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 gnu.classpath.NotImplementedException;
  42
  43 import java.awt.Component;
  44 import java.awt.Point;
  45 import java.awt.event.InputEvent;
  46 import java.io.IOException;
  47 import java.io.ObjectInputStream;
  48 import java.io.ObjectOutputStream;
  49 import java.io.Serializable;
  50 import java.util.ArrayList;
  51 import java.util.TooManyListenersException;
  52
  53 /**
  54  * STUBBED
  55  * @since 1.2
  56  */
  57 public abstract class DragGestureRecognizer implements Serializable
  58 {
  59   /**
  60    * Compatible with JDK 1.2+.
  61    */
  62   private static final long serialVersionUID = 8996673345831063337L;
  63
  64   protected DragSource dragSource;
  65   protected Component component;
  66   protected transient DragGestureListener dragGestureListener;
  67   protected int sourceActions;
  68   protected ArrayList events = new ArrayList();
  69
  70   protected DragGestureRecognizer(DragSource ds, Component c, int sa,
  71                                   DragGestureListener dgl)
  72   {
  73     if (ds == null)
  74       throw new IllegalArgumentException();
  75     dragSource = ds;
  76     component = c;
  77     sourceActions = sa;
  78     dragGestureListener = dgl;
  79   }
  80
  81   protected DragGestureRecognizer(DragSource ds, Component c, int sa)
  82   {
  83     this(ds, c, sa, null);
  84   }
  85
  86   protected DragGestureRecognizer(DragSource ds, Component c)
  87   {
  88     this(ds, c, 0, null);
  89   }
  90
  91   protected DragGestureRecognizer(DragSource ds)
  92   {
  93     this(ds, null, 0, null);
  94   }
  95
  96   protected abstract void registerListeners();
  97
  98   protected abstract void unregisterListeners();
  99
 100   public DragSource getDragSource()
 101   {
 102     return dragSource;
 103   }
 104
 105   public Component getComponent()
 106   {
 107     return component;
 108   }
 109
 110   public void setComponent(Component c)
 111   {
 112     component = c;
 113   }
 114
 115   public int getSourceActions()
 116   {
 117     return sourceActions;
 118   }
 119
 120   public void setSourceActions(int sa)
 121   {
 122     sourceActions = sa;
 123   }
 124
 125   public InputEvent getTriggerEvent()
 126   {
 127     return events.size() > 0 ? (InputEvent) events.get(0) : null;
 128   }
 129
 130   public void resetRecognizer()
 131     throws NotImplementedException
 132   {
 133     throw new Error("not implemented");
 134   }
 135
 136   /**
 137    * Register a new DragGestureListener.
 138    *
 139    * @exception TooManyListenersException If a DragGestureListener has already
 140    * been added.
 141    */
 142   public void addDragGestureListener(DragGestureListener dgl)
 143     throws TooManyListenersException
 144   {
 145     if (dragGestureListener != null)
 146       throw new TooManyListenersException();
 147     dragGestureListener = dgl;
 148   }
 149
 150   public void removeDragGestureListener(DragGestureListener dgl)
 151   {
 152     if (dragGestureListener != dgl)
 153       throw new IllegalArgumentException();
 154     dragGestureListener = null;
 155   }
 156
 157   protected void fireDragGestureRecognized(int dragAction, Point p)
 158     throws NotImplementedException
 159   {
 160     throw new Error("not implemented");
 161   }
 162
 163   protected void appendEvent(InputEvent e)
 164   {
 165     if (e == null)
 166       return;
 167     events.add(e);
 168   }
 169
 170   private void readObject(ObjectInputStream s)
 171     throws ClassNotFoundException, IOException
 172   {
 173     s.defaultReadObject();
 174     dragGestureListener = (DragGestureListener) s.readObject();
 175   }
 176
 177   private void writeObject(ObjectOutputStream s) throws IOException
 178   {
 179     s.defaultWriteObject();
 180     s.writeObject(dragGestureListener instanceof Serializable
 181                   ? dragGestureListener : null);
 182   }
 183 } // class DragGestureRecognizer