74 lines
1.8 KiB
TypeScript
74 lines
1.8 KiB
TypeScript
import React, { useCallback, useState } from 'react';
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import ShortNumber from './short_number';
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import { TransitionMotion, spring } from 'react-motion';
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import { reduceMotion } from '../initial_state';
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const obfuscatedCount = (count: number) => {
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if (count < 0) {
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return 0;
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} else if (count <= 1) {
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return count;
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} else {
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return '1+';
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}
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};
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type Props = {
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value: number;
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obfuscate?: boolean;
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};
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export const AnimatedNumber: React.FC<Props> = ({ value, obfuscate }) => {
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const [previousValue, setPreviousValue] = useState(value);
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const [direction, setDirection] = useState<1 | -1>(1);
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if (previousValue !== value) {
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setPreviousValue(value);
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setDirection(value > previousValue ? 1 : -1);
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}
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const willEnter = useCallback(() => ({ y: -1 * direction }), [direction]);
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const willLeave = useCallback(
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() => ({ y: spring(1 * direction, { damping: 35, stiffness: 400 }) }),
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[direction]
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);
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if (reduceMotion) {
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return obfuscate ? (
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<>{obfuscatedCount(value)}</>
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) : (
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<ShortNumber value={value} />
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);
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}
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const styles = [
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{
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key: `${value}`,
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data: value,
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style: { y: spring(0, { damping: 35, stiffness: 400 }) },
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},
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];
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return (
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<TransitionMotion
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styles={styles}
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willEnter={willEnter}
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willLeave={willLeave}
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>
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{(items) => (
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<span className='animated-number'>
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{items.map(({ key, data, style }) => (
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<span
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key={key}
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style={{
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position: direction * style.y > 0 ? 'absolute' : 'static',
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transform: `translateY(${style.y * 100}%)`,
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}}
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>
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{obfuscate ? obfuscatedCount(data) : <ShortNumber value={data} />}
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</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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