MenuDemopublic class MenuDemo extends Object
| Methods Summary |
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| public static void | main(java.lang.String[] args)
// Create a window for this demo
JFrame frame = new JFrame("Menu Demo");
JPanel panel = new JPanel();
frame.getContentPane().add(panel, "Center");
// Create an action listener for the menu items we will create
// The MenuItemActionListener class is defined below
ActionListener listener = new MenuItemActionListener(panel);
// Create some menu panes, and fill them with menu items
// The menuItem() method is important. It is defined below.
JMenu file = new JMenu("File");
file.setMnemonic('F");
file.add(menuItem("New", listener, "new", 'N", KeyEvent.VK_N));
file.add(menuItem("Open...", listener, "open", 'O", KeyEvent.VK_O));
file.add(menuItem("Save", listener, "save", 'S", KeyEvent.VK_S));
file.add(menuItem("Save As...", listener, "saveas", 'A", KeyEvent.VK_A));
JMenu edit = new JMenu("Edit");
edit.setMnemonic('E");
edit.add(menuItem("Cut", listener, "cut", 0, KeyEvent.VK_X));
edit.add(menuItem("Copy", listener, "copy", 'C", KeyEvent.VK_C));
edit.add(menuItem("Paste", listener, "paste", 0, KeyEvent.VK_V));
// Create a menubar and add these panes to it.
JMenuBar menubar = new JMenuBar();
menubar.add(file);
menubar.add(edit);
// Add menubar to the main window. Note special method to add menubars
frame.setJMenuBar(menubar);
// Now create a popup menu and add the some stuff to it
final JPopupMenu popup = new JPopupMenu();
popup.add(menuItem("Open...", listener, "open", 0, 0));
popup.addSeparator(); // Add a separator between items
JMenu colors = new JMenu("Colors"); // Create a submenu
popup.add(colors); // and add it to the popup menu
// Now fill the submenu with mutually-exclusive radio buttons
ButtonGroup colorgroup = new ButtonGroup();
colors.add(radioItem("Red", listener, "color(red)", colorgroup));
colors.add(radioItem("Green", listener, "color(green)", colorgroup));
colors.add(radioItem("Blue", listener, "color(blue)", colorgroup));
// Arrange to display the popup menu when the user clicks in the window
panel.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
// Check whether this is the right type of event to pop up a popup
// menu on this platform. Usually checks for right button down.
if (e.isPopupTrigger())
popup.show((Component)e.getSource(), e.getX(), e.getY());
}
});
// Finally, make our main window appear
frame.setSize(450, 300);
frame.setVisible(true);
| | public static javax.swing.JMenuItem | menuItem(java.lang.String label, java.awt.event.ActionListener listener, java.lang.String command, int mnemonic, int acceleratorKey)
JMenuItem item = new JMenuItem(label);
item.addActionListener(listener);
item.setActionCommand(command);
if (mnemonic != 0) item.setMnemonic((char) mnemonic);
if (acceleratorKey != 0)
item.setAccelerator(KeyStroke.getKeyStroke(acceleratorKey,
java.awt.Event.CTRL_MASK));
return item;
| | public static javax.swing.JMenuItem | radioItem(java.lang.String label, java.awt.event.ActionListener listener, java.lang.String command, javax.swing.ButtonGroup mutExGroup)
JMenuItem item = new JRadioButtonMenuItem(label);
item.addActionListener(listener);
item.setActionCommand(command);
mutExGroup.add(item);
return item;
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