001/* PopupMenu.java -- An AWT popup menu 002 Copyright (C) 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package java.awt; 040 041import java.awt.peer.PopupMenuPeer; 042 043import javax.accessibility.AccessibleContext; 044import javax.accessibility.AccessibleRole; 045 046/** 047 * This class implement an AWT popup menu widget 048 * 049 * @author Aaron M. Renn (arenn@urbanophile.com) 050 */ 051public 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 */ 078public 079PopupMenu() 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 */ 094public 095PopupMenu(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 */ 112public void 113addNotify() 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 */ 130public void 131show(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