MenuTest.java Source code

Introduction

Here is the source code for MenuTest.java

Source

/*
   This program is a part of the companion code for Core Java 8th ed.
   (http://horstmann.com/corejava)
    
   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.
    
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
    
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;

import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.KeyStroke;

/**
 * @version 1.23 2007-05-30
 * @author Cay Horstmann
 */
public class MenuTest {
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                MenuFrame frame = new MenuFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
            }
        });
    }
}

/**
 * A frame with a sample menu bar.
 */
class MenuFrame extends JFrame {
    public MenuFrame() {
        setTitle("MenuTest");
        setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

        JMenu fileMenu = new JMenu("File");
        fileMenu.add(new TestAction("New"));

        // demonstrate accelerators

        JMenuItem openItem = fileMenu.add(new TestAction("Open"));
        openItem.setAccelerator(KeyStroke.getKeyStroke("ctrl O"));

        fileMenu.addSeparator();

        saveAction = new TestAction("Save");
        JMenuItem saveItem = fileMenu.add(saveAction);
        saveItem.setAccelerator(KeyStroke.getKeyStroke("ctrl S"));

        saveAsAction = new TestAction("Save As");
        fileMenu.add(saveAsAction);
        fileMenu.addSeparator();

        fileMenu.add(new AbstractAction("Exit") {
            public void actionPerformed(ActionEvent event) {
                System.exit(0);
            }
        });

        // demonstrate check box and radio button menus

        readonlyItem = new JCheckBoxMenuItem("Read-only");
        readonlyItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                boolean saveOk = !readonlyItem.isSelected();
                saveAction.setEnabled(saveOk);
                saveAsAction.setEnabled(saveOk);
            }
        });

        ButtonGroup group = new ButtonGroup();

        JRadioButtonMenuItem insertItem = new JRadioButtonMenuItem("Insert");
        insertItem.setSelected(true);
        JRadioButtonMenuItem overtypeItem = new JRadioButtonMenuItem("Overtype");

        group.add(insertItem);
        group.add(overtypeItem);

        // demonstrate icons

        Action cutAction = new TestAction("Cut");
        cutAction.putValue(Action.SMALL_ICON, new ImageIcon("cut.gif"));
        Action copyAction = new TestAction("Copy");
        copyAction.putValue(Action.SMALL_ICON, new ImageIcon("copy.gif"));
        Action pasteAction = new TestAction("Paste");
        pasteAction.putValue(Action.SMALL_ICON, new ImageIcon("paste.gif"));

        JMenu editMenu = new JMenu("Edit");
        editMenu.add(cutAction);
        editMenu.add(copyAction);
        editMenu.add(pasteAction);

        // demonstrate nested menus

        JMenu optionMenu = new JMenu("Options");

        optionMenu.add(readonlyItem);
        optionMenu.addSeparator();
        optionMenu.add(insertItem);
        optionMenu.add(overtypeItem);

        editMenu.addSeparator();
        editMenu.add(optionMenu);

        // demonstrate mnemonics

        JMenu helpMenu = new JMenu("Help");
        helpMenu.setMnemonic('H');

        JMenuItem indexItem = new JMenuItem("Index");
        indexItem.setMnemonic('I');
        helpMenu.add(indexItem);

        // you can also add the mnemonic key to an action
        Action aboutAction = new TestAction("About");
        aboutAction.putValue(Action.MNEMONIC_KEY, new Integer('A'));
        helpMenu.add(aboutAction);

        // add all top-level menus to menu bar

        JMenuBar menuBar = new JMenuBar();
        setJMenuBar(menuBar);

        menuBar.add(fileMenu);
        menuBar.add(editMenu);
        menuBar.add(helpMenu);

        // demonstrate pop-ups

        popup = new JPopupMenu();
        popup.add(cutAction);
        popup.add(copyAction);
        popup.add(pasteAction);

        JPanel panel = new JPanel();
        panel.setComponentPopupMenu(popup);
        add(panel);

        // the following line is a workaround for bug 4966109
        panel.addMouseListener(new MouseAdapter() {
        });
    }

    public static final int DEFAULT_WIDTH = 300;
    public static final int DEFAULT_HEIGHT = 200;

    private Action saveAction;
    private Action saveAsAction;
    private JCheckBoxMenuItem readonlyItem;
    private JPopupMenu popup;
}

/**
 * A sample action that prints the action name to System.out
 */
class TestAction extends AbstractAction {
    public TestAction(String name) {
        super(name);
    }

    public void actionPerformed(ActionEvent event) {
        System.out.println(getValue(Action.NAME) + " selected.");
    }
}