[news.eclipse.platform.swt] Re: Drag and Drop - dragSetData never gets c

[Evan <spam@xxxxxxxxxxx>]

Hi,
 Can you elaborate on what the source of your problem was? I have the 
same problem. I have worked around it by setting my data in the 
dragStart() method.
 In my situation I have overridden ByteArrayTransfer with a class that 
does nothing (all the dragging events are internal to RCP application.)

The ViewerDropAdapter.performDrop method is called correctly, and I 
can't find any problem there, but the dragSetData method never gets 
called. Something to do with my implementation of ByteArrayTransfer I 
suspect, but I have no idea what I did to prevent the sending of the 
dragsetdata event.

Thx,
evan


Thomas Piekarski wrote:
> Hi.
>
> After reading all drag and drop articles, i found out, that dragSetData 
> is not called until the transfer of the data is requested on a drop.
>
> So my mistake was on the drop target (handleDrop) but i was looking for 
> a mistake in the drag source listener.
>
> I got it working now, but i think i will need more help sooner or later ;-)
>
>
> Veronika Irvine wrote:
>
> > What does MyDragSourceListener look like? What does your drop target 
> > look like?
> >
> > Take a look at the following articles:
> >
> > http://www.eclipse.org/articles/Article-SWT-DND/DND-in-SWT.html
> > http://www.eclipse.org/articles/Article-Workbench-DND/drag_drop.html
> >
> >
> > "Thomas Piekarski" <Thomas.Piekarski.nospam@xxxxxx> wrote in message 
> > news:d01f68$go9$2@xxxxxxxxxxxxxxxxxx
> >
> > > Hi.
> > >
> > > I'm trying to drag from a jface Treeviewer to a gef editor.
> > > I'm using the following snippet to add a drag source listener:
> > >
> > > ----
> > > int dndOperations = DND.DROP_COPY | DND.DROP_MOVE;
> > > Transfer[] transfers = new Transfer[] { TextTransfer.getInstance() };
> > > viewer.addDragSupport(dndOperations, transfers, new 
> > > MyDragSourceListener(viewer));
> > > ----
> > >
> > > If i start dragging a tree item, the method dragStart of the listener 
> > > gets called, but dragSetData is never called.
> > > Am i doing something wrong? Is it a bug?
> > >
> > > Greets and thanks
> > >
> > > Btw. i am using eclipse 3.1M4