import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;

//Create a JPanel that handles a popup menu. Then use the JPanel as the
//contentPane for a JFrame.
public class PopupMenuExample extends JPanel implements ActionListener,
							PopupMenuListener {
    public JPopupMenu popup;
    
    public PopupMenuExample() {
        popup = new JPopupMenu(); //The popup menu object.
	
        //Assemble the popup menu. This is done exactly the same way as with a 
        //non-popup menu. Actually, a "normal" menu is implemented as a button
        //that displays a popup menu when pressed.
        JMenuItem item;
        popup.add(item = new JMenuItem("Left", new ImageIcon("left.gif")));
        //Place the text to the right of the icon. This will align the
        //icons properly.
        item.setHorizontalTextPosition(JMenuItem.RIGHT);
        item.addActionListener(this);
        popup.add(item = new JMenuItem("Center",
				       new ImageIcon("center.gif")));
        //Place the text to the right of the icon. This will align the
        //icons properly.
        item.setHorizontalTextPosition(JMenuItem.RIGHT);
        item.addActionListener(this);
        popup.add(item = new JMenuItem("Right", new
				       ImageIcon("right.gif")));
        //Place the text to the right of the icon. This will align the
        //icons properly.
        item.setHorizontalTextPosition(JMenuItem.RIGHT);
        item.addActionListener(this);
        popup.add(item = new JMenuItem("Full", new ImageIcon("full.gif")));
        //Place the text to the right of the icon. This will align the
        //icons properly.
        item.setHorizontalTextPosition(JMenuItem.RIGHT);
        item.addActionListener(this);
        popup.addSeparator();
        popup.add(item = new JMenuItem("Settings . . ."));
        item.addActionListener(this);
	
        popup.setLabel("Justification");
        //Set the popup menus border.
        popup.setBorder(new BevelBorder(BevelBorder.RAISED));
        //Listen for popup menus. This is not necessary.
        popup.addPopupMenuListener(this);
	
        //Display the popup menu when the mouse is released.
        addMouseListener(new MouseAdapter() {
		public void mouseReleased(MouseEvent e) {
		    //The mouse event method isPopupTrigger() returns true if
		    //this mouse event is this platforms popup trigger. For
		    //Windows the popup trigger is the right mouse button.
		    //Display the popup meny at the point where the mouse was released.
		    //It is better to use the show() method instead of setVisible(true).
		    //Normally, we do not have to take care of removing the popup menu. 
		    //This is handled by Swing.
		    if (e.isPopupTrigger()) 
			popup.show((Component)e.getSource(), e.getX(), e.getY());
		} 
	    });
	
    }
    
    public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
        System.out.println("Popup menu will be visible!");
    }
    
    public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
        System.out.println("Popup menu will be invisible!");
    }
    
    public void popupMenuCanceled(PopupMenuEvent e) {
        System.out.println("Popup menu is hidden!");
    }
    
    public void actionPerformed(ActionEvent event) {
        System.out.println("Popup menu item [" + event.getActionCommand() +
                           "] was pressed.");
    }
    
    public static void main(String s[]) {
        JFrame frame = new JFrame("Popup Menu Example");
        frame.addWindowListener(new WindowAdapter() {
		public void windowClosing(WindowEvent e) {  
		    System.exit(0);
		}
	    });
        frame.setContentPane(new PopupMenuExample());
        frame.setSize(300, 300);
        frame.setVisible(true);
    }
}