57 lines
1.6 KiB
TypeScript
57 lines
1.6 KiB
TypeScript
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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> = ({
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value,
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obfuscate,
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})=> {
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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(() => ({ y: spring(1 * direction, { damping: 35, stiffness: 400 }) }), [direction]);
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if (reduceMotion) {
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return obfuscate ? <>{obfuscatedCount(value)}</> : <ShortNumber value={value} />;
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}
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const styles = [{
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key: `${value}`,
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data: value,
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style: { y: spring(0, { damping: 35, stiffness: 400 }) },
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}];
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return (
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<TransitionMotion styles={styles} willEnter={willEnter} willLeave={willLeave}>
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{items => (
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<span className='animated-number'>
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{items.map(({ key, data, style }) => (
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<span key={key} style={{ position: (direction * style.y) > 0 ? 'absolute' : 'static', transform: `translateY(${style.y * 100}%)` }}>{obfuscate ? obfuscatedCount(data) : <ShortNumber 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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