Source for java.awt.dnd.DropTargetDragEvent

   1: /* DropTargetDragEvent.java --
   2:    Copyright (C) 2002, 2004  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.Point;
  42: import java.awt.datatransfer.DataFlavor;
  43: import java.awt.datatransfer.Transferable;
  44: import java.util.List;
  45: 
  46: /**
  47:  * @since 1.2
  48:  */
  49: public class DropTargetDragEvent extends DropTargetEvent
  50: {
  51:   /**
  52:    * Compatible with 1.2+
  53:    */
  54:   private static final long serialVersionUID = -8422265619058953682L;
  55: 
  56:   private final int dropAction;
  57:   private final int srcActions;
  58:   private final Point location;
  59: 
  60:   /**
  61:    * Initializes a <code>DropTargetDragEvent</code>.
  62:    *
  63:    * @exception IllegalArgumentException If dropAction is not one of DnDConstants,
  64:    * srcActions is not a bitwise mask of DnDConstants, or dtc is null.
  65:    * @exception NullPointerException If location is null.
  66:    */
  67:   public DropTargetDragEvent (DropTargetContext context, Point location,
  68:                               int dropAction, int srcActions)
  69:   {
  70:     super (context);
  71: 
  72:     if (location == null)
  73:       throw new NullPointerException ();
  74: 
  75:     if (context == null)
  76:       throw new IllegalArgumentException ();
  77: 
  78:     if (dropAction != DnDConstants.ACTION_NONE
  79:         && dropAction != DnDConstants.ACTION_COPY
  80:         && dropAction != DnDConstants.ACTION_MOVE
  81:         && dropAction != DnDConstants.ACTION_COPY_OR_MOVE
  82:         && dropAction != DnDConstants.ACTION_LINK
  83:         && dropAction != DnDConstants.ACTION_REFERENCE)
  84:       throw new IllegalArgumentException ();
  85: 
  86:     int srcActionsMask = DnDConstants.ACTION_NONE
  87:                          | DnDConstants.ACTION_COPY
  88:                          | DnDConstants.ACTION_MOVE
  89:                          | DnDConstants.ACTION_COPY_OR_MOVE
  90:                          | DnDConstants.ACTION_LINK
  91:                          | DnDConstants.ACTION_REFERENCE;
  92:     
  93:     if (~(srcActions ^ srcActionsMask) != 0)
  94:       throw new IllegalArgumentException ();
  95:     
  96:     this.dropAction = dropAction;
  97:     this.srcActions = srcActions;
  98:     this.location = location;
  99:   }
 100: 
 101:   public void acceptDrag (int dragOperation)
 102:   {
 103:     context.acceptDrag (dragOperation);
 104:   }
 105: 
 106:   public DataFlavor[] getCurrentDataFlavors ()
 107:   {
 108:     return context.getCurrentDataFlavors ();
 109:   }
 110:   
 111:   public List<DataFlavor> getCurrentDataFlavorsAsList ()
 112:   {
 113:     return context.getCurrentDataFlavorsAsList ();
 114:   }
 115:   
 116:   public int getDropAction()
 117:   {
 118:     return dropAction & ((DropTargetContext) source).getTargetActions();
 119:   }
 120: 
 121:   public Point getLocation ()
 122:   {
 123:     return location;
 124:   }
 125: 
 126:   public int getSourceActions ()
 127:   {
 128:     return srcActions;
 129:   }
 130: 
 131:   public boolean isDataFlavorSupported (DataFlavor df)
 132:   {
 133:     return context.isDataFlavorSupported (df);
 134:   }
 135: 
 136:   public void rejectDrag ()
 137:   {
 138:     context.rejectDrag ();
 139:   }
 140:   
 141:   /**
 142:    * TODO
 143:    * 
 144:    * @return
 145:    * 
 146:    * @since 1.5
 147:    */
 148:   public Transferable getTransferable()
 149:   {
 150:     return context.getTransferable();
 151:   }
 152: } // class DropTargetDragEvent