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