[news.eclipse.platform.swt] Re: DND with two different costum classes

[duongn@xxxxxxxxxx (Duong Nguyen)]

Without some sample code, I'm not sure if I understand what you're doing.

You don't need to override isSupportedType to check for Foo or Bar. The 
DropTargetAdapter and the DragSourceAdapter typically does not need to 
check for instanceof Foo or Bar either.

FooTransfer and BarTransfer should implement validate(Object). You should 
check whether the Object is Foo or Bar respectively in this method.

You can look at Snippet79 or Snippet171 for some custom transfer types.

Duong

Moritz Kreutzer wrote:

> Hi everyone,
> in my RCP app I want to implement a DND-mechanism in which i want to 
> transfer objects of two different costum classes (Foo and Bar). I already 
> implemented FooTransfer and BarTransfer which both extend 
> ByteArrayTransfer. 
> I also implemented a DropTargetAdapter (which is checking for the class 
> via (Foo|Bar)Transfer.getInstance().isSupportedType(event.currentDataType) 
> in drop()) and a DragSourceAdapter (which is checking via * instanceof 
> (Foo|Bar)).
> They seem to work fine.
> But, anyway, the whole mechanism doesn't work.
> It seems like there is FooTransfer called everytime even if I want to 
> transfer a Bar.
> My question: How do I "connect" the classes to the Transfer types?
> (I already had a look at isSupportedType(TransferData) but I don't 
> understand how to check the TransferData for a class.)
> Or how does this work at all?
> Thanks in advance.

> Regards, Moritz.