com.toedter.jcalendar.core.DateChooser.java Source code

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Here is the source code for com.toedter.jcalendar.core.DateChooser.java

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/*******************************************************************************
 * Copyright (c) 2011 Kai Tdter
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Kai Tdter - initial API and implementation
 *******************************************************************************/

package com.toedter.jcalendar.core;

import java.text.DateFormatSymbols;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Locale;

import org.joda.time.DateTime;
import org.joda.time.Days;

/**
 * This class provides functionality for choosing a date.
 * 
 * @author Kai Toedter
 * 
 */
public class DateChooser implements IDateChooserPresenter {

    private DateTime dateTime;
    private IDateChooserView view;
    private final List<IDayCell> dayCells;
    private final Locale locale;
    private List<String> weekdays;

    private class DayCell implements IDateChooserPresenter.IDayCell {
        String dayText;

        @Override
        public String getDayText() {
            return dayText;
        }

        @Override
        public boolean isEnabled() {
            return false;
        }

    }

    /**
     * Constructs an instance using today.
     */
    public DateChooser() {
        this(new DateTime());
    }

    /**
     * Constructs an instance from a given Date.
     * 
     * @param date
     *            the initializing Date
     */
    public DateChooser(Date date) {
        this(new DateTime(date));
    }

    /**
     * Constructs an instance from a given Calendar.
     * 
     * @param calendar
     *            the initializing Calendar
     */
    public DateChooser(Calendar calendar) {
        this(new DateTime(calendar));
    }

    /**
     * Constructs an instance from a given DateTime.
     * 
     * @param calendar
     *            the initializing DateTime
     */
    public DateChooser(DateTime dateTime) {
        // normalize to year/month/date only
        this.dateTime = new DateTime(dateTime.getYear(), dateTime.getMonthOfYear(), dateTime.getDayOfMonth(), 0, 0,
                0, 0);
        dayCells = new ArrayList<IDayCell>(42);
        for (int i = 0; i < 42; i++) {
            DayCell dayCell = new DayCell();
            dayCells.add(dayCell);
        }

        locale = Locale.getDefault();
        computeWeekdayNames();
        computeDayCellValues();
    }

    private void computeDayCellValues() {
        DateTime firstDayThisMonth = new DateTime(dateTime.getYear(), dateTime.getMonthOfYear(), 1, 0, 0, 0, 0);
        DateTime firstDayNextMonth = firstDayThisMonth.plusMonths(1).withDayOfMonth(1);
        int dayOfWeek = firstDayThisMonth.dayOfWeek().get();

        Days d = Days.daysBetween(firstDayThisMonth, firstDayNextMonth);
        int daysInThisMonth = d.getDays();
        System.out.println(daysInThisMonth);

        int index = 2;
        for (IDayCell dayCell : dayCells) {
            if (index <= dayOfWeek || index - dayOfWeek > daysInThisMonth) {
                ((DayCell) dayCell).dayText = "";
            } else {
                ((DayCell) dayCell).dayText = "" + (index - dayOfWeek);
            }
            index++;
        }
    }

    private void computeWeekdayNames() {
        int firstDayOfWeek = Calendar.getInstance().getFirstDayOfWeek();
        DateFormatSymbols dateFormatSymbols = new DateFormatSymbols(locale);
        String[] dayNames = dateFormatSymbols.getShortWeekdays();
        weekdays = new ArrayList<String>();

        int day = firstDayOfWeek;

        for (int i = 0; i < 7; i++) {
            weekdays.add(dayNames[day]);
            if (day < 7) {
                day++;
            } else {
                day -= 6;
            }
        }
    }

    public DateTime getDateTime() {
        return dateTime;
    }

    public void setDateTime(DateTime dateTime) {
        this.dateTime = dateTime;
    }

    public Date getDate() {
        return dateTime.toDate();
    }

    public Calendar getCalendar() {
        return dateTime.toCalendar(null);
    }

    @Override
    public void setView(IDateChooserView view) {
        this.view = view;
        this.view.updateDays(dayCells);
        this.view.updateWeekDayNames(weekdays);
    }
}