65 lines
1.7 KiB
JavaScript
65 lines
1.7 KiB
JavaScript
import React from 'react';
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import PropTypes from 'prop-types';
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import { FormattedNumber } from 'react-intl';
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import TransitionMotion from 'react-motion/lib/TransitionMotion';
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import spring from 'react-motion/lib/spring';
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import { reduceMotion } from 'flavours/glitch/util/initial_state';
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export default class AnimatedNumber extends React.PureComponent {
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static propTypes = {
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value: PropTypes.number.isRequired,
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};
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state = {
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direction: 1,
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};
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componentWillReceiveProps (nextProps) {
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if (nextProps.value > this.props.value) {
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this.setState({ direction: 1 });
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} else if (nextProps.value < this.props.value) {
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this.setState({ direction: -1 });
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}
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}
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willEnter = () => {
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const { direction } = this.state;
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return { y: -1 * direction };
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}
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willLeave = () => {
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const { direction } = this.state;
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return { y: spring(1 * direction, { damping: 35, stiffness: 400 }) };
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}
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render () {
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const { value } = this.props;
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const { direction } = this.state;
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if (reduceMotion) {
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return <FormattedNumber value={value} />;
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}
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const styles = [{
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key: `${value}`,
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data: value,
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style: { y: spring(0, { damping: 35, stiffness: 400 }) },
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}];
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return (
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<TransitionMotion styles={styles} willEnter={this.willEnter} willLeave={this.willLeave}>
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{items => (
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<span className='animated-number'>
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{items.map(({ key, data, style }) => (
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<span key={key} style={{ position: (direction * style.y) > 0 ? 'absolute' : 'static', transform: `translateY(${style.y * 100}%)` }}><FormattedNumber value={data} /></span>
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))}
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</span>
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)}
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</TransitionMotion>
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);
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}
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}
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