[vtkusers] Events vs subclasses

[David Doria]

Can anyone explain when you would want to subclass an interactor style and
when you would want to use events?

For example, say you are trying to select a region with
vtkInteractorStyleRubberBand2D (get the corners of the box that the rubber
band draws). You could
1) create a subclass and override OnLeftButtonDown(), etc
2) use the class itself, but handle the SelectionChangedEvent that it
produces.

Are there benefits/downsides to each of these methods?

Thanks,

David
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