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