[news.eclipse.platform.swt] support multiple transfer in DND

[yulian@xxxxxxxxxxxxxxxx (Yulian)]

Hi, all

I am trying to add DND support for my tree view. In my tree there are 
three types of node, and I want to differentiate them during drag and 
drop. So I implement three Transfer class. And add the Transfer array of 
the three transfers to the TreeViewer. However, I find that no matter 
which object I am trying to drag, in the method  

public void dragSetData(DragSourceEvent event)

event.dataType always be the type of the first transfer in the Transfer 
array. And I can't find any place to set the dataType.

Does anyone have some idea?

Thanks in advance!

Yulian