82 lines
1.9 KiB
TypeScript
82 lines
1.9 KiB
TypeScript
import { useCallback, useState } from 'react';
|
|
import * as React from 'react';
|
|
|
|
import { TransitionMotion, spring } from 'react-motion';
|
|
|
|
import { reduceMotion } from '../initial_state';
|
|
|
|
import { ShortNumber } from './short_number';
|
|
|
|
const obfuscatedCount = (count: number) => {
|
|
if (count < 0) {
|
|
return 0;
|
|
} else if (count <= 1) {
|
|
return count;
|
|
} else {
|
|
return '1+';
|
|
}
|
|
};
|
|
|
|
interface 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 as number)
|
|
) : (
|
|
<ShortNumber value={data as number} />
|
|
)}
|
|
</span>
|
|
))}
|
|
</span>
|
|
)}
|
|
</TransitionMotion>
|
|
);
|
|
};
|