libjava/java/awt/MenuShortcut.java

   1 /* MenuShortcut.java -- A class for menu accelerators
   2    Copyright (C) 1999, 2002 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 /**
  42   * This class implements a keyboard accelerator for a menu item.
  43   *
  44   * @author Aaron M. Renn (arenn@urbanophile.com)
  45   */
  46 public class MenuShortcut implements java.io.Serializable
  47 {
  48
  49 /*
  50  * Static Variables
  51  */
  52
  53 // Serialization Constant
  54 private static final long serialVersionUID = 143448358473180225L;
  55
  56 /*************************************************************************/
  57
  58 /*
  59  * Instance Variables
  60  */
  61
  62 /**
  63   * @serial The virtual keycode for the shortcut.
  64   */
  65 private int key;
  66
  67 /**
  68   * @serial <code>true</code> if the shift key was used with this shortcut,
  69   * or <code>false</code> otherwise.
  70   */
  71 private boolean usesShift;
  72
  73 /*************************************************************************/
  74
  75 /**
  76   * Initializes a new instance of <code>MenuShortcut</code> with the
  77   * specified virtual key value.
  78   *
  79   * @param key The virtual keycode for the shortcut.
  80   */
  81 public
  82 MenuShortcut(int key)
  83 {
  84   this(key, false);
  85 }
  86
  87 /*************************************************************************/
  88
  89 /**
  90   * Initializes a new instance of <code>MenuShortcut</code> with the
  91   * specified virtual key value and shift setting.
  92   *
  93   * @param key The virtual keycode for the shortcut.
  94   * @param usesShift <code>true</code> if the shift key was pressed,
  95   * <code>false</code> otherwise.
  96   */
  97 public
  98 MenuShortcut(int key, boolean usesShift)
  99 {
 100   this.key = key;
 101   this.usesShift = usesShift;
 102 }
 103
 104 /*************************************************************************/
 105
 106 /*
 107  * Instance Methods
 108  */
 109
 110 /**
 111   * Returns the virtual keycode for this shortcut.
 112   *
 113   * @return The virtual keycode for this shortcut.
 114   */
 115 public int
 116 getKey()
 117 {
 118   return(key);
 119 }
 120
 121 /*************************************************************************/
 122
 123 /**
 124   * Returns the shift setting for this shortcut.
 125   *
 126   * @return <code>true</code> if the shift key was pressed, <code>false</code>
 127   * otherwise.
 128   */
 129 public boolean
 130 usesShiftModifier()
 131 {
 132   return(usesShift);
 133 }
 134
 135 /*************************************************************************/
 136
 137 /**
 138   * Tests this object for equality against the specified object.  The two
 139   * objects will be considered equal if and only if the specified object
 140   * is an instance of <code>MenuShortcut</code> and has the same key value
 141   * and shift setting as this object.
 142   *
 143   * @param obj The object to test for equality against.
 144   *
 145   * @return <code>true</code> if the two objects are equal, <code>false</code>
 146   * otherwise.
 147   */
 148 public boolean
 149 equals(MenuShortcut obj)
 150 {
 151   if (obj == null)
 152     return(false);
 153
 154   if (obj.key != this.key)
 155     return(false);
 156
 157   if (obj.usesShift != this.usesShift)
 158     return(false);
 159
 160   return(true);
 161 }
 162
 163 public boolean
 164 equals(Object obj)
 165 {
 166   if (obj instanceof MenuShortcut)
 167     {
 168       MenuShortcut ms = (MenuShortcut) obj;
 169       return (ms.key == key && ms.usesShift == usesShift);
 170     }
 171   return false;
 172 }
 173
 174 /*************************************************************************/
 175
 176 /**
 177   * Returns a string representation of this shortcut.
 178   *
 179   * @return A string representation of this shortcut.
 180   */
 181 public String
 182 toString()
 183 {
 184   return(getClass().getName() + "[" + paramString () + "]");
 185 }
 186
 187 public int
 188 hashCode()
 189 {
 190   // Arbitrary.
 191   return key + (usesShift ? 23 : 57);
 192 }
 193
 194 /*************************************************************************/
 195
 196 /**
 197   * Returns a debugging string for this object.
 198   *
 199   * @return A debugging string for this object.
 200   */
 201 protected String
 202 paramString()
 203 {
 204   return "key=" + key + ",usesShift=" + usesShift;
 205 }
 206
 207 } // class MenuShortcut