Hi there,
you can use the code below (I added some functionality to it)
Problem: Once you set a date (its a comboBox)- you can't have it blank :-(
Solution: I use it with a jbutton to setIndex -1
i think you can get some better calander - but this one works just fine for me.
Best of luck
import java.awt.*;
import java.awt.event.*;
import java.util.Calendar;
import java.text.SimpleDateFormat;
import javax.swing.*;
import javax.swing.event.PopupMenuListener;
import javax.swing.event.PopupMenuEvent;
import javax.swing.plaf.ComboBoxUI;
import javax.swing.plaf.basic.ComboPopup;
import javax.swing.plaf.metal.MetalComboBoxUI;
import javax.swing.border.Border;
import javax.swing.border.EtchedBorder;
import javax.swing.border.EmptyBorder;
import com.sun.java.swing.plaf.motif.MotifComboBoxUI;
import com.sun.java.swing.plaf.windows.WindowsComboBoxUI;
public class DateComboBox extends JComboBox
{
protected SimpleDateFormat dateFormat = new SimpleDateFormat("dd-MMM-yy");
public void setDateFormat(SimpleDateFormat dateFormat)
{
this.dateFormat = dateFormat;
}
public void setSelectedItem(Object item)
{
// Could put extra logic here or in renderer when item is instanceof Date, Calendar, or
String // Dont keep a list ... just the currently selected item
removeAllItems(); // hides the popup if visible
addItem(item);
super.setSelectedItem(item);
}
public String getTodaysDate()
{
Calendar today = Calendar.getInstance();
return dateFormat.format(today.getTime());
}
public void updateUI()
{
ComboBoxUI cui = (ComboBoxUI) UIManager.getUI(this);
if (cui instanceof MetalComboBoxUI)
{
cui = new MetalDateComboBoxUI();
}
else if (cui instanceof MotifComboBoxUI)
{
cui = new MotifDateComboBoxUI();
}
else if (cui instanceof WindowsComboBoxUI)
{
cui = new WindowsDateComboBoxUI();
}
setUI(cui);
}
public boolean isBefore(DateComboBox someDay)
{
//check if the day1 came before day2
//initializing
Calendar a = Calendar.getInstance();
Calendar b = Calendar.getInstance();
try{
a.setTime( dateFormat.parse( someDay.getSelectedItem().toString() ) );
b.setTime( dateFormat.parse( this.getSelectedItem().toString() ) );
if (a.before(b))
return true;
else
return false;
}catch(Exception e)
{
//JOptionPane.showMessageDialog (this, "Date Conflict.", "Error Message", JOptionPane.ERROR_MESSAGE);
}
return false;
}
public boolean isBeforeOrSame(DateComboBox someDay)
{
Calendar a = Calendar.getInstance();
Calendar b = Calendar.getInstance();
try{
a.setTime( dateFormat.parse( someDay.getSelectedItem().toString() ) );
b.setTime( dateFormat.parse( this.getSelectedItem().toString() ) );
if (a.equals(b))
return true;
else if (a.before(b))
return true;
else
return false;
}catch(Exception e)
{
JOptionPane.showMessageDialog (this, "Date Conflict.", "Error Message", JOptionPane.ERROR_MESSAGE);
}
return false;
}
// Inner classes are used purely to keep DateComboBox component in one file
//////////////////////////////////////////////////////////////
// UI Inner classes -- one for each supported Look and Feel
//////////////////////////////////////////////////////////////
class MetalDateComboBoxUI extends MetalComboBoxUI
{
protected ComboPopup createPopup()
{
return new DatePopup( comboBox );
}
}
class WindowsDateComboBoxUI extends WindowsComboBoxUI
{
protected ComboPopup createPopup()
{
return new DatePopup( comboBox );
}
}
class MotifDateComboBoxUI extends MotifComboBoxUI
{
protected ComboPopup createPopup()
{
return new DatePopup( comboBox );
}
}
//////////////////////////////////////////////////////////////
// DatePopup inner class
//////////////////////////////////////////////////////////////
class DatePopup implements ComboPopup, MouseMotionListener,
MouseListener, KeyListener, PopupMenuListener {
protected JComboBox comboBox;
protected Calendar calendar;
protected JPopupMenu popup;
protected JLabel monthLabel;
protected JPanel days = null;
protected SimpleDateFormat monthFormat = new SimpleDateFormat("MMM yyyy");
protected Color selectedBackground;
protected Color selectedForeground;
protected Color background;
protected Color foreground;
public DatePopup(JComboBox comboBox) {
this.comboBox = comboBox;
calendar = Calendar.getInstance();
// check Look and Feel
background = UIManager.getColor("ComboBox.background");
foreground = UIManager.getColor("ComboBox.foreground");
selectedBackground = UIManager.getColor("ComboBox.selectionBackground");
selectedForeground = UIManager.getColor("ComboBox.selectionForeground");
initializePopup();
}
//========================================
// begin ComboPopup method implementations
//
public void show()
{
try {
// if setSelectedItem() was called with a valid date, adjust the calendar
calendar.setTime( dateFormat.parse( comboBox.getSelectedItem().toString() ) );
} catch (Exception e) {}
updatePopup();
popup.show(comboBox, 0, comboBox.getHeight());
}
public void hide()
{
popup.setVisible(false);
}
protected JList list = new JList();
public JList getList()
{
return list;
}
public MouseListener getMouseListener()
{
return this;
}
public MouseMotionListener getMouseMotionListener()
{
return this;
}
public KeyListener getKeyListener()
{
return this;
}
public boolean isVisible()
{
return popup.isVisible();
}
public void uninstallingUI()
{
popup.removePopupMenuListener(this);
}
//
// end ComboPopup method implementations
//======================================
//===================================================================
// begin Event Listeners
//
// MouseListener
public void mousePressed( MouseEvent e ) {}
public void mouseReleased( MouseEvent e ) {}
// something else registered for MousePressed
public void mouseClicked(MouseEvent e)
{
if ( !SwingUtilities.isLeftMouseButton(e) )
return;
if ( !comboBox.isEnabled() )
return;
if ( comboBox.isEditable() ) {
comboBox.getEditor().getEditorComponent().requestFocus();
} else {
comboBox.requestFocus();
}
togglePopup();
}
protected boolean mouseInside = false;
public void mouseEntered(MouseEvent e) {
mouseInside = true;
}
public void mouseExited(MouseEvent e) {
mouseInside = false;
}
// MouseMotionListener
public void mouseDragged(MouseEvent e) {}
public void mouseMoved(MouseEvent e) {}
// KeyListener
public void keyPressed(KeyEvent e) {}
public void keyTyped(KeyEvent e) {}
public void keyReleased( KeyEvent e ) {
if ( e.getKeyCode() == KeyEvent.VK_SPACE ||
e.getKeyCode() == KeyEvent.VK_ENTER ) {
togglePopup();
}
}
/**
* Variables hideNext and mouseInside are used to
* hide the popupMenu by clicking the mouse in the JComboBox
*/
public void popupMenuCanceled(PopupMenuEvent e) {}
protected boolean hideNext = false;
public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
hideNext = mouseInside;
}
public void popupMenuWillBecomeVisible(PopupMenuEvent e) {}
//
// end Event Listeners
//=================================================================
//===================================================================
// begin Utility methods
//
protected void togglePopup() {
if ( isVisible() || hideNext ) {
hide();
} else {
show();
}
hideNext = false;
}
//
// end Utility methods
//=================================================================
// Note *** did not use JButton because Popup closes when pressed
protected JLabel createUpdateButton(final int field, final int amount)
{
final JLabel label = new JLabel();
final Border selectedBorder = new EtchedBorder();
final Border unselectedBorder = new EmptyBorder(selectedBorder.getBorderInsets(new JLabel()));
label.setBorder(unselectedBorder);
label.setForeground(foreground);
label.addMouseListener(new MouseAdapter()
{
public void mouseReleased(MouseEvent e)
{
calendar.add(field, amount);
updatePopup();
}
public void mouseEntered(MouseEvent e)
{
label.setBorder(selectedBorder);
}
public void mouseExited(MouseEvent e)
{
label.setBorder(unselectedBorder);
}
});
return label;
}
protected void initializePopup() {
JPanel header = new JPanel(); // used Box, but it wasn't Opaque
header.setLayout(new BoxLayout(header, BoxLayout.X_AXIS));
header.setBackground(Color.getHSBColor(0.6f, 0.2f, 0.89f));
header.setOpaque(true);
JLabel label;
label = createUpdateButton(Calendar.YEAR, -1);
label.setText("<<");
label.setToolTipText("Previous Year");
header.add(Box.createHorizontalStrut(12));
header.add(label);
header.add(Box.createHorizontalStrut(12));
label = createUpdateButton(Calendar.MONTH, -1);
label.setText("<");
label.setToolTipText("Previous Month");
header.add(label);
monthLabel = new JLabel("", JLabel.CENTER);
monthLabel.setForeground(foreground);
header.add(Box.createHorizontalGlue());
header.add(monthLabel);
header.add(Box.createHorizontalGlue());
label = createUpdateButton(Calendar.MONTH, 1);
label.setText(">");
label.setToolTipText("Next Month");
header.add(label);
label = createUpdateButton(Calendar.YEAR, 1);
label.setText(">>");
label.setToolTipText("Next Year");
header.add(Box.createHorizontalStrut(12));
header.add(label);
header.add(Box.createHorizontalStrut(12));
popup = new JPopupMenu();
popup.setBorder(BorderFactory.createLineBorder(Color.black));
popup.setLayout(new BorderLayout());
popup.setBackground(background);
popup.addPopupMenuListener(this);
popup.add(BorderLayout.NORTH, header);
}
// update the Popup when either the month or the year of the calendar has been changed
protected void updatePopup() {
monthLabel.setText( monthFormat.format(calendar.getTime()) );
if (days != null) {
popup.remove(days);
}
days = new JPanel(new GridLayout(0, 7));
days.setBackground(Color.getHSBColor(0.6f, 0.2f, 0.89f));
days.setOpaque(true);
Calendar setupCalendar = (Calendar) calendar.clone();
setupCalendar.set(Calendar.DAY_OF_WEEK, setupCalendar.getFirstDayOfWeek());
for (int i = 0; i < 7; i++) {
int dayInt = setupCalendar.get(Calendar.DAY_OF_WEEK);
JLabel label = new JLabel();
label.setHorizontalAlignment(JLabel.CENTER);
label.setForeground(foreground);
if (dayInt == Calendar.SUNDAY) {
label.setText("Sun");
} else if (dayInt == Calendar.MONDAY) {
label.setText("Mon");
} else if (dayInt == Calendar.TUESDAY) {
label.setText("Tue");
} else if (dayInt == Calendar.WEDNESDAY) {
label.setText("Wed");
} else if (dayInt == Calendar.THURSDAY) {
label.setText("Thu");
} else if (dayInt == Calendar.FRIDAY) {
label.setText("Fri");
} else if (dayInt == Calendar.SATURDAY){
label.setText("Sat");
}
days.add(label);
setupCalendar.roll(Calendar.DAY_OF_WEEK, true);
}
setupCalendar = (Calendar) calendar.clone();
setupCalendar.set(Calendar.DAY_OF_MONTH, 1);
int first = setupCalendar.get(Calendar.DAY_OF_WEEK);
for (int i = 0; i < (first - 1); i++) {
days.add(new JLabel(""));
}
for (int i = 1; i <= setupCalendar.getActualMaximum(Calendar.DAY_OF_MONTH); i++) {
final int day = i;
final JLabel label = new JLabel(String.valueOf(day));
label.setHorizontalAlignment(JLabel.CENTER);
label.setForeground(foreground);
label.addMouseListener(new MouseListener() {
public void mousePressed(MouseEvent e) {}
public void mouseClicked(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {
label.setOpaque(false);
label.setBackground(background);
label.setForeground(foreground);
calendar.set(Calendar.DAY_OF_MONTH, day);
comboBox.setSelectedItem(dateFormat.format(calendar.getTime()));
hide();
// hide is called with setSelectedItem() ... removeAll()
comboBox.requestFocus();
}
public void mouseEntered(MouseEvent e) {
label.setOpaque(true);
label.setBackground(selectedBackground);
label.setForeground(selectedForeground);
}
public void mouseExited(MouseEvent e) {
label.setOpaque(false);
label.setBackground(background);
label.setForeground(foreground);
}
});
days.add(label);
}
popup.add(BorderLayout.CENTER, days);
popup.pack();
}
}
}