Flutter-Tost

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:leopardseriais/Dialogs/Leopard.Dialogs.dart';
import 'package:leopardseriais/routes/configurationapp/configuration.local.storage.controller.dart';

class FormularioConfiguracaoAPP extends StatefulWidget {
  FormularioConfiguracaoAPP({Key key}) : super(key: key);
  @override
  FormularioConfiguracaoAPPState createState() =>
      FormularioConfiguracaoAPPState();
}

class FormularioConfiguracaoAPPState extends State<FormularioConfiguracaoAPP> {
  final _formKey = GlobalKey<FormState>();
  Storagecontroller storageappcontroller = new Storagecontroller();
  var ipserverin = TextEditingController();
  var portin = TextEditingController();
  var passwordin = TextEditingController();

  BuildContext scaffoldContext;

  @override
  void initState() {
    _getThingsOnStartup().then((value) {
      verificastorage();
    });
    super.initState();
  }

  // Carregamento da view Configurações APP, Delay de 1s
  // O SIstemairá verificar no Storage se existe um Storage criado se não tiver
  // a aplicão irá criar um Storage com valores iniciais.
  Future verificastorage() async {
    return storageappcontroller
        .hasvalue<bool>()
        .catchError((e) => {
              LeopardDialogs(context).show(
                  'Ops!', 'Não existem valores criados no storage', 'Entendi')
            })
        .then((value) => {
              if (!value)
                {
                  storageappcontroller.getPropStorage(
                      doValues: (value) => {
                            ipserverin.text = value.ipservidor,
                            portin.text = value.porta,
                            passwordin.text = value.password
                          })
                }
            });
  }

  @override
  Widget build(BuildContext context) {
    const int FMaxLegth = 40;
    return MaterialApp(
      key: _formKey,
      home: new Scaffold(
        appBar: AppBar(
          title: Text('Configurações do sistema'),
        ),
        body: Padding(
          padding: const EdgeInsets.all(60.0),
          child: Column(
            children: <Widget>[
              TextFormField(
                maxLength: FMaxLegth,
                decoration: InputDecoration(labelText: 'IP do servidor'),
                controller: ipserverin,
                autovalidateMode: AutovalidateMode.onUserInteraction,
                validator: (String arg) {
                  if (arg.isEmpty) {
                    return 'Ip do servidor não pode ser vazio';
                  }
                  return null;
                },
              ),
              Padding(
                padding: const EdgeInsets.only(top: 5.0),
                child: TextFormField(
                    maxLength: FMaxLegth,
                    decoration: InputDecoration(labelText: 'Porta'),
                    keyboardType: TextInputType.number,
                    controller: portin,
                    autovalidateMode: AutovalidateMode.onUserInteraction,
                    validator: (String arg) {
                      if (arg.isEmpty) {
                        return 'Porta não pode ser vazia';
                      }
                      return null;
                    }),
              ),
              Padding(
                padding: const EdgeInsets.only(top: 5.0),
                child: TextFormField(
                  obscureText: true,
                  obscuringCharacter: "*",
                  textAlign: TextAlign.center,
                  controller: passwordin,
                  autovalidateMode: AutovalidateMode.onUserInteraction,
                  validator: (String arg) {
                    if (arg.isEmpty) {
                      return 'Password não pode ser vazio';
                    }
                    return null;
                  },
                  decoration: InputDecoration(
                    labelText: 'Senha',
                    hintText: "Enter password",
                    icon: Icon(Icons.lock),
                  ),
                ),
              ),
              Padding(
                padding: const EdgeInsets.only(top: 5.0),
                child: RaisedButton(
                  child: Text(
                    'Atualizar dados',
                    textAlign: TextAlign.center,
                  ),
                  onPressed: () {
                    storageappcontroller.setPropStorage(ipserverin.text,
                        portin.text, passwordin.text, _formKey.currentContext);
                  },
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  Future _getThingsOnStartup() async {
    await Future.delayed(Duration(seconds: 1));
  }
}