libjava/gnu/java/awt/peer/gtk/GtkClipboard.java

   1 /* GtkClipboard.java
   2    Copyright (C) 1999, 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., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 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 gnu.java.awt.peer.gtk;
  40
  41 import java.awt.datatransfer.Clipboard;
  42 import java.awt.datatransfer.ClipboardOwner;
  43 import java.awt.datatransfer.DataFlavor;
  44 import java.awt.datatransfer.StringSelection;
  45 import java.awt.datatransfer.Transferable;
  46 import java.io.IOException;
  47 import java.io.InputStream;
  48 import java.io.InputStreamReader;
  49
  50 public class GtkClipboard extends Clipboard
  51 {
  52   /* the number of milliseconds that we'll wait around for the
  53      owner of the GDK_SELECTION_PRIMARY selection to convert
  54      the requested data */
  55   static final int SELECTION_RECEIVED_TIMEOUT = 5000;
  56
  57   /* We currently only support transferring of text between applications */
  58   static String selection;
  59   static Object selectionLock = new Object ();
  60
  61   static boolean hasSelection = false;
  62
  63   protected GtkClipboard()
  64   {
  65     super("System Clipboard");
  66     initNativeState();
  67   }
  68
  69   public Transferable getContents(Object requestor)
  70   {
  71     synchronized (this)
  72       {
  73         if (hasSelection)
  74           return contents;
  75       }
  76
  77     /* Java doesn't own the selection, so we need to ask X11 */
  78     // XXX: Does this hold with Swing too ?
  79     synchronized (selectionLock)
  80       {
  81         requestStringConversion();
  82
  83         try
  84           {
  85             selectionLock.wait(SELECTION_RECEIVED_TIMEOUT);
  86           }
  87         catch (InterruptedException e)
  88           {
  89             return null;
  90           }
  91
  92         return selection == null ? null : new StringSelection(selection);
  93       }
  94   }
  95
  96   void stringSelectionReceived(String newSelection)
  97   {
  98     synchronized (selectionLock)
  99       {
 100         selection = newSelection;
 101         selectionLock.notify();
 102       }
 103   }
 104
 105   /* convert Java clipboard data into a String suitable for sending
 106      to another application */
 107   synchronized String stringSelectionHandler() throws IOException
 108   {
 109     String selection = null;
 110
 111     try
 112       {
 113         if (contents.isDataFlavorSupported(DataFlavor.stringFlavor))
 114           selection = (String)contents.getTransferData(DataFlavor.stringFlavor);
 115         else if (contents.isDataFlavorSupported(DataFlavor.plainTextFlavor))
 116           {
 117             StringBuffer sbuf = new StringBuffer();
 118             InputStreamReader reader;
 119             char readBuf[] = new char[512];
 120             int numChars;
 121
 122             reader = new InputStreamReader
 123               ((InputStream)
 124                contents.getTransferData(DataFlavor.plainTextFlavor), "UNICODE");
 125
 126             while (true)
 127               {
 128                 numChars = reader.read(readBuf);
 129                 if (numChars == -1)
 130                   break;
 131                 sbuf.append(readBuf, 0, numChars);
 132               }
 133
 134             selection = new String(sbuf);
 135           }
 136       }
 137     catch (Exception e)
 138       {
 139       }
 140
 141     return selection;
 142   }
 143
 144   public synchronized void setContents(Transferable contents,
 145                                        ClipboardOwner owner)
 146   {
 147     selectionGet();
 148
 149     this.contents = contents;
 150     this.owner = owner;
 151
 152     hasSelection = true;
 153   }
 154
 155   synchronized void selectionClear()
 156   {
 157     hasSelection = false;
 158
 159     if (owner != null)
 160       {
 161         owner.lostOwnership(this, contents);
 162         owner = null;
 163         contents = null;
 164       }
 165   }
 166
 167   native void initNativeState();
 168   static native void requestStringConversion();
 169   static native void selectionGet();
 170 }