simple flutter state management with setState and dum class that hold logic

main.dart

import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  Mystate createState() => Mystate();
}

class Mystate extends State<MyApp> {
  var counter = Counter();

  var currentCount;

  @override
  initState() {
    currentCount = counter.counter;
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        drawer: Drawer(),
        appBar:
            AppBar(centerTitle: true, title: Text("Simple State Management")),
        body: Column(children: [
          Center(
            child: MyWidget(currentCount),
          ),
          Row(children: [
            FlatButton.icon(
                icon: Icon(Icons.minimize),
                onPressed: () {
                  counter.decrement();

                  setState(() {
                    currentCount = counter.counter;
                  });
                },
                label: Text("decrement")),
            FlatButton.icon(
                icon: Icon(Icons.add),
                onPressed: () {
                  counter.increment();

                  setState(() {
                    currentCount = counter.counter;
                  });
                },
                label: Text("increment"))
          ])
        ]),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  final int numl;
  MyWidget(this.numl);
  @override
  Widget build(BuildContext context) {
    return Text('the current count is: $numl',
        style: TextStyle(color: Colors.red));
  }
}

class Counter {
  var counter = 0;

  void increment() {
    counter++;
  }

  void decrement() {
    counter--;
  }

  int getCurrentCount() {
    return counter;
  }
}

class Observer {
  Map<dynamic, dynamic> repository = {};

  Observer() {
    register(Counter, Counter());
  }

  void register(name, object) {
    repository[name] = object;
  }

  fetch(name) => repository[name];
}

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