KeyboardFocusManager dispatches only one event while multiple are fired

Question

I'm writing the game Achtung die Kurve, or 'Zatacka' in Java.
It's in fullscreen and there are multiple players with their own controls.
Now, to catch the KeyEvents (controls) for each Player, the Player objects get created with the following line in the constructor:
KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(this);However, when multiple players are holding (KEY_PRESSED) different buttons at the same time, only the 'last' one gets processed.
The following example shows my point:
import java.awt.GridLayout;
import java.awt.KeyEventDispatcher;
import java.awt.KeyboardFocusManager;
import java.awt.event.KeyEvent;
import javax.swing.*;
public class main
    private static JTextArea txt;
    public static void main(String[] args)
        new main();
    public main()
        JFrame f = new JFrame();
        f.setSize(300, 700);
        f.setVisible(true);
        f.setDefaultCloseOperation(f.DISPOSE_ON_CLOSE);
        f.setLayout(new GridLayout());
        txt = new JTextArea();
        txt.setEditable(false);
        f.add(txt);
        Listener l1 = new Listener(KeyEvent.VK_Z);
        Listener l2 = new Listener(KeyEvent.VK_X);
    class Listener implements KeyEventDispatcher
        int ktlt;
        public Listener(int keyToListen)
            ktlt = keyToListen;
            KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(this);
        public boolean dispatchKeyEvent(KeyEvent e)
            if (e.getID() == e.KEY_PRESSED && e.getKeyCode() == ktlt)
                txt.append("" + ktlt + "\n");
                return true;
            return false;
    }}Try holding the 'z' and 'x' buttons at the same time (for a short period).
What you would expect is that the output will contain the key codes for both of the buttons, alternatively.
What you see, is that the textarea gets filled with only the 'last' key that is being pressed.
What am I doing wrong here?
Edited by: Tails on 12-jan-2009 21:22

Answer 1

Tails wrote:
That's kind of a problem as I am on Linux.As am I
KeyEvents are broken on linux: every key press action generates KEY_TYPED, KEY_RELEASED and KEY_PRESSED events at the same time, which means that's worthless...I got it to work for my purposes. What is the alternative?