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Java Forum / GUI / August 2003

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CTRL-X (Accelarator is not working for JMenuItem)

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Asit - 26 Aug 2003 08:09 GMT
I am sending a JMenu creation code sample examples.

Why CTRL-X (Accelarator key is not working for Menu Item).

Is there any solution to make it working.

Regards
Asit

import java.awt.*;
import java.awt.event.*;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.ButtonGroup;
import javax.swing.JMenuBar;
import javax.swing.KeyStroke;
import javax.swing.ImageIcon;

import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.JFrame;

/* MenuDemo.java is a 1.4 application that requires images/middle.gif. */

/*
* This class is just like MenuLookDemo, except the menu items
* actually do something, thanks to event listeners.
*/
public class MenuDemo implements ActionListener, ItemListener {
   JTextArea output;
   JScrollPane scrollPane;
   String newline = "\n";

   public JMenuBar createMenuBar() {
       JMenuBar menuBar;
       JMenu menu, submenu;
       JMenuItem menuItem;
       JRadioButtonMenuItem rbMenuItem;
       JCheckBoxMenuItem cbMenuItem;

       //Create the menu bar.
       menuBar = new JMenuBar();

       //Build the first menu.
       menu = new JMenu("A Menu");
       menu.setMnemonic(KeyEvent.VK_A);
       menu.getAccessibleContext().setAccessibleDescription(
               "The only menu in this program that has menu items");
       menuBar.add(menu);

       //a group of JMenuItems
       menuItem = new JMenuItem("A text-only menu item",
                                KeyEvent.VK_T);
       //menuItem.setMnemonic(KeyEvent.VK_X); //used constructor instead
       menuItem.setAccelerator(KeyStroke.getKeyStroke(
               KeyEvent.VK_X, ActionEvent.CTRL_MASK));
       menuItem.getAccessibleContext().setAccessibleDescription(
               "This doesn't really do anything");
       menuItem.addActionListener(this);
       menu.add(menuItem);

       ImageIcon icon = createImageIcon("images/middle.gif");
       menuItem = new JMenuItem("Both text and icon", icon);
       menuItem.setMnemonic(KeyEvent.VK_B);
       menuItem.addActionListener(this);
       menu.add(menuItem);

       menuItem = new JMenuItem(icon);
       menuItem.setMnemonic(KeyEvent.VK_D);
       menuItem.addActionListener(this);
       menu.add(menuItem);

       //a group of radio button menu items
       menu.addSeparator();
       ButtonGroup group = new ButtonGroup();

       rbMenuItem = new JRadioButtonMenuItem("A radio button menu item");
       rbMenuItem.setSelected(true);
       rbMenuItem.setMnemonic(KeyEvent.VK_R);
       group.add(rbMenuItem);
       rbMenuItem.addActionListener(this);
       menu.add(rbMenuItem);

       rbMenuItem = new JRadioButtonMenuItem("Another one");
       rbMenuItem.setMnemonic(KeyEvent.VK_O);
       group.add(rbMenuItem);
       rbMenuItem.addActionListener(this);
       menu.add(rbMenuItem);

       //a group of check box menu items
       menu.addSeparator();
       cbMenuItem = new JCheckBoxMenuItem("A check box menu item");
       cbMenuItem.setMnemonic(KeyEvent.VK_C);
       cbMenuItem.addItemListener(this);
       menu.add(cbMenuItem);

       cbMenuItem = new JCheckBoxMenuItem("Another one");
       cbMenuItem.setMnemonic(KeyEvent.VK_H);
       cbMenuItem.addItemListener(this);
       menu.add(cbMenuItem);

       //a submenu
       menu.addSeparator();
       submenu = new JMenu("A submenu");
       submenu.setMnemonic(KeyEvent.VK_S);

       menuItem = new JMenuItem("An item in the submenu");
       menuItem.setAccelerator(KeyStroke.getKeyStroke(
               KeyEvent.VK_2, ActionEvent.ALT_MASK));
       menuItem.addActionListener(this);
       submenu.add(menuItem);

       menuItem = new JMenuItem("Another item");
       menuItem.addActionListener(this);
       submenu.add(menuItem);
       menu.add(submenu);

       //Build second menu in the menu bar.
       menu = new JMenu("Another Menu");
       menu.setMnemonic(KeyEvent.VK_N);
       menu.getAccessibleContext().setAccessibleDescription(
               "This menu does nothing");
       menuBar.add(menu);

       return menuBar;
   }

   public Container createContentPane() {
       //Create the content-pane-to-be.
       JPanel contentPane = new JPanel(new BorderLayout());
       contentPane.setOpaque(true);

       //Create a scrolled text area.
       output = new JTextArea(5, 30);
       output.setEditable(false);
       scrollPane = new JScrollPane(output);

       //Add the text area to the content pane.
       contentPane.add(scrollPane, BorderLayout.CENTER);

       return contentPane;
   }

   public void actionPerformed(ActionEvent e) {
       JMenuItem source = (JMenuItem)(e.getSource());
       String s = "Action event detected."
                  + newline
                  + "    Event source: " + source.getText()
                  + " (an instance of " + getClassName(source) + ")";
       output.append(s + newline);
   }

   public void itemStateChanged(ItemEvent e) {
       JMenuItem source = (JMenuItem)(e.getSource());
       String s = "Item event detected."
                  + newline
                  + "    Event source: " + source.getText()
                  + " (an instance of " + getClassName(source) + ")"
                  + newline
                  + "    New state: "
                  + ((e.getStateChange() == ItemEvent.SELECTED) ?
                    "selected":"unselected");
       output.append(s + newline);
   }

   // Returns just the class name -- no package info.
   protected String getClassName(Object o) {
       String classString = o.getClass().getName();
       int dotIndex = classString.lastIndexOf(".");
       return classString.substring(dotIndex+1);
   }

   /** Returns an ImageIcon, or null if the path was invalid. */
   protected static ImageIcon createImageIcon(String path) {
       java.net.URL imgURL = MenuDemo.class.getResource(path);
       if (imgURL != null) {
           return new ImageIcon(imgURL);
       } else {
           System.err.println("Couldn't find file: " + path);
           return null;
       }
   }

   public static void main(String[] args) {
       //Make sure we have nice window decorations.
       JFrame.setDefaultLookAndFeelDecorated(true);

       //Create and set up the window.
       JFrame frame = new JFrame("MenuDemo");
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

       //Create/set menu bar and content pane.
       MenuDemo demo = new MenuDemo();
       frame.setJMenuBar(demo.createMenuBar());
       frame.setContentPane(demo.createContentPane());

       //Display the window.
       frame.setSize(450, 260);
       frame.setVisible(true);
   }
}
Fred L. Kleinschmidt - 26 Aug 2003 16:59 GMT
> I am sending a JMenu creation code sample examples.
>
[quoted text clipped - 200 lines]
>     }
> }

Works OK when I try it. Be sure you do not have caplock or numlock on...
Signature

Fred L. Kleinschmidt
Associate Technical Fellow
Boeing Common User Interface Services

Asit - 27 Aug 2003 11:58 GMT
I have trying with both CAPs lock and Num lock off but still is not working.
It is working with CTRL-Y and any other key but not CTRL-X.

If I run the program and do nothing then i pressed CTRL-X nothing is happening ?

> > I am sending a JMenu creation code sample examples.
> >
[quoted text clipped - 202 lines]
>
> Works OK when I try it. Be sure you do not have caplock or numlock on...
Christian Kaufhold - 27 Aug 2003 15:15 GMT
Hello!

> I am sending a JMenu creation code sample examples.
>
> Why CTRL-X (Accelarator key is not working for Menu Item).

Presumably because the textarea, which has focus, uses CTRL-X for "Cut".

Either do not give it the focus, or disable its cut-action.

textArea.getActioMap().put(DefaultEditorKit.cutAction,
   new AbstractAction() { public boolean isEnabled() { return false } });

Christian


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