Building menus and menu items: Accelerators and mnemonics
/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly
*/
// IntroExample.java
// An introduction to building menus and menu items. Accelerators and
// mnemonics are added to various items.
//
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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.JRadioButtonMenuItem;
import javax.swing.KeyStroke;
public class IntroExample extends JMenuBar {
String[] fileItems = new String[] { "New", "Open", "Save", "Exit" };
String[] editItems = new String[] { "Undo", "Cut", "Copy", "Paste" };
char[] fileShortcuts = { 'N', 'O', 'S', 'X' };
char[] editShortcuts = { 'Z', 'X', 'C', 'V' };
public IntroExample() {
JMenu fileMenu = new JMenu("File");
JMenu editMenu = new JMenu("Edit");
JMenu otherMenu = new JMenu("Other");
JMenu subMenu = new JMenu("SubMenu");
JMenu subMenu2 = new JMenu("SubMenu2");
// Assemble the File menus with mnemonics
ActionListener printListener = new ActionListener() {
public void actionPerformed(ActionEvent event) {
System.out.println("Menu item [" + event.getActionCommand()
+ "] was pressed.");
}
};
for (int i = 0; i < fileItems.length; i++) {
JMenuItem item = new JMenuItem(fileItems[i], fileShortcuts[i]);
item.addActionListener(printListener);
fileMenu.add(item);
}
// Assemble the File menus with keyboard accelerators
for (int i = 0; i < editItems.length; i++) {
JMenuItem item = new JMenuItem(editItems[i]);
item.setAccelerator(KeyStroke
.getKeyStroke(editShortcuts[i], Toolkit.getDefaultToolkit()
.getMenuShortcutKeyMask(), false));
item.addActionListener(printListener);
editMenu.add(item);
}
// Insert a separator in the Edit Menu in Position 1 after "Undo"
editMenu.insertSeparator(1);
// Assemble the submenus of the Other Menu
JMenuItem item;
subMenu2.add(item = new JMenuItem("Extra 2"));
item.addActionListener(printListener);
subMenu.add(item = new JMenuItem("Extra 1"));
item.addActionListener(printListener);
subMenu.add(subMenu2);
// Assemble the Other Menu itself
otherMenu.add(subMenu);
otherMenu.add(item = new JCheckBoxMenuItem("Check Me"));
item.addActionListener(printListener);
otherMenu.addSeparator();
ButtonGroup buttonGroup = new ButtonGroup();
otherMenu.add(item = new JRadioButtonMenuItem("Radio 1"));
item.addActionListener(printListener);
buttonGroup.add(item);
otherMenu.add(item = new JRadioButtonMenuItem("Radio 2"));
item.addActionListener(printListener);
buttonGroup.add(item);
otherMenu.addSeparator();
otherMenu.add(item = new JMenuItem("Potted Plant", new ImageIcon(
"image.gif")));
item.addActionListener(printListener);
// Finally, add all the menus to the menu bar
add(fileMenu);
add(editMenu);
add(otherMenu);
}
public static void main(String s[]) {
JFrame frame = new JFrame("Simple Menu Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setJMenuBar(new IntroExample());
frame.pack();
frame.setVisible(true);
}
}
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