framer-motion
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A simple and powerful JavaScript animation library
48 lines (45 loc) • 1.61 kB
JavaScript
import { warnOnce } from 'motion-utils';
import { useState } from 'react';
import { initPrefersReducedMotion } from './index.mjs';
import { hasReducedMotionListener, prefersReducedMotion } from './state.mjs';
/**
* A hook that returns `true` if we should be using reduced motion based on the current device's Reduced Motion setting.
*
* This can be used to implement changes to your UI based on Reduced Motion. For instance, replacing motion-sickness inducing
* `x`/`y` animations with `opacity`, disabling the autoplay of background videos, or turning off parallax motion.
*
* It will actively respond to changes and re-render your components with the latest setting.
*
* ```jsx
* export function Sidebar({ isOpen }) {
* const shouldReduceMotion = useReducedMotion()
* const closedX = shouldReduceMotion ? 0 : "-100%"
*
* return (
* <motion.div animate={{
* opacity: isOpen ? 1 : 0,
* x: isOpen ? 0 : closedX
* }} />
* )
* }
* ```
*
* @return boolean
*
* @public
*/
function useReducedMotion() {
/**
* Lazy initialisation of prefersReducedMotion
*/
!hasReducedMotionListener.current && initPrefersReducedMotion();
const [shouldReduceMotion] = useState(prefersReducedMotion.current);
if (process.env.NODE_ENV !== "production") {
warnOnce(shouldReduceMotion !== true, "You have Reduced Motion enabled on your device. Animations may not appear as expected.");
}
/**
* TODO See if people miss automatically updating shouldReduceMotion setting
*/
return shouldReduceMotion;
}
export { useReducedMotion };