218 lines
8.6 KiB
TypeScript
218 lines
8.6 KiB
TypeScript
import React, { useState, useEffect } from 'react';
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import { format } from 'date-fns';
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import './custom-toolbar.css';
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interface CustomToolbarProps {
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// Das aktuell angezeigte Datum (wird z. B. von der Calendar-Komponente geliefert)
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date: Date;
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// Aktuelle Ansicht: "month", "week", "day" oder "agenda"
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view: 'month' | 'week' | 'day' | 'agenda';
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/**
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* onNavigate ermöglicht das Wechseln des angezeigten Datums.
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* Action kann bspw. 'TODAY' oder 'SET_DATE' sein; newDate wird übergeben, wenn benötigt.
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*/
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onNavigate: (action: string, newDate?: Date) => void;
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// onView wechselt die Ansicht
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onView: (newView: 'month' | 'week' | 'day' | 'agenda') => void;
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}
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const CustomToolbar: React.FC<CustomToolbarProps> = ({ date, view, onNavigate, onView }) => {
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// Hilfsfunktion, um die ISO-Wochennummer eines Datums zu ermitteln
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const getISOWeek = (date: Date): number => {
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const tmp = new Date(date.getTime());
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// Verschiebe das Datum so, dass der nächste Donnerstag erreicht wird (ISO: Woche beginnt am Montag)
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tmp.setDate(tmp.getDate() + 4 - (tmp.getDay() || 7));
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const yearStart = new Date(tmp.getFullYear(), 0, 1);
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const weekNo = Math.ceil((((tmp.getTime() - yearStart.getTime()) / 86400000) + 1) / 7);
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return weekNo;
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};
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// Neue Funktion: Ermittelt das ISO-Wochenjahr eines Datums.
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// Das ISO-Wochenjahr entspricht dem Jahr des Donnerstags in dieser Woche.
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const getISOWeekYear = (date: Date): number => {
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const tmp = new Date(date.getTime());
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tmp.setDate(tmp.getDate() + 4 - (tmp.getDay() || 7));
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return tmp.getFullYear();
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};
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// Ermittelt die Anzahl der ISO-Wochen im Jahr
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const getISOWeeksInYear = (year: number): number => {
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const d = new Date(year, 11, 31);
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const week = getISOWeek(d);
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return week === 1 ? getISOWeek(new Date(year, 11, 24)) : week;
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};
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/*
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Berechnet den Montag der gewünschten ISO-Woche eines Jahres.
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Wir ermitteln zunächst den ersten Montag der ersten ISO-Woche und addieren dann (week - 1) * 7 Tage.
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*/
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const getDateOfISOWeek = (week: number, year: number): Date => {
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const jan1 = new Date(year, 0, 1);
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const dayOfWeek = jan1.getDay();
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const isoDayOfWeek = dayOfWeek === 0 ? 7 : dayOfWeek;
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let firstMonday: Date;
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if (isoDayOfWeek <= 4) {
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// Jan 1 gehört zur ersten ISO-Woche – bestimme den Montag dieser Woche
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firstMonday = new Date(year, 0, 1 - isoDayOfWeek + 1);
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} else {
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// Andernfalls liegt der erste Montag in der darauffolgenden Woche
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firstMonday = new Date(year, 0, 1 + (8 - isoDayOfWeek));
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}
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firstMonday.setDate(firstMonday.getDate() + (week - 1) * 7);
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return firstMonday;
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};
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// Lokaler State für Woche und ISO-Wochenjahr (statt des reinen Kalenderjahrs)
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const [selectedWeek, setSelectedWeek] = useState<number>(getISOWeek(date));
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const [selectedYear, setSelectedYear] = useState<number>(getISOWeekYear(date));
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// Aktualisiere die Auswahl, wenn sich die Prop "date" ändert
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useEffect(() => {
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setSelectedWeek(getISOWeek(date));
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setSelectedYear(getISOWeekYear(date));
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}, [date]);
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// Für die Dropdown-Liste der Wochen: Liste von 1 bis totalWeeks
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const totalWeeks = getISOWeeksInYear(selectedYear);
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const weekOptions = Array.from({ length: totalWeeks }, (_, i) => i + 1);
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// Beispielhafte Jahresliste: aktuelles ISO-Wochenjahr ± 10
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const yearOptions = Array.from({ length: 21 }, (_, i) => selectedYear - 10 + i);
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// Berechne den Start (Montag) und das Ende (Sonntag) der aktuell angezeigten Woche
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const weekStartDate = getDateOfISOWeek(selectedWeek, selectedYear);
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const weekEndDate = new Date(weekStartDate);
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weekEndDate.setDate(weekStartDate.getDate() + 6);
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// Ermittele Monat und Jahr von Start- und Enddatum (normales Kalenderjahr)
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const monthStart = format(weekStartDate, 'MMMM');
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const monthEnd = format(weekEndDate, 'MMMM');
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const yearAtStart = format(weekStartDate, 'yyyy');
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const yearAtEnd = format(weekEndDate, 'yyyy');
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// Erstelle das Label:
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// 1. Falls der Wochenanfang und das Wochenende in unterschiedlichen Jahren liegen,
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// wird z. B. "Dezember 2025 - Januar 2026" angezeigt.
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// 2. Liegen beide im gleichen Jahr, wird unterschieden zwischen gleichem Monat und unterschiedlichem Monat.
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let dateLabel: string;
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if (yearAtStart !== yearAtEnd) {
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dateLabel = `${monthStart} ${yearAtStart} - ${monthEnd} ${yearAtEnd}`;
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} else if (monthStart !== monthEnd) {
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dateLabel = `${monthStart} - ${monthEnd} ${yearAtStart}`;
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} else {
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dateLabel = `${monthStart} ${yearAtStart}`;
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}
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// Handler zum Wechseln der Ansicht
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const handleViewChange = (newView: 'month' | 'week' | 'day' | 'agenda') => {
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onView(newView);
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};
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// "Today"-Button: setzt das Datum auf das heutige Datum (unter Verwendung des ISO-Wochenjahrs)
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const handleToday = () => {
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const today = new Date();
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setSelectedWeek(getISOWeek(today));
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setSelectedYear(getISOWeekYear(today));
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onNavigate('TODAY', today);
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};
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// Wechselt zur vorherigen Woche. Bei Woche < 1, wird ins Vorjahr gewechselt.
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const handlePrevWeek = () => {
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let newWeek = selectedWeek - 1;
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let newYear = selectedYear;
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if (newWeek < 1) {
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newYear = selectedYear - 1;
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newWeek = getISOWeeksInYear(newYear);
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}
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setSelectedWeek(newWeek);
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setSelectedYear(newYear);
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const newDate = getDateOfISOWeek(newWeek, newYear);
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onNavigate('SET_DATE', newDate);
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};
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// Wechselt zur nächsten Woche. Überschreitet die Woche die maximale Zahl, wechselt ins nächste Jahr.
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const handleNextWeek = () => {
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let newWeek = selectedWeek + 1;
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let newYear = selectedYear;
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if (newWeek > getISOWeeksInYear(selectedYear)) {
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newYear = selectedYear + 1;
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newWeek = 1;
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}
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setSelectedWeek(newWeek);
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setSelectedYear(newYear);
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const newDate = getDateOfISOWeek(newWeek, newYear);
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onNavigate('SET_DATE', newDate);
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};
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// Handler, wenn der Nutzer über das Dropdown eine Woche auswählt
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const handleWeekChange = (event: React.ChangeEvent<HTMLSelectElement>) => {
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const newWeek = parseInt(event.target.value, 10);
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setSelectedWeek(newWeek);
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const newDate = getDateOfISOWeek(newWeek, selectedYear);
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onNavigate('SET_DATE', newDate);
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};
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// Handler, wenn der Nutzer über das Dropdown ein Jahr auswählt
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const handleYearChange = (event: React.ChangeEvent<HTMLSelectElement>) => {
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const newYear = parseInt(event.target.value, 10);
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setSelectedYear(newYear);
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const totalWeeksInNewYear = getISOWeeksInYear(newYear);
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const newWeek = Math.min(selectedWeek, totalWeeksInNewYear);
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setSelectedWeek(newWeek);
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const newDate = getDateOfISOWeek(newWeek, newYear);
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onNavigate('SET_DATE', newDate);
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};
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return (
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<div className="custom-toolbar" style={{ display: 'flex', flexDirection: 'initial', gap: '8px' }}>
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{/* Anzeige des Datums-Labels */}
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<div className="current-date" style={{ fontWeight: 'bold' }}>
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{dateLabel}
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</div>
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{/* Ansicht wechseln */}
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<div className='view-change'>
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<div className="view-switcher" style={{ display: 'flex', gap: '8px' }}>
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<button disabled={view === 'month'} onClick={() => handleViewChange('month')}>Month</button>
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<button disabled={view === 'week'} onClick={() => handleViewChange('week')}>Week</button>
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<button disabled={view === 'day'} onClick={() => handleViewChange('day')}>Day</button>
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<button disabled={view === 'agenda'} onClick={() => handleViewChange('agenda')}>Agenda</button>
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</div>
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</div>
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<div className="right-section" style={{ display: 'flex', flexDirection: 'initial', gap: '8px' }}>
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{/* Navigationsbuttons */}
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<div className="navigation-controls" style={{ display: 'flex', gap: '8px' }}>
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<div className="handleWeek">
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<button onClick={handlePrevWeek}><</button>
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<button onClick={handleNextWeek}>></button>
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</div>
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<div className="today">
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<button onClick={handleToday}>Today</button>
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</div>
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</div>
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{/* DropDowns für Woche und Jahr */}
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<div className="dropdowns" style={{ display: 'flex', gap: '8px' }}>
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<select value={selectedWeek} onChange={handleWeekChange}>
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{weekOptions.map((week) => (
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<option key={week} value={week}>
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Week {week}
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</option>
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))}
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</select>
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<select value={selectedYear} onChange={handleYearChange}>
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{yearOptions.map((year) => (
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<option key={year} value={year}>
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{year}
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</option>
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))}
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</select>
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</div>
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</div>
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</div>
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);
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};
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export default CustomToolbar;
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