gomp-20050608-branch/libjava/classpath/javax/swing/TransferHandler.java

   1 /* TransferHandler.java --
   2    Copyright (C) 2004, 2005 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 javax.swing;
  40
  41 import java.awt.datatransfer.Clipboard;
  42 import java.awt.datatransfer.DataFlavor;
  43 import java.awt.datatransfer.Transferable;
  44 import java.awt.event.ActionEvent;
  45 import java.awt.event.InputEvent;
  46 import java.awt.Toolkit;
  47 import java.io.Serializable;
  48
  49 public class TransferHandler implements Serializable
  50 {
  51   static class TransferAction extends AbstractAction
  52   {
  53     private String command;
  54
  55     public TransferAction(String command)
  56     {
  57       super(command);
  58       this.command = command;
  59     }
  60
  61     public void actionPerformed(ActionEvent event)
  62     {
  63       JComponent component = (JComponent) event.getSource();
  64       TransferHandler transferHandler = component.getTransferHandler();
  65       Clipboard clipboard = getClipboard(component);
  66
  67       if (clipboard == null)
  68         {
  69           // Access denied!
  70           Toolkit.getDefaultToolkit().beep();
  71           return;
  72         }
  73
  74       if (command.equals(COMMAND_COPY))
  75         transferHandler.exportToClipboard(component, clipboard, COPY);
  76       else if (command.equals(COMMAND_CUT))
  77         transferHandler.exportToClipboard(component, clipboard, MOVE);
  78       else if (command.equals(COMMAND_PASTE))
  79         {
  80           Transferable transferable = clipboard.getContents(null);
  81
  82           if (transferable != null)
  83             transferHandler.importData(component, transferable);
  84         }
  85     }
  86
  87     /**
  88      * Get the system cliboard or null if the caller isn't allowed to
  89      * access the system clipboard.
  90      *
  91      * @param component a component, used to get the toolkit.
  92      * @return the clipboard
  93      */
  94     private static Clipboard getClipboard(JComponent component)
  95     {
  96       try
  97         {
  98           return component.getToolkit().getSystemClipboard();
  99         }
 100       catch (SecurityException se)
 101         {
 102           return null;
 103         }
 104     }
 105   }
 106
 107   private static final long serialVersionUID = -967749805571669910L;
 108
 109   private static final String COMMAND_COPY = "copy";
 110   private static final String COMMAND_CUT = "cut";
 111   private static final String COMMAND_PASTE = "paste";
 112
 113   public static final int NONE = 0;
 114   public static final int COPY = 1;
 115   public static final int MOVE = 2;
 116   public static final int COPY_OR_MOVE = 3;
 117
 118   private static Action copyAction = new TransferAction(COMMAND_COPY);
 119   private static Action cutAction = new TransferAction(COMMAND_CUT);
 120   private static Action pasteAction = new TransferAction(COMMAND_PASTE);
 121
 122   private int sourceActions;
 123   private Icon visualRepresentation;
 124
 125   public static Action getCopyAction()
 126   {
 127     return copyAction;
 128   }
 129
 130   public static Action getCutAction()
 131   {
 132     return cutAction;
 133   }
 134
 135   public static Action getPasteAction()
 136   {
 137     return pasteAction;
 138   }
 139
 140   protected TransferHandler()
 141   {
 142     this.sourceActions = NONE;
 143   }
 144
 145   public TransferHandler(String property)
 146   {
 147     this.sourceActions = property != null ? COPY : NONE;
 148   }
 149
 150   public boolean canImport (JComponent c, DataFlavor[] flavors)
 151   {
 152     return false;
 153   }
 154
 155   protected Transferable createTransferable(JComponent c)
 156   {
 157     return null;
 158   }
 159
 160   public void exportAsDrag (JComponent c, InputEvent e, int action)
 161   {
 162     // TODO: Implement this properly
 163   }
 164
 165   protected void exportDone (JComponent c, Transferable data, int action)
 166   {
 167     // TODO: Implement this properly
 168   }
 169
 170   public void exportToClipboard(JComponent c, Clipboard clip, int action)
 171   {
 172     // TODO: Implement this properly
 173   }
 174
 175   public int getSourceActions (JComponent c)
 176   {
 177     return sourceActions;
 178   }
 179
 180   public Icon getVisualRepresentation (Transferable t)
 181   {
 182     return visualRepresentation;
 183   }
 184
 185   public boolean importData (JComponent c, Transferable t)
 186   {
 187     return false;
 188   }
 189 }