import 'dart:async';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

void main() async {
  final _mediaStreamController = StreamController<int>.broadcast();
  runApp(
    MultiProvider(
      providers: [
        Provider<StreamController<int>>.value(value: _mediaStreamController),
        StreamProvider<int>.value(
          value: _mediaStreamController.stream,
          updateShouldNotify: (p1, p2) {
            return true;
          },
        )
      ],
      child: MyHomePage(),
    ),
  );
}

class MyHomePage extends StatelessWidget {
  MyHomePage({Key key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    final _controller =
        Provider.of<StreamController<int>>(context, listen: false);
    int timesInsideOdds = 0;
    int timesInsideEven = 0;
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Stream Bug'),
        ),
        body: Center(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              Selector<int, int>(
                selector: (BuildContext context, int progress) => progress,
                shouldRebuild: (prev, next) => next % 2 == 0,
                builder: (context, progress, _) => Text(
                    "Numbers Even from 1 to 100: ${++timesInsideEven} Last Received: $progress"),
              ),
              Selector<int, int>(
                selector: (BuildContext context, int progress) => progress,
                shouldRebuild: (prev, next) => next % 2 == 1,
                builder: (context, progress, _) => Text(
                    "Numbers Odd from 1 to 100: ${++timesInsideOdds} Last Received: $progress"),
              )
            ],
          ),
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: () async {
            for (var i in List<int>.generate(100, (i) => i + 1)) {
              await Future.delayed(Duration(milliseconds: 5));
              _controller.add(i);
            }
          },
        ),
      ),
    );
  }
}