I'd love to have operations methods, which would return names of operations and references to proper methods. The problem is that certain operations require more, than just running some operation on the Group or Element. Let's say, you want to add new group to an existing one - you can't do that to an element. But adding a group cannot be just done by calling group.addGroup. You must first construct the group or at least get information require to construct a group, so you must for example call a dialog which will ask for information about the group. And that's in conflict with model/view pattern.
And that's not all. I am using qt and when I want to add this group to another one, I have to first call beginInsertRows on the model used by the tree view (it's a layer between the gui and the real model). I tried building a wrapper around my model which would provide additional info, but then I had to keep relations between objects in two places (relations between real groups and elements and wrapper groups and wrapper elements), which wasn't the right way to do. I just can figure a simple, elegant way to do this. -- Filip Gruszczyński -- http://mail.python.org/mailman/listinfo/python-list