libjava/gnu/java/awt/peer/gtk/GtkChoicePeer.java

   1 /* GtkChoicePeer.java -- Implements ChoicePeer with GTK
   2    Copyright (C) 1998, 1999, 2005  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 gnu.java.awt.peer.gtk;
  40
  41 import java.awt.Choice;
  42 import java.awt.event.ItemEvent;
  43 import java.awt.peer.ChoicePeer;
  44
  45 public class GtkChoicePeer extends GtkComponentPeer
  46   implements ChoicePeer
  47 {
  48   public GtkChoicePeer (Choice c)
  49   {
  50     super (c);
  51
  52     int count = c.getItemCount ();
  53     if (count > 0)
  54       {
  55         String items[] = new String[count];
  56         for (int i = 0; i < count; i++)
  57           items[i] = c.getItem (i);
  58
  59         append (items);
  60       }
  61
  62     int selected = c.getSelectedIndex();
  63     if (selected >= 0)
  64       select(selected);
  65   }
  66
  67   native void create ();
  68
  69   native void append (String items[]);
  70   native int nativeGetSelected ();
  71   native void nativeAdd (String item, int index);
  72   native void nativeRemove (int index);
  73   native void nativeRemoveAll ();
  74
  75   public native void select (int position);
  76
  77   public void add (String item, int index)
  78   {
  79     int before = nativeGetSelected();
  80
  81     nativeAdd (item, index);
  82
  83     /* Generate an ItemEvent if we added the first one or
  84        if we inserted at or before the currently selected item. */
  85     if ((before < 0) || (before >= index))
  86       {
  87         // Must set our state before notifying listeners
  88         ((Choice) awtComponent).select (((Choice) awtComponent).getItem (0));
  89         postItemEvent (((Choice) awtComponent).getItem (0), ItemEvent.SELECTED);
  90       }
  91   }
  92
  93   public void remove (int index)
  94   {
  95     int before = nativeGetSelected();
  96     int after;
  97
  98     nativeRemove (index);
  99     after = nativeGetSelected();
 100
 101     /* Generate an ItemEvent if we are removing the currently selected item
 102        and there are at least one item left. */
 103     if ((before == index) && (after >= 0))
 104       {
 105         // Must set our state before notifying listeners
 106         ((Choice) awtComponent).select (((Choice) awtComponent).getItem (0));
 107         postItemEvent (((Choice) awtComponent).getItem (0), ItemEvent.SELECTED);
 108       }
 109   }
 110
 111   public void removeAll ()
 112   {
 113     nativeRemoveAll();
 114   }
 115
 116   public void addItem (String item, int position)
 117   {
 118     add (item, position);
 119   }
 120
 121   protected void choicePostItemEvent (String label, int stateChange)
 122   {
 123     // Must set our state before notifying listeners
 124     if (stateChange == ItemEvent.SELECTED)
 125       ((Choice) awtComponent).select (label);
 126     postItemEvent (label, stateChange);
 127   }
 128 }