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JCalendar is a Java date chooser bean for graphically picking a date. JCalendar is composed of several other Java beans, a JDayChooser, a JMonthChooser and a JYearChooser. All these beans have a locale property, provide several icons (Color 16x16, Color 32x32, Mono 16x16 and Mono 32x32) and their own locale property editor. So they can easily be used in GUI builders. Also part of the package is a JDateChooser, a bean composed of an IDateEditor (for direct date editing) and a button for opening a JCalendar for selecting the date.

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/*
 *  JLocaleChooser.java  - A bean for choosing locales
 *  Copyright (C) 2004 Kai Toedter
 *  [email protected]
 *  www.toedter.com
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package com.toedter.components;

import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.util.Calendar;
import java.util.Locale;

import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;

/**
 * JLocaleChooser is a bean for choosing locales.
 * 
 * @author Kai Toedter
 * @version $LastChangedRevision: 85 $
 * @version $LastChangedDate: 2006-04-28 13:50:52 +0200 (Fr, 28 Apr 2006) $
 */
public class JLocaleChooser extends JComboBox implements ItemListener {
	private static final long serialVersionUID = 8152430789764877431L;
	protected JComponent component;

	/**
	 * Default JLocaleChooser constructor.
	 */
	public JLocaleChooser() {
	    this(null);
	}

    /**
     * Returns "JLocaleChoose".
     *
     * @return the name value
     */
    public String getName() {
        return "JLocaleChoose";
    }

	/**
	 * Default JLocaleChooser constructor.
	 */
	public JLocaleChooser(JComponent component) {
		super();
		this.component = component;
		addItemListener(this);
		locales = Calendar.getAvailableLocales();
		localeCount = locales.length;

		for (int i = 0; i < localeCount; i++) {
			if (locales[i].getCountry().length() > 0) {
				addItem(locales[i].getDisplayName());
			}
		}

		setLocale(Locale.getDefault());
	}

	/**
	 * The ItemListener for the locales.
	 */
	public void itemStateChanged(ItemEvent iEvt) {
		String item = (String) iEvt.getItem();
		int i;

		for (i = 0; i < localeCount; i++) {
			if (locales[i].getDisplayName().equals(item))
				break;
		}
		setLocale(locales[i], false);
	}

	/**
	 * Sets the locale.
	 * 
	 * @see #getLocale
	 */
	private void setLocale(Locale l, boolean select) {
		Locale oldLocale = locale;
		locale = l;
		int n = 0;

		if (select) {
			for (int i = 0; i < localeCount; i++) {
				if (locales[i].getCountry().length() > 0) {
					if (locales[i].equals(locale))
						setSelectedIndex(n);
					n += 1;
				}
			}
		}

		firePropertyChange("locale", oldLocale, locale);
		if(component != null) {
		    component.setLocale(l);
		}
	}

	/**
	 * Sets the locale. This is a bound property.
	 * 
	 * @see #getLocale
	 */
	public void setLocale(Locale l) {
		setLocale(l, true);
	}

	/**
	 * Returns the locale.
	 */
	public Locale getLocale() {
		return locale;
	}

	/**
	 * Creates a JFrame with a JLocaleChooser inside and can be used for
	 * testing.
	 */
	static public void main(String[] s) {
		JFrame frame = new JFrame("LocaleChooser");
		frame.getContentPane().add(new JLocaleChooser());
		frame.pack();
		frame.setVisible(true);
	}

	private Locale[] locales;
	private Locale locale;
	private int localeCount;
}