Correct abstraction for TK

Adonis Vargas adonis at REMOVETHISearthlink.net
Tue Jul 3 00:33:28 CEST 2007


luke.hoersten at gmail.com wrote:
> I'm looking for a good example of how to correctly abstract TK code
> from the rest of my program. I want to just get some user info and
> then get 4 values from the GUI. Right now I've written it OOP per the
> examples on python.org but it doesn't seem to be meshing very well
> with the rest of my project.
> 
> Can anyone suggest some examples so that I can get more ideas?
> 
> Thanks,
> Luke
> 

I would not consider this to be 'correct' as many have different 
philosophies on how to tackle certain projects. My way of doing 
programming with GUI is writing it in 'tiers' (using this word loosely).

i.e.

import Tkinter as tk

class UsersInfo:

     pass

class Events(UserInfo):

     pass

class GUI(Events):

     pass

This way your GUI class sends events to the Events class to act upon the 
UserInfo class. For the GUI class here all you do is code the actual 
display and the callbacks only. Then in the Events class you code the 
actions you want to happen when you interact the the GUI. Since the GUI 
class inherits the Events class, in the GUI class you would simply call 
a method found in the Events class when an event is triggered. Now the 
Events class which inherits the UserInfo class, you can start using the 
class to store/modify the user data you desire. Now your code is 
separated into more comprehensible, and easier to manage sections. In 
this example I am using inheritance, but if you prefer delegation, then 
that too can be done here. Also, by doing this it will simplify the 
moving to more robust graphic toolkits with little modification.

Hope this helps.

Adonis



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