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Top level node auto-created on diagram initialization that can not be deleted later [message #799008]

Wed, 15 February 2012 10:29

Michael Golubev

Messages: 383
Registered: July 2009

Senior Member

This topic was extracted from question in this thread:

When i create a new "diagram" inside the GMF editor, i should create a config object. Here is the simple ecore model:

- class diagram
reference (1...1) conf: Config

- class config

What is the best way to create some new containing object automatically while creating a new diagram so this will be shown by startup in the plain diagram as a rectangle. How i can avoid the deletion of this object because a diagram must always contain this auto-created object?

[Updated on: Wed, 15 February 2012 10:29]

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Re: Top level node auto-created on diagram initialization that can not be deleted later [message #799031 is a reply to message #799008]

Wed, 15 February 2012 10:58

Andreas Muelder

Messages: 73
Registered: July 2011

Member

Hi Michael,

I have a simiar usecase in my project. I made a custom CreationWizard that creates the semantic and notation elements initialy. Maybe this code is a starting point for you

To avoid the deletion of an object, I did the following steps:

1. Disables deletion for multi selection
Override the SemanticEditPolicy and return false for method shouldProceed(DestroyRequest request)
2. disable deletion via kyeboard (This is unfortunatelly handled in a different way in GMF)
Override the ComponentEditPolicy and return an Unexecutable Command
in method createDeleteCommand() or install the RootComponentEditPolicy

Hope this helps,
Andreas

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Re: Top level node auto-created on diagram initialization that can not be deleted later [message #799107 is a reply to message #799031]

Wed, 15 February 2012 13:05

Markus Knoop

Messages: 14
Registered: January 2012

Junior Member

Hello,

thanks for help, this solution mostly works. I create the configuration object while create a new diagram. I return the UnexecutableCommand in the methode getDestroyElementCommand. I can't delete the model object, but i can delete the figure object inside the diagram by pressing the delete key. If i close the diagram and re-open again the config figure is still there and contains all settings made before.

Regards,
Markus Knoop

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Re: Top level node auto-created on diagram initialization that can not be deleted later [message #799121 is a reply to message #799107]

Wed, 15 February 2012 13:23

Andreas Muelder

Messages: 73
Registered: July 2011

Member

Hi Markus,
I used the following code in the edit part of the undeleteable element. This worked for me:

protected void createDefaultEditPolicies() {
   super.createDefaultEditPolicies();
   installEditPolicy(EditPolicy.COMPONENT_ROLE,	new RootComponentEditPolicy());
}

Andreas

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