OpenMediacenterMobileFlutter/lib/login/logincontext.dart

import 'package:flutter/material.dart';

import '../api/token.dart';
import '../log/log.dart';

class LoginContainer extends StatefulWidget {
  const LoginContainer({Key? key, required this.child}) : super(key: key);
  final Widget child;

  @override
  _LoginContainerState createState() => _LoginContainerState();
}

class _LoginContainerState extends State<LoginContainer> {
  bool loggedIn = false;
  bool loading = true;

  @override
  void initState() {
    // TODO: implement initState
    super.initState();

    final token = Token.getInstance();
    token.getToken().then((value) {
      // todo this context call might occur before app rendered correctly!
      Log.i("The token value is $value");
      if (value != "") {
        setState(() {
          loggedIn = true;
          loading = false;
        });
      } else {
        setState(() {
          loggedIn = false;
          loading = false;
        });
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return LoginContext(
      LoggedIn: loggedIn,
      child: loading
          ? MaterialApp(
              home: Container(
                color: Colors.white,
                child: const Center(child: CircularProgressIndicator()),
              ),
            )
          : widget.child,
      onLoggin: (bool login) {
        if (loggedIn != login) {
          setState(() {
            loggedIn = login;
          });
        }
      },
    );
  }
}

class LoginContext extends InheritedWidget {
  const LoginContext(
      {Key? key,
      required Widget child,
      required this.LoggedIn,
      required this.onLoggin})
      : super(key: key, child: child);

  final bool LoggedIn;
  final void Function(bool) onLoggin;

  static LoginContext of(BuildContext context) {
    final LoginContext? result =
        context.dependOnInheritedWidgetOfExactType<LoginContext>();
    assert(result != null, 'No LoginContext found in context');
    return result!;
  }

  @override
  bool updateShouldNotify(LoginContext old) {
    return LoggedIn != old.LoggedIn;
  }
}