Xamarin Forms Tiny Calculator

Simple Calculator written using Xamarin Forms (no XAML) in +-90 lines of code.

This project inspired by a tweet by Don Syme who managed to create a F# based calculator using Elmish, which runs on top of Xamarin Forms. His solution weighed in at 95 lines of code.

Thomas Burkart also accepted the challenge for a Flutter equivalent, and his solution weighed in at +-90 lines of code.

This app will run on 7 platforms:

Platform clients:

• Android
• iOS
• Mac
• UWP (Windows Universal Platform, including XBOX)
• WPF (Classic Windows Desktop)
• GTK (for Linux, Mac and Windows)
• WASM (Web Assembly) - Demo Link here: https://rogerwcpt.github.io/calculator

Code in action on Visual Studio for Mac

Screenshots for each platform

Android

iOS

Mac OS X

Windows UWP

Windows WPF

Linux

Web Assembly (browser)

Notes:

• UI ported from https://github.com/xamarin/mobile-samples/tree/master/LivePlayer/BasicCalculator
• All classes have been crammed into Main.cs to more easily count the lines of code.
• The MVVM Branch has the ViewModel/View implementation, complete with bindings.
• Braces add more lines of code, so I've used trailing braces for more compact code).
• With the Exception of the WASM project, no third party libraries used, just what is available in Xamarin. WASM uses Ooui
• To run the WASM project, build it, then open a terminal at to FormsTinyCalculator.Wasm/bin/Debug/netcoreapp2.1/dist and run python server.py to start a lightweight python web server in this folder. and then open your browser at http://localhost:8000/ . If you have Firefox, you can simply open the index.html file from the same folder without having to start the python web server.