JComboBox Lost Listener on Look and Feel change
When the user change the Look And Feel on the Fly , any Listener that is done using
myComboBox.getEditor().getEditorComponent().addXXXListener
is lost
I'm using Windows XP Service Pack 2, java 6 build 105
Does someone have any inputs why this happen or how this can be "fixed" or maybe prevent. Do I'm doing something wrong?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.util.*;
import java.text.SimpleDateFormat;
/* ComboBoxDemo2.java requires no other files. */
publicclass ComboBoxDemo2extends JPanel
implements ActionListener{
static JFrame frame;
JLabel result;
String currentPattern;
public ComboBoxDemo2(){
setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
String[] patternExamples ={
"dd MMMMM yyyy",
"dd.MM.yy",
"MM/dd/yy",
"yyyy.MM.dd G 'at' hh:mm:ss z",
"EEE, MMM d, ''yy",
"h:mm a",
"H:mm:ss:SSS",
"K:mm a,z",
"yyyy.MMMMM.dd GGG hh:mm aaa"
};
currentPattern = patternExamples[0];
//Set up the UI for selecting a pattern.
JLabel patternLabel1 =new JLabel("Enter the pattern string or");
JLabel patternLabel2 =new JLabel("select one from the list:");
JComboBox patternList =new JComboBox(patternExamples);
patternList.setEditable(true);
patternList.addActionListener(this);
//-- XXX
//This KeyListener it is lost when the user change the theme on the fly
patternList.getEditor().getEditorComponent().addKeyListener(new KeyAdapter()
{
publicvoid keyPressed(KeyEvent e)
{
System.out.println(" Key pressed is "+e.getKeyCode());
}});
//
//Create the UI for displaying result.
JLabel resultLabel =new JLabel("Current Date/Time",
JLabel.LEADING);//== LEFT
result =new JLabel(" ");
result.setForeground(Color.black);
result.setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createLineBorder(Color.black),
BorderFactory.createEmptyBorder(5,5,5,5)
));
//Lay out everything.
JPanel patternPanel =new JPanel();
patternPanel.setLayout(new BoxLayout(patternPanel,
BoxLayout.PAGE_AXIS));
patternPanel.add(patternLabel1);
patternPanel.add(patternLabel2);
patternList.setAlignmentX(Component.LEFT_ALIGNMENT);
patternPanel.add(patternList);
JPanel resultPanel =new JPanel(new GridLayout(0, 1));
resultPanel.add(resultLabel);
resultPanel.add(result);
patternPanel.setAlignmentX(Component.LEFT_ALIGNMENT);
resultPanel.setAlignmentX(Component.LEFT_ALIGNMENT);
add(patternPanel);
add(Box.createRigidArea(new Dimension(0, 10)));
add(resultPanel);
setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
reformat();
}//constructor
publicvoid actionPerformed(ActionEvent e){
System.out.println("Action Event");
JComboBox cb = (JComboBox)e.getSource();
String newSelection = (String)cb.getSelectedItem();
currentPattern = newSelection;
reformat();
}
/** Formats and displays today's date. */
publicvoid reformat(){
try{
Date today =new Date();
SimpleDateFormat formatter =
new SimpleDateFormat(currentPattern);
String dateString = formatter.format(today);
result.setForeground(Color.black);
result.setText(dateString);
}catch (IllegalArgumentException iae){
System.out.println("Ilegal argument Exception");
}
catch (Exception e){
System.out.println("Argument Exception");
}
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event-dispatching thread.
*/
privatestaticvoid createAndShowGUI(){
//Create and set up the window.
final JFrame frame =new JFrame("ComboBoxDemo2");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
JComponent newContentPane =new ComboBoxDemo2();
newContentPane.setOpaque(true);//content panes must be opaque
frame.setLayout(new BorderLayout());
//frame.setContentPane(newContentPane,BorderLayout.CENTER);
JMenuBar menuBar =new JMenuBar();
JMenu theme =new JMenu("Theme");
ButtonGroup bttnGroup =new ButtonGroup();
JCheckBoxMenuItem metal =new JCheckBoxMenuItem("Metal");
bttnGroup.add(metal);
metal.addActionListener(new ActionListener(){
publicvoid actionPerformed(ActionEvent e){
try{
UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
SwingUtilities.updateComponentTreeUI(frame);
}catch(Exception a){a.printStackTrace();}
}
});
theme.add(metal);
JCheckBoxMenuItem system =new JCheckBoxMenuItem("System");
bttnGroup.add(system);
system.addActionListener(new ActionListener(){
publicvoid actionPerformed(ActionEvent e){
try{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
SwingUtilities.updateComponentTreeUI(frame);
}catch(Exception a){a.printStackTrace();}
}
});
theme.add(system);
menuBar.add(theme);
frame.setJMenuBar(menuBar);
JToolBar jtb =new JToolBar();
jtb.add(newContentPane);
frame.add(jtb, BorderLayout.PAGE_START);
//Display the window.
frame.pack();
frame.setVisible(true);
}
publicstaticvoid main(String[] args){
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable(){
publicvoid run(){
createAndShowGUI();
}
});
}
}
