Demonstrate Cascading Menus
/*
* Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
* cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
* pioneering role in inventing and promulgating (and standardizing) the Java
* language and environment is gratefully acknowledged.
*
* The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
* inventing predecessor languages C and C++ is also gratefully acknowledged.
*/
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
/**
* Demonstrate Cascading Menus for students of Learning Tree Course 471/478
*
* @author Ian Darwin
*/
public class MenuCascade extends JFrame {
JMenuBar mb;
JMenu fm, om, hm; // File, Options, Help
JMenu opSubm; // Options Sub-Menu
JMenuItem mi;
// Constructor
MenuCascade(String s) {
super("MenuCascade: " + s);
Container cp = getContentPane();
cp.setLayout(new FlowLayout());
mb = new JMenuBar();
setJMenuBar(mb);
// The File Menu...
fm = new JMenu("File");
fm.add(mi = new JMenuItem("Open"));
mi.addActionListener(defaultHandler);
fm.add(mi = new JMenuItem("Close"));
mi.addActionListener(defaultHandler);
fm.addSeparator();
fm.add(mi = new JMenuItem("Exit"));
mi.addActionListener(defaultHandler);
mi.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
mb.add(fm);
// The Options Menu...
om = new JMenu("Options");
opSubm = new JMenu("SubOptions");
opSubm.add(mi = new JMenuItem("Alpha"));
mi.addActionListener(defaultHandler);
opSubm.add(mi = new JMenuItem("Gamma"));
mi.addActionListener(defaultHandler);
opSubm.add(mi = new JMenuItem("Delta"));
mi.addActionListener(defaultHandler);
om.add(opSubm);
mb.add(om);
// The Help Menu...
hm = new JMenu("Help");
hm.add(mi = new JMenuItem("About"));
mi.addActionListener(defaultHandler);
mi.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(MenuCascade.this, "Version 0",
"Version 0", JOptionPane.INFORMATION_MESSAGE);
}
});
hm.add(mi = new JMenuItem("Topics"));
mi.addActionListener(defaultHandler);
mb.add(hm);
// the main window
// cp.add(new MyCanvas("Menu Demo Window", 200, 150));
pack();
}
ActionListener defaultHandler = new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.out.println("You chose " + e.getActionCommand());
}
};
public static void main(String[] arg) {
MenuCascade mb = new MenuCascade("Testing 1 2 3...");
mb.setVisible(true);
}
}
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