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[DND] Drop business object from external TableViewer [message #881375]

Mon, 04 June 2012 12:37

Erdal Karaca

Messages: 854
Registered: July 2009

Senior Member

I am trying to drop a business object from an 'external' TableViewer, i.e. in a workbench part outside the DiagramEditor. When entering the diagram area, the DROP operation does not change, i.e. I cannot drop the object.

What SWT Transfer do I have to use? Or how do I have to configure the TableViewer to be able to drop its selection onto the diagram?

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Re: [DND] Drop business object from external TableViewer [message #881756 is a reply to message #881375]

Tue, 05 June 2012 07:57

Henning Losert

Messages: 5
Registered: March 2012

Junior Member

Hi Erdal,

I have something similar for my Graphiti editor: I have an "external" view with some TableViewers that show certain business objects in my model that I can then drag onto the diagram to initiate certain actions.

The code to enable drag support on my TableViewers looks like this:

this.tblv.addDragSupport(DND.DROP_MOVE | DND.DROP_COPY, new Transfer[] { LocalSelectionTransfer.getTransfer() },
				new DragSourceAdapter() {

					@Override
					public void dragStart(DragSourceEvent event) {
						LocalSelectionTransfer.getTransfer().setSelection(CatalogView.this.tblv.getSelection());
					}
			
				});

I use the LocalSelectionTransfer, as you can see, and just pass it the selection of my TableViewer.

What you also need is an AddFeature in your Graphiti editor for the kind of business object you're trying to drop. In that AddFeature, you can use the canAdd(IAddContext context) method to implement a check whether the business object should be "droppable" at the desired location, for example by checking the target container of the given context.

I hope this helps you in any way.

Cheers
Henning

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