AnimationController and setState | Learn All About Flutter Animations – Part 1: В данной части Flutter Animations будет рассказываться, что такое AnimationController и как его использовать.
http://www.sandromaglione.com/blog/2020/02/17/animationcontroller-and-setstate-learn-all-about-flutter-animations-part-1/
http://www.sandromaglione.com/blog/2020/02/17/animationcontroller-and-setstate-learn-all-about-flutter-animations-part-1/