[WC] [FLUTTER] [BD] [API] main.dart

import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'controls/databaseClient.dart';
import 'models/dog.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.cyan,
      ),
      home: DogPage(),
    );
  }
}

class DogPage extends StatefulWidget {
  @override
  _DogPageState createState() => _DogPageState();
}

class _DogPageState extends State<DogPage> {
  final GlobalKey<FormState> _formStateKey = GlobalKey<FormState>();

  Future<List<Dog>> dogs;

  int _dogId;
  String _dogName;
  int _dogAge;

  bool isUpdate = false;

  int dogIdForUpdate;

  DatabaseClient db;

  final _dogIdController = TextEditingController();
  final _dogNameController = TextEditingController();
  final _dogAgeController = TextEditingController();

  @override
  void initState() {
    super.initState();
    db = DatabaseClient();
    openDatabase();
  }

  openDatabase() async {
    await db.open();
    refreshDogList();
  }

  refreshDogList() {
    setState(() {
      dogs = db.getDogs();
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('App Dog'),
      ),

      body: Column(
        children: <Widget>[
          Form(
            key: _formStateKey,
            autovalidate: true,
            child: Column(
              children: <Widget>[
                Padding(
                  padding: EdgeInsets.only(left: 10, right: 10, bottom: 10),
                  child: TextFormField(
                    validator: (value) {
                      if (value.isEmpty) {
                        return 'Por favor insira o Id do cachorro';
                      }
                      if (value.trim() == "")
                        return "Somente espaço não é válido!";
                      return null;
                    },
                    onSaved: (value) {
                      _dogId = int.parse(value);
                    },
                    controller: _dogIdController,
                    keyboardType: TextInputType.number,
                    decoration: InputDecoration(
                        focusedBorder: new UnderlineInputBorder(
                            borderSide: new BorderSide(
                                color: Colors.cyan,
                                width: 2,
                                style: BorderStyle.solid)),
                        labelText: "Id do cachorro",
                        icon: Icon(
                          Icons.vpn_key,
                          color: Colors.cyan,
                        ),
                        fillColor: Colors.white,
                        labelStyle: TextStyle(
                          color: Colors.cyan,
                        )),
                  ),
                ),

                Padding(
                  padding: EdgeInsets.only(left: 10, right: 10, bottom: 10),
                  child: TextFormField(
                    validator: (value) {
                      if (value.isEmpty) {
                        return 'Por favor insira o nome do cachorro';
                      }
                      if (value.trim() == "")
                        return "Somente espaço não é válido!";
                      return null;
                    },
                    onSaved: (value) {
                      _dogName = value;
                    },
                    controller: _dogNameController,
                    decoration: InputDecoration(
                        focusedBorder: new UnderlineInputBorder(
                            borderSide: new BorderSide(
                                color: Colors.cyan,
                                width: 2,
                                style: BorderStyle.solid)),
                        labelText: "Nome do cachorro",
                        icon: Icon(
                          Icons.pets,
                          color: Colors.cyan,
                        ),
                        fillColor: Colors.white,
                        labelStyle: TextStyle(
                          color: Colors.cyan,
                        )),
                  ),
                ),

                Padding(
                  padding: EdgeInsets.only(left: 10, right: 10, bottom: 10),
                  child: TextFormField(
                    validator: (value) {
                      if (value.isEmpty) {
                        return 'Por favor insira a idade do cachorro';
                      }
                      if (value.trim() == "")
                        return "Somente espaço não é válido!";
                      return null;
                    },
                    onSaved: (value) {
                      _dogAge = int.parse(value);
                    },
                    controller: _dogAgeController,
                    keyboardType: TextInputType.number,
                    decoration: InputDecoration(
                        focusedBorder: new UnderlineInputBorder(
                            borderSide: new BorderSide(
                                color: Colors.cyan,
                                width: 2,
                                style: BorderStyle.solid)),
                        labelText: "Idade do cachorro",
                        icon: Icon(
                          Icons.calendar_today,
                          color: Colors.cyan,
                        ),
                        fillColor: Colors.white,
                        labelStyle: TextStyle(
                          color: Colors.cyan,
                        )),
                  ),
                ),
              ],
            ),
          ),

          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              RaisedButton(
                color: Colors.cyan,
                child: Text(
                  (isUpdate ? 'ATUALIZAR' : 'ADICIONAR'),
                  style: TextStyle(color: Colors.white),
                ),
                onPressed: () {
                  if (isUpdate) {
                    if (_formStateKey.currentState.validate()) {
                      _formStateKey.currentState.save();
                      db
                          .updateDog(Dog(
                              id: dogIdForUpdate, name: _dogName, age: _dogAge))
                          .then((data) {
                        setState(() {
                          isUpdate = false;
                        });
                      });
                    }
                  }
                  else {
                    if (_formStateKey.currentState.validate()) {
                      _formStateKey.currentState.save();
                      db.insertDog(
                          Dog(id: _dogId, name: _dogName, age: _dogAge));
                    }
                  }
                  _dogIdController.text = '';
                  _dogNameController.text = '';
                  _dogAgeController.text = '';

                  refreshDogList();
                },
              ),
              Padding(
                padding: EdgeInsets.all(10),
              ),
              RaisedButton(
                color: Colors.red,
                child: Text(
                  (isUpdate ? 'CANCELAR ATUALIZAÇÃO' : 'LIMPAR'),
                  style: TextStyle(color: Colors.white),
                ),
                onPressed: () {
                  _dogIdController.text = '';
                  _dogNameController.text = '';
                  _dogAgeController.text = '';

                  setState(() {
                    isUpdate = false;
                    dogIdForUpdate = null;
                  });
                },
              ),
            ],
          ),
          const Divider(
            height: 20.0,
          ),
          Expanded(
            child: FutureBuilder(
              future: dogs,
              builder: (context, snapshot) {
                if (snapshot.data == null || snapshot.data.length == 0) {
                  return Text('Sem dados para exibir');
                }
                else if (snapshot.hasData) {
                  return generateList(snapshot.data);
                }
                return CircularProgressIndicator();
              },
            ),
          ),
        ],
      ),
    );
  }

  SingleChildScrollView generateList(List<Dog> dogs) {
    return SingleChildScrollView(
      scrollDirection: Axis.vertical,
      child: SizedBox(
        width: MediaQuery.of(context).size.width,

        child: DataTable(
          columns: [
            DataColumn(
              label: Text('ID'),
            ),
            DataColumn(
              label: Text('NOME'),
            ),
            DataColumn(
              label: Text('IDADE'),
            ),
            DataColumn(
              label: Text('DELETAR'),
            )
          ],
          rows: dogs
              .map(
                (dog) => DataRow(
                  cells: [
                    DataCell(
                      Text(dog.id.toString()),
                      onTap: () {
                        setState(() {
                          isUpdate = true;
                          dogIdForUpdate = dog.id;
                        });
                        _dogIdController.text = dog.id.toString();
                        _dogNameController.text = dog.name;
                        _dogAgeController.text = dog.age.toString();
                      },
                    ),
                    DataCell(
                      Text(dog.name),
                      onTap: () {
                        setState(() {
                          isUpdate = true;
                          dogIdForUpdate = dog.id;
                        });
                        _dogIdController.text = dog.id.toString();
                        _dogNameController.text = dog.name;
                        _dogAgeController.text = dog.age.toString();
                      },
                    ),
                    DataCell(
                      Text(dog.age.toString()),
                      onTap: () {
                        setState(() {
                          isUpdate = true;
                          dogIdForUpdate = dog.id;
                        });
                        _dogIdController.text = dog.id.toString();
                        _dogNameController.text = dog.name;
                        _dogAgeController.text = dog.age.toString();
                      },
                    ),
                    DataCell(
                      IconButton(
                        icon: Icon(Icons.delete),
                        onPressed: () {
                          db.deleteDog(dog.id);
                          refreshDogList();
                        },
                      ),
                    ),
                  ],
                ),
              )
              .toList(),
        ),
      ),
    );
  }
}