import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class KontextMenu implements MouseListener {

    public KontextMenu() {
        init();
    }
    
    private void init() {
        JFrame frame = new JFrame("Kontextmenu");
        frame.addMouseListener(this);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 200);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private void setMenu(MouseEvent event) {
        if (event.isPopupTrigger()) {
            new Popup((JFrame)event.getSource(), event);
        }
    }

    public void mouseClicked(MouseEvent event) {}

    public void mouseEntered(MouseEvent event) {}

    public void mouseExited(MouseEvent event) {}
    
    public void mouseReleased(MouseEvent event) {}

    public void mousePressed(MouseEvent event) {
        setMenu(event);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> new KontextMenu());
    }
}