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Create graphical elements by create new diagram [message #963181]

Mon, 29 October 2012 12:22

Eclipse User

Hello,

i need some help. I want to create some graphical elements while create a new diagram. This elements are not parts of the model, only a graphical representation. For example it should visualize the user a start point as dot. So i create a dummy class, create an AddFeature and CreateFeature. I tried to trigger the creation of this element inside the DiagramProvider.postInit(), but get an exception:

java.lang.IllegalStateException: Cannot modify resource set without a write transaction

What is the correct approach to this? By create a new diagram, there should be a simple dot as start point inside the diagram?

Regards,
Markus

Re: Create graphical elements by create new diagram [message #964293 is a reply to message #963181]

Tue, 30 October 2012 08:07

Eclipse User

Markus,

you need to execute your features within a write transaction for the
resource set/transactional editing domain. This is due to Graphiti using EMF
Transactions underneath. Simply execute your feature on the command stack of
the editor, there is a executeFeature method in DiagramEditor that does
exactly that.

Michael

Re: Create graphical elements by create new diagram [message #964369 is a reply to message #964293]

Tue, 30 October 2012 09:16

Eclipse User

Thnaks for help. Now it works fine by execute this as command.

Re: Create graphical elements by create new diagram [message #983962 is a reply to message #964369]

Wed, 14 November 2012 04:34

Eclipse User

Hi Michael,

I am also getting same error and as per your suggestion I try to execute my add feature on the command stack of editor using executeFeature method in DiagramEditor.

The following assert in DiagramEditor gives me Nullpointer Error:

DefaultEditDomain domain = getEditDomain();

        // Make sure the editor is valid
        Assert.isNotNull(domain);

Is there something that I am missing?

Re: Create graphical elements by create new diagram [message #985797 is a reply to message #983962]

Fri, 16 November 2012 03:34

Eclipse User

Hemlata,

it seems that the editor is not correctly initialized. This method will only
work with a correctly opened editor. How do you retrieve that editor?

Michael

Re: Create graphical elements by create new diagram [message #985842 is a reply to message #985797]

Fri, 16 November 2012 05:58

Eclipse User

I use following stuff to create my diagram and open it :

IWorkbenchPage page = PlatformUI.getWorkbench()
                    .getActiveWorkbenchWindow().getActivePage();

      IEditorInput input = getEditorInput();
     
      // Create the pictogram for selected object

      final Diagram diagram = Graphiti.getPeCreateService()
                    .createDiagram(DIAGRAM_TYPE, object.getName(),
                            false);
       DiagramEditor editor = new DiagramEditor();
       
       final DiagramTypeProvider dtyProvider = (DiagramTypeProvider) ExtensionManager
                    .getSingleton().createDiagramTypeProvider(
                            DIAGRAM_TYPE_PROVIDER_ID);

       dtyProvider.init(diagram, editor);
         
       page.openEditor(input, DiagramEditor.DIAGRAM_EDITOR_ID);

and the getEditorInput() is as follows:

public static IEditorInput getEditorInput() throws Exception {

        DiagramEditorInput result = null;

        final IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();

        final IProject project = root.getProject("Graphiti");

          IFile diagramFile = project.getFile("Test" + "." + "diagram");

        URI emfURI = URI.createURI(diagramFile.getFullPath().toString());
     
            if (emfURI != null) {

            URI diagramUri = emfURI.appendFragment("/0");

            result = new   DiagramEditorInput(diagramUri,
                         DiagramTypeProvider.DIAGRAMTYPE_PROVIDER_ID);
       
        }

        return result;
    }

Re: Create graphical elements by create new diagram [message #986729 is a reply to message #985842]

Wed, 21 November 2012 08:23

Eclipse User

Hemlata,

why do you construct a DiagramEditor by yourself? All you should need to do
is create a DiagramEditorInput instance and pass it to
page.openEditor(input, DiagramEditor.DIAGRAM_EDITOR_ID);

The diagram needs to be persisted in file.

Michael

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