libjava/javax/swing/DefaultListSelectionModel.java

   1 /* DefaultListSelectionModel.java --
   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., 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 javax.swing;
  40
  41 import java.io.Serializable;
  42 import java.util.EventListener;
  43 import java.util.Vector;
  44 import javax.swing.event.EventListenerList;
  45 import javax.swing.event.ListSelectionListener;
  46
  47 public class DefaultListSelectionModel implements Cloneable, ListSelectionModel, Serializable
  48 {
  49     int mode = SINGLE_SELECTION;
  50
  51     Vector sel = new Vector();
  52
  53     Vector listeners;
  54
  55     Vector get_listeners()
  56     {
  57         if (listeners == null)
  58             listeners = new Vector();
  59         return listeners;
  60     }
  61
  62
  63     public void addListSelectionListener(ListSelectionListener listener)
  64     {
  65         get_listeners().addElement(listener);
  66     }
  67
  68     public void removeListSelectionListener(ListSelectionListener listener)
  69     {
  70         get_listeners().removeElement(listener);
  71     }
  72
  73     class Range
  74     {
  75         int i0, i1;
  76
  77         Range(int a, int b)
  78         {
  79             if (a > b)
  80                 {
  81                     i0 = b;
  82                     i1 = a;
  83                 }
  84             else
  85                 {
  86                     i0 = a;
  87                     i1 = b;
  88                 }
  89         }
  90     }
  91
  92
  93     public int getMinSelectionIndex()
  94     {
  95         if (isSelectionEmpty())
  96             return -1;
  97
  98         boolean first = true;
  99         int min = -1;
 100         for (int i=0;i<sel.size();i++)
 101             {
 102                 Range r = (Range) sel.get(i);
 103
 104                 if (first)
 105                     {
 106                         min = r.i0;
 107                         first = false;
 108                     }
 109                 else
 110                     {
 111                         if (r.i0 > min)
 112                             {
 113                                 min = r.i0;
 114                             }
 115                     }
 116             }
 117         return min;
 118     }
 119
 120     public int getMaxSelectionIndex()
 121     {
 122         if (isSelectionEmpty())
 123             return -1;
 124
 125         boolean first = true;
 126         int max = -1;
 127         for (int i=1;i<sel.size();i++)
 128             {
 129                 Range r = (Range) sel.get(i);
 130
 131                 if (first)
 132                     {
 133                         max = r.i1;
 134                     }
 135                 else
 136                     {
 137                         if (r.i1 > max)
 138                             {
 139                                 max = r.i1;
 140                             }
 141                     }
 142             }
 143         return max;
 144     }
 145
 146     public boolean isSelectedIndex(int a)
 147     {
 148         for (int i=0;i<sel.size();i++)
 149             {
 150                 Range r = (Range) sel.get(i);
 151                 if (r.i0 <= a &&
 152                     r.i1 >= a)
 153                     {
 154                         return true;
 155                     }
 156             }
 157         return false;
 158     }
 159
 160
 161     public int getSelectionMode()
 162     { return mode; }
 163     public void setSelectionMode(int a)
 164     {   mode = a;    }
 165
 166     boolean isSelectionEmpty()
 167     {
 168         return sel.size() == 0;
 169     }
 170
 171     public void clearSelection()
 172     {
 173         sel.removeAllElements();
 174     }
 175
 176     public void setSelectionInterval(int index0, int index1)
 177     {
 178         if (mode == SINGLE_SELECTION)
 179             {
 180                 sel.removeAllElements();
 181             }
 182
 183         sel.addElement(new Range(index0, index1));
 184     }
 185 }