https://openjdk.java.net/ 
/*
 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package javax.swing;

import java.util.EventListener;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import java.io.Serializable;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;

import javax.swing.plaf.*;
import javax.swing.plaf.basic.*;
import javax.swing.event.*;
import javax.accessibility.*;


An implementation of an item in a menu. A menu item is essentially a button
sitting in a list. When the user selects the "button", the action
associated with the menu item is performed. A JMenuItem
contained in a JPopupMenu performs exactly that function.


Menu items can be configured, and to some degree controlled, by
Actions.  Using an
Action with a menu item has many benefits beyond directly
configuring a menu item.  Refer to 
Swing Components Supporting Action for more
details, and you can find more information in How
to Use Actions, a section in The Java Tutorial.


For further documentation and for examples, see
How to Use Menus
in The Java Tutorial.


Warning: Swing is not thread safe. For more
information see Swing's Threading
Policy.


Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing.  As of 1.4, support for long term storage
of all JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. 
Author:Georges Saab, David Karlton
See Also:
@beaninfo
  attribute: isContainer false
description: An item which can be selected in a menu.
/**
 * An implementation of an item in a menu. A menu item is essentially a button
 * sitting in a list. When the user selects the "button", the action
 * associated with the menu item is performed. A <code>JMenuItem</code>
 * contained in a <code>JPopupMenu</code> performs exactly that function.
 * <p>
 * Menu items can be configured, and to some degree controlled, by
 * <code><a href="Action.html">Action</a></code>s.  Using an
 * <code>Action</code> with a menu item has many benefits beyond directly
 * configuring a menu item.  Refer to <a href="Action.html#buttonActions">
 * Swing Components Supporting <code>Action</code></a> for more
 * details, and you can find more information in <a
 * href="https://docs.oracle.com/javase/tutorial/uiswing/misc/action.html">How
 * to Use Actions</a>, a section in <em>The Java Tutorial</em>.
 * <p>
 * For further documentation and for examples, see
 * <a
 href="https://docs.oracle.com/javase/tutorial/uiswing/components/menu.html">How to Use Menus</a>
 * in <em>The Java Tutorial.</em>
 * <p>
 * <strong>Warning:</strong> Swing is not thread safe. For more
 * information see <a
 * href="package-summary.html#threading">Swing's Threading
 * Policy</a>.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @beaninfo
 *   attribute: isContainer false
 * description: An item which can be selected in a menu.
 *
 * @author Georges Saab
 * @author David Karlton
 * @see JPopupMenu
 * @see JMenu
 * @see JCheckBoxMenuItem
 * @see JRadioButtonMenuItem
 */
@SuppressWarnings("serial")
public class JMenuItem extends AbstractButton implements Accessible,MenuElement  {

    
See Also:
/**
     * @see #getUIClassID
     * @see #readObject
     */
    private static final String uiClassID = "MenuItemUI";

    /* diagnostic aids -- should be false for production builds. */
    private static final boolean TRACE =   false; // trace creates and disposes
    private static final boolean VERBOSE = false; // show reuse hits/misses
    private static final boolean DEBUG =   false;  // show bad params, misc.

    private boolean isMouseDragged = false;

    
Creates a JMenuItem with no set text or icon.

/**
     * Creates a <code>JMenuItem</code> with no set text or icon.
     */
    public JMenuItem() {
        this(null, (Icon)null);
    }

    
Creates a JMenuItem with the specified icon.

Params:
  • icon – the icon of the JMenuItem
/**
     * Creates a <code>JMenuItem</code> with the specified icon.
     *
     * @param icon the icon of the <code>JMenuItem</code>
     */
    public JMenuItem(Icon icon) {
        this(null, icon);
    }

    
Creates a JMenuItem with the specified text.

Params:
  • text – the text of the JMenuItem
/**
     * Creates a <code>JMenuItem</code> with the specified text.
     *
     * @param text the text of the <code>JMenuItem</code>
     */
    public JMenuItem(String text) {
        this(text, (Icon)null);
    }

    
Creates a menu item whose properties are taken from the
specified Action.

Params:
  • a – the action of the JMenuItem
Since:1.3
/**
     * Creates a menu item whose properties are taken from the
     * specified <code>Action</code>.
     *
     * @param a the action of the <code>JMenuItem</code>
     * @since 1.3
     */
    public JMenuItem(Action a) {
        this();
        setAction(a);
    }

    
Creates a JMenuItem with the specified text and icon.

Params:
  • text – the text of the JMenuItem
  • icon – the icon of the JMenuItem
/**
     * Creates a <code>JMenuItem</code> with the specified text and icon.
     *
     * @param text the text of the <code>JMenuItem</code>
     * @param icon the icon of the <code>JMenuItem</code>
     */
    public JMenuItem(String text, Icon icon) {
        setModel(new DefaultButtonModel());
        init(text, icon);
        initFocusability();
    }

    
Creates a JMenuItem with the specified text and
keyboard mnemonic.

Params:
  • text – the text of the JMenuItem
  • mnemonic – the keyboard mnemonic for the JMenuItem
/**
     * Creates a <code>JMenuItem</code> with the specified text and
     * keyboard mnemonic.
     *
     * @param text the text of the <code>JMenuItem</code>
     * @param mnemonic the keyboard mnemonic for the <code>JMenuItem</code>
     */
    public JMenuItem(String text, int mnemonic) {
        setModel(new DefaultButtonModel());
        init(text, null);
        setMnemonic(mnemonic);
        initFocusability();
    }

    
{@inheritDoc}

/**
     * {@inheritDoc}
     */
    public void setModel(ButtonModel newModel) {
        super.setModel(newModel);
        if(newModel instanceof DefaultButtonModel) {
            ((DefaultButtonModel)newModel).setMenuItem(true);
        }
    }

    
Inititalizes the focusability of the the JMenuItem.
JMenuItem's are focusable, but subclasses may want to be, this provides them the opportunity to override this and invoke something else, or nothing at all. Refer to JMenu.initFocusability for the motivation of this. 
/**
     * Inititalizes the focusability of the the <code>JMenuItem</code>.
     * <code>JMenuItem</code>'s are focusable, but subclasses may
     * want to be, this provides them the opportunity to override this
     * and invoke something else, or nothing at all. Refer to
     * {@link javax.swing.JMenu#initFocusability} for the motivation of
     * this.
     */
    void initFocusability() {
        setFocusable(false);
    }

    
Initializes the menu item with the specified text and icon.

Params:
  • text – the text of the JMenuItem
  • icon – the icon of the JMenuItem
/**
     * Initializes the menu item with the specified text and icon.
     *
     * @param text the text of the <code>JMenuItem</code>
     * @param icon the icon of the <code>JMenuItem</code>
     */
    protected void init(String text, Icon icon) {
        if(text != null) {
            setText(text);
        }

        if(icon != null) {
            setIcon(icon);
        }

        // Listen for Focus events
        addFocusListener(new MenuItemFocusListener());
        setUIProperty("borderPainted", Boolean.FALSE);
        setFocusPainted(false);
        setHorizontalTextPosition(JButton.TRAILING);
        setHorizontalAlignment(JButton.LEADING);
        updateUI();
    }

    private static class MenuItemFocusListener implements FocusListener,
        Serializable {
        public void focusGained(FocusEvent event) {}
        public void focusLost(FocusEvent event) {
            // When focus is lost, repaint if
            // the focus information is painted
            JMenuItem mi = (JMenuItem)event.getSource();
            if(mi.isFocusPainted()) {
                mi.repaint();
            }
        }
    }


    
Sets the look and feel object that renders this component.

Params:
  • ui –  the JMenuItemUI L&F object
See Also:
@beaninfo
       bound: true
      hidden: true
   attribute: visualUpdate true
 description: The UI object that implements the Component's LookAndFeel.
/**
     * Sets the look and feel object that renders this component.
     *
     * @param ui  the <code>JMenuItemUI</code> L&amp;F object
     * @see UIDefaults#getUI
     * @beaninfo
     *        bound: true
     *       hidden: true
     *    attribute: visualUpdate true
     *  description: The UI object that implements the Component's LookAndFeel.
     */
    public void setUI(MenuItemUI ui) {
        super.setUI(ui);
    }

    
Resets the UI property with a value from the current look and feel.

See Also:
  • updateUI.updateUI
/**
     * Resets the UI property with a value from the current look and feel.
     *
     * @see JComponent#updateUI
     */
    public void updateUI() {
        setUI((MenuItemUI)UIManager.getUI(this));
    }


    
Returns the suffix used to construct the name of the L&F class used to
render this component.

See Also:
Returns:the string "MenuItemUI"
/**
     * Returns the suffix used to construct the name of the L&amp;F class used to
     * render this component.
     *
     * @return the string "MenuItemUI"
     * @see JComponent#getUIClassID
     * @see UIDefaults#getUI
     */
    public String getUIClassID() {
        return uiClassID;
    }


    
Identifies the menu item as "armed". If the mouse button is
released while it is over this item, the menu's action event
will fire. If the mouse button is released elsewhere, the
event will not fire and the menu item will be disarmed.

Params:
  • b – true to arm the menu item so it can be selected
@beaninfo
   description: Mouse release will fire an action event
        hidden: true
/**
     * Identifies the menu item as "armed". If the mouse button is
     * released while it is over this item, the menu's action event
     * will fire. If the mouse button is released elsewhere, the
     * event will not fire and the menu item will be disarmed.
     *
     * @param b true to arm the menu item so it can be selected
     * @beaninfo
     *    description: Mouse release will fire an action event
     *         hidden: true
     */
    public void setArmed(boolean b) {
        ButtonModel model = getModel();

        boolean oldValue = model.isArmed();
        if(model.isArmed() != b) {
            model.setArmed(b);
        }
    }

    
Returns whether the menu item is "armed".

See Also:
Returns:true if the menu item is armed, and it can be selected
/**
     * Returns whether the menu item is "armed".
     *
     * @return true if the menu item is armed, and it can be selected
     * @see #setArmed
     */
    public boolean isArmed() {
        ButtonModel model = getModel();
        return model.isArmed();
    }

    
Enables or disables the menu item.

Params:
  • b –  true to enable the item
@beaninfo
   description: Does the component react to user interaction
         bound: true
     preferred: true
/**
     * Enables or disables the menu item.
     *
     * @param b  true to enable the item
     * @beaninfo
     *    description: Does the component react to user interaction
     *          bound: true
     *      preferred: true
     */
    public void setEnabled(boolean b) {
        // Make sure we aren't armed!
        if (!b && !UIManager.getBoolean("MenuItem.disabledAreNavigable")) {
            setArmed(false);
        }
        super.setEnabled(b);
    }


    
Returns true since Menus, by definition,
should always be on top of all other windows.  If the menu is
in an internal frame false is returned due to the rollover effect
for windows laf where the menu is not always on top.

/**
     * Returns true since <code>Menu</code>s, by definition,
     * should always be on top of all other windows.  If the menu is
     * in an internal frame false is returned due to the rollover effect
     * for windows laf where the menu is not always on top.
     */
    // package private
    boolean alwaysOnTop() {
        // Fix for bug #4482165
        if (SwingUtilities.getAncestorOfClass(JInternalFrame.class, this) !=
                null) {
            return false;
        }
        return true;
    }


    /* The keystroke which acts as the menu item's accelerator
     */
    private KeyStroke accelerator;

    
Sets the key combination which invokes the menu item's
action listeners without navigating the menu hierarchy. It is the
UI's responsibility to install the correct action.  Note that
when the keyboard accelerator is typed, it will work whether or
not the menu is currently displayed.

Params:
  • keyStroke – the KeyStroke which will
         serve as an accelerator
@beaninfo
    description: The keystroke combination which will invoke the
                 JMenuItem's actionlisteners without navigating the
                 menu hierarchy
          bound: true
      preferred: true
/**
     * Sets the key combination which invokes the menu item's
     * action listeners without navigating the menu hierarchy. It is the
     * UI's responsibility to install the correct action.  Note that
     * when the keyboard accelerator is typed, it will work whether or
     * not the menu is currently displayed.
     *
     * @param keyStroke the <code>KeyStroke</code> which will
     *          serve as an accelerator
     * @beaninfo
     *     description: The keystroke combination which will invoke the
     *                  JMenuItem's actionlisteners without navigating the
     *                  menu hierarchy
     *           bound: true
     *       preferred: true
     */
    public void setAccelerator(KeyStroke keyStroke) {
        KeyStroke oldAccelerator = accelerator;
        this.accelerator = keyStroke;
        repaint();
        revalidate();
        firePropertyChange("accelerator", oldAccelerator, accelerator);
    }

    
Returns the KeyStroke which serves as an accelerator
for the menu item.

Returns:a KeyStroke object identifying the
         accelerator key
/**
     * Returns the <code>KeyStroke</code> which serves as an accelerator
     * for the menu item.
     * @return a <code>KeyStroke</code> object identifying the
     *          accelerator key
     */
    public KeyStroke getAccelerator() {
        return this.accelerator;
    }

    
{@inheritDoc}

Since:1.3
/**
     * {@inheritDoc}
     *
     * @since 1.3
     */
    protected void configurePropertiesFromAction(Action a) {
        super.configurePropertiesFromAction(a);
        configureAcceleratorFromAction(a);
    }

    void setIconFromAction(Action a) {
        Icon icon = null;
        if (a != null) {
            icon = (Icon)a.getValue(Action.SMALL_ICON);
        }
        setIcon(icon);
    }

    void largeIconChanged(Action a) {
    }

    void smallIconChanged(Action a) {
        setIconFromAction(a);
    }

    void configureAcceleratorFromAction(Action a) {
        KeyStroke ks = (a==null) ? null :
            (KeyStroke)a.getValue(Action.ACCELERATOR_KEY);
        setAccelerator(ks);
    }

    
{@inheritDoc}

Since:1.6
/**
     * {@inheritDoc}
     * @since 1.6
     */
    protected void actionPropertyChanged(Action action, String propertyName) {
        if (propertyName == Action.ACCELERATOR_KEY) {
            configureAcceleratorFromAction(action);
        }
        else {
            super.actionPropertyChanged(action, propertyName);
        }
    }

    
Processes a mouse event forwarded from the
MenuSelectionManager and changes the menu
selection, if necessary, by using the
MenuSelectionManager's API.


Note: you do not have to forward the event to sub-components.
This is done automatically by the MenuSelectionManager.

Params:
  • e –   a MouseEvent
  • path –  the MenuElement path array
  • manager –   the MenuSelectionManager
/**
     * Processes a mouse event forwarded from the
     * <code>MenuSelectionManager</code> and changes the menu
     * selection, if necessary, by using the
     * <code>MenuSelectionManager</code>'s API.
     * <p>
     * Note: you do not have to forward the event to sub-components.
     * This is done automatically by the <code>MenuSelectionManager</code>.
     *
     * @param e   a <code>MouseEvent</code>
     * @param path  the <code>MenuElement</code> path array
     * @param manager   the <code>MenuSelectionManager</code>
     */
    public void processMouseEvent(MouseEvent e,MenuElement path[],MenuSelectionManager manager) {
        processMenuDragMouseEvent(
                 new MenuDragMouseEvent(e.getComponent(), e.getID(),
                                        e.getWhen(),
                                        e.getModifiers(), e.getX(), e.getY(),
                                        e.getXOnScreen(), e.getYOnScreen(),
                                        e.getClickCount(), e.isPopupTrigger(),
                                        path, manager));
    }


    
Processes a key event forwarded from the
MenuSelectionManager and changes the menu selection,
if necessary, by using MenuSelectionManager's API.


Note: you do not have to forward the event to sub-components.
This is done automatically by the MenuSelectionManager.

Params:
  • e –  a KeyEvent
  • path – the MenuElement path array
  • manager –   the MenuSelectionManager
/**
     * Processes a key event forwarded from the
     * <code>MenuSelectionManager</code> and changes the menu selection,
     * if necessary, by using <code>MenuSelectionManager</code>'s API.
     * <p>
     * Note: you do not have to forward the event to sub-components.
     * This is done automatically by the <code>MenuSelectionManager</code>.
     *
     * @param e  a <code>KeyEvent</code>
     * @param path the <code>MenuElement</code> path array
     * @param manager   the <code>MenuSelectionManager</code>
     */
    public void processKeyEvent(KeyEvent e,MenuElement path[],MenuSelectionManager manager) {
        if (DEBUG) {
            System.out.println("in JMenuItem.processKeyEvent/3 for " + getText() +
                                   "  " + KeyStroke.getKeyStrokeForEvent(e));
        }
        MenuKeyEvent mke = new MenuKeyEvent(e.getComponent(), e.getID(),
                                             e.getWhen(), e.getModifiers(),
                                             e.getKeyCode(), e.getKeyChar(),
                                             path, manager);
        processMenuKeyEvent(mke);

        if (mke.isConsumed())  {
            e.consume();
        }
    }



    
Handles mouse drag in a menu.

Params:
  • e –  a MenuDragMouseEvent object
/**
     * Handles mouse drag in a menu.
     *
     * @param e  a <code>MenuDragMouseEvent</code> object
     */
    public void processMenuDragMouseEvent(MenuDragMouseEvent e) {
        switch (e.getID()) {
        case MouseEvent.MOUSE_ENTERED:
            isMouseDragged = false; fireMenuDragMouseEntered(e); break;
        case MouseEvent.MOUSE_EXITED:
            isMouseDragged = false; fireMenuDragMouseExited(e); break;
        case MouseEvent.MOUSE_DRAGGED:
            isMouseDragged = true; fireMenuDragMouseDragged(e); break;
        case MouseEvent.MOUSE_RELEASED:
            if(isMouseDragged) fireMenuDragMouseReleased(e); break;
        default:
            break;
        }
    }

    
Handles a keystroke in a menu.

Params:
  • e –  a MenuKeyEvent object
/**
     * Handles a keystroke in a menu.
     *
     * @param e  a <code>MenuKeyEvent</code> object
     */
    public void processMenuKeyEvent(MenuKeyEvent e) {
        if (DEBUG) {
            System.out.println("in JMenuItem.processMenuKeyEvent for " + getText()+
                                   "  " + KeyStroke.getKeyStrokeForEvent(e));
        }
        switch (e.getID()) {
        case KeyEvent.KEY_PRESSED:
            fireMenuKeyPressed(e); break;
        case KeyEvent.KEY_RELEASED:
            fireMenuKeyReleased(e); break;
        case KeyEvent.KEY_TYPED:
            fireMenuKeyTyped(e); break;
        default:
            break;
        }
    }

    
Notifies all listeners that have registered interest for
notification on this event type.

Params:
  • event – a MenuMouseDragEvent
See Also:
/**
     * Notifies all listeners that have registered interest for
     * notification on this event type.
     *
     * @param event a <code>MenuMouseDragEvent</code>
     * @see EventListenerList
     */
    protected void fireMenuDragMouseEntered(MenuDragMouseEvent event) {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==MenuDragMouseListener.class) {
                // Lazily create the event:
                ((MenuDragMouseListener)listeners[i+1]).menuDragMouseEntered(event);
            }
        }
    }

    
Notifies all listeners that have registered interest for
notification on this event type.

Params:
  • event – a MenuDragMouseEvent
See Also:
/**
     * Notifies all listeners that have registered interest for
     * notification on this event type.
     *
     * @param event a <code>MenuDragMouseEvent</code>
     * @see EventListenerList
     */
    protected void fireMenuDragMouseExited(MenuDragMouseEvent event) {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==MenuDragMouseListener.class) {
                // Lazily create the event:
                ((MenuDragMouseListener)listeners[i+1]).menuDragMouseExited(event);
            }
        }
    }

    
Notifies all listeners that have registered interest for
notification on this event type.

Params:
  • event – a MenuDragMouseEvent
See Also:
/**
     * Notifies all listeners that have registered interest for
     * notification on this event type.
     *
     * @param event a <code>MenuDragMouseEvent</code>
     * @see EventListenerList
     */
    protected void fireMenuDragMouseDragged(MenuDragMouseEvent event) {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==MenuDragMouseListener.class) {
                // Lazily create the event:
                ((MenuDragMouseListener)listeners[i+1]).menuDragMouseDragged(event);
            }
        }
    }

    
Notifies all listeners that have registered interest for
notification on this event type.

Params:
  • event – a MenuDragMouseEvent
See Also:
/**
     * Notifies all listeners that have registered interest for
     * notification on this event type.
     *
     * @param event a <code>MenuDragMouseEvent</code>
     * @see EventListenerList
     */
    protected void fireMenuDragMouseReleased(MenuDragMouseEvent event) {
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==MenuDragMouseListener.class) {
                // Lazily create the event:
                ((MenuDragMouseListener)listeners[i+1]).menuDragMouseReleased(event);
            }
        }
    }

    
Notifies all listeners that have registered interest for
notification on this event type.

Params:
  • event – a MenuKeyEvent
See Also:
/**
     * Notifies all listeners that have registered interest for
     * notification on this event type.
     *
     * @param event a <code>MenuKeyEvent</code>
     * @see EventListenerList
     */
    protected void fireMenuKeyPressed(MenuKeyEvent event) {
        if (DEBUG) {
            System.out.println("in JMenuItem.fireMenuKeyPressed for " + getText()+
                                   "  " + KeyStroke.getKeyStrokeForEvent(event));
        }
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==MenuKeyListener.class) {
                // Lazily create the event:
                ((MenuKeyListener)listeners[i+1]).menuKeyPressed(event);
            }
        }
    }

    
Notifies all listeners that have registered interest for
notification on this event type.

Params:
  • event – a MenuKeyEvent
See Also:
/**
     * Notifies all listeners that have registered interest for
     * notification on this event type.
     *
     * @param event a <code>MenuKeyEvent</code>
     * @see EventListenerList
     */
    protected void fireMenuKeyReleased(MenuKeyEvent event) {
        if (DEBUG) {
            System.out.println("in JMenuItem.fireMenuKeyReleased for " + getText()+
                                   "  " + KeyStroke.getKeyStrokeForEvent(event));
        }
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==MenuKeyListener.class) {
                // Lazily create the event:
                ((MenuKeyListener)listeners[i+1]).menuKeyReleased(event);
            }
        }
    }

    
Notifies all listeners that have registered interest for
notification on this event type.

Params:
  • event – a MenuKeyEvent
See Also:
/**
     * Notifies all listeners that have registered interest for
     * notification on this event type.
     *
     * @param event a <code>MenuKeyEvent</code>
     * @see EventListenerList
     */
    protected void fireMenuKeyTyped(MenuKeyEvent event) {
        if (DEBUG) {
            System.out.println("in JMenuItem.fireMenuKeyTyped for " + getText()+
                                   "  " + KeyStroke.getKeyStrokeForEvent(event));
        }
        // Guaranteed to return a non-null array
        Object[] listeners = listenerList.getListenerList();
        // Process the listeners last to first, notifying
        // those that are interested in this event
        for (int i = listeners.length-2; i>=0; i-=2) {
            if (listeners[i]==MenuKeyListener.class) {
                // Lazily create the event:
                ((MenuKeyListener)listeners[i+1]).menuKeyTyped(event);
            }
        }
    }

    
Called by the MenuSelectionManager when the
MenuElement is selected or unselected.

Params:
  • isIncluded –  true if this menu item is on the part of the menu
                   path that changed, false if this menu is part of the
                   a menu path that changed, but this particular part of
                   that path is still the same
See Also:
/**
     * Called by the <code>MenuSelectionManager</code> when the
     * <code>MenuElement</code> is selected or unselected.
     *
     * @param isIncluded  true if this menu item is on the part of the menu
     *                    path that changed, false if this menu is part of the
     *                    a menu path that changed, but this particular part of
     *                    that path is still the same
     * @see MenuSelectionManager#setSelectedPath(MenuElement[])
     */
    public void menuSelectionChanged(boolean isIncluded) {
        setArmed(isIncluded);
    }

    
This method returns an array containing the sub-menu
components for this menu component.

Returns:an array of MenuElements
/**
     * This method returns an array containing the sub-menu
     * components for this menu component.
     *
     * @return an array of <code>MenuElement</code>s
     */
    public MenuElement[] getSubElements() {
        return new MenuElement[0];
    }

    
Returns the java.awt.Component used to paint
this object. The returned component will be used to convert
events and detect if an event is inside a menu component.

Returns:the Component that paints this menu item
/**
     * Returns the <code>java.awt.Component</code> used to paint
     * this object. The returned component will be used to convert
     * events and detect if an event is inside a menu component.
     *
     * @return the <code>Component</code> that paints this menu item
     */
    public Component getComponent() {
        return this;
    }

    
Adds a MenuDragMouseListener to the menu item.

Params:
  • l – the MenuDragMouseListener to be added
/**
     * Adds a <code>MenuDragMouseListener</code> to the menu item.
     *
     * @param l the <code>MenuDragMouseListener</code> to be added
     */
    public void addMenuDragMouseListener(MenuDragMouseListener l) {
        listenerList.add(MenuDragMouseListener.class, l);
    }

    
Removes a MenuDragMouseListener from the menu item.

Params:
  • l – the MenuDragMouseListener to be removed
/**
     * Removes a <code>MenuDragMouseListener</code> from the menu item.
     *
     * @param l the <code>MenuDragMouseListener</code> to be removed
     */
    public void removeMenuDragMouseListener(MenuDragMouseListener l) {
        listenerList.remove(MenuDragMouseListener.class, l);
    }

    
Returns an array of all the MenuDragMouseListeners added
to this JMenuItem with addMenuDragMouseListener().

Returns:all of the MenuDragMouseListeners added or an empty
        array if no listeners have been added
Since:1.4
/**
     * Returns an array of all the <code>MenuDragMouseListener</code>s added
     * to this JMenuItem with addMenuDragMouseListener().
     *
     * @return all of the <code>MenuDragMouseListener</code>s added or an empty
     *         array if no listeners have been added
     * @since 1.4
     */
    public MenuDragMouseListener[] getMenuDragMouseListeners() {
        return listenerList.getListeners(MenuDragMouseListener.class);
    }

    
Adds a MenuKeyListener to the menu item.

Params:
  • l – the MenuKeyListener to be added
/**
     * Adds a <code>MenuKeyListener</code> to the menu item.
     *
     * @param l the <code>MenuKeyListener</code> to be added
     */
    public void addMenuKeyListener(MenuKeyListener l) {
        listenerList.add(MenuKeyListener.class, l);
    }

    
Removes a MenuKeyListener from the menu item.

Params:
  • l – the MenuKeyListener to be removed
/**
     * Removes a <code>MenuKeyListener</code> from the menu item.
     *
     * @param l the <code>MenuKeyListener</code> to be removed
     */
    public void removeMenuKeyListener(MenuKeyListener l) {
        listenerList.remove(MenuKeyListener.class, l);
    }

    
Returns an array of all the MenuKeyListeners added
to this JMenuItem with addMenuKeyListener().

Returns:all of the MenuKeyListeners added or an empty
        array if no listeners have been added
Since:1.4
/**
     * Returns an array of all the <code>MenuKeyListener</code>s added
     * to this JMenuItem with addMenuKeyListener().
     *
     * @return all of the <code>MenuKeyListener</code>s added or an empty
     *         array if no listeners have been added
     * @since 1.4
     */
    public MenuKeyListener[] getMenuKeyListeners() {
        return listenerList.getListeners(MenuKeyListener.class);
    }

    
See JComponent.readObject() for information about serialization
in Swing.

/**
     * See JComponent.readObject() for information about serialization
     * in Swing.
     */
    private void readObject(ObjectInputStream s)
        throws IOException, ClassNotFoundException
    {
        s.defaultReadObject();
        if (getUIClassID().equals(uiClassID)) {
            updateUI();
        }
    }

    private void writeObject(ObjectOutputStream s) throws IOException {
        s.defaultWriteObject();
        if (getUIClassID().equals(uiClassID)) {
            byte count = JComponent.getWriteObjCounter(this);
            JComponent.setWriteObjCounter(this, --count);
            if (count == 0 && ui != null) {
                ui.installUI(this);
            }
        }
    }


    
Returns a string representation of this JMenuItem.
This method is intended to be used only for debugging purposes,
and the content and format of the returned string may vary between
implementations. The returned string may be empty but may not
be null.

Returns: a string representation of this JMenuItem
/**
     * Returns a string representation of this <code>JMenuItem</code>.
     * This method is intended to be used only for debugging purposes,
     * and the content and format of the returned string may vary between
     * implementations. The returned string may be empty but may not
     * be <code>null</code>.
     *
     * @return  a string representation of this <code>JMenuItem</code>
     */
    protected String paramString() {
        return super.paramString();
    }

/////////////////
// Accessibility support
////////////////

    
Returns the AccessibleContext associated with this
JMenuItem. For JMenuItems,
the AccessibleContext takes the form of an
AccessibleJMenuItem.
A new AccessibleJMenuItme instance is created if necessary.

Returns:an AccessibleJMenuItem that serves as the
        AccessibleContext of this JMenuItem
/**
     * Returns the <code>AccessibleContext</code> associated with this
     * <code>JMenuItem</code>. For <code>JMenuItem</code>s,
     * the <code>AccessibleContext</code> takes the form of an
     * <code>AccessibleJMenuItem</code>.
     * A new AccessibleJMenuItme instance is created if necessary.
     *
     * @return an <code>AccessibleJMenuItem</code> that serves as the
     *         <code>AccessibleContext</code> of this <code>JMenuItem</code>
     */
    public AccessibleContext getAccessibleContext() {
        if (accessibleContext == null) {
            accessibleContext = new AccessibleJMenuItem();
        }
        return accessibleContext;
    }


    
This class implements accessibility support for the
JMenuItem class.  It provides an implementation of the
Java Accessibility API appropriate to menu item user-interface
elements.


Warning:
Serialized objects of this class will not be compatible with
future Swing releases. The current serialization support is
appropriate for short term storage or RMI between applications running
the same version of Swing.  As of 1.4, support for long term storage
of all JavaBeans™
has been added to the java.beans package. Please see XMLEncoder. 
/**
     * This class implements accessibility support for the
     * <code>JMenuItem</code> class.  It provides an implementation of the
     * Java Accessibility API appropriate to menu item user-interface
     * elements.
     * <p>
     * <strong>Warning:</strong>
     * Serialized objects of this class will not be compatible with
     * future Swing releases. The current serialization support is
     * appropriate for short term storage or RMI between applications running
     * the same version of Swing.  As of 1.4, support for long term storage
     * of all JavaBeans&trade;
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    @SuppressWarnings("serial")
    protected class AccessibleJMenuItem extends AccessibleAbstractButton implements ChangeListener {

        private boolean isArmed = false;
        private boolean hasFocus = false;
        private boolean isPressed = false;
        private boolean isSelected = false;

        AccessibleJMenuItem() {
            super();
            JMenuItem.this.addChangeListener(this);
        }

        
Get the role of this object.

Returns:an instance of AccessibleRole describing the role of the
object
/**
         * Get the role of this object.
         *
         * @return an instance of AccessibleRole describing the role of the
         * object
         */
        public AccessibleRole getAccessibleRole() {
            return AccessibleRole.MENU_ITEM;
        }

        private void fireAccessibilityFocusedEvent(JMenuItem toCheck) {
            MenuElement [] path =
                MenuSelectionManager.defaultManager().getSelectedPath();
            if (path.length > 0) {
                Object menuItem = path[path.length - 1];
                if (toCheck == menuItem) {
                    firePropertyChange(
                        AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                        null, AccessibleState.FOCUSED);
                }
            }
        }

        
Supports the change listener interface and fires property changes.

/**
         * Supports the change listener interface and fires property changes.
         */
        public void stateChanged(ChangeEvent e) {
            firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY,
                               Boolean.valueOf(false), Boolean.valueOf(true));
            if (JMenuItem.this.getModel().isArmed()) {
                if (!isArmed) {
                    isArmed = true;
                    firePropertyChange(
                        AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                        null, AccessibleState.ARMED);
                    // Fix for 4848220 moved here to avoid major memory leak
                    // Here we will fire the event in case of JMenuItem
                    // See bug 4910323 for details [zav]
                    fireAccessibilityFocusedEvent(JMenuItem.this);
                }
            } else {
                if (isArmed) {
                    isArmed = false;
                    firePropertyChange(
                        AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                        AccessibleState.ARMED, null);
                }
            }
            if (JMenuItem.this.isFocusOwner()) {
                if (!hasFocus) {
                    hasFocus = true;
                    firePropertyChange(
                        AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                        null, AccessibleState.FOCUSED);
                }
            } else {
                if (hasFocus) {
                    hasFocus = false;
                    firePropertyChange(
                        AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                        AccessibleState.FOCUSED, null);
                }
            }
            if (JMenuItem.this.getModel().isPressed()) {
                if (!isPressed) {
                    isPressed = true;
                    firePropertyChange(
                        AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                        null, AccessibleState.PRESSED);
                }
            } else {
                if (isPressed) {
                    isPressed = false;
                    firePropertyChange(
                        AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                        AccessibleState.PRESSED, null);
                }
            }
            if (JMenuItem.this.getModel().isSelected()) {
                if (!isSelected) {
                    isSelected = true;
                    firePropertyChange(
                        AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                        null, AccessibleState.CHECKED);

                    // Fix for 4848220 moved here to avoid major memory leak
                    // Here we will fire the event in case of JMenu
                    // See bug 4910323 for details [zav]
                    fireAccessibilityFocusedEvent(JMenuItem.this);
                }
            } else {
                if (isSelected) {
                    isSelected = false;
                    firePropertyChange(
                        AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
                        AccessibleState.CHECKED, null);
                }
            }

        }
    } // inner class AccessibleJMenuItem


}