MVC approach in Flutter

I am starting to get into flutter development and wanted to implement an app using the MVC strategy.
In my case I wanted to use the MVC pattern especially to handle the http requests to the backend better.
My problem is, that I don't know if my following approach is correct:
GitHub Project
In the Project there is also an image of a plantuml diagram.

Especially that the Controller 'controls' the State Class is my worry.