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

/**
 * Demonstrate JMenu shortcuts and accelerators.
 *
 * @author Ian Darwin, http://www.darwinsys.com/
 * @version $Id: MenuShortcuts.java,v 1.4 2004/02/09 03:33:50 ian Exp $
 */
public class MenuShortcuts extends JFrame implements ActionListener {
	/** The menubar */
	JMenuBar mb;
	/** File, Options, Help */
	JMenu fm, om, hm;
	/** Options Sub-JMenu */
	JMenu opSubm;
	/** The JMenuItem for exiting. */
	JMenuItem exitItem;

	// Constructor
	MenuShortcuts(String s) {
		super("JMenuShortcuts: " + s);
		mb = new JMenuBar();
		setJMenuBar(mb);		// Frame implements JMenuContainer

		Container cp = getContentPane();
		JMenuItem mi;
		// The File JMenu...
		fm = new JMenu("File");
		fm.setMnemonic('F');
			fm.add(mi = new JMenuItem("Open", 'O'));
			mi.addActionListener(this);
			fm.add(mi = new JMenuItem("Close", 'W'));
			mi.addActionListener(this);
			fm.addSeparator();

			fm.add(mi = new JMenuItem("Print", 'P'));
			mi.setAccelerator(KeyStroke.getKeyStroke(
				KeyEvent.VK_R, Event.ALT_MASK));

			mi.addActionListener(this);
			fm.addSeparator();
			fm.add(mi = new JMenuItem("Exit", 'Q'));
			exitItem = mi;			// save for action handler
			mi.addActionListener(this);
		mb.add(fm);

		// The Options JMenu...
		om = new JMenu("Options");
			om.add(new JMenuItem("Alpha"));
			om.add(new JMenuItem("Gamma"));
			om.add(new JMenuItem("Delta"));
		mb.add(om);

		// The Help JMenu...
		hm = new JMenu("Help");
			hm.add(mi = new JMenuItem("About"));
			mi.addActionListener(this);
			hm.add(mi = new JMenuItem("Topics"));
			mi.addActionListener(this);
		mb.add(hm);
		// mb.setHelpMenu(hm);	// needed for portability (Motif, etc.).

		// the main window
		cp.add(new MyLabel("Menu Demo Window", 200, 150));
		pack();
	}

	/** Handle action events. */
	public void actionPerformed(ActionEvent evt) {
		// System.out.println("Event " + evt);
		String cmd;
		if ((cmd = evt.getActionCommand()) == null)
			System.out.println("You chose a menu shortcut");
		else
			System.out.println("You chose " + cmd);
		Object cmp = evt.getSource();
		// System.out.println("Source " + cmp);
		if (cmp == exitItem)
			System.exit(0);
	}

	public static void main(String[] arg) {
		new MenuShortcuts("Testing 1 2 3...").setVisible(true);
	}
}