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PropertyChangeListener in new View [message #1218639]

Fri, 29 November 2013 06:11

Eclipse User

Hi!

I'm writing a new view which should be notified of selection changes or property changes (for instance a name change) in the editor or properties view.

The selection changes are already handled in my view:

ISelectionListener listener = new ISelectionListener() {
      	
		@SuppressWarnings("restriction")
		public void selectionChanged(IWorkbenchPart part, ISelection sel) {
      		if (sel instanceof IStructuredSelection) {
			IStructuredSelection ss = (IStructuredSelection) sel;
			Object o = ss.getFirstElement();
				
	        	if (o instanceof ContainerShapeEditPart) {
	        		ContainerShapeEditPart editPart = (ContainerShapeEditPart) o;
	        		IFeatureProvider fp = editPart.getFeatureProvider();
	        		selection = fp.getBusinessObjectForPictogramElement(editPart.getPictogramElement());
	        		castElement();
	        		createSuggestions();
	        	}
	        	else {
	        		generateErrorInstruction(part, sel);
	        	}
...

public void createPartControl(Composite parent) {

     ...
     getSite().getWorkbenchWindow().getSelectionService().addSelectionListener(listener);
     ...
}

Is there a way to get notified of property changes like that?
For instance: the moment you start typing a new name for an element in the diagram, I'd like to be notified.
Should I extract the name label of the selection and add a listener at that point? How should i go about this?

Thanks in advance.

Re: PropertyChangeListener in new View [message #1219201 is a reply to message #1218639]

Mon, 02 December 2013 10:33

Eclipse User

Hi,

in order to achieve that you will have to register EMF Adapters to the
EObjects you want to observe. They will get notified as soon as the object
or its attributes change. There are numerous tutorials in the Web, e.g.
http://www.vogella.com/articles/EclipseEMFNotification/article.html

Michael

Re: PropertyChangeListener in new View [message #1219467 is a reply to message #1219201]

Tue, 03 December 2013 21:15

Eclipse User

Thank you Michael!

You pointed me in the right direction.

If other people come across this problem, register a listener to your EObject like this:

((EObject)selection).eAdapters().add(new AdapterImpl() {
    
    @Override
    public void notifyChanged(Notification msg) {
    // Execute change reaction code.
    }

});

[Updated on: Wed, 04 December 2013 03:33] by Moderator

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