I have a question on which I'd like to get persepectives concerning MVC. This isn't
strictly a wxPython question, but I'm sure people on this list have dealt with it.
I'm using a DSW to display a tree data structure. I already have a MVC architecture
implemented, with an Observer/proxy class for my Model that runs underlying model
methods and send messages back to the view via pubsub to notify when view updates
are required.
My Observer knows nothing about the view, it just post messages which the view interprets.
The wrinkle is that when I use a DSW, I don't want all the windows to do the same thing. In particular,
I may not want to change the focus in the windows that I am not directly editing. Example: I insert a node
in a particular window. Certainly in that window I want the selected item to be the new node, but in
the other windows I probably want to keep the focus where it was. The problem is that via the mechanism
I am currently using, all windows will get the message to change the focus.
I can think of two ways around this. 1) pass to the Observer the current window, so that it knows to send a
different message to that window or 2) put the "select item" code in the event handler, and don't delegate
that to the Observer.
The first method seems to violate the separation of concerns in MVC. The second seems like it violates
the spirit of MVC since the gui is driving the display state, not the underlying model.
Any opinions? I'd love to hear what people do and how they live with themselves in good conscience.
thanks,
Danny