//: MenuNew.java
//////////////////////////////////////////////////
// Copyright (c) Bruce Eckel, 1998
// Source code file from the book "Thinking in Java"
// All rights reserved EXCEPT as allowed by the
// following statements: You can freely use this file
// for your own work (personal or commercial),
// including modifications and distribution in
// executable form only. Permission is granted to use
// this file in classroom situations, including its
// use in presentation materials, as long as the book
// "Thinking in Java" is cited as the source.
// Except in classroom situations, you cannot copy
// and distribute this code; instead, the sole
// distribution point is http://www.BruceEckel.com
// (and official mirror sites) where it is
// freely available. You cannot remove this
// copyright and notice. You cannot distribute
// modified versions of the source code in this
// package. You cannot use this file in printed
// media without the express permission of the
// author. Bruce Eckel makes no representation about
// the suitability of this software for any purpose.
// It is provided "as is" without express or implied
// warranty of any kind, including any implied
// warranty of merchantability, fitness for a
// particular purpose or non-infringement. The entire
// risk as to the quality and performance of the
// software is with you. Bruce Eckel and the
// publisher shall not be liable for any damages
// suffered by you or any third party as a result of
// using or distributing software. In no event will
// Bruce Eckel or the publisher be liable for any
// lost revenue, profit, or data, or for direct,
// indirect, special, consequential, incidental, or
// punitive damages, however caused and regardless of
// the theory of liability, arising out of the use of
// or inability to use software, even if Bruce Eckel
// and the publisher have been advised of the
// possibility of such damages. Should the software
// prove defective, you assume the cost of all
// necessary servicing, repair, or correction. If you
// think you've found an error, please email all
// modified files with clearly commented changes to:
// Bruce@EckelObjects.com. (Please use the same
// address for non-code errors found in the book.)
/////////////////////////////////////////////////
// Menus in Java 1.1
import java.awt.*;
import java.awt.event.*;
public class MenuNew extends Frame {
String[] flavors = { "Chocolate", "Strawberry",
"Vanilla Fudge Swirl", "Mint Chip",
"Mocha Almond Fudge", "Rum Raisin",
"Praline Cream", "Mud Pie" };
TextField t = new TextField("No flavor", 30);
MenuBar mb1 = new MenuBar();
Menu f = new Menu("File");
Menu m = new Menu("Flavors");
Menu s = new Menu("Safety");
// Alternative approach:
CheckboxMenuItem[] safety = {
new CheckboxMenuItem("Guard"),
new CheckboxMenuItem("Hide")
};
MenuItem[] file = {
// No menu shortcut:
new MenuItem("Open"),
// Adding a menu shortcut is very simple:
new MenuItem("Exit",
new MenuShortcut(KeyEvent.VK_E))
};
// A second menu bar to swap to:
MenuBar mb2 = new MenuBar();
Menu fooBar = new Menu("fooBar");
MenuItem[] other = {
new MenuItem("Foo"),
new MenuItem("Bar"),
new MenuItem("Baz"),
};
// Initialization code:
{
ML ml = new ML();
CMIL cmil = new CMIL();
safety[0].setActionCommand("Guard");
safety[0].addItemListener(cmil);
safety[1].setActionCommand("Hide");
safety[1].addItemListener(cmil);
file[0].setActionCommand("Open");
file[0].addActionListener(ml);
file[1].setActionCommand("Exit");
file[1].addActionListener(ml);
other[0].addActionListener(new FooL());
other[1].addActionListener(new BarL());
other[2].addActionListener(new BazL());
}
Button b = new Button("Swap Menus");
public MenuNew() {
FL fl = new FL();
for(int i = 0; i < flavors.length; i++) {
MenuItem mi = new MenuItem(flavors[i]);
mi.addActionListener(fl);
m.add(mi);
// Add separators at intervals:
if((i+1) % 3 == 0)
m.addSeparator();
}
for(int i = 0; i < safety.length; i++)
s.add(safety[i]);
f.add(s);
for(int i = 0; i < file.length; i++)
f.add(file[i]);
mb1.add(f);
mb1.add(m);
setMenuBar(mb1);
t.setEditable(false);
add(t, BorderLayout.CENTER);
// Set up the system for swapping menus:
b.addActionListener(new BL());
add(b, BorderLayout.NORTH);
for(int i = 0; i < other.length; i++)
fooBar.add(other[i]);
mb2.add(fooBar);
}
class BL implements ActionListener {
public void actionPerformed(ActionEvent e) {
MenuBar m = getMenuBar();
if(m == mb1) setMenuBar(mb2);
else if (m == mb2) setMenuBar(mb1);
}
}
class ML implements ActionListener {
public void actionPerformed(ActionEvent e) {
MenuItem target = (MenuItem)e.getSource();
String actionCommand =
target.getActionCommand();
if(actionCommand.equals("Open")) {
String s = t.getText();
boolean chosen = false;
for(int i = 0; i < flavors.length; i++)
if(s.equals(flavors[i])) chosen = true;
if(!chosen)
t.setText("Choose a flavor first!");
else
t.setText("Opening "+ s +". Mmm, mm!");
} else if(actionCommand.equals("Exit")) {
dispatchEvent(
new WindowEvent(MenuNew.this,
WindowEvent.WINDOW_CLOSING));
}
}
}
class FL implements ActionListener {
public void actionPerformed(ActionEvent e) {
MenuItem target = (MenuItem)e.getSource();
t.setText(target.getLabel());
}
}
// Alternatively, you can create a different
// class for each different MenuItem. Then you
// Don't have to figure out which one it is:
class FooL implements ActionListener {
public void actionPerformed(ActionEvent e) {
t.setText("Foo selected");
}
}
class BarL implements ActionListener {
public void actionPerformed(ActionEvent e) {
t.setText("Bar selected");
}
}
class BazL implements ActionListener {
public void actionPerformed(ActionEvent e) {
t.setText("Baz selected");
}
}
class CMIL implements ItemListener {
public void itemStateChanged(ItemEvent e) {
CheckboxMenuItem target =
(CheckboxMenuItem)e.getSource();
String actionCommand =
target.getActionCommand();
if(actionCommand.equals("Guard"))
t.setText("Guard the Ice Cream! " +
"Guarding is " + target.getState());
else if(actionCommand.equals("Hide"))
t.setText("Hide the Ice Cream! " +
"Is it cold? " + target.getState());
}
}
public static void main(String[] args) {
MenuNew f = new MenuNew();
f.addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
f.setSize(300,200);
f.setVisible(true);
}
} ///:~ |
