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Drag'n'Drop copies object instead of moving it [message #1749491]

Wed, 07 December 2016 10:47

Roman Zimmer

Messages: 27
Registered: November 2010

Junior Member

Hey @ll,

in our e4 RCP application we use EMF Parsley for displaying structured data in a tree viewer. Thanks to the ViewerDragAndDropHelper, we get nice a nice drag'n'drop experience out of the box:

ViewerDragAndDropHelper dragAndDropHelper = injector.getInstance(ViewerDragAndDropHelper.class);
EditingDomain editingDomain = injector.getInstance(EditingDomain.class);
dragAndDropHelper.addDragAndDrop(structuredViewer, editingDomain);

(structuredViewer is a normal JFace TreeViewer)

Given the following data:

index.php/fa/27806/0/

When I drag Child 1 "inside" Parent 1, it works just fine and as expected, i.e. I can move it before or after Child 2, holding CTRL I can copy the object.

When I drag Child 1 inside Parent 2, it allows me only to copy the element, i.e. moving (=changing Child 1's parent from Parent 1 to Parent 2) is not possible.

Any idea, what I might doing wrong? Should this be supported out of the box? Might this result from a problem in my ecore-model? Can I workaround the issue or is this a bug?

Any help is appreciated, thanks a lot in advance!

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Re: Drag'n'Drop copies object instead of moving it [message #1749852 is a reply to message #1749491]

Tue, 13 December 2016 09:05

Lorenzo Bettini

Messages: 1812
Registered: July 2009
Location: Firenze, Italy

Senior Member

Hi Roman

I would tend to say that this is due to some constraint in your ecore model, since the default implementation of drag and drop in Parsley is simply delegating to the default one of EMF.
If you open your model with the standard EMF editor do you get the same behavior?

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Re: Drag'n'Drop copies object instead of moving it [message #1750298 is a reply to message #1749852]

Mon, 19 December 2016 17:12

Roman Zimmer

Messages: 27
Registered: November 2010

Junior Member

Hey Lorenzo,
thanks for your reply! It resulted that we used the EditingDomain returned by the injector and not the one assigned to our domain model. Using the latter one, drag'n'drop seems to work flawless now.

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