001    /* PopupMenu.java -- An AWT popup menu
002       Copyright (C) 1999, 2000, 2001, 2002, 2004  Free Software Foundation, Inc.
003    
004    This file is part of GNU Classpath.
005    
006    GNU Classpath is free software; you can redistribute it and/or modify
007    it under the terms of the GNU General Public License as published by
008    the Free Software Foundation; either version 2, or (at your option)
009    any later version.
010    
011    GNU Classpath is distributed in the hope that it will be useful, but
012    WITHOUT ANY WARRANTY; without even the implied warranty of
013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014    General Public License for more details.
015    
016    You should have received a copy of the GNU General Public License
017    along with GNU Classpath; see the file COPYING.  If not, write to the
018    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019    02110-1301 USA.
020    
021    Linking this library statically or dynamically with other modules is
022    making a combined work based on this library.  Thus, the terms and
023    conditions of the GNU General Public License cover the whole
024    combination.
025    
026    As a special exception, the copyright holders of this library give you
027    permission to link this library with independent modules to produce an
028    executable, regardless of the license terms of these independent
029    modules, and to copy and distribute the resulting executable under
030    terms of your choice, provided that you also meet, for each linked
031    independent module, the terms and conditions of the license of that
032    module.  An independent module is a module which is not derived from
033    or based on this library.  If you modify this library, you may extend
034    this exception to your version of the library, but you are not
035    obligated to do so.  If you do not wish to do so, delete this
036    exception statement from your version. */
037    
038    
039    package java.awt;
040    
041    import java.awt.peer.PopupMenuPeer;
042    
043    import javax.accessibility.AccessibleContext;
044    import javax.accessibility.AccessibleRole;
045    
046    /**
047      * This class implement an AWT popup menu widget
048      *
049      * @author Aaron M. Renn (arenn@urbanophile.com)
050      */
051    public class PopupMenu extends Menu
052    {
053    
054    /*
055     * Static Variables
056     */
057    
058      /**
059       * The number used to generate the name returned by getName.
060       */
061      private static transient long next_popup_number;
062    
063      // Serialization Constant
064      private static final long serialVersionUID = - 4620452533522760060L;
065    
066    /*************************************************************************/
067    
068    /*
069     * Constructors
070     */
071    
072    /**
073      * Initializes a new instance of <code>PopupMenu</code>.
074      *
075      * @exception HeadlessException If GraphicsEnvironment.isHeadless()
076      * returns true.
077      */
078    public
079    PopupMenu()
080    {
081    }
082    
083    /*************************************************************************/
084    
085    /**
086      * Initializes a new instance of <code>PopupMenu</code> with the specified
087      * label.
088      *
089      * @param label The label for this popup menu.
090      *
091      * @exception HeadlessException If GraphicsEnvironment.isHeadless()
092      * returns true.
093      */
094    public
095    PopupMenu(String label)
096    {
097      super(label);
098    
099      if (GraphicsEnvironment.isHeadless())
100        throw new HeadlessException ();
101    }
102    
103    /*************************************************************************/
104    
105    /*
106     * Instance Methods
107     */
108    
109    /**
110      * Creates this object's native peer.
111      */
112    public void
113    addNotify()
114    {
115      if (peer == null)
116        peer = getToolkit ().createPopupMenu (this);
117      super.addNotify ();
118    }
119    
120    /*************************************************************************/
121    
122    /**
123      * Displays this popup menu at the specified coordinates relative to
124      * the specified component.
125      *
126      * @param component The component to which the display coordinates are relative.
127      * @param x The X coordinate of the menu.
128      * @param y The Y coordinate of the menu.
129      */
130    public void
131    show(Component component, int x, int y)
132    {
133      if (getPeer() == null)
134        this.addNotify();
135      PopupMenuPeer pmp = (PopupMenuPeer)getPeer();
136      if (pmp != null)
137        {
138          /* XXX
139          Event e = new Event (component, Event.ACTION_EVENT, component);
140          e.x = x;
141          e.y = y;*/
142          pmp.show (component, x, y);
143        }
144    }
145    
146      protected class AccessibleAWTPopupMenu extends AccessibleAWTMenu
147      {
148        private static final long serialVersionUID = -4282044795947239955L;
149    
150        protected AccessibleAWTPopupMenu()
151        {
152        }
153        
154        public AccessibleRole getAccessibleRole()
155        {
156          return AccessibleRole.POPUP_MENU;
157        }
158        
159      }
160      
161      /**
162       * Gets the AccessibleContext associated with this <code>PopupMenu</code>.
163       * The context is created, if necessary.
164       *
165       * @return the associated context
166       */
167      public AccessibleContext getAccessibleContext()
168      {
169        /* Create the context if this is the first request */
170        if (accessibleContext == null)
171          accessibleContext = new AccessibleAWTPopupMenu();
172        return accessibleContext;
173      }
174      
175      /**
176       * Generate a unique name for this <code>PopupMenu</code>.
177       *
178       * @return A unique name for this <code>PopupMenu</code>.
179       */
180      String generateName()
181      {
182        return "popup" + getUniqueLong();
183      }
184    
185      private static synchronized long getUniqueLong()
186      {
187        return next_popup_number++;
188      }
189    
190    } // class PopupMenu
191