datechooserpanel.java

该源代码为一些通用的程序

/* ========================================================================
 * JCommon : a free general purpose class library for the Java(tm) platform
 * ========================================================================
 *
 * (C) Copyright 2000-2005, 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * 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 1.10 2005/11/16 15:58:41 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);
 * 02-Nov-2005 : Fixed a bug where the current day-of-the-month is past
 *               the end of the newly selected month when the month or year
 *               combo boxes are changed - see bug id 1344319 (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();
            
            // In most cases, changing the month will not change the selected
            // day.  But if the selected day is 29, 30 or 31 and the newly
            // selected month doesn't have that many days, we revert to the 
            // last day of the newly selected month...
            int dayOfMonth = this.chosenDate.get(Calendar.DAY_OF_MONTH);
            this.chosenDate.set(Calendar.DAY_OF_MONTH, 1);
            this.chosenDate.set(Calendar.MONTH, c.getSelectedIndex());
            int maxDayOfMonth = this.chosenDate.getActualMaximum(
                    Calendar.DAY_OF_MONTH);
            this.chosenDate.set(Calendar.DAY_OF_MONTH, Math.min(dayOfMonth, 
                    maxDayOfMonth));
            refreshButtons();
        }
        else if (e.getActionCommand().equals("yearSelectionChanged")) {
            if (!this.refreshing) {
                final JComboBox c = (JComboBox) e.getSource();
                final Integer y = (Integer) c.getSelectedItem();
                
                // in most cases, changing the year will not change the 
                // selected day.  But if the selected day is Feb 29, and the
                // newly selected year is not a leap year, we revert to 
                // Feb 28...
                int dayOfMonth = this.chosenDate.get(Calendar.DAY_OF_MONTH);
                this.chosenDate.set(Calendar.DAY_OF_MONTH, 1);
                this.chosenDate.set(Calendar.YEAR, y.intValue());
                int maxDayOfMonth = this.chosenDate.getActualMaximum(
                    Calendar.DAY_OF_MONTH);
                this.chosenDate.set(Calendar.DAY_OF_MONTH, Math.min(dayOfMonth, 
                    maxDayOfMonth));
                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));