Input map of components / overriding native key commands

Question

Hi, I am in the process of developing a game engine on the Java language and have basically hit a brick wall =D
As my application runs through a java.awt.Frame, I need to be able to disable all native commands of key-to-event mapping. For instance, when I press the Alt key, then press down, I don't want a little pop-up menu to display in the upper-left corner. Another example is that I don't want Alt-F4 to always close the window, etc.
I have played around with listeners, but listeners to nothing but allow me to do something more than the key was previously assigned to; they don't prevent anything.
So, any ideas? I have handled the problem in the past by overwriting actions in a JComponent's InputMap/ActionMap. But, as Components do not implement InputMap or ActionMap, I'm stuck like a rock in a hard place =D
(Swing is not as efficient for rendering as AWT is, so I can't migrate to a Swing-based GUI)
If anybody has any suggestions, please let me know =D
Thanks in advance
Alex

Answer 1

try this for your alt-F4
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
class Testing extends JFrame
  boolean isAltF4 = false;
  public Testing()
    setLocation(400,300);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    JPanel p = new JPanel(new GridLayout(2,1));
    p.add(new JTextField(10));
    p.add(new JButton("OK"));
    getContentPane().add(p);
    pack();
    KeyboardFocusManager.getCurrentKeyboardFocusManager()
      .addKeyEventDispatcher(new KeyEventDispatcher(){
        public boolean dispatchKeyEvent(KeyEvent ke){
          if(ke.getID()==KeyEvent.KEY_PRESSED && ke.getKeyCode() == KeyEvent.VK_F4 && ke.isAltDown())
            isAltF4 = true;
            ke.consume();
          if(ke.getID()==KeyEvent.KEY_TYPED && isAltF4) ke.consume();
          if(ke.getID()==KeyEvent.KEY_RELEASED) isAltF4 = false;
        return false;}});
  public static void main(String[] args){new Testing().setVisible(true);}
}