Demonstrate Menus and the MenuBar class
/*
* 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
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* 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.CheckboxMenuItem;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.MenuShortcut;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
/**
* Demonstrate Menus and the MenuBar class/MenuContainer interface
*
* This version uses 1.1 action handling and MenuShortcut. The action handling
* is incomplete; realistically, each MenuItem would have its own, task-specific
* ActionListener; this would handle the MenuShortcuts and the CheckboxMenuItems
* correctly.
*
* @author Ian Darwin
*/
public class AnotherMenuDemo extends Frame implements ActionListener, ItemListener {
MenuBar mb;
/** File, Options, Help */
Menu fm, om, hm;
/** Options Sub-Menu */
Menu opSubm;
/** The MenuItem for exiting. */
MenuItem exitItem;
/** An option that can be on or off. */
CheckboxMenuItem cb;
// Constructor
AnotherMenuDemo(String s) {
super("MenuDemo: " + s);
Container cp = this;
cp.setLayout(new FlowLayout());
mb = new MenuBar();
setMenuBar(mb); // Frame implements MenuContainer
MenuItem mi;
// The File Menu...
fm = new Menu("File");
fm.add(mi = new MenuItem("Open", new MenuShortcut('O')));
mi.addActionListener(this);
fm.add(mi = new MenuItem("Close", new MenuShortcut('W')));
mi.addActionListener(this);
fm.addSeparator();
fm.add(mi = new MenuItem("Print", new MenuShortcut('P')));
mi.addActionListener(this);
fm.addSeparator();
fm.add(mi = new MenuItem("Exit", new MenuShortcut('Q')));
exitItem = mi; // save for action handler
mi.addActionListener(this);
mb.add(fm);
// The Options Menu...
om = new Menu("Options");
cb = new CheckboxMenuItem("AutoSave");
cb.setState(true);
cb.addItemListener(this);
om.add(cb);
opSubm = new Menu("SubOptions");
opSubm.add(new MenuItem("Alpha"));
opSubm.add(new MenuItem("Gamma"));
opSubm.add(new MenuItem("Delta"));
om.add(opSubm);
mb.add(om);
// The Help Menu...
hm = new Menu("Help");
hm.add(mi = new MenuItem("About"));
mi.addActionListener(this);
hm.add(mi = new MenuItem("Topics"));
mi.addActionListener(this);
mb.add(hm);
mb.setHelpMenu(hm); // needed for portability (Motif, etc.).
// the main window
cp.add(new Label("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);
}
/** The CheckBoxMenuItems send a different message */
public void itemStateChanged(ItemEvent e) {
System.out.println("AutoSave is set " + cb.getState());
}
public static void main(String[] arg) {
new MenuDemo("Testing 1 2 3...").setVisible(true);
}
}
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