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Passing data between ViewerDropAdapter and DragSourceListener [message #1691265]

Sat, 04 April 2015 08:48

Cédric Moonen

Messages: 14
Registered: December 2014

Junior Member

Hello,

I implemented DnD in my application by imlementing DragSourceListener and extending ViewerDropAdapter. This works fine but in my application, the elements that are dragged have a multiplicity. In the drop() method, I display a dialog to the user asking him how many elements have to be moved.

I would like to pass this number from my ViewerDropAdapter towards my DragSourceListener, since I would like the DragSourceListener to implement the remove of the elements in the source widget.

I currently implement everything in my ViewerDropAdapter, but this is growing more and more complex between I can have multiple sources for the elements to be dragged and several targets as well. Decoupling the drag behavior from the drop behavior would help a lot in reducing the complexity (this would avoir having to handle all combination of sources and targets).

I though that this would be feasible by passing some custom data in the event but apparently this is not the case (there's no field for custom data).

Any idea how I can implement this?

Thanks,
Cédric

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Re: Passing data between ViewerDropAdapter and DragSourceListener [message #1691322 is a reply to message #1691265]

Sun, 05 April 2015 23:48

Eclipse User

I would use the LocalSelectionTransfer and transfer a custom object in which you place this multiplicity information or whatever else is needed.

Brian.

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Re: Passing data between ViewerDropAdapter and DragSourceListener [message #1691340 is a reply to message #1691322]

Mon, 06 April 2015 08:48

Cédric Moonen

Messages: 14
Registered: December 2014

Junior Member

Hi Brian,

Thanks for the reply. I actually solve my problem another way: I extended LocaSelectionTransfer to have an additional quantity field. This seems to work fine as well.

Thanks,
Cédric

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Re: Passing data between ViewerDropAdapter and DragSourceListener [message #1691355 is a reply to message #1691340]

Mon, 06 April 2015 13:40

Eclipse User

That's fine as long as you're prepare to maintain your parallel branch. It's not a very maintainable solution, IMHO. Creating your own ISelection is a much better solution long-term.

Brian.

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