Handle deeply nested objects

[rrousselGit]

The devtool seems to not support "expanding" deeply nested objects

Diagnosticable objects with diagnosticable members, or lists of diagnosticable objects may print in not show the full information.

To be more specific, it seems like the devtool only a fixed depth and then fallback to showing toString instead of having the "expandable" feature.

Would it be possible to remove this toString fallback and support deeply nested objects?

[jacob314]

Can you provide a repro? There is not a fallback to toString but it sounds like something is going wrong with how some objects are deserialized.

[rrousselGit]

Sure:

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class A with DiagnosticableTreeMixin {
  A(this.a, this.b);
  final String a;
  final B b;

  @override
  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
    super.debugFillProperties(properties);
    properties.add(StringProperty('a', a));
    properties.add(DiagnosticsProperty<B>('b', b));
  }
}

class B with DiagnosticableTreeMixin {
  B(this.b);

  final String b;
  @override
  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
    super.debugFillProperties(properties);
    properties.add(StringProperty('b', b));
  }
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return SizedBox.expand();
  }

  @override
  void debugFillProperties(DiagnosticPropertiesBuilder properties) {
    super.debugFillProperties(properties);

    properties.add(DiagnosticsProperty('a', A('a', B('b'))));
    properties.add(DiagnosticsProperty('b', B('b')));
  }
}

In this screenshot, we can see that B cannot be expanded if it is a descendant of A.
But if we use it independently from A, then B can correctly be expanded.

[rrousselGit]

Anything I can do to help this progress?

[kenzieschmoll]

@jacob314 any updates on this?