Hi, first of all, thank you very much for your work on this code ! I am really happy to understand how you did this animation.

I think that you could easily make a package that encapsulate this logic in order to let other developers use it without having to copy and paste your class delayed_animation.dart.

Are you planning to do this ? If not, I would be pleased to do it but I prefer to adk you before :)

Thank you again for your work !

Just tried to run your app in vs code on Nexus_6_API_29

Exception has occurred.
FlutterError (ServicesBinding.defaultBinaryMessenger was accessed before the binding was initialized.
If you're running an application and need to access the binary messenger before `runApp()` has been called (for example, during plugin initialization), then you need to explicitly call the `WidgetsFlutterBinding.ensureInitialized()` first.
If you're running a test, you can call the `TestWidgetsFlutterBinding.ensureInitialized()` as the first line in your test's `main()` method to initialize the binding.)

Launching lib\main.dart on Android SDK built for x86 in debug mode...
lib\main.dart:1
[!] Your app isn't using AndroidX.
    To avoid potential build failures, you can quickly migrate your app by following the steps on https://goo.gl/CP92wY .
√ Built build\app\outputs\flutter-apk\app-debug.apk.
Connecting to VM Service at ws://127.0.0.1:64214/4NqcdHwbJ_s=/ws
Error handling 'checkPlatformOverride' custom request: ext.flutter.platformOverride: (-32000) Bad state: The client closed with pending request "ext.flutter.platformOverride".
Error handling 'checkBrightnessOverride' custom request: ext.flutter.brightnessOverride: (-32000) Bad state: The client closed with pending request "ext.flutter.brightnessOverride".