Semana 6 - Parte 4

import 'package:flutter/material.dart';
import 'Models/Produto.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: "Mercado",
      home: Mercado(),
    );
  }
}

class Mercado extends StatefulWidget {
  @override
  _MercadoState createState() => _MercadoState();
}

class _MercadoState extends State<Mercado> {
  final TextEditingController _controladorNome = TextEditingController();
  final TextEditingController _controladorQuantidade = TextEditingController();
  final TextEditingController _controladorValor = TextEditingController();
  final TextEditingController _controladorData = TextEditingController();

  final FocusNode fnNome = FocusNode();
  final FocusNode fnQtd = FocusNode();
  final FocusNode fnValor = FocusNode();

  final List<Produto> produtos = new List();
  bool sort;

  @override
  void initState() {
    sort = false;
    super.initState();
  }

  onSortColumn(int columnIndex, bool ascending) {
    if (columnIndex == 0) {
      if (ascending) {
        produtos.sort((a, b) => a.nome.compareTo(b.nome));
      } else {
        produtos.sort((a, b) => b.nome.compareTo(a.nome));
      }
    }
  }

  void _showToast(BuildContext context, String message) {
    final scaffold = Scaffold.of(context);
    if (message != null) {
      scaffold.showSnackBar(
        SnackBar(
          content: Text(message),
          action: SnackBarAction(
              label: 'FECHAR', onPressed: scaffold.hideCurrentSnackBar),
        ),
      );
    }
  }

  Future<void> _selectDate(context) async {
    DateTime selectedDate = await showDatePicker(
        context: context,
        initialDate: DateTime.now(),
        firstDate: DateTime(2017),
        lastDate: DateTime(2021));
    String resultado =
        "${selectedDate.day}/${selectedDate.month}/${selectedDate.year}";
    _controladorData.text = resultado;
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        home: DefaultTabController(
            length: 2,
            child: Scaffold(
                resizeToAvoidBottomPadding: false,
                appBar: AppBar(
                    title: Text('Produtos'),
                    bottom: TabBar(tabs: [
                      Tab(icon: Icon(Icons.add)),
                      Tab(icon: Icon(Icons.table_chart))
                    ])),
                body: TabBarView(
                  children: [
                    Column(
                      children: <Widget>[
                        Padding(
                            padding: const EdgeInsets.all(16.0),
                            child: TextFormField(
                              controller: _controladorNome,
                              decoration: InputDecoration(labelText: 'Nome'),
                              textInputAction: TextInputAction.next,
                              focusNode: fnNome,
                              onFieldSubmitted: (term) {
                                fnNome.unfocus();
                                FocusScope.of(context).requestFocus(fnQtd);
                              },
                            )),
                        Padding(
                            padding: const EdgeInsets.all(16.0),
                            child: TextFormField(
                                controller: _controladorQuantidade,
                                decoration:
                                    InputDecoration(labelText: 'Quantidade'),
                                keyboardType: TextInputType.number,
                                textInputAction: TextInputAction.next,
                                focusNode: fnQtd,
                                onFieldSubmitted: (term) {
                                  fnQtd.unfocus();
                                  FocusScope.of(context).requestFocus(fnValor);
                                })),
                        Padding(
                            padding: const EdgeInsets.all(16.0),
                            child: TextFormField(
                                controller: _controladorValor,
                                decoration: InputDecoration(labelText: 'Valor'),
                                keyboardType: TextInputType.number,
                                focusNode: fnValor,
                                onFieldSubmitted: (term) {
                                  fnQtd.unfocus();
                                })),
                        Padding(
                          padding: const EdgeInsets.all(16.0),
                          child: Row(
                            children: [
                              Expanded(
                                  child: TextField(
                                controller: _controladorData,
                                enabled: false,
                                decoration: InputDecoration(labelText: 'Data'),
                              )),
                              Expanded(
                                child: RaisedButton(
                                    child: Text('Selecionar Data'),
                                    onPressed: () {
                                      _selectDate(context);
                                    }),
                              )
                            ],
                          ),
                        ),
                        Padding(
                          padding: const EdgeInsets.only(top: 16.0),
                          child: Builder(
                              builder: (context) => RaisedButton(
                                    child: Text('Cadastrar'),
                                    onPressed: () {
                                      final String nome = _controladorNome.text;
                                      final int quantidade = int.tryParse(
                                          _controladorQuantidade.text);
                                      final double valor = double.tryParse(
                                          _controladorValor.text);
                                      final Produto produtoNovo = Produto(
                                          nome,
                                          quantidade,
                                          valor,
                                          _controladorData.text);

                                      produtos.add(produtoNovo);

                                      _controladorNome.text = "";
                                      _controladorQuantidade.text = "";
                                      _controladorValor.text = "";
                                      _controladorData.text = "";

                                      _showToast(context, "Produto adicionado");

                                      setState(() {});
                                    },
                                  )),
                        )
                      ],
                    ),
                    SingleChildScrollView(
                        scrollDirection: Axis.vertical,
                        child: Center(
                          child: Padding(
                            padding: const EdgeInsets.only(top: 30.0),
                            child: DataTable(
                              sortAscending: sort,
                              sortColumnIndex: 0,
                              columns: [
                                DataColumn(
                                    label: Text("Nome",
                                        style: TextStyle(fontSize: 16)),
                                    numeric: false,
                                    onSort: (columnIndex, ascending) {
                                      setState(() {
                                        sort = !sort;
                                      });
                                      onSortColumn(columnIndex, ascending);
                                    }),
                                DataColumn(
                                  label: Text("Qtd",
                                      style: TextStyle(fontSize: 16)),
                                  numeric: true,
                                ),
                                DataColumn(
                                  label: Text("Valor",
                                      style: TextStyle(fontSize: 16)),
                                  numeric: true,
                                ),
                                DataColumn(
                                  label: Text("Data",
                                      style: TextStyle(fontSize: 16)),
                                  numeric: false,
                                ),
                              ],
                              rows: produtos
                                  .map(
                                    (produto) => DataRow(cells: [
                                      DataCell(
                                        Text(produto.nome),
                                      ),
                                      DataCell(
                                        Text(produto.quantidade.toString()),
                                      ),
                                      DataCell(
                                        Text(produto.valor.toString()),
                                      ),
                                      DataCell(
                                        Text(produto.data),
                                      ),
                                    ]),
                                  )
                                  .toList(),
                            ),
                          ),
                        ))
                  ],
                ))));
  }
}