datechooserpanel.java

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/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2004, by Object Refinery Limited and Contributors.
 * 
 * Project Info:  http://www.jfree.org/jcommon/index.html
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 * 
 * ---------------------
 * DateChooserPanel.java
 * ---------------------
 * (C) Copyright 2000-2004, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: DateChooserPanel.java,v 1.6 2005/06/01 14:12:29 taqua Exp $
 *
 * Changes (from 26-Oct-2001)
 * --------------------------
 * 26-Oct-2001 : Changed package to com.jrefinery.ui.* (DG);
 * 08-Dec-2001 : Dropped the getMonths() method (DG);
 * 13-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 *
 */

package org.jfree.ui;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DateFormatSymbols;
import java.util.Calendar;
import java.util.Date;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
import javax.swing.UIManager;

import org.jfree.date.SerialDate;

/**
 * A panel that allows the user to select a date.
 *
 * @author David Gilbert
 */
public class DateChooserPanel extends JPanel implements ActionListener {

    /**
     * The date selected in the panel.
     */
    private Calendar chosenDate;

    /**
     * The color for the selected date.
     */
    private Color chosenDateButtonColor;

    /**
     * The color for dates in the current month.
     */
    private Color chosenMonthButtonColor;

    /**
     * The color for dates that are visible, but not in the current month.
     */
    private Color chosenOtherButtonColor;

    /**
     * The first day-of-the-week.
     */
    private int firstDayOfWeek;

    /**
     * The range used for selecting years.
     */
    private int yearSelectionRange = 20;

    /**
     * The font used to display the date.
     */
    private Font dateFont = new Font("SansSerif", Font.PLAIN, 10);

    /**
     * A combo for selecting the month.
     */
    private JComboBox monthSelector;

    /**
     * A combo for selecting the year.
     */
    private JComboBox yearSelector;

    /**
     * A button for selecting today's date.
     */
    private JButton todayButton;

    /**
     * An array of buttons used to display the days-of-the-month.
     */
    private JButton[] buttons;

    /**
     * A flag that indicates whether or not we are currently refreshing the buttons.
     */
    private boolean refreshing = false;

    /**
     * The ordered set of all seven days of a week,
     * beginning with the 'firstDayOfWeek'.
     */
    private int[] WEEK_DAYS;

    /**
     * Constructs a new date chooser panel, using today's date as the initial selection.
     */
    public DateChooserPanel() {
        this(Calendar.getInstance(), false);
    }

    /**
     * Constructs a new date chooser panel.
     *
     * @param calendar     the calendar controlling the date.
     * @param controlPanel a flag that indicates whether or not the 'today' button should
     *                     appear on the panel.
     */
    public DateChooserPanel(final Calendar calendar, final boolean controlPanel) {

        super(new BorderLayout());

        this.chosenDateButtonColor = UIManager.getColor("textHighlight");
        this.chosenMonthButtonColor = UIManager.getColor("control");
        this.chosenOtherButtonColor = UIManager.getColor("controlShadow");

        // the default date is today...
        this.chosenDate = calendar;
        this.firstDayOfWeek = calendar.getFirstDayOfWeek();
        this.WEEK_DAYS = new int[7];
        for (int i = 0; i < 7; i++) {
            this.WEEK_DAYS[i] = ((this.firstDayOfWeek + i - 1) % 7) + 1;
        }

        add(constructSelectionPanel(), BorderLayout.NORTH);
        add(getCalendarPanel(), BorderLayout.CENTER);
        if (controlPanel) {
            add(constructControlPanel(), BorderLayout.SOUTH);
        }
        setDate(calendar.getTime());
    }

    /**
     * Sets the date chosen in the panel.
     *
     * @param theDate the new date.
     */
    public void setDate(final Date theDate) {

        this.chosenDate.setTime(theDate);
        this.monthSelector.setSelectedIndex(this.chosenDate.get(Calendar.MONTH));
        refreshYearSelector();
        refreshButtons();

    }

    /**
     * Returns the date selected in the panel.
     *
     * @return the selected date.
     */
    public Date getDate() {
        return this.chosenDate.getTime();
    }

    /**
     * Handles action-events from the date panel.
     *
     * @param e information about the event that occurred.
     */
    public void actionPerformed(final ActionEvent e) {

        if (e.getActionCommand().equals("monthSelectionChanged")) {
            final JComboBox c = (JComboBox) e.getSource();
            this.chosenDate.set(Calendar.MONTH, c.getSelectedIndex());
            refreshButtons();
        }
        else if (e.getActionCommand().equals("yearSelectionChanged")) {
            if (!this.refreshing) {
                final JComboBox c = (JComboBox) e.getSource();
                final Integer y = (Integer) c.getSelectedItem();
                this.chosenDate.set(Calendar.YEAR, y.intValue());
                refreshYearSelector();
                refreshButtons();
            }
        }
        else if (e.getActionCommand().equals("todayButtonClicked")) {
            setDate(new Date());
        }
        else if (e.getActionCommand().equals("dateButtonClicked")) {
            final JButton b = (JButton) e.getSource();
            final int i = Integer.parseInt(b.getName());
            final Calendar cal = getFirstVisibleDate();
            cal.add(Calendar.DATE, i);
            setDate(cal.getTime());
        }
    }

    /**
     * Returns a panel of buttons, each button representing a day in the month.  This is a
     * sub-component of the DatePanel.
     *
     * @return the panel.
     */
    private JPanel getCalendarPanel() {

        final JPanel p = new JPanel(new GridLayout(7, 7));
        final DateFormatSymbols dateFormatSymbols = new DateFormatSymbols();
        final String[] weekDays = dateFormatSymbols.getShortWeekdays();

        for (int i = 0; i < this.WEEK_DAYS.length; i++) {
            p.add(new JLabel(weekDays[this.WEEK_DAYS[i]], SwingConstants.CENTER));
        }

        this.buttons = new JButton[42];
        for (int i = 0; i < 42; i++) {
            final JButton b = new JButton("");
            b.setMargin(new Insets(1, 1, 1, 1));
            b.setName(new Integer(i).toString());
            b.setFont(this.dateFont);
            b.setFocusPainted(false);
            b.setActionCommand("dateButtonClicked");
            b.addActionListener(this);