Drag and Drop in JTable never gets DropTargetListener events

Question

I'm trying to implement Drag/Drop between two JTables. I have adapted the source from the Drag/Drop Tutorial but none of the DropTargetListener events get called. When I try to drag a row from one table to the other, the debug output is as follows:
beginning drag : ROW 3
dragsource : dragExit
dragsource : dragDropEnd
I'm using JDK 1.3. Any help would be appreciated, here is the source:
public class DnDTable extends JTable implements DropTargetListener, DragSourceListener, DragGestureListener
public DnDTable(Object[][] rowData,Object[] columnNames)
super(rowData,columnNames);
m_dropTarget = new DropTarget(this,this);
m_dragSource = new DragSource();
m_dragSource.createDefaultDragGestureRecognizer(this,DnDConstants.ACTION_MOVE,this);
public void dragEnter(DropTargetDragEvent event)
System.out.println("droptarget : dragEnter");
event.acceptDrag(DnDConstants.ACTION_MOVE);
public void dragExit(DropTargetEvent event)
System.out.println("droptarget : dragExit");
public void dragOver(DropTargetDragEvent event)
System.out.println("droptarget : dragOver");
public void drop(DropTargetDropEvent event)
System.out.println("droptarget : drop");
try
Transferable transferable = event.getTransferable();
// we accept only Strings
if (transferable.isDataFlavorSupported(DataFlavor.stringFlavor))
event.acceptDrop(DnDConstants.ACTION_MOVE);
String s = (String)transferable.getTransferData(DataFlavor.stringFlavor);
setValueAt(s,rowAtPoint(event.getLocation()),0);
event.getDropTargetContext().dropComplete(true);
else
event.rejectDrop();
catch(IOException exception)
exception.printStackTrace();
System.err.println( "Exception" + exception.getMessage());
event.rejectDrop();
catch(UnsupportedFlavorException ufException )
ufException.printStackTrace();
System.err.println( "Exception" + ufException.getMessage());
event.rejectDrop();
public void dropActionChanged(DropTargetDragEvent e)
public void dragGestureRecognized(DragGestureEvent event)
int nDragRow;
Object object;
nDragRow = getSelectedRow();
object = getValueAt(nDragRow,0);
if (object != null )
System.out.println("beginning drag:" + object.toString());
StringSelection text = new StringSelection(object.toString());
m_dragSource.startDrag(event,DragSource.DefaultMoveDrop,text,this);
else
System.out.println("nothing was selected");
public void dragDropEnd(DragSourceDropEvent event)
System.out.println("dragsource : dragDropEnd");
public void dragEnter(DragSourceDragEvent event)
System.out.println("dragsource : dragEnter");
public void dragExit(DragSourceEvent event)
System.out.println("dragsource : dragExit");
public void dragOver(DragSourceDragEvent event)
System.out.println("dragsource : dragOver");
public void dropActionChanged(DragSourceDragEvent event)
System.out.println("dragsource : dropActionChanged");
DropTarget m_dropTarget;
DragSource m_dragSource;

Answer 1

Hi My friend,
The code you have took will perfectly works.
I have an option please try this.
Instead of DnDConstants.ACTION_MOVE try DnDConstants.ACTION_COPY.
Lakshmi.