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 package javax.swing;
  39
  40 import javax.swing.event.*;
  41 import java.util.*;
  42
  43 public class DefaultListSelectionModel implements ListSelectionModel
  44 {
  45     int mode = SINGLE_SELECTION;
  46
  47     Vector sel = new Vector();
  48
  49     Vector listeners;
  50
  51     Vector get_listeners()
  52     {
  53         if (listeners == null)
  54             listeners = new Vector();
  55         return listeners;
  56     }
  57
  58
  59     public void addListSelectionListener(ListSelectionListener listener)
  60     {
  61         get_listeners().addElement(listener);
  62     }
  63
  64     public void removeListSelectionListener(ListSelectionListener listener)
  65     {
  66         get_listeners().removeElement(listener);
  67     }
  68
  69     class Range
  70     {
  71         int i0, i1;
  72
  73         Range(int a, int b)
  74         {
  75             if (a > b)
  76                 {
  77                     i0 = b;
  78                     i1 = a;
  79                 }
  80             else
  81                 {
  82                     i0 = a;
  83                     i1 = b;
  84                 }
  85         }
  86     }
  87
  88
  89     public int getMinSelectionIndex()
  90     {
  91         if (isSelectionEmpty())
  92             return -1;
  93
  94         boolean first = true;
  95         int min = -1;
  96         for (int i=0;i<sel.size();i++)
  97             {
  98                 Range r = (Range) sel.get(i);
  99
 100                 if (first)
 101                     {
 102                         min = r.i0;
 103                         first = false;
 104                     }
 105                 else
 106                     {
 107                         if (r.i0 > min)
 108                             {
 109                                 min = r.i0;
 110                             }
 111                     }
 112             }
 113         return min;
 114     }
 115
 116     public int getMaxSelectionIndex()
 117     {
 118         if (isSelectionEmpty())
 119             return -1;
 120
 121         boolean first = true;
 122         int max = -1;
 123         for (int i=1;i<sel.size();i++)
 124             {
 125                 Range r = (Range) sel.get(i);
 126
 127                 if (first)
 128                     {
 129                         max = r.i1;
 130                     }
 131                 else
 132                     {
 133                         if (r.i1 > max)
 134                             {
 135                                 max = r.i1;
 136                             }
 137                     }
 138             }
 139         return max;
 140     }
 141
 142     public boolean isSelectedIndex(int a)
 143     {
 144         for (int i=0;i<sel.size();i++)
 145             {
 146                 Range r = (Range) sel.get(i);
 147                 if (r.i0 <= a &&
 148                     r.i1 >= a)
 149                     {
 150                         return true;
 151                     }
 152             }
 153         return false;
 154     }
 155
 156
 157     public int getSelectionMode()
 158     { return mode; }
 159     public void setSelectionMode(int a)
 160     {   mode = a;    }
 161
 162     boolean isSelectionEmpty()
 163     {
 164         return sel.size() == 0;
 165     }
 166
 167     public void clearSelection()
 168     {
 169         sel.removeAllElements();
 170     }
 171
 172     public void setSelectionInterval(int index0, int index1)
 173     {
 174         if (mode == SINGLE_SELECTION)
 175             {
 176                 sel.removeAllElements();
 177             }
 178
 179         sel.addElement(new Range(index0, index1));
 180     }
 181 }