Why JWindow can not catch the KEY Type event?

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JTL.zheng - 04 May 2007 13:27 GMT

my code is:

JWindow window= new JWindow();
window.addKeyListener(new KeyListener() {
public void keyTyped(KeyEvent e) {
System.out.println((int) e.getKeyChar());
}
});

but it did not print any thing when I type the keyboard
(however, It can catch the mouse click event)

What should I do if I want to catch the KEY type event in JWindow?
Thank you very much.

Reply to this Message

Andrew Thompson - 04 May 2007 17:03 GMT

>JWindow window= new JWindow();

Somebody asked recently, what good
was a JWiindow, over an undecorated JFrame,
and apparently, *not* for..

>window.addKeyListener(new KeyListener() {

..KeyListener! I expect it has something to do with
being keyboard focusable - put a text field in it, and
that may change it.

OTOH..

>What should I do if I want to catch the KEY type event in JWindow?

What about something that 'looks just like it'?

<sscce>
import javax.swing.JFrame;
import java.awt.event.KeyListener;
import java.awt.event.KeyEvent;

public class TestFocus {

public static void main(String[] args) {

JFrame f = new JFrame();
f.setUndecorated(true);
f.addKeyListener(new KeyListener() {
public void keyTyped(KeyEvent e) {
System.out.println((int) e.getKeyChar());
}
public void keyReleased(KeyEvent e) {}
public void keyPressed(KeyEvent e) {}
});
System.out.println( "f.isFocusable() " + f.isFocusable() );
f.setSize(200,200);
f.setVisible(true);
}
}
</sscce>

HTH