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

   1 /* GtkClipboard.java
   2    Copyright (C) 1999 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 package gnu.java.awt.peer.gtk;
  39
  40 import java.awt.*;
  41 import java.io.*;
  42 import java.net.*;
  43 import java.util.*;
  44 import java.awt.datatransfer.*;
  45 import java.awt.image.*;
  46 import java.awt.peer.*;
  47
  48 public class GtkClipboard extends Clipboard
  49 {
  50   /* the number of milliseconds that we'll wait around for the
  51      owner of the GDK_SELECTION_PRIMARY selection to convert
  52      the requested data */
  53   final static int SELECTION_RECEIVED_TIMEOUT = 5000;
  54
  55   /* We currently only support transferring of text between applications */
  56   static String selection;
  57   static Object selectionLock = new Object ();
  58
  59   static boolean hasSelection = false;
  60
  61   protected
  62   GtkClipboard ()
  63   {
  64     super ("System Clipboard");
  65     initNativeState ();
  66   }
  67
  68   public Transferable
  69   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     synchronized (selectionLock)
  79       {
  80         requestStringConversion ();
  81         try
  82           {
  83             selectionLock.wait (SELECTION_RECEIVED_TIMEOUT);
  84           }
  85         catch (InterruptedException e)
  86           {
  87             return null;
  88           }
  89
  90         return (selection == null) ? null : new StringSelection (selection);
  91       }
  92   }
  93
  94   void
  95   stringSelectionReceived (String newSelection)
  96   {
  97     synchronized (selectionLock)
  98       {
  99         selection = newSelection;
 100         selectionLock.notify ();
 101       }
 102   }
 103
 104   /* convert Java clipboard data into a String suitable for sending
 105      to another application */
 106   synchronized String
 107   stringSelectionHandler () throws IOException
 108   {
 109     String selection = null;
 110
 111     try {
 112       if (contents.isDataFlavorSupported (DataFlavor.stringFlavor))
 113         selection = (String)contents.getTransferData (DataFlavor.stringFlavor);
 114       else if (contents.isDataFlavorSupported (DataFlavor.plainTextFlavor))
 115         {
 116           StringBuffer sbuf = new StringBuffer ();
 117           InputStreamReader reader;
 118           char readBuf[] = new char[512];
 119           int numChars;
 120
 121           reader = new InputStreamReader
 122             ((InputStream)
 123              contents.getTransferData (DataFlavor.plainTextFlavor), "UNICODE");
 124
 125           while (true)
 126             {
 127               numChars = reader.read (readBuf);
 128               if (numChars == -1)
 129                 break;
 130               sbuf.append (readBuf, 0, numChars);
 131             }
 132
 133           selection = new String (sbuf);
 134         }
 135     } catch (Exception e) { }
 136
 137     return selection;
 138   }
 139
 140   public synchronized void
 141   setContents (Transferable contents, ClipboardOwner owner)
 142   {
 143     selectionGet ();
 144
 145     this.contents = contents;
 146     this.owner = owner;
 147
 148     hasSelection = true;
 149   }
 150
 151   synchronized
 152   void selectionClear ()
 153   {
 154     hasSelection = false;
 155
 156     if (owner != null)
 157       {
 158         owner.lostOwnership (this, contents);
 159         owner = null;
 160         contents = null;
 161       }
 162   }
 163
 164   native void initNativeState ();
 165   native static void requestStringConversion ();
 166   native static void selectionGet ();
 167 }