/* *  06/27/2002 - 20:54:54 * *  JMonthChooser.java  - A bean for choosing a month *  Copyright (C) 2002 Kai Toedter *  kai@toedter.com *  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.calendar;import java.awt.Adjustable;import java.awt.BorderLayout;import java.awt.Dimension;import java.awt.event.AdjustmentEvent;import java.awt.event.AdjustmentListener;import java.awt.event.ItemEvent;import java.awt.event.ItemListener;import java.text.DateFormatSymbols;import java.util.Calendar;import java.util.Locale;import javax.swing.JComboBox;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JScrollBar;/** *  JMonthChooser is a bean for choosing a month. * *@author     Kai Toedter *@version    1.1.3 07/16/02 */public class JMonthChooser extends JPanel implements ItemListener,		AdjustmentListener {	/**	 * 	 */	private static final long serialVersionUID = 4121138021874874419L;	/**	 *  Displays a JSpinField on the right	 */	public final static int RIGHT_SPINNER = 0;	/**	 *  Displays a JSpinField on the left	 */	public final static int LEFT_SPINNER = 1;	/**	 *  Displays no JSpinField	 */	public final static int NO_SPINNER = 2;	/**	 *  Default JMonthChooser constructor.	 */	public JMonthChooser() {		this(RIGHT_SPINNER);	}	/**	 *  JMonthChooser constructor with month spinner parameter.	 *	 *@param  spinner  Possible values are RIGHT_SPINNER, LEFT_SPINNER, NO_SPINNER	 */	public JMonthChooser(int spinner) {		super();		setLayout(new BorderLayout());		comboBox = new JComboBox();		comboBox.addItemListener(this);		dayChooser = null;		locale = Locale.getDefault();		initNames();		add(comboBox, BorderLayout.CENTER);		if (spinner != NO_SPINNER) {			// 10000 possible clicks in both directions should be enough :)			scrollBar =					new JScrollBar(Adjustable.VERTICAL, 0, 0, -10000,					10000);			scrollBar.setPreferredSize(					new Dimension(scrollBar.getPreferredSize().width,					this.getPreferredSize().height));			scrollBar.setVisibleAmount(0);			scrollBar.addAdjustmentListener(this);			if (spinner == RIGHT_SPINNER) {				add(scrollBar, BorderLayout.EAST);			} else {				add(scrollBar, BorderLayout.WEST);			}		}		initialized = true;		setMonth(Calendar.getInstance().get(Calendar.MONTH));	}	/**	 *  Initializes the locale specific month names.	 */	public void initNames() {		localInitialize = true;		DateFormatSymbols dateFormatSymbols = new DateFormatSymbols(locale);		String[] monthNames = dateFormatSymbols.getMonths();		if (comboBox.getItemCount() == 12) {			comboBox.removeAllItems();		}		for (int i = 0; i < 12; i++) {			comboBox.addItem(monthNames[i]);		}		localInitialize = false;		comboBox.setSelectedIndex(month);	}	/**	 *  The ItemListener for the months.	 *	 *@param  iEvt  Description of the Parameter	 */	public void itemStateChanged(ItemEvent iEvt) {		int index = comboBox.getSelectedIndex();		if (index >= 0) {			setMonth(index, false);		}	}	/**	 *  The 2 buttons are implemented with a JScrollBar.	 *	 *@param  e  Description of the Parameter	 */	public void adjustmentValueChanged(AdjustmentEvent e) {		boolean increase = true;		int newScrollBarValue = e.getValue();		if (newScrollBarValue > oldScrollBarValue) {			increase = false;		}		oldScrollBarValue = newScrollBarValue;		int month = getMonth();		if (increase) {			month += 1;			if (month == 12) {				month = 0;				if (yearChooser != null) {					int year = yearChooser.getYear();					year += 1;					yearChooser.setYear(year);				}			}		} else {			month -= 1;			if (month == -1) {				month = 11;				if (yearChooser != null) {					int year = yearChooser.getYear();					year -= 1;					yearChooser.setYear(year);				}			}		}		setMonth(month);	}	/**	 *  Sets the month attribute of the JMonthChooser object	 *	 *@param  newMonth  The new month value	 *@param  select    The new month value	 */	private void setMonth(int newMonth, boolean select) {		if (!initialized || localInitialize) {			return;		}		int oldMonth = month;		month = newMonth;		if (select) {			comboBox.setSelectedIndex(month);		}		if (dayChooser != null) {			dayChooser.setMonth(month);		}		firePropertyChange("month", oldMonth, month);	}	/**	 *  Sets the month. This is a bound property.	 *	 *@param  newMonth  The new month value	 *@see              #getMonth	 */	public void setMonth(int newMonth) {		setMonth(newMonth, true);	}	/**	 *  Returns the month.	 *	 *@return    The month value	 *@see       #setMonth	 */	public int getMonth() {		return month;	}	/**	 *  Convenience method set a day chooser.	 *	 *@param  dayChooser  the day chooser	 */	public void setDayChooser(JDayChooser dayChooser) {		this.dayChooser = dayChooser;	}	/**	 *  Convenience method set a year chooser. If set, the spin buttons will spin	 *  the year as well	 *	 *@param  yearChooser  The new yearChooser value	 */	public void setYearChooser(JYearChooser yearChooser) {		this.yearChooser = yearChooser;	}	/**	 *  Returns the locale.	 *	 *@return    The locale value	 *@see       #setLocale	 */	public Locale getLocale() {		return locale;	}	/**	 *  Set the locale and initializes the new month names.	 *	 *@param  l  The new locale value	 *@see       #getLocale	 */	public void setLocale(Locale l) {		if (!initialized) {			super.setLocale(l);		} else {			locale = l;			initNames();		}	}	/**	 *  Enable or disable the JMonthChooser.	 *	 *@param  enabled  The new enabled value	 */	public void setEnabled(boolean enabled) {		super.setEnabled(enabled);		comboBox.setEnabled(enabled);		if (scrollBar != null) {			scrollBar.setEnabled(enabled);		}	}	/**	 *  Creates a JFrame with a JMonthChooser inside and can be used for testing.	 *	 *@param  s  The command line arguments	 */	public static void main(String[] s) {		JFrame frame = new JFrame("MonthChooser");		frame.getContentPane().add(new JMonthChooser());		frame.pack();		frame.setVisible(true);	}	private Locale locale;	private int month;	private int oldScrollBarValue = 0;	// needed for comparison	private JDayChooser dayChooser = null;	private JYearChooser yearChooser = null;	private JComboBox comboBox;	private JScrollBar scrollBar;	private boolean initialized = false;	private boolean localInitialize = false;}