Wrapping stream and working with data.

main.dart

void main() async {
  // This is where you would use a StreamBuilder rather than this use.
  await for (var value in getData()) {
    print(value);
  }
  
  print('Done!');
  /*
   * return StreamBuilder(
   *  stream: getData(),
   *  builder: (contaxt, snapshot) => YourWidget(snapshot.data);
   * );
   * */
}

// This is *your* Stream function.
Stream<List> getData() async* {
  var list = [];

  // Make sure the stream you are wrapping is invokable.
  await for (var data in mockRemoteData()) {
    list.add(Data.fromMap(data));
    yield list;
  }
}

// Ignore the implmentation, just imagine you are recieving data from a network
// and it just timeouts at some point.
Stream<Map> mockRemoteData() async* {
  const sampleData = [
    {'icon': 'delte', 'nome': 'Junior'},
    {'icon': 'add', 'nome': 'Televisao'},
    {'icon': 'bulb', 'nome': 'Batata'}
  ];
  for (int i = 0; i < sampleData.length; i++) {
    await Future.delayed(const Duration(seconds: 1));
    yield sampleData[i];
  }
}

class Data {
  var icon;
  var nome;
  Data(this.icon, this.nome);
  
  factory Data.fromMap(Map<String, dynamic> map)=> Data(map['icon'], map['nome']);
  
  @override
  toString() => 'Data(icon: $icon, nome: $nome)';
}