J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1996-2006 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package java.awt; |
| 27 | |
| 28 | import java.awt.peer.PopupMenuPeer; |
| 29 | import javax.accessibility.*; |
| 30 | |
| 31 | |
| 32 | /** |
| 33 | * A class that implements a menu which can be dynamically popped up |
| 34 | * at a specified position within a component. |
| 35 | * <p> |
| 36 | * As the inheritance hierarchy implies, a <code>PopupMenu</code> |
| 37 | * can be used anywhere a <code>Menu</code> can be used. |
| 38 | * However, if you use a <code>PopupMenu</code> like a <code>Menu</code> |
| 39 | * (e.g., you add it to a <code>MenuBar</code>), then you <b>cannot</b> |
| 40 | * call <code>show</code> on that <code>PopupMenu</code>. |
| 41 | * |
| 42 | * @author Amy Fowler |
| 43 | */ |
| 44 | public class PopupMenu extends Menu { |
| 45 | |
| 46 | private static final String base = "popup"; |
| 47 | static int nameCounter = 0; |
| 48 | |
| 49 | transient boolean isTrayIconPopup = false; |
| 50 | |
| 51 | /* |
| 52 | * JDK 1.1 serialVersionUID |
| 53 | */ |
| 54 | private static final long serialVersionUID = -4620452533522760060L; |
| 55 | |
| 56 | /** |
| 57 | * Creates a new popup menu with an empty name. |
| 58 | * @exception HeadlessException if GraphicsEnvironment.isHeadless() |
| 59 | * returns true. |
| 60 | * @see java.awt.GraphicsEnvironment#isHeadless |
| 61 | */ |
| 62 | public PopupMenu() throws HeadlessException { |
| 63 | this(""); |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * Creates a new popup menu with the specified name. |
| 68 | * |
| 69 | * @param label a non-<code>null</code> string specifying |
| 70 | * the popup menu's label |
| 71 | * @exception HeadlessException if GraphicsEnvironment.isHeadless() |
| 72 | * returns true. |
| 73 | * @see java.awt.GraphicsEnvironment#isHeadless |
| 74 | */ |
| 75 | public PopupMenu(String label) throws HeadlessException { |
| 76 | super(label); |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * {@inheritDoc} |
| 81 | */ |
| 82 | public MenuContainer getParent() { |
| 83 | if (isTrayIconPopup) { |
| 84 | return null; |
| 85 | } |
| 86 | return super.getParent(); |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * Constructs a name for this <code>MenuComponent</code>. |
| 91 | * Called by <code>getName</code> when the name is <code>null</code>. |
| 92 | */ |
| 93 | String constructComponentName() { |
| 94 | synchronized (PopupMenu.class) { |
| 95 | return base + nameCounter++; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * Creates the popup menu's peer. |
| 101 | * The peer allows us to change the appearance of the popup menu without |
| 102 | * changing any of the popup menu's functionality. |
| 103 | */ |
| 104 | public void addNotify() { |
| 105 | synchronized (getTreeLock()) { |
| 106 | // If our parent is not a Component, then this PopupMenu is |
| 107 | // really just a plain, old Menu. |
| 108 | if (parent != null && !(parent instanceof Component)) { |
| 109 | super.addNotify(); |
| 110 | } |
| 111 | else { |
| 112 | if (peer == null) |
| 113 | peer = Toolkit.getDefaultToolkit().createPopupMenu(this); |
| 114 | int nitems = getItemCount(); |
| 115 | for (int i = 0 ; i < nitems ; i++) { |
| 116 | MenuItem mi = getItem(i); |
| 117 | mi.parent = this; |
| 118 | mi.addNotify(); |
| 119 | } |
| 120 | } |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Shows the popup menu at the x, y position relative to an origin |
| 126 | * component. |
| 127 | * The origin component must be contained within the component |
| 128 | * hierarchy of the popup menu's parent. Both the origin and the parent |
| 129 | * must be showing on the screen for this method to be valid. |
| 130 | * <p> |
| 131 | * If this <code>PopupMenu</code> is being used as a <code>Menu</code> |
| 132 | * (i.e., it has a non-<code>Component</code> parent), |
| 133 | * then you cannot call this method on the <code>PopupMenu</code>. |
| 134 | * |
| 135 | * @param origin the component which defines the coordinate space |
| 136 | * @param x the x coordinate position to popup the menu |
| 137 | * @param y the y coordinate position to popup the menu |
| 138 | * @exception NullPointerException if the parent is <code>null</code> |
| 139 | * @exception IllegalArgumentException if this <code>PopupMenu</code> |
| 140 | * has a non-<code>Component</code> parent |
| 141 | * @exception IllegalArgumentException if the origin is not in the |
| 142 | * parent's heirarchy |
| 143 | * @exception RuntimeException if the parent is not showing on screen |
| 144 | */ |
| 145 | public void show(Component origin, int x, int y) { |
| 146 | // Use localParent for thread safety. |
| 147 | MenuContainer localParent = parent; |
| 148 | if (localParent == null) { |
| 149 | throw new NullPointerException("parent is null"); |
| 150 | } |
| 151 | if (!(localParent instanceof Component)) { |
| 152 | throw new IllegalArgumentException( |
| 153 | "PopupMenus with non-Component parents cannot be shown"); |
| 154 | } |
| 155 | Component compParent = (Component)localParent; |
| 156 | //Fixed 6278745: Incorrect exception throwing in PopupMenu.show() method |
| 157 | //Exception was not thrown if compParent was not equal to origin and |
| 158 | //was not Container |
| 159 | if (compParent != origin) { |
| 160 | if (compParent instanceof Container) { |
| 161 | if (!((Container)compParent).isAncestorOf(origin)) { |
| 162 | throw new IllegalArgumentException("origin not in parent's hierarchy"); |
| 163 | } |
| 164 | } else { |
| 165 | throw new IllegalArgumentException("origin not in parent's hierarchy"); |
| 166 | } |
| 167 | } |
| 168 | if (compParent.getPeer() == null || !compParent.isShowing()) { |
| 169 | throw new RuntimeException("parent not showing on screen"); |
| 170 | } |
| 171 | if (peer == null) { |
| 172 | addNotify(); |
| 173 | } |
| 174 | synchronized (getTreeLock()) { |
| 175 | if (peer != null) { |
| 176 | ((PopupMenuPeer)peer).show( |
| 177 | new Event(origin, 0, Event.MOUSE_DOWN, x, y, 0, 0)); |
| 178 | } |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | |
| 183 | ///////////////// |
| 184 | // Accessibility support |
| 185 | //////////////// |
| 186 | |
| 187 | /** |
| 188 | * Gets the <code>AccessibleContext</code> associated with this |
| 189 | * <code>PopupMenu</code>. |
| 190 | * |
| 191 | * @return the <code>AccessibleContext</code> of this |
| 192 | * <code>PopupMenu</code> |
| 193 | * @since 1.3 |
| 194 | */ |
| 195 | public AccessibleContext getAccessibleContext() { |
| 196 | if (accessibleContext == null) { |
| 197 | accessibleContext = new AccessibleAWTPopupMenu(); |
| 198 | } |
| 199 | return accessibleContext; |
| 200 | } |
| 201 | |
| 202 | /** |
| 203 | * Inner class of PopupMenu used to provide default support for |
| 204 | * accessibility. This class is not meant to be used directly by |
| 205 | * application developers, but is instead meant only to be |
| 206 | * subclassed by menu component developers. |
| 207 | * <p> |
| 208 | * The class used to obtain the accessible role for this object. |
| 209 | * @since 1.3 |
| 210 | */ |
| 211 | protected class AccessibleAWTPopupMenu extends AccessibleAWTMenu |
| 212 | { |
| 213 | /* |
| 214 | * JDK 1.3 serialVersionUID |
| 215 | */ |
| 216 | private static final long serialVersionUID = -4282044795947239955L; |
| 217 | |
| 218 | /** |
| 219 | * Get the role of this object. |
| 220 | * |
| 221 | * @return an instance of AccessibleRole describing the role of the |
| 222 | * object |
| 223 | */ |
| 224 | public AccessibleRole getAccessibleRole() { |
| 225 | return AccessibleRole.POPUP_MENU; |
| 226 | } |
| 227 | |
| 228 | } // class AccessibleAWTPopupMenu |
| 229 | |
| 230 | } |