AVC: Simplifying your GUI Code

Note: This article was first published the April 2008 issue of Python Magazine

By: Mark Mruss

GUI programming, like many other types of programming, can sometimes prove exhausting because you must repeat yourself over and over again. AVC is one tool available to Python GUI programmers that attempts to simplify things by synchronizing application data and GUI widgets.

Introduction

Every once in a while I find myself browsing the Internet trying to find out what’s new and exciting in the Python world. Sometimes I browse to find topics for this article; other times mere curiosity draws me across the web. While I was browsing the other day, I stumbled across AVC: the Application View Controller [1]. I was immediately intrigued by it because its’ name is so similar to the Model View Controller (MVC) pattern. Being familiar with the Model View Controller pattern, and admittedly having struggles with it in the past, I decided to check out AVC to determine if it might be a viable alternative.

After reading about AVC I was intrigued for several reasons. The main reason was the promise of “a multiplatform, fully automatic, live connection among graphical interface widgets and application variables.” [2] This means that graphical widgets can be connected to variables and automatically synchronized. One of the (many?) problems with Graphical User Interface (GUI) programming is that you often find yourself doing the same thing over and over again. One of the things that you end of doing over and over again is setting the contents of a widget based on the value of a variable, and then subsequently, setting that variable’s value based on the current state of the widget. Whenever someone promises me an automatic connection between GUI widgets and my variables, I’m interested.

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