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Java Source | 2000-05-25 | 7.0 KB | 204 lines |
- //: 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);
- }
- } ///:~