Initial revision

From-SVN: r102074

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

@@ -0,0 +1,170 @@
+/* GtkClipboard.java
+   Copyright (C) 1999, 2005  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.awt.peer.gtk;
+
+import java.awt.datatransfer.Clipboard;
+import java.awt.datatransfer.ClipboardOwner;
+import java.awt.datatransfer.DataFlavor;
+import java.awt.datatransfer.StringSelection;
+import java.awt.datatransfer.Transferable;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+public class GtkClipboard extends Clipboard
+{
+  /* the number of milliseconds that we'll wait around for the
+     owner of the GDK_SELECTION_PRIMARY selection to convert 
+     the requested data */
+  static final int SELECTION_RECEIVED_TIMEOUT = 5000;
+
+  /* We currently only support transferring of text between applications */
+  static String selection;
+  static Object selectionLock = new Object ();
+
+  static boolean hasSelection = false;
+
+  protected GtkClipboard()
+  {
+    super("System Clipboard");
+    initNativeState();
+  }
+
+  public Transferable getContents(Object requestor)
+  {
+    synchronized (this)
+      {
+	if (hasSelection)
+	  return contents;
+      }
+
+    /* Java doesn't own the selection, so we need to ask X11 */
+    // XXX: Does this hold with Swing too ?
+    synchronized (selectionLock)
+      {
+	requestStringConversion();
+	
+	try 
+	  {
+	    selectionLock.wait(SELECTION_RECEIVED_TIMEOUT);
+	  } 
+	catch (InterruptedException e)
+	  {
+	    return null;
+	  }
+	
+	return selection == null ? null : new StringSelection(selection);
+      }
+  }
+
+  void stringSelectionReceived(String newSelection)
+  {
+    synchronized (selectionLock)
+      {
+	selection = newSelection;
+	selectionLock.notify();
+      }
+  }
+
+  /* convert Java clipboard data into a String suitable for sending
+     to another application */
+  synchronized String stringSelectionHandler() throws IOException
+  {
+    String selection = null;
+
+    try
+      {
+	if (contents.isDataFlavorSupported(DataFlavor.stringFlavor))
+	  selection = (String)contents.getTransferData(DataFlavor.stringFlavor);
+	else if (contents.isDataFlavorSupported(DataFlavor.plainTextFlavor))
+	  {
+	    StringBuffer sbuf = new StringBuffer();
+	    InputStreamReader reader;
+	    char readBuf[] = new char[512];
+	    int numChars;
+	  
+	    reader = new InputStreamReader 
+	      ((InputStream) 
+	       contents.getTransferData(DataFlavor.plainTextFlavor), "UNICODE");
+	  
+	    while (true)
+	      {
+		numChars = reader.read(readBuf);
+		if (numChars == -1)
+		  break;
+		sbuf.append(readBuf, 0, numChars);
+	      }
+	  
+	    selection = new String(sbuf);
+	  }
+      }
+    catch (Exception e)
+      {
+      }
+    
+    return selection;
+  }
+
+  public synchronized void setContents(Transferable contents,
+				       ClipboardOwner owner)
+  {
+    selectionGet();
+
+    this.contents = contents;
+    this.owner = owner;
+
+    hasSelection = true;
+  }
+
+  synchronized void selectionClear()
+  {
+    hasSelection = false;
+
+    if (owner != null)
+      {
+	owner.lostOwnership(this, contents);
+	owner = null;
+	contents = null;
+      }
+  }
+
+  native void initNativeState();
+  static native void requestStringConversion();
+  static native void selectionGet();
+}