streamcontroller-sink-in-flutter.dart

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

void main() {
  runApp(
    const App(),
  );
}

class App extends StatelessWidget {
  const App({
    Key? key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      debugShowCheckedModeBanner: false,
      home: const HomePage(),
    );
  }
}

class HomePage extends HookWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final controller = useStreamController<String>();
    return Scaffold(
      appBar: AppBar(
        title: StreamBuilder<String>(
          stream: controller.stream,
          initialData: 'Waiting',
          builder: (_, snapshot) => Text(
            snapshot.requireData,
          ),
        ),
      ),
      body: Padding(
        padding: const EdgeInsets.all(8.0),
        child: TextField(
          decoration: const InputDecoration(
            hintText: 'Please enter some text here...',
          ),
          onChanged: controller.sink.add,
        ),
      ),
    );
  }
}