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