001 /* DropTargetContext.java --
002 Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038 package java.awt.dnd;
039
040 import java.awt.Component;
041 import java.awt.datatransfer.DataFlavor;
042 import java.awt.datatransfer.Transferable;
043 import java.awt.datatransfer.UnsupportedFlavorException;
044 import java.awt.dnd.peer.DropTargetContextPeer;
045 import java.io.IOException;
046 import java.io.Serializable;
047 import java.util.Arrays;
048 import java.util.List;
049
050 /**
051 * @author Michael Koch (konqueror@gmx.de)
052 * @author Andrew John Hughes (gnu_andrew@member.fsf.org)
053 * @since 1.2
054 */
055 public class DropTargetContext implements Serializable
056 {
057 static final long serialVersionUID = -634158968993743371L;
058
059 protected class TransferableProxy implements Transferable
060 {
061 protected boolean isLocal;
062 protected Transferable transferable;
063
064 TransferableProxy(Transferable t, boolean local)
065 {
066 this.transferable = t;
067 this.isLocal = local;
068 }
069
070 public DataFlavor[] getTransferDataFlavors()
071 {
072 return transferable.getTransferDataFlavors();
073 }
074
075 public boolean isDataFlavorSupported(DataFlavor flavor)
076 {
077 return transferable.isDataFlavorSupported(flavor);
078 }
079
080 public Object getTransferData(DataFlavor flavor)
081 throws UnsupportedFlavorException, IOException
082 {
083 return transferable.getTransferData (flavor);
084 }
085 }
086
087 private DropTarget dropTarget;
088 private int targetActions;
089 private DropTargetContextPeer dtcp;
090
091 // package private
092 DropTargetContext(DropTarget dropTarget)
093 {
094 this.dropTarget = dropTarget;
095 }
096
097 public DropTarget getDropTarget()
098 {
099 return dropTarget;
100 }
101
102 public Component getComponent()
103 {
104 return dropTarget.getComponent();
105 }
106
107 public void addNotify(DropTargetContextPeer dtcp)
108 {
109 this.dtcp = dtcp;
110 }
111
112 public void removeNotify()
113 {
114 this.dtcp = null;
115 }
116
117 protected void setTargetActions(int actions)
118 {
119 targetActions = actions;
120 }
121
122 protected int getTargetActions()
123 {
124 return targetActions;
125 }
126
127 /**
128 * Signals that the drop is completed.
129 *
130 * @exception InvalidDnDOperationException If a drop is not outstanding.
131 */
132 public void dropComplete (boolean success)
133 {
134 if (dtcp != null)
135 dtcp.dropComplete(success);
136 }
137
138 protected void acceptDrag (int dragOperation)
139 {
140 if (dtcp != null)
141 dtcp.acceptDrag(dragOperation);
142 }
143
144 protected void rejectDrag ()
145 {
146 if (dtcp != null)
147 dtcp.rejectDrag();
148 }
149
150 protected void acceptDrop (int dropOperation)
151 {
152 if (dtcp != null)
153 dtcp.acceptDrop(dropOperation);
154 }
155
156 protected void rejectDrop ()
157 {
158 if (dtcp != null)
159 dtcp.rejectDrop();
160 }
161
162 protected DataFlavor[] getCurrentDataFlavors ()
163 {
164 if (dtcp != null)
165 dtcp.getTransferDataFlavors();
166 return null;
167 }
168
169 protected List<DataFlavor> getCurrentDataFlavorsAsList ()
170 {
171 return Arrays.asList(getCurrentDataFlavors ());
172 }
173
174 protected boolean isDataFlavorSupported (DataFlavor flavor)
175 {
176 return getCurrentDataFlavorsAsList().contains (flavor);
177 }
178
179 /**
180 * Return the <code>Transferable</code> operandof this operation.
181 *
182 * @exception InvalidDnDOperationException If a drag is not outstanding.
183 */
184 protected Transferable getTransferable()
185 throws InvalidDnDOperationException
186 {
187 // FIXME: Implement this
188 if (dtcp != null)
189 return dtcp.getTransferable();
190 return null;
191 }
192
193 protected Transferable createTransferableProxy(Transferable t, boolean local)
194 {
195 return new TransferableProxy(t, local);
196 }
197 } // class DropTargetContext