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How to execute an action after the diagram is loaded or a connection/link is deleted [message #893138]

Mon, 02 July 2012 16:31

Eclipse User

Hi GMF Experts,

I need your help. I just like to ask how do you call an action/command after all the figures in the diagram is loaded and also call a command after you create or delete a figure.

Basically, what I would like to call is the Validate function in GMF. I want to validate the model after the diagram is loaded, a figure is created and deleted.

Is this possible? what code needs to be changed?

Thanks again!

Che

Re: How to execute an action after the diagram is loaded or a connection/link is deleted [message #893242 is a reply to message #893138]

Tue, 03 July 2012 06:30

Eclipse User

Hi,

you can override createPartControl in xxxDiagramEditor to react on the diagram opening. There you can also start listening to changes by using a ResourceSetListener.

TransactionUtil.getEditingDomain(getDiagram().getElement()).addResourceSetListener(YourResourceSetListenerImplementation)

Ralph

Re: How to execute an action after the diagram is loaded or a connection/link is deleted [message #893395 is a reply to message #893242]

Tue, 03 July 2012 16:25

Eclipse User

Thanks Ralph!

I was able to run Validation when the diagram opens. It works perfect.

However, for my listener implementation, I extended the ResourceSetListenerImpl and I see during runtime, when I added a new line/connection in the diagram, the method resourceSetChanged(Event) is being called 5 times. There are also different combinations of notifications in the event object.

If I put the code to call my ValidationAction here, it will be called 5x.

Would you know if there's a better way to do it? Or am I doing it incorrectly?

Basically, I'd like to call Validation everytime I create or delete a line in the diagram.

Thanks!
Che

Re: How to execute an action after the diagram is loaded or a connection/link is deleted [message #893674 is a reply to message #893395]

Thu, 05 July 2012 04:20

Eclipse User

Hi,

you need to filter for the notification you are interested in (event.getNotifications()). You can do this by something like this:

if (notification.getNotifier() instanceof AAAA)
  execute validation;

You can also listen to changes in an EMF model via an EContentAdapter (http://wiki.eclipse.org/EMF/Recipes#Recipe:_Use_EContentAdapter_to_receive_notifications_from_a_whole_containment_tree) or by overriding the handleNotification method of you EditParts. However, these will have the same problem of getting called multiple times.

Ralph

Re: How to execute an action after the diagram is loaded or a connection/link is deleted [message #894084 is a reply to message #893674]

Fri, 06 July 2012 10:55

Eclipse User

Thanks Ralph!

Yeah, I think I'm just going to add the filters.

Thanks again for your help! Smile

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