java multi keystroke

Saa vidt jeg ved kan man ikke teste paa ALT+M+U men du kan teste paa ALT+M og ALT+U. Og saa maa du definere at ALT+M efterfulgt af ALT+U eller ALT+U efterfulgt af ALT+M goer det du vil.

Kommet videre ?

kan du give et kode eksempel,  jeg forstår det i teorien, men ik hvordan det skal kodes.

Jeg kan proeve og bixe noget senere.

Simpel demo:

package august;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;

import javax.swing.AbstractAction;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;

public class MultiKeys extends JFrame {
    private final static int WAITING_ALTM = 1;
    private final static int WAITING_ALTU = 2;
    private JPanel p;
    private int state;
    public MultiKeys() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        getContentPane().setLayout(new BorderLayout());
        setTitle("Multi key demo");
        p = new JPanel();
        p.add(new JLabel("Press ALT/M and ALT/U"));
        p.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(KeyEvent.VK_M ,InputEvent.ALT_DOWN_MASK), "_ALTM");
        p.getActionMap().put("_ALTM", new AbstractAction(){
            public void actionPerformed(ActionEvent ae){
                if(state == WAITING_ALTM) {
                    JOptionPane.showMessageDialog(null, "ALT/M pressed");
                    state = WAITING_ALTU;
                } else {
                    JOptionPane.showMessageDialog(null, "Press ALT/U !!!!");
                }
            }
        });
        p.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(KeyEvent.VK_U ,InputEvent.ALT_DOWN_MASK), "_ALTU");
        p.getActionMap().put("_ALTU", new AbstractAction(){
            public void actionPerformed(ActionEvent ae){
                if(state == WAITING_ALTU) {
                    JOptionPane.showMessageDialog(null, "ALT/U pressed");
                    state = WAITING_ALTM;
                } else {
                    JOptionPane.showMessageDialog(null, "Press ALT/M !!!!");
                }
            }
        });
        getContentPane().add(p, BorderLayout.CENTER);
        setSize(600, 400);
        state = WAITING_ALTM;
    }
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JFrame f = new MultiKeys();
                f.setVisible(true);
            }
        });
    }
}

tak, smid et svar

svar