Flutter 3: How to extend ThemeData

In 2019, I have written an article about extending the flutter ThemeData class by using Extension methods. In my opinion, that was just a workaround; it has some drawbacks and it’s not very elegant. With the release of Flutter 3.0, it comes with a better solution: the ThemeExtension class.

The New Solution

We are going to make the bootstrap flavoured colour scheme, just like the last time: