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Tree Representation: delete sub-element reference [message #1804480]

Tue, 26 March 2019 16:36

Mars Keez

Messages: 16
Registered: January 2015

Junior Member

Hi All

I have an "Entity" inside a "SubSpace" within a tree representation (as in the pic enclosed). The Subspace is not the Container of the entity, it only refers to it. Now I want to "delete" the Entity from the Subspace, i.e. I want to remove the reference from SubSpace to Entity by an unset of the refering variable of SubSpace.

How can I achieve this, when I only have the (semantic) "element" and "root" variables in the delete tool?

In other tools I have additionaly a container variable, that would make this an easy thing to do. But in delete I don't have this - for some reason?

Thx in advance
make

PS
best solution so far: disable Delete and write Creation tool to unassign Entity

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Re: Tree Representation: delete sub-element reference [message #1804544 is a reply to message #1804480]

Thu, 28 March 2019 14:36

Maxime Porhel

Messages: 516
Registered: July 2009
Location: Nantes, France

Senior Member

Hi Mars,

Unfortunately, these containerView or view variables are not present in the context of a Tree Item Delete Tool.
I suggest you to create a bugzilla there: https://bugs.eclipse.org/bugs/enter_bug.cgi?product=Sirius

The following workaround should work: you need to implement your tool with a java service.

Then you will be able to get the DTreeItem which is currently deleted:

ISelection selection = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getSelectionService().getSelection();
 if (selection instanceof TreeSelection && ((IStructuredSelection) selection).size() == 1) {  //IStructuredSelection
          Object firstElement = ((IStructuredSelection) selection).getFirstElement();

Then you should check that it is an instanceof DTreeItem:
- getContainer() will allow you to get the parent element (tree item or tree)
- getOwnedTreeItems() returns the list of DTreeItem children
- getTarget allows you to get the corresponding domain element (for the current selection, it will correspond to the value of the element variable)

Then you should be able to retrieve your SubSpace and remove the entity from the wanted reference.

Regards,

Maxime Porhel - Obeo

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