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/*
* SIP Communicator, the OpenSource Java VoIP and Instant Messaging client.
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package net.java.sip.communicator.util.swing;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import net.java.sip.communicator.util.*;
/**
* The <tt>FileDragLabel</tt> extends <tt>JLabel</tt> and associates to it a
* file. The label is made draggable and it is possible to drag it directly to
* the file browser of the operating system.
*
* @author Yana Stamcheva
*/
public class FileDragLabel
extends JLabel
implements DropTargetListener,
DragSourceListener,
DragGestureListener
{
private static final Logger logger = Logger.getLogger(FileDragLabel.class);
private final DragSource dragSource = DragSource.getDefaultDragSource();
private File file;
/**
* Creates a <tt>FileDragLabel</tt>.
*/
public FileDragLabel()
{
dragSource.createDefaultDragGestureRecognizer(
this, DnDConstants.ACTION_COPY, this);
}
/**
* Sets the file associated with this file drag label.
*
* @param file the file associated with this file drag label
*/
public void setFile(File file)
{
this.file = file;
}
/**
* Called while a drag operation is ongoing, when the mouse pointer enters
* the operable part of the drop site for the <code>DropTarget</code>
* registered with this listener.
*
* @param dropTargetDragEvent the <code>DropTargetDragEvent</code>
*/
public void dragEnter(DropTargetDragEvent dropTargetDragEvent)
{
dropTargetDragEvent.acceptDrag(DnDConstants.ACTION_COPY_OR_MOVE);
}
/**Called when the drag operation has terminated with a drop on
* the operable part of the drop site for the <code>DropTarget</code>
* registered with this listener.
*/
public synchronized void drop(DropTargetDropEvent event)
{
try
{
Transferable transferable = event.getTransferable();
if (transferable.isDataFlavorSupported(
DataFlavor.javaFileListFlavor))
{
event.acceptDrop(DnDConstants.ACTION_COPY);
event.getDropTargetContext().dropComplete(true);
}
else
{
event.rejectDrop();
}
}
catch (Exception ex)
{
if (logger.isDebugEnabled())
logger.debug("Unable to drop label.", ex);
event.rejectDrop();
}
}
/**
* A <code>DragGestureRecognizer</code> has detected
* a platform-dependent drag initiating gesture and
* is notifying this listener
* in order for it to initiate the action for the user.
* <P>
* @param dragGestureEvent the <code>DragGestureEvent</code> describing
* the gesture that has just occurred
*/
public void dragGestureRecognized(DragGestureEvent dragGestureEvent)
{
if (file == null)
{
// Nothing selected, nothing to drag
getToolkit().beep();
}
else
{
FileTransferable transferable = new FileTransferable(file);
dragGestureEvent.startDrag( DragSource.DefaultCopyDrop,
transferable,
this);
}
}
public void dragDropEnd(DragSourceDropEvent DragSourceDropEvent) {}
public void dragEnter(DragSourceDragEvent DragSourceDragEvent) {}
public void dragExit(DragSourceEvent DragSourceEvent) {}
public void dragOver(DragSourceDragEvent DragSourceDragEvent) {}
public void dropActionChanged(DragSourceDragEvent DragSourceDragEvent) {}
public void dragExit(DropTargetEvent dropTargetEvent) {}
public void dragOver(DropTargetDragEvent dropTargetDragEvent) {}
public void dropActionChanged(DropTargetDragEvent dropTargetDragEvent) {}
/**
* File transferable.
*/
@SuppressWarnings("deprecation") //can't find an alternative.
private class FileTransferable
extends Vector<File>
implements Transferable
{
final static int FILE = 0;
final static int STRING = 1;
final static int PLAIN = 2;
// Don't have other possibility for now instead of using the deprecated
// plainTextFlavor method.
DataFlavor flavors[] = {DataFlavor.javaFileListFlavor,
DataFlavor.stringFlavor,
DataFlavor.plainTextFlavor};
public FileTransferable(File file)
{
addElement(file);
}
public synchronized DataFlavor[] getTransferDataFlavors()
{
return flavors;
}
public boolean isDataFlavorSupported(DataFlavor flavor)
{
boolean b = false;
b = b | flavor.equals(flavors[FILE]);
b |= flavor.equals(flavors[STRING]);
b |= flavor.equals(flavors[PLAIN]);
return (b);
}
public synchronized Object getTransferData(DataFlavor flavor)
throws UnsupportedFlavorException, IOException
{
if (flavor.equals(flavors[FILE]))
{
return this;
}
else if (flavor.equals(flavors[PLAIN]))
{
return new StringReader(file.getAbsolutePath());
}
else if (flavor.equals(flavors[STRING]))
{
return (file.getAbsolutePath());
}
else
{
throw new UnsupportedFlavorException(flavor);
}
}
}
}
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