Source for java.awt.dnd.DragGestureRecognizer

   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