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Flutter Undefined name 'WidgetStateProperty'

I am trying to run this code example https://pub.dev/packages/flutter_adaptive_scaffold/example
but the code does not compile showing Undefined name 'WidgetStateProperty'.

Have tried restarting VS Code and flutter clean/get – not helpful.

Also, tried to copy WidgetStateProperty class into my project, but then I got WidgetState is not a type.

I searched and found this issue https://github.com/hiddify/hiddify-next/issues/946 which seems to be somehow similar but not helpful.

I am on Windows using the latest versions of VS Code, Dart and Flutter

Flutter (Channel stable, 3.22.2, on Microsoft Windows [Version 10.0.19045.4412], locale en-US)

Any ideas?

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2

Answers


  1. Chosen as BEST ANSWER
    0

    I ran Debug - and got a message that errors exist in the project do you like to debug anyway - Yes, then the project is properly built and errors disappear.


  2. 0

    As of version 3.22, MaterialStateProperty is deprecated. We should use WidgetStateProperty instead.

    But if you’re using version 3.19 or lower, you can use MaterialStateProperty instead.

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