calculus-provider-calculus-screen.dart

class CalculusScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider<CalculatorState>(
        create: (_) => CalculatorState(),
        builder: (context, _) => CalculusScreenContainer());
  }
}

class CalculusScreenContainer extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        child: SafeArea(
          child: ListView(
            padding: const EdgeInsets.symmetric(horizontal: 24.0),
            children: <Widget>[
              Header(),
              Divider(indent: 10.0, endIndent: 10.0, height: 8.0),
              MemoryInfo(),
              CalculatorInput(),
              MemoryManagement(),
            ],
          ),
        ),
      ),
    );
  }
}