63 lines
1.4 KiB
JavaScript
63 lines
1.4 KiB
JavaScript
import React, { Component } from 'react';
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import scrollToElement from 'scroll-to-element';
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function slideDown(el) {
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const { style } = el;
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const INITIAL = 'initial';
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const HIDDEN = 'hidden';
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// Get element height
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style.transition = INITIAL;
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style.visibility = HIDDEN;
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style.maxHeight = INITIAL;
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const offsetHeight = el.offsetHeight;
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const height = offsetHeight + 'px';
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style.removeProperty('visibility');
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style.maxHeight = '0';
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style.overflow = HIDDEN;
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const timing = `${parseInt(height, 10) * 1.9}ms linear`;
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// Begin transition
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style.transition = `max-height ${timing}, opacity ${timing}`;
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requestAnimationFrame(() => {
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style.maxHeight = height;
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style.opacity = '1';
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});
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window.setTimeout(() => {
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style.removeProperty('overflow');
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style.removeProperty('max-height');
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}, 300);
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}
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const Animated = WrappedComponent =>
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class Animated extends Component {
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componentDidUpdate() {
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const { match, step } = this.props;
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if (match.params.step === step) {
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slideDown(this.wrapper);
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scrollToElement(this.wrapper, {
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offset: -50
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});
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}
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}
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shouldComponentUpdate = nextProps =>
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this.props.match.params.step !== nextProps.match.params.step;
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render() {
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return (
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<div
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ref={w => {
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this.wrapper = w;
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}}
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>
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<WrappedComponent {...this.props} />
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</div>
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);
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}
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};
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export default Animated;
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