[news.eclipse.modeling.gmf] Adding custom Decorators on diagram nodes

[subapriya.nagarajan@xxxxxx (Subapriya Nagarajan)]

Hi,

I'm trying to add decorators to the nodes in a diagram editor based on 
some custom validation that is done, for example, I have created some 
validation on how the entities on the diagram should be named, ie, follow 
some naming convention. I would like the error decorators (like images 
appear on problem view markers) to appear when there is a change made to 
the name of the entity on the diagram and the model is saved, based on the 
custom validation. Here is my extension point:

<extension point="org.eclipse.gmf.runtime.diagram.ui.decoratorProviders">  
   <decoratorProvider 
class="com.s1.pmt.prod.businessspecification.gmf.editor.providers.ErrorDecoratorProvider">
        <Priority name="Lowest"/>
     </decoratorProvider>
  </extension>


I have the 'ErrorDecoratorProvider' class implement the IDecoratorProvider 
interface. I see that the decorator service is invoked only when user 
performs something which is an operation, ie,

public boolean provides(IOperation operation) {
			}

and not when user makes changes to the names of the entities (which are 
property change 'events' and not 'operation'). Is there a way to invoke 
the decorator service on the events as opposed to operations alone? Your 
answer is appreciated. Thanks.