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Selective DND using isEnabled? [message #239530]

Thu, 01 November 2007 22:51

Adam Cabler

Messages: 113
Registered: July 2009

Senior Member

Hello,
I am trying to implement some DND operations between my views and GEF
editors. I want to be able to have the cursor updated based on where
things can and can't be dropped. It seems that overridding isEnabled in
the DropTargetListener would be a great place for this, but for some
reason, dragSetData on the DragSource isn't called until after you try
to drop, so event.data is always null at this time. And setting the
data on dragStart has no effect (weird). This seems like a common thing
to do, so I'm sure I'm missing something here...

thanks,
adam

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Re: Selective DND using isEnabled? [message #239536 is a reply to message #239530]

Fri, 02 November 2007 00:38

Adam Cabler

Messages: 113
Registered: July 2009

Senior Member

Of course, posting always means I'll find the answer. Just saw this
from Veronika:

See DropTarget section of :
http://eclipse.org/articles/Article-SWT-DND/DND-in-SWT.html

What you are trying to do is only supported on Windows:

public void dragOver(DropTargetEvent event) {
event.feedback = DND.FEEDBACK_SELECT | DND.FEEDBACK_SCROLL;
if (textTransfer.isSupportedType(event.currentDataType)) {
// NOTE: on unsupported platforms this will return null
Object o = textTransfer.nativeToJava(event.currentDataType);
String t = (String)o;
if (t != null) System.out.println(t);
}
}

AdamC wrote:
> Hello,
> I am trying to implement some DND operations between my views and GEF
> editors. I want to be able to have the cursor updated based on where
> things can and can't be dropped. It seems that overridding isEnabled
> in the DropTargetListener would be a great place for this, but for
> some reason, dragSetData on the DragSource isn't called until after
> you try to drop, so event.data is always null at this time. And
> setting the data on dragStart has no effect (weird). This seems like
> a common thing to do, so I'm sure I'm missing something here...
>
> thanks,
> adam

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