Source for gnu.java.awt.EventModifier

   1: /* EventModifier.java -- tool for converting modifier bits to 1.4 syle
   2:    Copyright (C) 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., 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 gnu.java.awt;
  40: 
  41: import java.awt.event.InputEvent;
  42: 
  43: public class EventModifier
  44: {
  45:   /** The mask for old events. */
  46:   public static final int OLD_MASK = 0x3f;
  47: 
  48:   /** The mask for new events. */
  49:   public static final int NEW_MASK = 0x3fc0;
  50: 
  51:   /**
  52:    * Non-instantiable.
  53:    */
  54:   private EventModifier()
  55:   {
  56:     throw new InternalError();
  57:   }
  58: 
  59:   /**
  60:    * Converts the old style modifiers (0x3f) to the new style (0xffffffc0).
  61:    *
  62:    * @param mod the modifiers to convert
  63:    * @return the adjusted modifiers
  64:    */
  65:   public static int extend(int mod)
  66:   {
  67:     // Favor what we hope will be the common case.
  68:     if ((mod & OLD_MASK) == 0)
  69:       return mod;
  70:     if ((mod & InputEvent.SHIFT_MASK) != 0)
  71:       mod |= InputEvent.SHIFT_DOWN_MASK;
  72:     if ((mod & InputEvent.CTRL_MASK) != 0)
  73:       mod |= InputEvent.CTRL_DOWN_MASK;
  74:     if ((mod & InputEvent.META_MASK) != 0)
  75:       mod |= InputEvent.META_DOWN_MASK;
  76:     if ((mod & InputEvent.ALT_MASK) != 0)
  77:       mod |= InputEvent.ALT_DOWN_MASK;
  78:     if ((mod & InputEvent.BUTTON1_MASK) != 0)
  79:       mod |= InputEvent.BUTTON1_DOWN_MASK;
  80:     if ((mod & InputEvent.ALT_GRAPH_MASK) != 0)
  81:       mod |= InputEvent.ALT_GRAPH_DOWN_MASK;
  82:     return mod & ~OLD_MASK;
  83:   }
  84: 
  85:   /**
  86:    * Converts the new style modifiers (0xffffffc0) to the old style (0x3f).
  87:    *
  88:    * @param mod the modifiers to convert
  89:    * @return the adjusted modifiers
  90:    */
  91:   public static int revert(int mod)
  92:   {
  93:     if ((mod & InputEvent.SHIFT_DOWN_MASK) != 0)
  94:       mod |= InputEvent.SHIFT_MASK;
  95:     if ((mod & InputEvent.CTRL_DOWN_MASK) != 0)
  96:       mod |= InputEvent.CTRL_MASK;
  97:     if ((mod & InputEvent.META_DOWN_MASK) != 0)
  98:       mod |= InputEvent.META_MASK;
  99:     if ((mod & InputEvent.ALT_DOWN_MASK) != 0)
 100:       mod |= InputEvent.ALT_MASK;
 101:     if ((mod & InputEvent.ALT_GRAPH_DOWN_MASK) != 0)
 102:       mod |= InputEvent.ALT_GRAPH_MASK;
 103:     if ((mod & InputEvent.BUTTON1_DOWN_MASK) != 0)
 104:       mod |= InputEvent.BUTTON1_MASK;
 105:     return mod & OLD_MASK;
 106:   }
 107: } // class EventModifier