gomp-20050608-branch/libjava/classpath/java/awt/dnd/DragGestureRecognizer.java

   1 /* DragGestureRecognizer.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., 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 java.awt.Component;
  42 import java.awt.Point;
  43 import java.awt.event.InputEvent;
  44 import java.io.IOException;
  45 import java.io.ObjectInputStream;
  46 import java.io.ObjectOutputStream;
  47 import java.io.Serializable;
  48 import java.util.ArrayList;
  49 import java.util.TooManyListenersException;
  50
  51 /**
  52  * STUBBED
  53  * @since 1.2
  54  */
  55 public abstract class DragGestureRecognizer implements Serializable
  56 {
  57   /**
  58    * Compatible with JDK 1.2+.
  59    */
  60   private static final long serialVersionUID = 8996673345831063337L;
  61
  62   protected DragSource dragSource;
  63   protected Component component;
  64   protected transient DragGestureListener dragGestureListener;
  65   protected int sourceActions;
  66   protected ArrayList events = new ArrayList();
  67
  68   protected DragGestureRecognizer(DragSource ds, Component c, int sa,
  69                                   DragGestureListener dgl)
  70   {
  71     if (ds == null)
  72       throw new IllegalArgumentException();
  73     dragSource = ds;
  74     component = c;
  75     sourceActions = sa;
  76     dragGestureListener = dgl;
  77   }
  78
  79   protected DragGestureRecognizer(DragSource ds, Component c, int sa)
  80   {
  81     this(ds, c, sa, null);
  82   }
  83
  84   protected DragGestureRecognizer(DragSource ds, Component c)
  85   {
  86     this(ds, c, 0, null);
  87   }
  88
  89   protected DragGestureRecognizer(DragSource ds)
  90   {
  91     this(ds, null, 0, null);
  92   }
  93
  94   protected abstract void registerListeners();
  95
  96   protected abstract void unregisterListeners();
  97
  98   public DragSource getDragSource()
  99   {
 100     return dragSource;
 101   }
 102
 103   public Component getComponent()
 104   {
 105     return component;
 106   }
 107
 108   public void setComponent(Component c)
 109   {
 110     component = c;
 111   }
 112
 113   public int getSourceActions()
 114   {
 115     return sourceActions;
 116   }
 117
 118   public void setSourceActions(int sa)
 119   {
 120     sourceActions = sa;
 121   }
 122
 123   public InputEvent getTriggerEvent()
 124   {
 125     return events.size() > 0 ? (InputEvent) events.get(0) : null;
 126   }
 127
 128   public void resetRecognizer()
 129   {
 130     throw new Error("not implemented");
 131   }
 132
 133   /**
 134    * Register a new DragGestureListener.
 135    *
 136    * @exception TooManyListenersException If a DragGestureListener has already
 137    * been added.
 138    */
 139   public void addDragGestureListener(DragGestureListener dgl)
 140     throws TooManyListenersException
 141   {
 142     if (dragGestureListener != null)
 143       throw new TooManyListenersException();
 144     dragGestureListener = dgl;
 145   }
 146
 147   public void removeDragGestureListener(DragGestureListener dgl)
 148   {
 149     if (dragGestureListener != dgl)
 150       throw new IllegalArgumentException();
 151     dragGestureListener = null;
 152   }
 153
 154   protected void fireDragGestureRecognized(int dragAction, Point p)
 155   {
 156     throw new Error("not implemented");
 157   }
 158
 159   protected void appendEvent(InputEvent e)
 160   {
 161     if (e == null)
 162       return;
 163     events.add(e);
 164   }
 165
 166   private void readObject(ObjectInputStream s)
 167     throws ClassNotFoundException, IOException
 168   {
 169     s.defaultReadObject();
 170     dragGestureListener = (DragGestureListener) s.readObject();
 171   }
 172
 173   private void writeObject(ObjectOutputStream s) throws IOException
 174   {
 175     s.defaultWriteObject();
 176     s.writeObject(dragGestureListener instanceof Serializable
 177                   ? dragGestureListener : null);
 178   }
 179 } // class DragGestureRecognizer