libjava/java/awt/MenuComponent.java

   1 /* MenuComponent.java -- Superclass of all AWT menu components
   2    Copyright (C) 1999, 2000, 2002, 2003 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., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 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.MenuComponentPeer;
  42 import java.io.Serializable;
  43
  44 // FIXME: Java 1.0 event model unimplemented
  45
  46 /**
  47   * This is the superclass of all non-menu AWT widgets.
  48   *
  49   * @author Aaron M. Renn (arenn@urbanophile.com)
  50   */
  51 public abstract class MenuComponent implements Serializable
  52 {
  53
  54 /*
  55  * Static Variables
  56  */
  57
  58 // Serialization Constant
  59 private static final long serialVersionUID = -4536902356223894379L;
  60
  61 /*************************************************************************/
  62
  63 /*
  64  * Instance Variables
  65  */
  66
  67   // FIXME: missing serialized fields `nameExplicitlySet',
  68   // `newEventsOnly', and `accessibleContext'.
  69
  70 // The font for this component
  71 private Font font;
  72
  73 // The name of the component
  74 private String name;
  75
  76 // The parent of this component
  77 transient MenuContainer parent;
  78
  79 // The native peer for this componet
  80 transient MenuComponentPeer peer;
  81
  82 // The synchronization locking object for this component
  83 private transient Object tree_lock = this;
  84
  85 // The toolkit for this object
  86 private static transient Toolkit toolkit = Toolkit.getDefaultToolkit();
  87
  88 /*************************************************************************/
  89
  90 /*
  91  * Constructors
  92  */
  93
  94 /**
  95   * Default constructor for subclasses.
  96   *
  97   * @exception HeadlessException If GraphicsEnvironment.isHeadless() is true.
  98   */
  99 public
 100 MenuComponent()
 101 {
 102   if (GraphicsEnvironment.isHeadless())
 103     throw new HeadlessException ();
 104 }
 105
 106 /*************************************************************************/
 107
 108 /*
 109  * Instance Methods
 110  */
 111
 112 /**
 113   * Returns the font in use for this component.
 114   *
 115   * @return The font for this component.
 116   */
 117 public Font
 118 getFont()
 119 {
 120   return(font);
 121 }
 122
 123 /*************************************************************************/
 124
 125 /**
 126   * Sets the font for this component to the specified font.
 127   *
 128   * @param font The new font for this component.
 129   */
 130 public void
 131 setFont(Font font)
 132 {
 133   this.font = font;
 134 }
 135
 136 /*************************************************************************/
 137
 138 /**
 139   * Returns the name of this component.
 140   *
 141   * @return The name of this component.
 142   */
 143 public String
 144 getName()
 145 {
 146   return(name);
 147 }
 148
 149 /*************************************************************************/
 150
 151 /**
 152   * Sets the name of this component to the specified name.
 153   *
 154   * @param name The new name of this component.
 155   */
 156 public void
 157 setName(String name)
 158 {
 159   this.name = name;
 160 }
 161
 162 /*************************************************************************/
 163
 164 /**
 165   * Returns the parent of this component.
 166   *
 167   * @return The parent of this component.
 168   */
 169 public MenuContainer
 170 getParent()
 171 {
 172   return(parent);
 173 }
 174
 175 /*************************************************************************/
 176
 177 // Sets the parent of this component.
 178 final void
 179 setParent(MenuContainer parent)
 180 {
 181   this.parent = parent;
 182 }
 183
 184 /*************************************************************************/
 185
 186 /**
 187   * Returns the native windowing system peer for this component.
 188   *
 189   * @return The peer for this component.
 190   *
 191   * @deprecated
 192   */
 193 public MenuComponentPeer
 194 getPeer()
 195 {
 196   return(peer);
 197 }
 198
 199 /*************************************************************************/
 200
 201 // Sets the peer for this component.
 202 final void
 203 setPeer(MenuComponentPeer peer)
 204 {
 205   this.peer = peer;
 206 }
 207
 208 /*************************************************************************/
 209
 210 /**
 211   * Destroys this component's native peer
 212   */
 213 public void
 214 removeNotify()
 215 {
 216   if (peer != null)
 217     peer.dispose();
 218   peer = null;
 219 }
 220
 221 /*************************************************************************/
 222
 223 /**
 224   * Returns the toolkit in use for this component.
 225   *
 226   * @return The toolkit for this component.
 227   */
 228 final Toolkit
 229 getToolkit()
 230 {
 231   return(toolkit);
 232 }
 233
 234 /*************************************************************************/
 235
 236 /**
 237   * Returns the object used for synchronization locks on this component
 238   * when performing tree and layout functions.
 239   *
 240   * @return The synchronization lock for this component.
 241   */
 242 protected final Object
 243 getTreeLock()
 244 {
 245   return(tree_lock);
 246 }
 247
 248 /*************************************************************************/
 249
 250 // The sync lock object for this component.
 251 final void
 252 setTreeLock(Object tree_lock)
 253 {
 254   this.tree_lock = tree_lock;
 255 }
 256
 257 /*************************************************************************/
 258
 259 /**
 260   * AWT 1.0 event dispatcher.
 261   *
 262   * @deprecated Deprecated in favor of <code>dispatchEvent()</code>.
 263   */
 264 public boolean
 265 postEvent(Event event)
 266 {
 267   return(false);
 268 }
 269
 270 /*************************************************************************/
 271
 272 /**
 273   * Sends this event to this component or a subcomponent for processing.
 274   *
 275   * @param event The event to dispatch
 276   */
 277 public final void
 278 dispatchEvent(AWTEvent event)
 279 {
 280   // See comment in Component.dispatchEvent().
 281   dispatchEventImpl(event);
 282 }
 283
 284 void
 285 dispatchEventImpl(AWTEvent e)
 286 {
 287   // This is overridden by subclasses that support events.
 288 }
 289
 290 /*************************************************************************/
 291
 292 /**
 293   * Processes the specified event.  In this class, this method simply
 294   * calls one of the more specific event handlers.
 295   *
 296   * @param event The event to process.
 297   */
 298 protected void
 299 processEvent(AWTEvent event)
 300 {
 301 }
 302
 303 /*************************************************************************/
 304
 305 /**
 306   * Returns a string representation of this component.
 307   *
 308   * @return A string representation of this component
 309   */
 310 public String
 311 toString()
 312 {
 313   return this.getClass().getName() + "[" + paramString() + "]";
 314 }
 315
 316 /*************************************************************************/
 317
 318 /**
 319   * Returns a debugging string for this component
 320   */
 321 protected String
 322 paramString()
 323 {
 324   return "name=" + getName();
 325 }
 326
 327 // Accessibility API not yet implemented.
 328 // public AccessibleContext getAccessibleContext()
 329
 330 } // class Component