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import * as React from 'react';
import classNames from 'classnames';
export interface UnitNumberProps {
prefixCls: string;
value: string | number;
offset?: number;
current?: boolean;
}
const UnitNumber: React.FC<Readonly<UnitNumberProps>> = (props) => {
const { prefixCls, value, current, offset = 0 } = props;
let style: React.CSSProperties | undefined;
if (offset) {
style = { position: 'absolute', top: `${offset}00%`, left: 0 };
}
return (
<span style={style} className={classNames(`${prefixCls}-only-unit`, { current })}>
{value}
</span>
);
};
export interface SingleNumberProps {
prefixCls: string;
value: string;
count: number;
}
function getOffset(start: number, end: number, unit: -1 | 1) {
let index = start;
let offset = 0;
while ((index + 10) % 10 !== end) {
index += unit;
offset += unit;
}
return offset;
}
const SingleNumber: React.FC<Readonly<SingleNumberProps>> = (props) => {
const { prefixCls, count: originCount, value: originValue } = props;
const value = Number(originValue);
const count = Math.abs(originCount);
const [prevValue, setPrevValue] = React.useState(value);
const [prevCount, setPrevCount] = React.useState(count);
// ============================= Events =============================
const onTransitionEnd: React.TransitionEventHandler<HTMLSpanElement> = () => {
setPrevValue(value);
setPrevCount(count);
};
// Fallback if transition events are not supported
React.useEffect(() => {
const timer = setTimeout(onTransitionEnd, 1000);
return () => clearTimeout(timer);
}, [value]);
// ============================= Render =============================
// Render unit list
let unitNodes: React.ReactElement[];
let offsetStyle: React.CSSProperties | undefined;
if (prevValue === value || Number.isNaN(value) || Number.isNaN(prevValue)) {
// Nothing to change
unitNodes = [<UnitNumber {...props} key={value} current />];
offsetStyle = {
transition: 'none',
};
} else {
unitNodes = [];
// Fill basic number units
const end = value + 10;
const unitNumberList: number[] = [];
for (let index = value; index <= end; index += 1) {
unitNumberList.push(index);
}
const unit = prevCount < count ? 1 : -1;
// Fill with number unit nodes
const prevIndex = unitNumberList.findIndex((n) => n % 10 === prevValue);
// Cut list
const cutUnitNumberList =
unit < 0 ? unitNumberList.slice(0, prevIndex + 1) : unitNumberList.slice(prevIndex);
unitNodes = cutUnitNumberList.map((n, index) => {
const singleUnit = n % 10;
return (
<UnitNumber
{...props}
key={n}
value={singleUnit}
offset={unit < 0 ? index - prevIndex : index}
current={index === prevIndex}
/>
);
});
// Calculate container offset value
offsetStyle = {
transform: `translateY(${-getOffset(prevValue, value, unit)}00%)`,
};
}
return (
<span className={`${prefixCls}-only`} style={offsetStyle} onTransitionEnd={onTransitionEnd}>
{unitNodes}
</span>
);
};
export default SingleNumber;
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