MenuDemo.java Source code

Introduction

Here is the source code for MenuDemo.java

Source

import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.io.File;

import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JRadioButtonMenuItem;

public class MenuDemo extends JFrame {

    public static final String FontNames[] = { "Serif", "SansSerif", "Courier" };

    protected Font fontArray[];

    protected JMenuItem[] menus;

    protected JCheckBoxMenuItem boldMenuItem;

    protected JCheckBoxMenuItem italicMenuItem;

    protected JFileChooser fileChooser;

    public MenuDemo() {
        super("Basic text editor");
        setSize(450, 350);

        fontArray = new Font[FontNames.length];
        for (int i = 0; i < FontNames.length; i++)
            fontArray[i] = new Font(FontNames[i], Font.PLAIN, 12);

        JMenuBar menuBar = createMenuBar();
        setJMenuBar(menuBar);

        fileChooser = new JFileChooser();
        fileChooser.setCurrentDirectory(new File("."));

        WindowListener exitEvent = new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        };
        addWindowListener(exitEvent);

        updateMonitor();
        setVisible(true);
    }

    protected JMenuBar createMenuBar() {
        final JMenuBar menuBar = new JMenuBar();

        JMenu menuFile = new JMenu("File");
        menuFile.setMnemonic('f');

        JMenuItem menuItem = new JMenuItem("New");
        menuItem.setIcon(new ImageIcon("file_new.gif"));
        menuItem.setMnemonic('n');
        ActionListener lst = new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.out.println("New");
            }
        };
        menuItem.addActionListener(lst);
        menuFile.add(menuItem);

        menuItem = new JMenuItem("Open...");
        menuItem.setIcon(new ImageIcon("file_open.gif"));
        menuItem.setMnemonic('o');
        lst = new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                MenuDemo.this.repaint();
                if (fileChooser.showOpenDialog(MenuDemo.this) != JFileChooser.APPROVE_OPTION)
                    return;
                System.out.println(fileChooser.getSelectedFile());
            }
        };
        menuItem.addActionListener(lst);
        menuFile.add(menuItem);

        menuItem = new JMenuItem("Save...");
        menuItem.setIcon(new ImageIcon("file_save.gif"));
        menuItem.setMnemonic('s');
        lst = new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.out.println("Save...");
            }
        };
        menuItem.addActionListener(lst);
        menuFile.add(menuItem);

        menuFile.addSeparator();

        menuItem = new JMenuItem("Exit");
        menuItem.setMnemonic('x');
        lst = new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        };
        menuItem.addActionListener(lst);
        menuFile.add(menuItem);
        menuBar.add(menuFile);

        ActionListener fontListener = new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                updateMonitor();
            }
        };

        JMenu mFont = new JMenu("Font");
        mFont.setMnemonic('o');

        ButtonGroup group = new ButtonGroup();
        menus = new JMenuItem[FontNames.length];
        for (int i = 0; i < FontNames.length; i++) {
            int m = i + 1;
            menus[i] = new JRadioButtonMenuItem(m + " " + FontNames[i]);
            boolean selected = (i == 0);
            menus[i].setSelected(selected);
            menus[i].setMnemonic('1' + i);
            menus[i].setFont(fontArray[i]);
            menus[i].addActionListener(fontListener);
            group.add(menus[i]);
            mFont.add(menus[i]);
        }

        mFont.addSeparator();

        boldMenuItem = new JCheckBoxMenuItem("Bold");
        boldMenuItem.setMnemonic('b');
        Font fn = fontArray[1].deriveFont(Font.BOLD);
        boldMenuItem.setFont(fn);
        boldMenuItem.setSelected(false);
        boldMenuItem.addActionListener(fontListener);
        mFont.add(boldMenuItem);

        italicMenuItem = new JCheckBoxMenuItem("Italic");
        italicMenuItem.setMnemonic('i');
        fn = fontArray[1].deriveFont(Font.ITALIC);
        italicMenuItem.setFont(fn);
        italicMenuItem.setSelected(false);
        italicMenuItem.addActionListener(fontListener);
        mFont.add(italicMenuItem);

        menuBar.add(mFont);

        return menuBar;
    }

    protected void updateMonitor() {
        int index = -1;
        for (int k = 0; k < menus.length; k++) {
            if (menus[k].isSelected()) {
                index = k;
                break;
            }
        }
        if (index == -1)
            return;

        if (index == 2) // Courier
        {
            boldMenuItem.setSelected(false);
            boldMenuItem.setEnabled(false);
            italicMenuItem.setSelected(false);
            italicMenuItem.setEnabled(false);
        } else {
            boldMenuItem.setEnabled(true);
            italicMenuItem.setEnabled(true);
        }

        int style = Font.PLAIN;
        if (boldMenuItem.isSelected())
            style |= Font.BOLD;
        if (italicMenuItem.isSelected())
            style |= Font.ITALIC;
    }

    public static void main(String argv[]) {
        new MenuDemo();
    }
}