[Tutor] design question
fomcl at yahoo.com
Fri Sep 10 11:23:07 CEST 2010
I've made a small data entry program where a picture of a hand-written, scanned
form is shown next to several text entries. The design has been largely 'bottom
up', although of course I started with a rough sketch. I started with the
following classes: Menu (responsible for the widget creation), Autocomplete (a
subclass of the tkinter text entry widget which I've found on the internet, I
wanted to keep this intact), Convert (responsible for the conversion/cropping of
the images, which is somewhat tedious) and Events (here's the pain spot: this
has become a mixed bag). Originally, the Events class was supposed to contain
all the commands behind the widgets, but it has slowly gotten more
responsibilities. Notably, all methods that deal with reading/writing the data
also live here. The program is about 500 lines of code now, including blanks.
I'd like to rewrite to entire program so that (1) all classes have just one
responsibility (2) classes connect to as little other classes (so it becomes
easy to e.g. change to another widget set). I'd love to hear some thoughts or
advice on the new design from you (I hope my description wasn't too short). Is
there a specific design pattern that could be used?
One specific, additional question: the program has a title bar that shows
something like "processing file X (1 of 3; 33%)". My colleague suggested to use
the Iterator pattern (gang of four) for this. Is this (a) overkill (b) a simple
opportunity to apply this pattern?
Thank you in advance for your advice!
All right, but apart from the sanitation, the medicine, education, wine, public
order, irrigation, roads, a fresh water system, and public health, what have the
Romans ever done for us?
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Tutor