| import { useState } from 'react' | |
| import { assign } from '../globals' | |
| import { useIsomorphicLayoutEffect } from './useIsomorphicLayoutEffect' | |
| /** | |
| * Returns `boolean` or `null`, used to automatically | |
| * set skipAnimations to the value of the user's | |
| * `prefers-reduced-motion` query. | |
| * | |
| * The return value, post-effect, is the value of their prefered setting | |
| */ | |
| export const useReducedMotion = () => { | |
| const [reducedMotion, setReducedMotion] = useState<boolean | null>(null) | |
| useIsomorphicLayoutEffect(() => { | |
| const mql = window.matchMedia('(prefers-reduced-motion)') | |
| const handleMediaChange = (e: MediaQueryListEvent | MediaQueryList) => { | |
| setReducedMotion(e.matches) | |
| assign({ | |
| skipAnimation: e.matches, | |
| }) | |
| } | |
| handleMediaChange(mql) | |
| if (mql.addEventListener) { | |
| mql.addEventListener('change', handleMediaChange) | |
| } else { | |
| mql.addListener(handleMediaChange) | |
| } | |
| return () => { | |
| if (mql.removeEventListener) { | |
| mql.removeEventListener('change', handleMediaChange) | |
| } else { | |
| mql.removeListener(handleMediaChange) | |
| } | |
| } | |
| }, []) | |
| return reducedMotion | |
| } | |