69 lines
2.6 KiB
Plaintext
69 lines
2.6 KiB
Plaintext
import React, { useState, useMemo } from 'react';
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import './Calendar.css';
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const WEEKS = ['日', '一', '二', '三', '四', '五', '六'];
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function fmt(dt) {
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const p = x => (x < 10 ? '0' + x : '' + x);
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return dt.getFullYear() + '-' + p(dt.getMonth() + 1) + '-' + p(dt.getDate());
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}
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export default function Calendar({ value = '', onChange }) {
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const now = new Date();
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const [viewY, setViewY] = useState(now.getFullYear());
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const [viewM, setViewM] = useState(now.getMonth());
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const [selected, setSelected] = useState(value);
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const today = fmt(now);
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const cells = useMemo(() => {
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const first = new Date(viewY, viewM, 1).getDay();
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const days = new Date(viewY, viewM + 1, 0).getDate();
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const prevDays = new Date(viewY, viewM, 0).getDate();
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const arr = [];
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for (let i = 0; i < first; i++) {
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let pd = prevDays - first + 1 + i, pm = viewM - 1, py = viewY;
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if (pm < 0) { pm = 11; py--; }
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arr.push({ day: pd, out: true, key: fmt(new Date(py, pm, pd)) });
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}
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for (let d = 1; d <= days; d++) {
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const k = fmt(new Date(viewY, viewM, d));
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arr.push({ day: d, out: false, today: k === today, key: k });
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}
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const tail = (7 - (arr.length % 7)) % 7;
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for (let t = 1; t <= tail; t++) {
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let nm = viewM + 1, ny = viewY; if (nm > 11) { nm = 0; ny++; }
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arr.push({ day: t, out: true, key: fmt(new Date(ny, nm, t)) });
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}
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return arr;
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}, [viewY, viewM, today]);
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function prev() { let m = viewM - 1, y = viewY; if (m < 0) { m = 11; y--; } setViewM(m); setViewY(y); }
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function next() { let m = viewM + 1, y = viewY; if (m > 11) { m = 0; y++; } setViewM(m); setViewY(y); }
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function pick(c) {
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setSelected(c.key);
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setViewY(parseInt(c.key.slice(0, 4), 10));
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setViewM(parseInt(c.key.slice(5, 7), 10) - 1);
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onChange && onChange(c.key);
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}
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return (
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<div className="aa-calendar">
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<div className="aa-calendar-head">
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<button className="aa-calendar-nav" onClick={prev}>‹</button>
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<span className="aa-calendar-title">{viewY} 年 {viewM + 1} 月</span>
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<button className="aa-calendar-nav" onClick={next}>›</button>
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</div>
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<div className="aa-calendar-week">
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{WEEKS.map(w => <span className="aa-calendar-weekday" key={w}>{w}</span>)}
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</div>
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<div className="aa-calendar-grid">
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{cells.map((c, i) => (
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<div key={i} className={'aa-calendar-cell' + (c.out ? ' is-out' : '') + (c.today ? ' is-today' : '') + (c.key === selected ? ' is-selected' : '')}
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onClick={() => pick(c)}>
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{c.day}
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</div>
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))}
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</div>
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</div>
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);
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}
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