hello, why it not work? i'm imitated it from example/thememode,

[red-co]

this is code,
i just want declarate state it in parents, update or use it in child or Siblings,

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

void main() {
  runApp(const MainApp());
}

class MainApp extends StatelessWidget {
  const MainApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
        debugShowCheckedModeBanner: false, home: SolidProvidersPage());
  }
}

class NumberProvider {
  NumberProvider(this.number);
  int number;
}

class SolidProvidersPage extends StatelessWidget {
  const SolidProvidersPage({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('SolidProviders'),
      ),
      body: Solid(
        providers: [
          SolidSignal<Signal<NumberProvider>>(
            create: () => createSignal(NumberProvider(1)),
            // Do not create the provider lazily, but immediately
            id: 1,
          ),
        ],
        builder: (context) {
          var data = context.observe<NumberProvider>(1);
          return Center(
            child: Column(
              children: [
                Text(
                  "${data.number}",
                  style: TextStyle(fontSize: 42),
                ),
                SomeChild(),
              ],
            ),
          );
        },
      ),
    );
  }
}

class SomeChild extends StatelessWidget {
  const SomeChild({super.key});
  @override
  Widget build(BuildContext context) {
    final numberProvider = context.get<Signal<NumberProvider>>(1);
    return SignalBuilder(
        signal: numberProvider,
        builder: (_, numberProvider, __) {
          print('number: ${numberProvider.number}');
          return ElevatedButton(
              onPressed: () {
                numberProvider.number++;
                print('number: ${numberProvider.number}');
              },
              child: Text('number: ${numberProvider.number}'));
        });
  }
}

[nank1ro]

It's because you're mutating the number field of the class directly and not the signal.
If you change the onPressed to this it will work:

 numberProvider.update((value) => NumberProvider(value.number + 1));

In addition rename numberProvider here builder: (_, numberProvider, __) { into something else because this is the value, not the signal.

[red-co]

Thank you,