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protected class

JSeparator.AccessibleJSeparator

extends JComponent.AccessibleJComponent
/*
 * Copyright (c) 1997, 2006, 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 javax.swing.plaf.*;
import javax.accessibility.*;

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


/**
 * <code>JSeparator</code> provides a general purpose component for
 * implementing divider lines - most commonly used as a divider
 * between menu items that breaks them up into logical groupings.
 * Instead of using <code>JSeparator</code> directly,
 * you can use the <code>JMenu</code> or <code>JPopupMenu</code>
 * <code>addSeparator</code> method to create and add a separator.
 * <code>JSeparator</code>s may also be used elsewhere in a GUI
 * wherever a visual divider is useful.
 *
 * <p>
 *
 * For more information and examples 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 divider between menu items.
 *
 * @author Georges Saab
 * @author Jeff Shapiro
 */

public class JSeparator extends JComponent implements SwingConstants, Accessible
{
   
/**
     * @see #getUIClassID
     * @see #readObject
     */

   
private static final String uiClassID = "SeparatorUI";

   
private int orientation = HORIZONTAL;

   
/** Creates a new horizontal separator. */
   
public JSeparator()
   
{
       
this( HORIZONTAL );
   
}

   
/**
     * Creates a new separator with the specified horizontal or
     * vertical orientation.
     *
     * @param orientation an integer specifying
     *          <code>SwingConstants.HORIZONTAL</code> or
     *          <code>SwingConstants.VERTICAL</code>
     * @exception IllegalArgumentException if <code>orientation</code>
     *          is neither <code>SwingConstants.HORIZONTAL</code> nor
     *          <code>SwingConstants.VERTICAL</code>
     */

   
public JSeparator( int orientation )
   
{
        checkOrientation
( orientation );
       
this.orientation = orientation;
        setFocusable
(false);
        updateUI
();
   
}

   
/**
     * Returns the L&F object that renders this component.
     *
     * @return the SeparatorUI object that renders this component
     */

   
public SeparatorUI getUI() {
       
return (SeparatorUI)ui;
   
}

   
/**
     * Sets the L&F object that renders this component.
     *
     * @param ui  the SeparatorUI L&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(SeparatorUI ui) {
       
super.setUI(ui);
   
}

   
/**
     * Resets the UI property to a value from the current look and feel.
     *
     * @see JComponent#updateUI
     */

   
public void updateUI() {
        setUI
((SeparatorUI)UIManager.getUI(this));
   
}


   
/**
     * Returns the name of the L&F class that renders this component.
     *
     * @return the string "SeparatorUI"
     * @see JComponent#getUIClassID
     * @see UIDefaults#getUI
     */

   
public String getUIClassID() {
       
return uiClassID;
   
}


   
/**
     * See <code>readObject</code> and <code>writeObject</code> in
     * <code>JComponent</code> 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 the orientation of this separator.
     *
     * @return   The value of the orientation property, one of the
     *           following constants defined in <code>SwingConstants</code>:
     *           <code>VERTICAL</code>, or
     *           <code>HORIZONTAL</code>.
     *
     * @see SwingConstants
     * @see #setOrientation
     */

   
public int getOrientation() {
       
return this.orientation;
   
}

   
/**
     * Sets the orientation of the separator.
     * The default value of this property is HORIZONTAL.
     * @param orientation  either <code>SwingConstants.HORIZONTAL</code>
     *                  or <code>SwingConstants.VERTICAL</code>
     * @exception IllegalArgumentException  if <code>orientation</code>
     *          is neither <code>SwingConstants.HORIZONTAL</code>
     *          nor <code>SwingConstants.VERTICAL</code>
     *
     * @see SwingConstants
     * @see #getOrientation
     * @beaninfo
     *        bound: true
     *    preferred: true
     *         enum: HORIZONTAL SwingConstants.HORIZONTAL
     *               VERTICAL   SwingConstants.VERTICAL
     *    attribute: visualUpdate true
     *  description: The orientation of the separator.
     */

   
public void setOrientation( int orientation ) {
       
if (this.orientation == orientation) {
           
return;
       
}
       
int oldValue = this.orientation;
        checkOrientation
( orientation );
       
this.orientation = orientation;
        firePropertyChange
("orientation", oldValue, orientation);
        revalidate
();
        repaint
();
   
}

   
private void checkOrientation( int orientation )
   
{
       
switch ( orientation )
       
{
           
case VERTICAL:
           
case HORIZONTAL:
               
break;
           
default:
               
throw new IllegalArgumentException( "orientation must be one of: VERTICAL, HORIZONTAL" );
       
}
   
}


   
/**
     * Returns a string representation of this <code>JSeparator</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>JSeparator</code>
     */

   
protected String paramString() {
       
String orientationString = (orientation == HORIZONTAL ?
                                   
"HORIZONTAL" : "VERTICAL");

       
return super.paramString() +
       
",orientation=" + orientationString;
   
}

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

   
/**
     * Gets the AccessibleContext associated with this JSeparator.
     * For separators, the AccessibleContext takes the form of an
     * AccessibleJSeparator.
     * A new AccessibleJSeparator instance is created if necessary.
     *
     * @return an AccessibleJSeparator that serves as the
     *         AccessibleContext of this JSeparator
     */

   
public AccessibleContext getAccessibleContext() {
       
if (accessibleContext == null) {
            accessibleContext
= new AccessibleJSeparator();
       
}
       
return accessibleContext;
   
}

   
/**
     * This class implements accessibility support for the
     * <code>JSeparator</code> class.  It provides an implementation of the
     * Java Accessibility API appropriate to separator 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 AccessibleJSeparator extends AccessibleJComponent {

       
/**
         * Get the role of this object.
         *
         * @return an instance of AccessibleRole describing the role of the
         * object
         */

       
public AccessibleRole getAccessibleRole() {
           
return AccessibleRole.SEPARATOR;
       
}
   
}
}