I have been unable to get a JComboBox to report any Key/Focus Events to
listeners. I have checked the archives on the mailing list and the bug reports
and couldn't find the problem reported. I have encountered the problem in both
the Windows and Linux JVM's so I'm wondering at this point whether its my
problem or the JVM's problem. Can a JComboBox not have a Focus/Key
Listener? If not, Why not?
Anyway, here is a small sample code that demonstrates my problem.
When the JComboBox Gains/Loses Focus or has key pressed while its in focus you
should get a little message like:
Component 0 Lost Focus
Component 0 Gained Focus
Component 0 Key Pressed
Well, you get the idea.
-----------------------
import javax.swing.JFrame;
import javax.swing.JComboBox;
import javax.swing.JPanel;
import javax.swing.JTextField;
import java.awt.event.FocusListener;
import java.awt.event.FocusEvent;
import java.awt.event.KeyListener;
import java.awt.event.KeyEvent;
import java.awt.Component;
import java.awt.FlowLayout;
import java.util.Vector;
public class testClass extends JFrame implements FocusListener,
KeyListener
{
Vector
componentList = null;
public testClass()
{
JPanel panel = new JPanel(new FlowLayout());
componentList = new Vector();
componentList.addElement(new JComboBox());
componentList.addElement(new JTextField(10));
for (int i = 0; i < componentList.size(); i++)
{
((Component)componentList.elementAt(i)).addFocusListener(this);
((Component)componentList.elementAt(i)).addKeyListener(this);
panel.add((Component)componentList.elementAt(i));
}
this.getContentPane().add(panel);
setSize(320,200);
setVisible(true);
}
public void focusLost(FocusEvent e)
{
System.out.println("Component " +
componentList.indexOf(e.getSource()) + " Lost Focus");
}
public void focusGained(FocusEvent e)
{
System.out.println("Component " +
componentList.indexOf(e.getSource()) + " Gained Focus");
}
public void keyTyped(KeyEvent e)
{
System.out.println("Component " +
componentList.indexOf(e.getSource()) + " Key Typed");
}
public void keyPressed(KeyEvent e)
{
System.out.println("Component " +
componentList.indexOf(e.getSource()) + " Key Pressed");
}
public void keyReleased(KeyEvent e)
{
System.out.println("Component " +
componentList.indexOf(e.getSource()) + " Key Released");
}
public static void main(String args[])
{
testClass t = new testClass();
}
}
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