// Like react-motion's Motion, but reduces all animations to cross-fades // for the benefit of users with motion sickness. import PropTypes from 'prop-types'; import { Component } from 'react'; import Motion from 'react-motion/lib/Motion'; const stylesToKeep = ['opacity', 'backgroundOpacity']; const extractValue = (value) => { // This is either an object with a "val" property or it's a number return (typeof value === 'object' && value && 'val' in value) ? value.val : value; }; class ReducedMotion extends Component { static propTypes = { defaultStyle: PropTypes.object, style: PropTypes.object, children: PropTypes.func, }; render() { const { style, defaultStyle, children } = this.props; Object.keys(style).forEach(key => { if (stylesToKeep.includes(key)) { return; } // If it's setting an x or height or scale or some other value, we need // to preserve the end-state value without actually animating it style[key] = defaultStyle[key] = extractValue(style[key]); }); return ( <Motion style={style} defaultStyle={defaultStyle}> {children} </Motion> ); } } export default ReducedMotion;