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 * Copyright (c) 1997, 2006, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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
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 *
 * 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).
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 * 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
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package javax.swing;

import java.util.EventListener;

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

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

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



A menu item that can be selected or deselected. If selected, the menu
item typically appears with a checkmark next to it. If unselected or
deselected, the menu item appears without a checkmark. Like a regular
menu item, a check box menu item can have either text or a graphic
icon associated with it, or both.


Either isSelected/setSelected or
getState/setState can be used
to determine/specify the menu item's selection state. The
preferred methods are isSelected and
setSelected, which work for all menus and buttons.
The getState and setState methods exist for
compatibility with other component sets.


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 information and examples of using check box menu items,
see How to Use Menus,
a section 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 JavaBeansTM
has been added to the java.beans package. Please see XMLEncoder. 
Author:Georges Saab, David Karlton
@beaninfo
  attribute: isContainer false
description: A menu item which can be selected or deselected.
/**
 * A menu item that can be selected or deselected. If selected, the menu
 * item typically appears with a checkmark next to it. If unselected or
 * deselected, the menu item appears without a checkmark. Like a regular
 * menu item, a check box menu item can have either text or a graphic
 * icon associated with it, or both.
 * <p>
 * Either <code>isSelected</code>/<code>setSelected</code> or
 * <code>getState</code>/<code>setState</code> can be used
 * to determine/specify the menu item's selection state. The
 * preferred methods are <code>isSelected</code> and
 * <code>setSelected</code>, which work for all menus and buttons.
 * The <code>getState</code> and <code>setState</code> methods exist for
 * compatibility with other component sets.
 * <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="http://java.sun.com/docs/books/tutorial/uiswing/misc/action.html">How
 * to Use Actions</a>, a section in <em>The Java Tutorial</em>.
 * <p>
 * For further information and examples of using check box menu items,
 * see <a
 href="http://java.sun.com/docs/books/tutorial/uiswing/components/menu.html">How to Use Menus</a>,
 * a section 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<sup><font size="-2">TM</font></sup>
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @beaninfo
 *   attribute: isContainer false
 * description: A menu item which can be selected or deselected.
 *
 * @author Georges Saab
 * @author David Karlton
 */
public class JCheckBoxMenuItem extends JMenuItem implements SwingConstants,
        Accessible
{
    
See Also:
/**
     * @see #getUIClassID
     * @see #readObject
     */
    private static final String uiClassID = "CheckBoxMenuItemUI";

    
Creates an initially unselected check box menu item with no set text or icon.

/**
     * Creates an initially unselected check box menu item with no set text or icon.
     */
    public JCheckBoxMenuItem() {
        this(null, null, false);
    }

    
Creates an initially unselected check box menu item with an icon.

Params:
  • icon – the icon of the CheckBoxMenuItem.
/**
     * Creates an initially unselected check box menu item with an icon.
     *
     * @param icon the icon of the CheckBoxMenuItem.
     */
    public JCheckBoxMenuItem(Icon icon) {
        this(null, icon, false);
    }

    
Creates an initially unselected check box menu item with text.

Params:
  • text – the text of the CheckBoxMenuItem
/**
     * Creates an initially unselected check box menu item with text.
     *
     * @param text the text of the CheckBoxMenuItem
     */
    public JCheckBoxMenuItem(String text) {
        this(text, null, false);
    }

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

Since:1.3
/**
     * Creates a menu item whose properties are taken from the
     * Action supplied.
     *
     * @since 1.3
     */
    public JCheckBoxMenuItem(Action a) {
        this();
        setAction(a);
    }

    
Creates an initially unselected check box menu item with the specified text and icon.

Params:
  • text – the text of the CheckBoxMenuItem
  • icon – the icon of the CheckBoxMenuItem
/**
     * Creates an initially unselected check box menu item with the specified text and icon.
     *
     * @param text the text of the CheckBoxMenuItem
     * @param icon the icon of the CheckBoxMenuItem
     */
    public JCheckBoxMenuItem(String text, Icon icon) {
        this(text, icon, false);
    }

    
Creates a check box menu item with the specified text and selection state.

Params:
  • text – the text of the check box menu item.
  • b – the selected state of the check box menu item
/**
     * Creates a check box menu item with the specified text and selection state.
     *
     * @param text the text of the check box menu item.
     * @param b the selected state of the check box menu item
     */
    public JCheckBoxMenuItem(String text, boolean b) {
        this(text, null, b);
    }

    
Creates a check box menu item with the specified text, icon, and selection state.

Params:
  • text – the text of the check box menu item
  • icon – the icon of the check box menu item
  • b – the selected state of the check box menu item
/**
     * Creates a check box menu item with the specified text, icon, and selection state.
     *
     * @param text the text of the check box menu item
     * @param icon the icon of the check box menu item
     * @param b the selected state of the check box menu item
     */
    public JCheckBoxMenuItem(String text, Icon icon, boolean b) {
        super(text, icon);
        setModel(new JToggleButton.ToggleButtonModel());
        setSelected(b);
        setFocusable(false);
    }

    
Returns the name of the L&F class
that renders this component.

See Also:
Returns:"CheckBoxMenuItemUI"
/**
     * Returns the name of the L&F class
     * that renders this component.
     *
     * @return "CheckBoxMenuItemUI"
     * @see JComponent#getUIClassID
     * @see UIDefaults#getUI
     */
    public String getUIClassID() {
        return uiClassID;
    }

     
Returns the selected-state of the item. This method
exists for AWT compatibility only.  New code should
use isSelected() instead.

Returns:true  if the item is selected
/**
      * Returns the selected-state of the item. This method
      * exists for AWT compatibility only.  New code should
      * use isSelected() instead.
      *
      * @return true  if the item is selected
      */
    public boolean getState() {
        return isSelected();
    }

    
Sets the selected-state of the item. This method
exists for AWT compatibility only.  New code should
use setSelected() instead.

Params:
  • b –  a boolean value indicating the item's
          selected-state, where true=selected
@beaninfo
description: The selection state of the check box menu item
     hidden: true
/**
     * Sets the selected-state of the item. This method
     * exists for AWT compatibility only.  New code should
     * use setSelected() instead.
     *
     * @param b  a boolean value indicating the item's
     *           selected-state, where true=selected
     * @beaninfo
     * description: The selection state of the check box menu item
     *      hidden: true
     */
    public synchronized void setState(boolean b) {
        setSelected(b);
    }


    
Returns an array (length 1) containing the check box menu item
label or null if the check box is not selected.

Returns:an array containing one Object -- the text of the menu item
        -- if the item is selected; otherwise null
/**
     * Returns an array (length 1) containing the check box menu item
     * label or null if the check box is not selected.
     *
     * @return an array containing one Object -- the text of the menu item
     *         -- if the item is selected; otherwise null
     */
    public Object[] getSelectedObjects() {
        if (isSelected() == false)
            return null;
        Object[] selectedObjects = new Object[1];
        selectedObjects[0] = getText();
        return selectedObjects;
    }

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

/**
     * See readObject() and writeObject() in JComponent for more
     * information about serialization in Swing.
     */
    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 JCheckBoxMenuItem. 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 JCheckBoxMenuItem.
/**
     * Returns a string representation of this JCheckBoxMenuItem. 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 JCheckBoxMenuItem.
     */
    protected String paramString() {
        return super.paramString();
    }

    
Overriden to return true, JCheckBoxMenuItem supports
the selected state.

/**
     * Overriden to return true, JCheckBoxMenuItem supports
     * the selected state.
     */
    boolean shouldUpdateSelectedStateFromAction() {
        return true;
    }

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

    
Gets the AccessibleContext associated with this JCheckBoxMenuItem.
For JCheckBoxMenuItems, the AccessibleContext takes the form of an
AccessibleJCheckBoxMenuItem.
A new AccessibleJCheckBoxMenuItem instance is created if necessary.

Returns:an AccessibleJCheckBoxMenuItem that serves as the
        AccessibleContext of this AccessibleJCheckBoxMenuItem
/**
     * Gets the AccessibleContext associated with this JCheckBoxMenuItem.
     * For JCheckBoxMenuItems, the AccessibleContext takes the form of an
     * AccessibleJCheckBoxMenuItem.
     * A new AccessibleJCheckBoxMenuItem instance is created if necessary.
     *
     * @return an AccessibleJCheckBoxMenuItem that serves as the
     *         AccessibleContext of this AccessibleJCheckBoxMenuItem
     */
    public AccessibleContext getAccessibleContext() {
        if (accessibleContext == null) {
            accessibleContext = new AccessibleJCheckBoxMenuItem();
        }
        return accessibleContext;
    }

    
This class implements accessibility support for the
JCheckBoxMenuItem class.  It provides an implementation
of the Java Accessibility API appropriate to checkbox 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 JavaBeansTM
has been added to the java.beans package. Please see XMLEncoder. 
/**
     * This class implements accessibility support for the
     * <code>JCheckBoxMenuItem</code> class.  It provides an implementation
     * of the Java Accessibility API appropriate to checkbox 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<sup><font size="-2">TM</font></sup>
     * has been added to the <code>java.beans</code> package.
     * Please see {@link java.beans.XMLEncoder}.
     */
    protected class AccessibleJCheckBoxMenuItem extends AccessibleJMenuItem {
        
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.CHECK_BOX;
        }
    } // inner class AccessibleJCheckBoxMenuItem
}