old-autovect-branch/libjava/classpath/javax/swing/JCheckBoxMenuItem.java

   1 /* JCheckBoxMenuItem.java --
   2    Copyright (C) 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 javax.swing;
  40
  41 import javax.accessibility.Accessible;
  42 import javax.accessibility.AccessibleContext;
  43 import javax.accessibility.AccessibleRole;
  44
  45 /**
  46  * A menu item that displays a checkbox. Its behaviour is very similar
  47  * to {@link JCheckBox}. Just like the <code>JCheckBox</code>, user can check
  48  * and uncheck this menu item by clicking on it. Also
  49  * {@link AbstractButton#setSelected} and {@link #setState} can be use used
  50  * for the same purpose.
  51  * <code>JCheckBoxMenuItem</code> uses
  52  * <code>ToggleButtonModel</code> to keep track of its selection.
  53  *
  54  * @author original author unknown
  55  */
  56 public class JCheckBoxMenuItem extends JMenuItem implements SwingConstants,
  57                                                             Accessible
  58 {
  59   private static final long serialVersionUID = -6676402307973384715L;
  60
  61   /** name for the UI delegate for this menuItem. */
  62   private static final String uiClassID = "CheckBoxMenuItemUI";
  63
  64   /** Indicates whether this menu item is checked. */
  65   private boolean state;
  66
  67   /**
  68    * This array contains text of this menu item if this menu item is in
  69    * checked state and null it is not.
  70    */
  71   private Object[] selectedObjects = new Object[1];
  72
  73   /**
  74    * Creates a new JCheckBoxMenuItem object.
  75    */
  76   public JCheckBoxMenuItem()
  77   {
  78     this(null, null);
  79   }
  80
  81   /**
  82    * Creates a new JCheckBoxMenuItem with given icon
  83    *
  84    * @param icon Icon for this menu item
  85    */
  86   public JCheckBoxMenuItem(Icon icon)
  87   {
  88     this(null, icon);
  89   }
  90
  91   /**
  92    * Creates a new JCheckBoxMenuItem with given label
  93    *
  94    * @param text Label for this menu item
  95    */
  96   public JCheckBoxMenuItem(String text)
  97   {
  98     this(text, null);
  99   }
 100
 101   /**
 102    * Creates a new JCheckBoxMenuItem using given action
 103    *
 104    * @param action Action for this menu item.
 105    */
 106   public JCheckBoxMenuItem(Action action)
 107   {
 108     this();
 109     setAction(action);
 110   }
 111
 112   /**
 113    * Creates a new JCheckBoxMenuItem object with given label and icon
 114    *
 115    * @param text Label for this menu item
 116    * @param icon Icon for this menu item
 117    */
 118   public JCheckBoxMenuItem(String text, Icon icon)
 119   {
 120     this(text, icon, false);
 121   }
 122
 123   /**
 124    * Creates a new JCheckBoxMenuItem object using specified label and
 125    * marked as checked if given 'state' is true.
 126    *
 127    * @param text Label for this menu item
 128    * @param state <code>true</code> if this item should be in checked state and
 129    *     <code>false</code> otherwise
 130    */
 131   public JCheckBoxMenuItem(String text, boolean state)
 132   {
 133     this(text, null, state);
 134   }
 135
 136   /**
 137    * Creates a new JCheckBoxMenuItem object with given label, icon,
 138    * and marked as checked if given 'state' is true.
 139    *
 140    * @param text Label for this menu item
 141    * @param icon icon for this menu item
 142    * @param state <code>true</code> if this item should be in checked state and
 143    *     false otherwise
 144    */
 145   public JCheckBoxMenuItem(String text, Icon icon, boolean state)
 146   {
 147     super(text, icon);
 148     setModel(new JToggleButton.ToggleButtonModel());
 149     this.state = state;
 150     this.setVisible(true);
 151   }
 152
 153   /**
 154    * This method returns a name to identify which look and feel class will be
 155    * the UI delegate for the menuItem.
 156    *
 157    * @return The Look and Feel classID. "JCheckBoxMenuItemUI"
 158    */
 159   public String getUIClassID()
 160   {
 161     return uiClassID;
 162   }
 163
 164   /**
 165    * Returns checked state for this check box menu item.
 166    *
 167    * @return Returns true if this menu item is in checked state
 168    * and false otherwise.
 169    */
 170   public boolean getState()
 171   {
 172     return state;
 173   }
 174
 175   /**
 176    * Sets state for this check box menu item. If
 177    * given 'state' is true, then mark menu item as checked,
 178    * and uncheck this menu item otherwise.
 179    *
 180    * @param state new state for this menu item
 181    */
 182   public synchronized void setState(boolean state)
 183   {
 184     this.state = state;
 185   }
 186
 187   /**
 188    * This method returns array containing label of this
 189    * menu item if it is selected and null otherwise.
 190    *
 191    * @return Array containing label of this
 192    *     menu item if this menu item is selected or null otherwise.
 193    */
 194   public Object[] getSelectedObjects()
 195   {
 196     if (state == true)
 197       selectedObjects[0] = this.getText();
 198     else
 199       selectedObjects[0] = null;
 200
 201     return selectedObjects;
 202   }
 203
 204   /**
 205     * This method overrides JComponent.requestFocus with an empty
 206     * implementation, since JCheckBoxMenuItems should not
 207     * receve focus in general.
 208     */
 209   public void requestFocus()
 210   {
 211     //  Should do nothing here
 212   }
 213
 214   /**
 215    * A string that describes this JCheckBoxMenuItem. Normally only used
 216    * for debugging.
 217    *
 218    * @return A string describing this JCheckBoxMenuItem
 219    */
 220   protected String paramString()
 221   {
 222     return "JCheckBoxMenuItem";
 223   }
 224
 225   public AccessibleContext getAccessibleContext()
 226   {
 227     if (accessibleContext == null)
 228       accessibleContext = new AccessibleJCheckBoxMenuItem();
 229
 230     return accessibleContext;
 231   }
 232
 233   /**
 234    * Accessibility support for <code>JCheckBoxMenuItem</code>.
 235    */
 236   protected class AccessibleJCheckBoxMenuItem extends AccessibleJMenuItem
 237   {
 238     private static final long serialVersionUID = 1079958073579370777L;
 239
 240     /**
 241      * Creates a new AccessibleJCheckBoxMenuItem object.
 242      */
 243     protected AccessibleJCheckBoxMenuItem()
 244     {
 245       // Nothing to do here.
 246     }
 247
 248     public AccessibleRole getAccessibleRole()
 249     {
 250       return AccessibleRole.CHECK_BOX;
 251     }
 252   }
 253 }