Swing Menus and Toolbars - The Definitive Guide to Java Swing - page 191

■ Note Although you can add any component to a menu, if the component doesn't implement the MenuElement

interface, it won't act properly when a mouse moves over the component or when the component is selected.

Listing 6-6. Toggle Button As Menu Item Class Definition

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class JToggleButtonMenuItem extends JToggleButton implements MenuElement {
Color savedForeground = null;
private static MenuElement NO_SUB_ELEMENTS[] = new MenuElement[0];
public JToggleButtonMenuItem() {
init();
}
public JToggleButtonMenuItem(String label) {
super(label);
init();
}
public JToggleButtonMenuItem(String label, Icon icon) {
super(label, icon);
init();
}
public JToggleButtonMenuItem(Action action) {
super(action);
init();
}
private void init() {
updateUI();
setRequestFocusEnabled(false);
// Borrows heavily from BasicMenuUI
MouseInputListener mouseInputListener = new MouseInputListener() {
// If mouse released over this menu item, activate it
public void mouseReleased(MouseEvent mouseEvent) {
MenuSelectionManager menuSelectionManager =
MenuSelectionManager.defaultManager();
Point point = mouseEvent.getPoint();
if ((point.x >= 0) &&
(point.x < getWidth()) &&
(point.y >= 0) &&
(point.y < getHeight())) {
menuSelectionManager.clearSelectedPath();
// Component automatically handles "selection" at this point
// doClick(0); // not necessary