Issue in Flutter Tutorial -ListenableBuilder

[SharkJ]

Steps to reproduce

In the ListenableBuilder tutorial, the final ArticlePage class references nextArticleCallback, which is not defined. The earlier code defines onPressed, so this causes a compile error.

Additionally, wrapping ArticleWidget in Flexible inside SingleChildScrollView results in an unbounded constraints error. Removing Flexible resolves the issue.
(See the attached image.)

Expected results

The tutorial code should compile successfully when copied exactly as shown.

Actual results

Error: The getter 'nextArticleCallback' isn't defined for the type 'ArticlePage'.
RenderFlex children have non-zero flex but incoming height constraints are unbounded.

Code sample

Code sample

class ArticlePage extends StatelessWidget {
  const ArticlePage({
    super.key,
    required this.summary,
    required this.onPressed,
  });

  final Summary summary;
  final VoidCallback onPressed;

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      child: Column(
        children: [
          Flexible(
            child: ArticleWidget(
              summary: summary,
            ),
          ),
          ElevatedButton(
            onPressed: nextArticleCallback,
            child: Text('Next random article'),
          ),
        ],
      ),
    );
  }
}

Screenshots or Video

Screenshots / Video demonstration

Logs

Logs

[Paste your logs here]

Flutter Doctor output

Doctor output

Not applicable.

[saurabh-mirajkar]

@SharkJ Thanks for the report. Please share the exact path of the flutter tutorial to ListenableBuilder concept where we can find the code snippet that you have mentioned in the report.

[SharkJ]

@SharkJ Thanks for the report. Please share the exact path of the flutter tutorial to ListenableBuilder concept where we can find the code snippet that you have mentioned in the report.

Thanks! Here's the link -> https://docs.flutter.dev/learn/pathway/tutorial/listenable-builder

[warioddly]

Hi, closes #13066