jcalendarpanel.java

日历控件

package de.wannawork.jcalendar;
/*
 * Copyright (c) 2003, Bodo Tasche (http://www.wannawork.de)
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright notice, this 
 *       list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright notice, this 
 *       list of conditions and the following disclaimer in the documentation and/or other 
 *       materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS 
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Locale;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JPanel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

/**
 * This JCalendarPanel shows a Calendar.
 * 
 * It is coded with 2 rules:
 * <ul>
 * <li>No hard coded Fonts or Colors, use the current Look and Feel</li>
 * <li>No hard coded locale behaviour, use the given Locale (Start of Week, Name of Days/Months)</li>
 * </ul>
 *
 * You can add a ChangeListener to this JCalendarPanel to receive 
 * change events.
 *  
 * @author Bodo Tasche, Scott Sirovy
 */
public class JCalendarPanel extends JPanel implements ItemListener, ChangeListener {

	/**
	 * Creates a Calendar using the current Date and 
	 * current Local settings.
	 */
	public JCalendarPanel() {
		createGUI(Calendar.getInstance(), Locale.getDefault(), DateFormat.getDateInstance(DateFormat.MEDIUM, Locale.getDefault()), true);
	}

	/**
	 * Creates a Calendar using the cal-Date and 
	 * current Locale Settings. It doesn't use
	 * the Locale in the Calendar-Object !
	 * 
	 * @param cal Calendar to use
	 */
	public JCalendarPanel(Calendar cal) {
		createGUI(cal, Locale.getDefault(), DateFormat.getDateInstance(DateFormat.MEDIUM, Locale.getDefault()), true);
	}

	/**
	 * Creates a Calendar using the current Date
	 * and the given Locale Settings.
	 * 
	 * @param locale Locale to use
	 */
	public JCalendarPanel(Locale locale) {
		createGUI(Calendar.getInstance(locale), locale, DateFormat.getDateInstance(DateFormat.MEDIUM, locale), true);
	}

	/**
	 * Creates a Calender using the given Date and
	 * Locale 
	 * 
	 * @param cal Calendar to use
	 * @param locale Locale to use
	 */
	public JCalendarPanel(Calendar cal, Locale locale) {
		createGUI(cal, locale, DateFormat.getDateInstance(DateFormat.MEDIUM, locale), true);
	}

	/**
	 * Creates a Calender using the given Calendar,
	 * Locale and DateFormat.
	 * 
	 * @param cal Calendar to use
	 * @param locale Locale to use
	 * @param dateFormat DateFormat for the ComboBox
	 */
	public JCalendarPanel(Calendar cal, Locale locale, DateFormat dateFormat) {
		createGUI(cal, locale, dateFormat, true);
	}

	/**
	 * Creates a Calender using the given Calendar,
	 * Locale and DateFormat.
	 * 
	 * @param cal Calendar to use
	 * @param locale Locale to use
	 * @param dateFormat DateFormat for the ComboBox
	 * @param flat Flat Buttons for Navigation at the Bottom ?
	 */
	public JCalendarPanel(Calendar cal, Locale locale, DateFormat dateFormat, boolean flat) {
		createGUI(cal, locale, dateFormat, flat);
	}

	/**
	 * Creates the GUI
	 * 
	 * @param cal Calendar to use
	 * @param locale Locale to use
	 * @param dateFormat DateFormat to use
	 * @param flat Flat Buttons for Navigation at the Bottom ?
	 */
	private void createGUI(Calendar cal, Locale locale, DateFormat dateFormat, boolean flat) {
		_locale = locale;
		_cal = Calendar.getInstance(locale);
		_cal.set(Calendar.DAY_OF_MONTH, cal.get(Calendar.DAY_OF_MONTH));
		_cal.set(Calendar.MONTH, cal.get(Calendar.MONTH));
		_cal.set(Calendar.YEAR, cal.get(Calendar.YEAR));
		_format = dateFormat;

		setLayout(new GridBagLayout());

		GridBagConstraints c = new GridBagConstraints();

		_month = createMonth();
		_month.addItemListener(this);
		add(_month, c);

		_year = createYear();
		_year.addItemListener(this);

		c.gridwidth = GridBagConstraints.REMAINDER;

		add(_year, c);

		c.anchor = GridBagConstraints.CENTER;
		c.fill = GridBagConstraints.BOTH;
		c.insets = new Insets(1, 1, 1, 1);

		_monthPanel = new JMonthPanel(_cal, _locale);
		_monthPanel.addChangeListener(this);

		add(_monthPanel, c);

		c.insets = new Insets(0, 0, 1, 0);
		add(createButtonPanel(flat), c);
		
		_monthPanel.grabFocus();
	}

	/**
	 * Creates the ButtonPanel on the bottom
	 * @param flat Flat Buttons for Navigation at the Bottom ?
	 * @return JPanel with Buttons
	 */
	private JPanel createButtonPanel(boolean flat) {
		JPanel buttonpanel = new JPanel();

		JButton yearLeft;
		JButton dayLeft;
		JButton today;
		JButton dayRight;
		JButton yearRight;

		if (flat) {
			yearLeft = new FlatButton("<<"); //$NON-NLS-1$
			dayLeft = new FlatButton("<"); //$NON-NLS-1$
			today = new FlatButton(LocaleStrings.getString("JCalendarPanel.Today")); //$NON-NLS-1$
			dayRight = new FlatButton(">"); //$NON-NLS-1$
			yearRight = new FlatButton(">>"); //$NON-NLS-1$
		} else {
			yearLeft = new JButton("<<"); //$NON-NLS-1$
			yearLeft.setMargin(new Insets(1, 1, 1, 1));
			dayLeft = new JButton("<"); //$NON-NLS-1$
			dayLeft.setMargin(new Insets(1, 1, 1, 1));
			today = new JButton(LocaleStrings.getString("JCalendarPanel.Today")); //$NON-NLS-1$
			today.setMargin(new Insets(2, 2, 2, 2));
			dayRight = new JButton(">"); //$NON-NLS-1$
			dayRight.setMargin(new Insets(1, 1, 1, 1));
			yearRight = new JButton(">>"); //$NON-NLS-1$
			yearRight.setMargin(new Insets(1, 1, 1, 1));
		}


		buttonpanel.setLayout(new GridBagLayout());
		GridBagConstraints c = new GridBagConstraints();
		c.fill = GridBagConstraints.NONE;
		c.insets = new Insets(0, 0, 0, 5);

		yearLeft.setMargin(new Insets(1, 1, 1, 1));
		yearLeft.setToolTipText(LocaleStrings.getString("JCalendarPanel.Last_Year")); //$NON-NLS-1$
		yearLeft.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if (_year.getSelectedIndex() > 0) {
				    
				    int month = _cal.get(Calendar.MONTH);
					_cal.set(Calendar.YEAR,_cal.get(Calendar.YEAR) - 1);
					if (_cal.get(Calendar.MONTH) != month) {
					    _cal.set(Calendar.MONTH, month);
					}
					setCalendar(_cal);
				}
			}
		});
		buttonpanel.add(yearLeft, c);

		dayLeft.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
                int monthIndex = _cal.get(Calendar.MONTH);
                _cal.set(Calendar.MONTH, monthIndex - 1);
                if (_cal.get(Calendar.MONTH) == monthIndex) {
                    _cal.set(Calendar.DAY_OF_MONTH, 0);
                }
				setCalendar(_cal);
			}
		});

		dayLeft.setMargin(new Insets(1, 1, 1, 1));
		dayLeft.setToolTipText(LocaleStrings.getString("JCalendarPanel.Last_Month")); //$NON-NLS-1$

		buttonpanel.add(dayLeft, c);


		GridBagConstraints c2 = new GridBagConstraints();
		c2.fill = GridBagConstraints.HORIZONTAL;
		c2.weightx = 1.0;
		
		today.setMargin(new Insets(2, 2, 2, 2));
		today.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				setCalendar(Calendar.getInstance());
			}
		});
		buttonpanel.add(today, c2);

		c.insets = new Insets(0, 5, 0, 0);

		dayRight.setMargin(new Insets(1, 1, 1, 1));
		dayRight.setToolTipText(LocaleStrings.getString("JCalendarPanel.Next_Month")); //$NON-NLS-1$
		dayRight.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
                int monthIndex = _cal.get(Calendar.MONTH);
				_cal.set(Calendar.MONTH, monthIndex + 1);
                if (_cal.get(Calendar.MONTH) != (monthIndex + 1 ) % 12) {
                    _cal.set(Calendar.DAY_OF_MONTH, 0);
                }
				setCalendar(_cal);
			}
		});		
		buttonpanel.add(dayRight, c);

		yearRight.setMargin(new Insets(1, 1, 1, 1));
		yearRight.setToolTipText(LocaleStrings.getString("JCalendarPanel.Next_Year")); //$NON-NLS-1$
		yearRight.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if (_year.getSelectedIndex() < _year.getItemCount() - 1) {
				    int month = _cal.get(Calendar.MONTH);
					_cal.set(Calendar.YEAR,_cal.get(Calendar.YEAR) + 1);
					if (_cal.get(Calendar.MONTH) != month) {
					    _cal.set(Calendar.MONTH, month);
					}
					
					setCalendar(_cal);
				}
			}
		});