GUI Showdown

Andy’s GUI Showdown - The same application, implemented in various ways - which is better, cleaner, more understandable etc?

Like the TodoMVC “Rosetta Stone” project, but uses a different example application, and includes Python as well as Javascript implementations.

This project was originally intended to see if an ECS (Entity Component System), which is commonly used in building games, could be used to implement a “normal” GUI application.

Five Javascript implementations:

Live Demo of all Javascript implementations.

Technique Lines Comment
OO 279 Gui wired via OO (Object Oriented Models with Observer)
MVCA 383 Gui wired via MVCA Architectural Pattern 🆕!!
ECS 228 Gui wired via ECS (Entity Component System)
PLAIN 154 Gui wired via plain JQuery
VUE 58 Gui wired via Vue.js

Two wxPython implementations:

Technique Lines Comment
ECS 344 Gui wired via ECS (Entity Component System)
OO 290 Gui wired via OO (Object Oriented Models with Observer)

Counting the number of lines is approximate. Implementation code that is a convenient extension to a library or framework is not counted. E.g. Vue.js itself is not counted, obviously. ECS uses Jecs library, which is not counted, nor are some extension functions I added. OO technique uses an observer design pattern, whose short implementation code is not counted - its the least I could do to help the OO approach which came in at a whopping 300 lines.

There is an index.html launch page to get to all these implementations, as well as a debug view showing models in real time as you work with the GUI.

The Application being implemented

The UI


Whilst not that complex, this application has a few interesting nuances which challenge any implementation. The main nuance is that whilst the “model” can be edited and manipulated (made uppercase, set to certain phrases) the top header area displays the model according to various “display options”. Changing the display options changes how to top area appears but does not change the model.

Specifically, the behaviour we are implementing is:


  • a welcome message, default “Welcome”
  • a user, with a firstname and surname, default “Sam Smith”
model = {"welcome_msg": "Welcome", "user": {"firstname": "Sam", "surname": "Smith"}}

The GUI displays:

  • the welcome message twice
    • top left: pure message
    • top right: message + user
  • text entry, which allows editing of the welcome message
  • text entry, which allows editing of the user name and surname
  • checkbox1, which toggles the model welcome message uppercase/lowercase
  • checkbox2, which toggles the top right user to uppercase (not via model)
  • button1, which resets the welcome message to “Hi”
  • button2, which resets the user to “Fred Flinstone”


More commentary and evaluation of the techniques to come.