libjava/classpath/java/awt/dnd/DragSourceContext.java

   1 /* DragSourceContext.java --
   2    Copyright (C) 2002 Free Software Foundation
   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 java.awt.dnd;
  40
  41 import gnu.classpath.NotImplementedException;
  42
  43 import java.awt.Component;
  44 import java.awt.Cursor;
  45 import java.awt.Image;
  46 import java.awt.Point;
  47 import java.awt.datatransfer.Transferable;
  48 import java.awt.dnd.peer.DragSourceContextPeer;
  49 import java.io.Serializable;
  50 import java.util.TooManyListenersException;
  51
  52 /**
  53  * @since 1.2
  54  */
  55 public class DragSourceContext
  56   implements DragSourceListener, DragSourceMotionListener, Serializable
  57 {
  58   /**
  59    * Compatible with JDK 1.2+
  60    */
  61   static final long serialVersionUID = -115407898692194719L;
  62
  63   protected static final int DEFAULT = 0;
  64   protected static final int ENTER = 1;
  65   protected static final int OVER = 2;
  66   protected static final int CHANGED = 3;
  67
  68   private DragSourceContextPeer peer;
  69   private Cursor cursor;
  70   private Transferable transferable;
  71   private DragGestureEvent trigger;
  72   private DragSourceListener dragSourceListener;
  73   private boolean useCustomCursor; // FIXME: currently unused but needed for serialization.
  74   private int sourceActions; // FIXME: currently unused but needed for serialization.
  75   private Image image;
  76   private Point offset;
  77
  78   /**
  79    * Initializes a drag source context.
  80    *
  81    * @exception IllegalArgumentException If Component or DragSource of trigger
  82    * are null, the drag action for the trigger event is DnDConstants.ACTION_NONE
  83    * or if the source actions for the DragGestureRecognizer associated with the
  84    * trigger event are equal to DnDConstants.ACTION_NONE.
  85    * @exception NullPointerException If peer or trigger is null.
  86    */
  87   public DragSourceContext (DragSourceContextPeer peer,
  88                             DragGestureEvent trigger, Cursor cursor,
  89                             Image image, Point offset, Transferable trans,
  90                             DragSourceListener dsl)
  91     throws NotImplementedException
  92   {
  93     if (peer == null
  94         || trigger == null)
  95       throw new NullPointerException ();
  96
  97     if (trigger.getComponent () == null
  98         || trigger.getDragSource () == null
  99         || trigger.getDragAction () == DnDConstants.ACTION_NONE
 100         || trigger.getSourceAsDragGestureRecognizer ()
 101               .getSourceActions () == DnDConstants.ACTION_NONE)
 102       throw new IllegalArgumentException ();
 103
 104     this.peer = peer;
 105     this.trigger = trigger;
 106     this.cursor = cursor;
 107     this.image = image;
 108     this.offset = offset;
 109     this.transferable = trans;
 110     this.dragSourceListener = dsl;
 111
 112     throw new Error ("not implemented");
 113   }
 114
 115   public DragSource getDragSource()
 116   {
 117     return trigger.getDragSource ();
 118   }
 119
 120   public Component getComponent()
 121   {
 122     return trigger.getComponent ();
 123   }
 124
 125   public DragGestureEvent getTrigger()
 126   {
 127     return trigger;
 128   }
 129
 130   public int getSourceActions()
 131   {
 132     return trigger.getSourceAsDragGestureRecognizer ().getSourceActions ();
 133   }
 134
 135   public void setCursor (Cursor cursor)
 136     throws NotImplementedException
 137   {
 138     this.cursor = cursor;
 139     // FIXME: Check if we need to do more here
 140   }
 141
 142   public Cursor getCursor()
 143   {
 144     return cursor;
 145   }
 146
 147   /**
 148    * Adds a <code>DragSourceListener</code>.
 149    *
 150    * @exception TooManyListenersException If a <code>DragSourceListener</code>
 151    * has already been added.
 152    */
 153   public void addDragSourceListener (DragSourceListener dsl)
 154     throws TooManyListenersException
 155   {
 156     if (dragSourceListener != null)
 157       throw new TooManyListenersException ();
 158
 159     dragSourceListener = dsl;
 160   }
 161
 162   public void removeDragSourceListener (DragSourceListener dsl)
 163   {
 164     if (dragSourceListener == dsl)
 165       dragSourceListener = null;
 166   }
 167
 168   public void transferablesFlavorsChanged()
 169     throws NotImplementedException
 170   {
 171   }
 172
 173   public void dragEnter(DragSourceDragEvent e)
 174     throws NotImplementedException
 175   {
 176   }
 177
 178   public void dragOver(DragSourceDragEvent e)
 179     throws NotImplementedException
 180   {
 181   }
 182
 183   public void dragExit(DragSourceEvent e)
 184     throws NotImplementedException
 185   {
 186   }
 187
 188   public void dropActionChanged(DragSourceDragEvent e)
 189     throws NotImplementedException
 190   {
 191   }
 192
 193   public void dragDropEnd(DragSourceDropEvent e)
 194     throws NotImplementedException
 195   {
 196   }
 197
 198   public void dragMouseMoved(DragSourceDragEvent e)
 199     throws NotImplementedException
 200   {
 201   }
 202
 203   public Transferable getTransferable()
 204   {
 205     return transferable;
 206   }
 207
 208   protected void updateCurrentCursor(int dropOp, int targetAct, int status)
 209     throws NotImplementedException
 210   {
 211   }
 212 } // class DragSourceContext