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| 14. 21. 10. Using MenuListener to listen to: menu canceled, selected and deselected events |
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With a registered MenuListener, you're notified when a JMenu is selected before the pop-up
menu is opened with the menu's choices. |
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public interface MenuListener extends EventListener {
public void menuCanceled(MenuEvent e);
public void menuDeselected(MenuEvent e);
public void menuSelected(MenuEvent e);
}
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import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.event.MenuEvent;
import javax.swing.event.MenuListener;
public class ContructMenuWithAction {
public static void main(final String args[]) {
JFrame frame = new JFrame("MenuSample Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuBar menuBar = new JMenuBar();
// File Menu, F - Mnemonic
JMenu fileMenu = new JMenu("File");
fileMenu.setMnemonic(KeyEvent.VK_F);
menuBar.add(fileMenu);
fileMenu.addMenuListener(new MenuListener() {
public void menuSelected(MenuEvent e) {
System.out.println("menuSelected");
}
public void menuDeselected(MenuEvent e) {
System.out.println("menuDeselected");
}
public void menuCanceled(MenuEvent e) {
System.out.println("menuCanceled");
}
});
// File->New, N - Mnemonic
JMenuItem newMenuItem = new JMenuItem("New");
fileMenu.add(newMenuItem);
frame.setJMenuBar(menuBar);
frame.setSize(350, 250);
frame.setVisible(true);
}
}
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