[news.eclipse.modeling.gmf] How to call own layoutProvider from "Arrange

[Martin Jacob <mj@xxxxxxxxxxxxxx>]

Hi everyone,

I was searching on the mailing list but did  not find a sufficient answer fop my problem.

I want to use my own layoutProvider while using the already existing menu item "Arrange All".


I did the following things so far:

1. Add the extension point, see below:

<extension name="PSC Viewer Layout Provider" point="org.eclipse.gmf.runtime.diagram.ui.layoutProviders">
   <layoutProvider class="ui.diagram.providers.LayoutProvider">
      <Priority name="Highest">
      </Priority>
   </layoutProvider>
</extension>


2. Create a class derived from org.eclipse.gmf.runtime.diagram.ui.services.layout.AbstractLayoutNodeProvider

public class PscViewerLayoutProvider extends AbstractLayoutNodeProvider {

public Runnable layoutLayoutNodes(List layoutNodes,
		boolean offsetFromBoundingBox, IAdaptable layoutHint) {
	System.out.println("layoutNodes: "+layoutNodes.toString());
	System.out.println("offsetFromBoundingBox: "+offsetFromBoundingBox);
	System.out.println("layoutHint: "+layoutHint.toString());
	return null;
}

public boolean provides(IOperation operation) {
	System.out.println(""+operation.toString());
	if (operation instanceof org.eclipse.gmf.runtime.diagram.ui.services.layout.ILayoutNodeOperation) {
		System.out.println("true");
		return true;
	}
	System.out.println("false");
	return false;
}
}

I would expect to see at least the println while calling "Arrange All". But I don't see any thing at System.out!

Does any one could please give me a hint how to solve the problem?

Thanks, Martin