Mega Code Archive
A panel that allows the user to select a date
<![CDATA[
/*
* 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 1.11 2007/11/02 17:50:36 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);
*
*/
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;
/**
* 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));
}
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(Integer.toString(i));
b.setFont(this.dateFont);
b.setFocusPainted(false);
b.setActionCommand("dateButtonClicked");
b.addActionListener(this);
this.buttons[i] = b;
p.add(b);
}
return p;
}
/**
* Returns the button color according to the specified date.
*
* @param theDate the date.
* @return the color.
*/
private Color getButtonColor(final Calendar theDate) {
if (equalDates(theDate, this.chosenDate)) {
return this.chosenDateButtonColor;
}
else if (theDate.get(Calendar.MONTH) == this.chosenDate.get(
Calendar.MONTH)) {
return this.chosenMonthButtonColor;
}
else {
return this.chosenOtherButtonColor;
}
}
/**
* Returns true if the two dates are equal (time of day is ignored).
*
* @param c1 the first date.
* @param c2 the second date.
* @return boolean.
*/
private boolean equalDates(final Calendar c1, final Calendar c2) {
if ((c1.get(Calendar.DATE) == c2.get(Calendar.DATE))
&& (c1.get(Calendar.MONTH) == c2.get(Calendar.MONTH))
&& (c1.get(Calendar.YEAR) == c2.get(Calendar.YEAR))) {
return true;
}
else {
return false;
}
}
/**
* Returns the first date that is visible in the grid. This should always
* be in the month preceding the month of the selected date.
*
* @return the date.
*/
private Calendar getFirstVisibleDate() {
final Calendar c = Calendar.getInstance();
c.set(this.chosenDate.get(Calendar.YEAR), this.chosenDate.get(
Calendar.MONTH), 1);
c.add(Calendar.DATE, -1);
while (c.get(Calendar.DAY_OF_WEEK) != getFirstDayOfWeek()) {
c.add(Calendar.DATE, -1);
}
return c;
}
/**
* Returns the first day of the week (controls the labels in the date
* panel).
*
* @return the first day of the week.
*/
private int getFirstDayOfWeek() {
return this.firstDayOfWeek;
}
/**
* Update the button labels and colors to reflect date selection.
*/
private void refreshButtons() {
final Calendar c = getFirstVisibleDate();
for (int i = 0; i < 42; i++) {
final JButton b = this.buttons[i];
b.setText(Integer.toString(c.get(Calendar.DATE)));
b.setBackground(getButtonColor(c));
c.add(Calendar.DATE, 1);
}
}
/**
* Changes the contents of the year selection JComboBox to reflect the
* chosen date and the year range.
*/
private void refreshYearSelector() {
if (!this.refreshing) {
this.refreshing = true;
this.yearSelector.removeAllItems();
final Integer[] years = getYears(this.chosenDate.get(
Calendar.YEAR));
for (int i = 0; i < years.length; i++) {
this.yearSelector.addItem(years[i]);
}
this.yearSelector.setSelectedItem(new Integer(this.chosenDate.get(
Calendar.YEAR)));
this.refreshing = false;
}
}
/**
* Returns a vector of years preceding and following the specified year.
* The number of years preceding and following is determined by the
* yearSelectionRange attribute.
*
* @param chosenYear the selected year.
* @return a vector of years.
*/
private Integer[] getYears(final int chosenYear) {
final int size = this.yearSelectionRange * 2 + 1;
final int start = chosenYear - this.yearSelectionRange;
final Integer[] years = new Integer[size];
for (int i = 0; i < size; i++) {
years[i] = new Integer(i + start);
}
return years;
}
/**
* Constructs a panel containing two JComboBoxes (for the month and year)
* and a button (to reset the date to TODAY).
*
* @return the panel.
*/
private JPanel constructSelectionPanel() {
final JPanel p = new JPanel();
final int minMonth = this.chosenDate.getMinimum(Calendar.MONTH);
final int maxMonth = this.chosenDate.getMaximum(Calendar.MONTH);
final String[] months = new String[maxMonth - minMonth + 1];
for(int i=0;i<months.length;i++){
months[i] = ""+i;
}
this.monthSelector = new JComboBox(months);
this.monthSelector.addActionListener(this);
this.monthSelector.setActionCommand("monthSelectionChanged");
p.add(this.monthSelector);
this.yearSelector = new JComboBox(getYears(0));
this.yearSelector.addActionListener(this);
this.yearSelector.setActionCommand("yearSelectionChanged");
p.add(this.yearSelector);
return p;
}
/**
* Returns a panel that appears at the bottom of the calendar panel -
* contains a button for selecting today's date.
*
* @return the panel.
*/
private JPanel constructControlPanel() {
final JPanel p = new JPanel();
p.setBorder(BorderFactory.createEmptyBorder(2, 5, 2, 5));
this.todayButton = new JButton("Today");
this.todayButton.addActionListener(this);
this.todayButton.setActionCommand("todayButtonClicked");
p.add(this.todayButton);
return p;
}
/**
* Returns the color for the currently selected date.
*
* @return a color.
*/
public Color getChosenDateButtonColor() {
return this.chosenDateButtonColor;
}
/**
* Redefines the color for the currently selected date.
*
* @param chosenDateButtonColor the new color
*/
public void setChosenDateButtonColor(final Color chosenDateButtonColor) {
if (chosenDateButtonColor == null) {
throw new NullPointerException("UIColor must not be null.");
}
final Color oldValue = this.chosenDateButtonColor;
this.chosenDateButtonColor = chosenDateButtonColor;
refreshButtons();
firePropertyChange("chosenDateButtonColor", oldValue,
chosenDateButtonColor);
}
/**
* Returns the color for the buttons representing the current month.
*
* @return the color for the current month.
*/
public Color getChosenMonthButtonColor() {
return this.chosenMonthButtonColor;
}
/**
* Defines the color for the buttons representing the current month.
*
* @param chosenMonthButtonColor the color for the current month.
*/
public void setChosenMonthButtonColor(final Color chosenMonthButtonColor) {
if (chosenMonthButtonColor == null) {
throw new NullPointerException("UIColor must not be null.");
}
final Color oldValue = this.chosenMonthButtonColor;
this.chosenMonthButtonColor = chosenMonthButtonColor;
refreshButtons();
firePropertyChange("chosenMonthButtonColor", oldValue,
chosenMonthButtonColor);
}
/**
* Returns the color for the buttons representing the other months.
*
* @return a color.
*/
public Color getChosenOtherButtonColor() {
return this.chosenOtherButtonColor;
}
/**
* Redefines the color for the buttons representing the other months.
*
* @param chosenOtherButtonColor a color.
*/
public void setChosenOtherButtonColor(final Color chosenOtherButtonColor) {
if (chosenOtherButtonColor == null) {
throw new NullPointerException("UIColor must not be null.");
}
final Color oldValue = this.chosenOtherButtonColor;
this.chosenOtherButtonColor = chosenOtherButtonColor;
refreshButtons();
firePropertyChange("chosenOtherButtonColor", oldValue,
chosenOtherButtonColor);
}
/**
* Returns the range of years available for selection (defaults to 20).
*
* @return The range.
*/
public int getYearSelectionRange() {
return this.yearSelectionRange;
}
/**
* Sets the range of years available for selection.
*
* @param yearSelectionRange the range.
*/
public void setYearSelectionRange(final int yearSelectionRange) {
final int oldYearSelectionRange = this.yearSelectionRange;
this.yearSelectionRange = yearSelectionRange;
refreshYearSelector();
firePropertyChange("yearSelectionRange", oldYearSelectionRange,
yearSelectionRange);
}
}
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