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TransferDropTargetListener [message #16001]

Mon, 29 July 2002 06:17

Eclipse User

Hi,

I'm trying to add two TransferDropTargetListeners to an
AbstractEditPartViewer (like in the logic example).
If I execute this code:

getGraphicalViewer().addDropTargetListener(new
OccurrenceTransferDropTargetListener(getGraphicalViewer(),
FileTransfer.getInstance()));
getGraphicalViewer().addDropTargetListener(new
TextTransferDropTargetListener(getGraphicalViewer(),
TextTransfer.getInstance()));

only the FileTransfer will work. Swaping the two adds only
the TextTransfer will work.

In the AbstractEditPartViewer Code only the first add triggers an
refreshDropTargetAdapter():

public void addDropTargetListener(TransferDropTargetListener listener)
{
if (getDelegatingDropAdapter().isEmpty()) {
// The DropTarget needs to be created and initialized
getDelegatingDropAdapter().addDropTargetListener(listener);
refreshDropTargetAdapter();
}
else {
// The DropTarget should already be set up.
getDelegatingDropAdapter().addDropTargetListener(listener);
}
}

Without the call to refreshDropTargetAdapter() the DropTarget will only
work for the type of Transfer in the first add.

Is there an bug in GEF XOR in my Code to fix?

thanks
Juergen

Re: TransferDropTargetListener [message #16020 is a reply to message #16001]

Mon, 29 July 2002 11:51

Eclipse User

This is a GEF bug. The if...else... in addDropTargetListener() should be
replaced by the code inside the if part, so that refreshDropTargetAdapter() is
always called.

Eric

"Juergen King" <j.king@alturatec.de> wrote in message
news:3D45164E.8020403@alturatec.de...
> Hi,
>
> I'm trying to add two TransferDropTargetListeners to an
> AbstractEditPartViewer (like in the logic example).
> If I execute this code:
>
> getGraphicalViewer().addDropTargetListener(new
> OccurrenceTransferDropTargetListener(getGraphicalViewer(),
> FileTransfer.getInstance()));
> getGraphicalViewer().addDropTargetListener(new
> TextTransferDropTargetListener(getGraphicalViewer(),
> TextTransfer.getInstance()));
>
> only the FileTransfer will work. Swaping the two adds only
> the TextTransfer will work.
>
> In the AbstractEditPartViewer Code only the first add triggers an
> refreshDropTargetAdapter():
>
> public void addDropTargetListener(TransferDropTargetListener listener)
> {
> if (getDelegatingDropAdapter().isEmpty()) {
> // The DropTarget needs to be created and initialized
> getDelegatingDropAdapter().addDropTargetListener(listener);
> refreshDropTargetAdapter();
> }
> else {
> // The DropTarget should already be set up.
> getDelegatingDropAdapter().addDropTargetListener(listener);
> }
> }
>
> Without the call to refreshDropTargetAdapter() the DropTarget will only
> work for the type of Transfer in the first add.
>
> Is there an bug in GEF XOR in my Code to fix?
>
> thanks
> Juergen
>

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