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How to reuse the same layout provider recursively on a diagram [message #1766017]

Wed, 14 June 2017 19:10

Chris Mamorella

Messages: 34
Registered: June 2013

Member

I have a model which contains recursive elements. For example, a container of elements which themselves can be containers.

I have a layout algorithm to arrange the children in any given container, but I would like to be able to reapply the same layout to each child as well.

From the diagram user end, I could accomplish this by selecting the deepest child container first and applying "arrange all" on that selection. Then reapplying on the parent container and so forth all containers have been touched.

Is there a layout provider scheme that supports this notion of walking through the diagram parts and recursively applying the same layout provider depending on the part type? "Arrange all" only provides 1 selection by default (the root edit part of the diagram), so that's the use case I'd prefer to work with.

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Re: How to reuse the same layout provider recursively on a diagram [message #1766241 is a reply to message #1766017]

Mon, 19 June 2017 08:26

Pierre-Charles David

Messages: 703
Registered: July 2009

Senior Member

Hi,

There is no direct support for this, but if your algorithm is invoked from the diagram's root edit, you should be able to walk inside the diagram's recursive structure by yourself and invoke your algorithm on each relevant container.

You'll need to use EditPart.getChildren() to walk inside the structure. Sirius EditParts are all instances of org.eclipse.sirius.diagram.ui.edit.api.part.IDiagramElementEditPart, from which you can easily obtain the underlying semantic element (resolveTargetSemanticElement) and the Sirius graphical element (resolveDiagramElement). From a DDiagramElement, getMapping() will tell you what kind of element it corresponds to in your VSM. From all this you should be able to determine on which edit parts your algorithm should be invoked.

Regards,
Pierre-Charles David

Pierre-Charles David - Obeo

Need training or professional services for Sirius?
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