57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
// Like react-motion's Motion, but checks to see if the user prefers
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// reduced motion and uses a cross-fade in those cases.
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import React from 'react';
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import Motion from 'react-motion/lib/Motion';
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import PropTypes from 'prop-types';
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const stylesToKeep = ['opacity', 'backgroundOpacity'];
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let reduceMotion;
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const extractValue = (value) => {
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// This is either an object with a "val" property or it's a number
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return (typeof value === 'object' && value && 'val' in value) ? value.val : value;
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};
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class OptionalMotion extends React.Component {
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static propTypes = {
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defaultStyle: PropTypes.object,
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style: PropTypes.object,
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children: PropTypes.func,
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}
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render() {
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const { style, defaultStyle, children } = this.props;
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if (typeof reduceMotion !== 'boolean') {
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// This never changes without a page reload, so we can just grab it
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// once from the body classes as opposed to using Redux's connect(),
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// which would unnecessarily update every state change
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reduceMotion = document.body.classList.contains('reduce-motion');
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}
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if (reduceMotion) {
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Object.keys(style).forEach(key => {
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if (stylesToKeep.includes(key)) {
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return;
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}
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// If it's setting an x or height or scale or some other value, we need
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// to preserve the end-state value without actually animating it
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style[key] = defaultStyle[key] = extractValue(style[key]);
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});
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}
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return (
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<Motion style={style} defaultStyle={defaultStyle}>
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{children}
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</Motion>
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);
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}
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}
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export default OptionalMotion;
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