Questions about app design - OOP with python classes

[adriancico at gmail.com]

Hi

    I am working on a python app, an outliner(a window with a TreeCtrl
on the
left to select a document, and a RichTextBox at the right to edit the
current
doc).

    I am familiarized with OOP concepts and terms but I lack practical
experience
, so any comment/tip/pointer to docs will be welcome.

    So far, I have created a separated class for each important
element of my app
        - the main Frame (cFrmMain)
        - the TreeCtrl
        - the TextCtrl at the right
        - a cDocument class that contains the entire file with all
docs
          and manages creation/deletion/saving to disk, etc
        - classes for the toolbar, the menubar, etc

    With this design, pretty much everything is encapsulated in it
respective
class. However, that means that the main program logic is in the Frame
class.
>From there, it instantiates the other classes and is responsable of
the
communication between them.

    For example, the user deletes a node on the Tree, this raises an
event
on cFrmMain (the main Frame class). In the event handler, cFrmMain
notifies
cDocument that a node (and the associated text) has been deleted so
the master
file is modified accordingly.

    The problem is, I have been implementing some funcionalities to
test this
design, I have less than a dozen operations implemented and cFrmMain
has grown
more than acceptable, starting to get confusing.

    This design feels "not quite right" to me, I've been considering
allowing
the different classes to know of the existence of each other and pass
messages
between them. I would lose encapsulation (I think), and I don't know
if that would be
(very) bad... and I'm not sure if with this design I will gain or lose
clarity on the code.

    My questions ( at last :-) ) are:

    ¿Should I stick to my first design idea, eventually moving code
from the
main Frame to modules to gain clarity?

    ¿Is the second idea I present "correct" (I know it'll work, what I
want to
know is the clearest way of organize my code)?

    ¿Am I doing this wrong from the start and have to use another
design?

Thanks for reading this long post. Any comment, hint or pointer to
docs will
be greatly appreciated.

Regards
Adrián Garrido