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import React from 'react';
import cn from 'classnames';
import propTypes from 'prop-types';
import style from './index.less';
const render = (data) => (
<div className={style.number}>
{
data.map((e, k) => (
<span className={cn(['bg', style[`s_${e}`]])} key={k} />
))
}
</div>
);
const formate = (num) => (
num < 10 ? `0${num}`.split('') : `${num}`.split('')
);
export default class Number extends React.Component {
constructor() {
super();
this.state = {
time_count: false,
time: new Date(),
};
}
componentWillMount() {
if (!this.props.time) {
return;
}
const clock = () => {
const count = +Number.timeInterval;
Number.timeInterval = setTimeout(() => {
this.setState({
time: new Date(),
time_count: count, // 用来做 shouldComponentUpdate 优化
});
clock();
}, 1000);
};
clock();
}
shouldComponentUpdate({ number }) {
if (this.props.time) { // 右下角时钟
if (this.state.time_count !== Number.time_count) {
if (this.state.time_count !== false) {
Number.time_count = this.state.time_count; // 记录clock上一次的缓存
}
return true;
}
return false; // 经过判断这次的时间已经渲染, 返回false
}
return this.props.number !== number;
}
componentWillUnmount() {
if (!this.props.time) {
return;
}
clearTimeout(Number.timeInterval);
}
render() {
if (this.props.time) { // 右下角时钟
const now = this.state.time;
const hour = formate(now.getHours());
const min = formate(now.getMinutes());
const sec = now.getSeconds() % 2;
const t = hour.concat(sec ? 'd' : 'd_c', min);
return (render(t));
}
const num = `${this.props.number}`.split('');
for (let i = 0, len = this.props.length - num.length; i < len; i++) {
num.unshift('n');
}
return (render(num));
}
}
Number.statics = {
timeInterval: null,
time_count: null,
};
Number.propTypes = {
number: propTypes.number,
length: propTypes.number,
time: propTypes.bool,
};
Number.defaultProps = {
length: 6,
};
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