1 /* PopupMenu.java -- An AWT popup menu
2 Copyright (C) 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
3
4 This file is part of GNU Classpath.
5
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
20
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
37
38
39 package java.awt;
40
41 import java.awt.peer.PopupMenuPeer;
42
43 import javax.accessibility.AccessibleContext;
44 import javax.accessibility.AccessibleRole;
45
46 /**
47 * This class implement an AWT popup menu widget
48 *
49 * @author Aaron M. Renn (arenn@urbanophile.com)
50 */
51 public class PopupMenu extends Menu
52 {
53
54 /*
55 * Static Variables
56 */
57
58 /**
59 * The number used to generate the name returned by getName.
60 */
61 private static transient long next_popup_number;
62
63 // Serialization Constant
64 private static final long serialVersionUID = - 4620452533522760060L;
65
66 /*************************************************************************/
67
68 /*
69 * Constructors
70 */
71
72 /**
73 * Initializes a new instance of <code>PopupMenu</code>.
74 *
75 * @exception HeadlessException If GraphicsEnvironment.isHeadless()
76 * returns true.
77 */
78 public
PopupMenu()79 PopupMenu()
80 {
81 }
82
83 /*************************************************************************/
84
85 /**
86 * Initializes a new instance of <code>PopupMenu</code> with the specified
87 * label.
88 *
89 * @param label The label for this popup menu.
90 *
91 * @exception HeadlessException If GraphicsEnvironment.isHeadless()
92 * returns true.
93 */
94 public
PopupMenu(String label)95 PopupMenu(String label)
96 {
97 super(label);
98
99 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
addNotify()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
show(Component component, int x, int y)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
AccessibleAWTPopupMenu()150 protected AccessibleAWTPopupMenu()
151 {
152 }
153
getAccessibleRole()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 */
getAccessibleContext()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 */
generateName()180 String generateName()
181 {
182 return "popup" + getUniqueLong();
183 }
184
getUniqueLong()185 private static synchronized long getUniqueLong()
186 {
187 return next_popup_number++;
188 }
189
190 } // class PopupMenu
191