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