Hello,
I cannot get my JPanel within my JApplet to receive keyboard events. I CANNOT FATHOM why!
Note that...
Clicking the panel (with mouse) before typing makes no difference. This is by far the most common advice I see given on the Net.
I have tried using the 'low-level' java.awt.KeyEventDispatcher interface. That makes no different either!
However, if I use Applet instead of JApplet, then the Applet DOES receive keyboard events. But even here, the moment I add a Panel to this Applet (the Panel is really where all my app/painting logic is), I once again stop receiving kb events (in my Panel)!
Now, I cannot simply use Applet (instead of JApplet) because, among other things, its onPaint gets a Graphics (instead of a Graphics2D object). So, #3 is NOT a solution for me.
Things work like a charm in AppletViewer that comes with JDK.
I desperately need someone's help here. Spent last 2-3 days trying all kinds of permutations I don't even recall now.
My platform details:
Firefox 3.5.3
Fedora 11 on x86 (with latest updates/patches)
Java Plugin: tried both of these, made no difference.
3.1 IcedTea Java Web Browser Plugin 1.6 (fedora-29.b16.fc11-i386)
3.2 jdk1.6.0_16/jre/plugin/i386/ns7/libjavaplugin_oji.so
Used the above jdk1.6.0_16 to compile my applet source.
Here's my code. Will greatly appreciate to hear from my fellow programmers... as I'm completely stuck!
Thanks,
/SD
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;
class MyAppletKeyListener implements KeyListener, MouseListener {
public void keyPressed(KeyEvent e) {
System.out.println("panel:keyPressed" + e.getKeyChar());
}
public void keyReleased(KeyEvent e) {
}
public void keyTyped(KeyEvent e) {
System.out.println("panel:keyTyped" + e.getKeyChar());
}
public void mouseClicked(MouseEvent e) {
System.out.println("panel:mouseClicked");
}
public void mouseEntered(MouseEvent e) { }
public void mouseExited(MouseEvent e) { }
public void mousePressed(MouseEvent e) { }
public void mouseReleased(MouseEvent e) { }
}
public class TestApplet extends JApplet implements MouseListener {
public void init() {
System.out.println("applet:init");
MyAppletKeyListener listener = new MyAppletKeyListener();
// Panel related
// Note: I'd like this red panel to handle
// all my keyboard and mouse events.
JPanel panel = new JPanel();
panel.setLayout(new FlowLayout());
panel.add(new JButton("test"));
panel.add(new JButton("test2"));
panel.setFocusable(true);
panel.requestFocus();
panel.setBackground(new Color(200, 0, 0));
panel.addKeyListener(listener);
panel.addMouseListener(listener);
// applet related
// Note: Added this only for debugging. I do NOT want
// to handle my mouse/kb events in the applet.
addMouseListener(this);
getContentPane().setLayout(new FlowLayout());
getContentPane().add(panel);
}
public void mouseClicked(MouseEvent e) {
System.out.println("applet:mouseClicked");
}
public void mouseEntered(MouseEvent e) { }
public void mouseExited(MouseEvent e) { }
public void mousePressed(MouseEvent e) { }
public void mouseReleased(MouseEvent e) { }
}
The HTML:
<html>
<head>
</head>
<body>
<applet id="myApplet" code="TestApplet.class"
width="425"
height="150" >
</applet>
</body>
</html>