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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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package com.toedter.calendar;

import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

import javax.swing.JComponent;
import javax.swing.JFormattedTextField;
import javax.swing.JSpinner;
import javax.swing.SpinnerDateModel;
import javax.swing.UIManager;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

/**
 * JSpinnerDateEditor is a date editor based on a JSpinner.
 * 
 * @author Kai Toedter
 * @version $LastChangedRevision: 147 $
 * @version $LastChangedDate: 2011-06-06 20:36:53 +0200 (Mo, 06 Jun 2011) $
 */
public class JSpinnerDateEditor extends JSpinner implements IDateEditor,
		FocusListener, ChangeListener {

	private static final long serialVersionUID = 5692204052306085316L;

	protected Date date;

	protected String dateFormatString;

	protected SimpleDateFormat dateFormatter;

	public JSpinnerDateEditor() {
		super(new SpinnerDateModel());
		dateFormatter = (SimpleDateFormat) DateFormat
				.getDateInstance(DateFormat.MEDIUM);
		((JSpinner.DateEditor) getEditor()).getTextField().addFocusListener(
				this);
		DateUtil dateUtil = new DateUtil();
		setMinSelectableDate(dateUtil.getMinSelectableDate());
		setMaxSelectableDate(dateUtil.getMaxSelectableDate());
		((JSpinner.DateEditor)getEditor()).getTextField().setFocusLostBehavior(JFormattedTextField.PERSIST);
		addChangeListener(this);
	}

	public Date getDate() {
		if (date == null) {
			return null;
		}
		return ((SpinnerDateModel) getModel()).getDate();
	}

	public void setDate(Date date) {
		setDate(date, true);
	}
	
	public void setDate(Date date, boolean updateModel) {
		Date oldDate = this.date;
		this.date = date;
		if (date == null) {
			((JSpinner.DateEditor) getEditor()).getFormat().applyPattern("");
			((JSpinner.DateEditor) getEditor()).getTextField().setText("");
		} else if (updateModel) {
			if (dateFormatString != null) {
				((JSpinner.DateEditor) getEditor()).getFormat().applyPattern(
						dateFormatString);
			}
			((SpinnerDateModel) getModel()).setValue(date);
		}
		firePropertyChange("date", oldDate, date);
	}

	public void setDateFormatString(String dateFormatString) {
		try {
			dateFormatter.applyPattern(dateFormatString);
		} catch (RuntimeException e) {
			dateFormatter = (SimpleDateFormat) DateFormat
					.getDateInstance(DateFormat.MEDIUM);
			dateFormatter.setLenient(false);
		}
		this.dateFormatString = dateFormatter.toPattern();
		setToolTipText(this.dateFormatString);

		if (date != null) {
			((JSpinner.DateEditor) getEditor()).getFormat().applyPattern(
					this.dateFormatString);
		} else {
			((JSpinner.DateEditor) getEditor()).getFormat().applyPattern("");
		}

		if (date != null) {
			String text = dateFormatter.format(date);
			((JSpinner.DateEditor) getEditor()).getTextField().setText(text);
		}
	}

	public String getDateFormatString() {
		return dateFormatString;
	}

	public JComponent getUiComponent() {
		return this;
	}

	public void setLocale(Locale locale) {
		super.setLocale(locale);
		dateFormatter = (SimpleDateFormat) DateFormat.getDateInstance(
				DateFormat.MEDIUM, locale);
		setEditor(new JSpinner.DateEditor(this, dateFormatter.toPattern()));
		setDateFormatString(dateFormatter.toPattern());
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.awt.event.FocusListener#focusLost(java.awt.event.FocusEvent)
	 */
	public void focusLost(FocusEvent focusEvent) {
		String text = ((JSpinner.DateEditor) getEditor()).getTextField()
				.getText();
		if (text.length() == 0) {
			setDate(null);
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.awt.event.FocusListener#focusGained(java.awt.event.FocusEvent)
	 */
	public void focusGained(FocusEvent e) {
	}

	/**
	 * Enables and disabled the compoment. It also fixes the background bug
	 * 4991597 and sets the background explicitely to a
	 * TextField.inactiveBackground.
	 */
	public void setEnabled(boolean b) {
		super.setEnabled(b);
		if (!b) {
			((JSpinner.DateEditor) getEditor()).getTextField().setBackground(
					UIManager.getColor("TextField.inactiveBackground"));
		}
	}

	/* (non-Javadoc)
	 * @see com.toedter.calendar.IDateEditor#getMaxSelectableDate()
	 */
	public Date getMaxSelectableDate() {
		return (Date) ((SpinnerDateModel) getModel()).getEnd();
	}

	/**
	 * @see com.toedter.calendar.IDateEditor#getMinSelectableDate()
	 */
	public Date getMinSelectableDate() {
		return (Date) ((SpinnerDateModel) getModel()).getStart();
	}

	/**
	 * @see com.toedter.calendar.IDateEditor#setMaxSelectableDate(java.util.Date)
	 */
	public void setMaxSelectableDate(Date max) {
		((SpinnerDateModel) getModel()).setEnd(max);
	}

	/**
	 * @see com.toedter.calendar.IDateEditor#setMinSelectableDate(java.util.Date)
	 */
	public void setMinSelectableDate(Date min) {
		((SpinnerDateModel) getModel()).setStart(min);
	}

	/**
	 * @see com.toedter.calendar.IDateEditor#setSelectableDateRange(java.util.Date, java.util.Date)
	 */
	public void setSelectableDateRange(Date min, Date max) {
		setMaxSelectableDate(max);
		setMinSelectableDate(min);
	}

	/**
	 * @see javax.swing.event.ChangeListener#stateChanged(javax.swing.event.ChangeEvent)
	 */
	public void stateChanged(ChangeEvent e) {
		setDate(((SpinnerDateModel) getModel()).getDate(), false);
	}

}