[gmf-dev] Model - Diagram Programmatic Modifications

[Stavros Isaiadis <s.isaiadis@xxxxxxxxx>]

Hi all,

I have created a simple model and editors to represent software components
as simple boxes. What I would like to do is programmatically change the
model and be able to view the results in the open diagram. So for example,
through a menu item the user could select to add a new sub-component in the
selected component. Such a change should be immediately visible in the (now
dirty) diagram.

My current course of action is roughly the following:

- get the active diagram editor.
- retrieve the editingdomain from the editor
- get the root component/box
- create a Command to add or remove a new component/box
- use the editingDomain to execute the command

However this does not work for me. No changes happen in the diagram. I am
relatively new to GMF and would greatly appreciate any help or ideas at all.

I am attaching a simplified version of my code here:

//Get the active editor and current selection
IWorkbenchWindow workbenchWindow = workbench.getActiveWorkbenchWindow();
IEditorPart ep = workbenchWindow.getActivePage().getActiveEditor();
ISelection s = workbenchWindow.getActivePage().getSelection();

final IEditorPart activeE = ep;
final ISelection activeS = s;

WorkspaceModifyOperation operation =
	new WorkspaceModifyOperation() {
		@Override
		protected void execute(IProgressMonitor progressMonitor) {
			try {
				// Get the editingDomain
				EditingDomain ed = null;
				//ComponentType is my model for the components
				ComponentType root = null;
				
				if (activeE instanceof MyModelEditor){
					ed = ((MyModelEditor)activeE).getEditingDomain();
				}
				
				ResourceSet resourceSet = ed.getResourceSet();

				for (Iterator<Resource> it = resourceSet.getResources().iterator();
it.hasNext(); ){
					Resource current = it.next();
					if (current instanceof MyModelResourceImpl){
						root =
((ComponentType)((MyModelResourceImpl)current).getContents().get(0)).getComponent();
					}					
				}
				
				RemoveCommand cmd = new RemoveCommand(ed, root,
MyModelPackage.eINSTANCE.getComponentType_Component(), root.getComponent());
				ed.getCommandStack().execute(cmd);		
				
			}
			catch (Exception exception) {
				...
			}
			finally {
				progressMonitor.done();
			}
		}
	};

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