) {
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if (!isWeb) throw new Error("'useFullscreen' is a web-only hook")
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const isFullscreen = useSyncExternalStore(fullscreenSubscribe, () =>
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Boolean(document.fullscreenElement),
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)
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const scrollYRef = useRef<null | number>(null)
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const [prevIsFullscreen, setPrevIsFullscreen] = useState(isFullscreen)
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const toggleFullscreen = useCallback(() => {
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if (isFullscreen) {
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document.exitFullscreen()
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} else {
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if (!ref) throw new Error('No ref provided')
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if (!ref.current) return
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scrollYRef.current = window.scrollY
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ref.current.requestFullscreen()
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}
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}, [isFullscreen, ref])
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useEffect(() => {
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if (prevIsFullscreen === isFullscreen) return
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setPrevIsFullscreen(isFullscreen)
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// Chrome has an issue where it doesn't scroll back to the top after exiting fullscreen
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// Let's play it safe and do it if not FF or Safari, since anything else will probably be chromium
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if (prevIsFullscreen && !isFirefox && !isSafari) {
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setTimeout(() => {
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if (scrollYRef.current !== null) {
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window.scrollTo(0, scrollYRef.current)
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scrollYRef.current = null
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}
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}, 100)
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}
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}, [isFullscreen, prevIsFullscreen])
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return [isFullscreen, toggleFullscreen] as const
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}
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