lista-categorias.dart

import 'package:PhotoReport/blocs/categoria_bloc.dart';
import 'package:PhotoReport/helpers/categoria_helper.dart';
import 'package:PhotoReport/helpers/obra_helper.dart';
import 'package:PhotoReport/widgets/CustomShowDialog.dart';
import 'package:flutter/material.dart';

import 'add_categoria.dart';

class ListaCategoriasPage extends StatefulWidget {
  final Obra obra;

  ListaCategoriasPage(this.obra);

  @override
  _ListaCategoriasPageState createState() => _ListaCategoriasPageState();
}

class _ListaCategoriasPageState extends State<ListaCategoriasPage> {
  Obra obra;
  CategoriaBloc _bloc;

  @override
  void initState() {
    super.initState();

    obra = widget.obra;
    _bloc = CategoriaBloc(buildingId: obra.id);

    _bloc.outState.listen((state) {
      switch (state) {
        case CategoriaState.LOADING:
          _buildLoadingWidget();
          break;
        case CategoriaState.SUCCESS:
        case CategoriaState.IDLE:
        case CategoriaState.FAIL:
        default:
          _buildingBody();
          break;
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Categorias"),
      ),
      body: StreamBuilder<CategoriaState>(
        stream: _bloc.outState,
        builder: (context, snapshot) {
          switch (snapshot.data) {
            case CategoriaState.LOADING:
              return _buildLoadingWidget();
              break;
            default:
              return _buildingBody();
              break;
          }
        },
      ),
      floatingActionButton: FloatingActionButton(
        heroTag: "ListaCategorias",
        onPressed: () async {
          var resultado = await Navigator.of(context).push(MaterialPageRoute(
              builder: (BuildContext context) => AddCategoriaPage(
                    "add",
                    obra: obra,
                  ),
              fullscreenDialog: true));

          if (resultado != null) {
            setState(() {
              _bloc.obterCategorias(obra.id);
            });
          }
        },
        child: Icon(Icons.add),
      ),
    );
  }

  Widget _buildingBody() {
    return ListView.builder(
      itemCount: _bloc.categorias.length,
      itemBuilder: (context, index) {
        return _bloc.categorias.length > 0
            ? _buildCategoriaWidget(index)
            : Container();
      },
    );
  }

  Widget _buildLoadingWidget() {
    return Center(
        child: Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        CircularProgressIndicator(),
        SizedBox(
          height: 10.0,
        ),
        Text("Carregando...")
      ],
    ));
  }

  Widget _buildErrorWidget(String error) {
    return Center(
        child: Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Text("Ocorreu um erro: $error"),
      ],
    ));
  }

  Widget _buildCategoriaWidget(int index) {
    return GestureDetector(
      child: Card(
        color: Theme.of(context).cardColor,
        child: Padding(
          padding: EdgeInsets.all(10.0),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: <Widget>[
              Text(_bloc.categorias[index].nome,
                  style: Theme.of(context)
                      .textTheme
                      .title
                      .copyWith(color: Colors.black)),
              Text(
                  _bloc.categorias[index].qtdImagens > 1
                      ? "${_bloc.categorias[index].qtdImagens} imagens"
                      : "${_bloc.categorias[index].qtdImagens} imagem",
                  style: Theme.of(context)
                      .textTheme
                      .subtitle
                      .copyWith(color: Colors.black))
            ],
          ),
        ),
      ),
      onTap: () {
        setState(() {
          _settingModalBottomSheet(context, _bloc.categorias[index]);
        });
      },
    );
  }

  void _settingModalBottomSheet(BuildContext context, Categoria categoria) {
    showModalBottomSheet(
        context: context,
        builder: (BuildContext bc) {
          return Container(
            child: new Wrap(
              children: <Widget>[
                new ListTile(
                    leading: new Icon(Icons.edit),
                    title: new Text('Editar'),
                    onTap: () async {
                      setState(() async {
                        await Navigator.of(context).push(MaterialPageRoute(
                            builder: (context) => AddCategoriaPage("edit",
                                obra: obra, categoria: categoria)));
                        Navigator.of(context).pop();
                        setState(() {
                          _bloc.getCategorias(obra.id);
                        });
                      });
                    }),
                new ListTile(
                  leading: new Icon(Icons.delete),
                  title: new Text('Deletar'),
                  onTap: () {
                    Navigator.of(context).pop();

                    showDialog(
                        context: context,
                        barrierDismissible: false,
                        builder: (BuildContext context) {
                          return WillPopScope(
                            onWillPop: () => Future(() => false),
                            child: CustomAlertDialog(
                              title: Text("Atenção!"),
                              content: Text(
                                  "Deseja excluir a categoria selecionada?"),
                              actions: <Widget>[
                                FlatButton(
                                  child: Text("Sim"),
                                  onPressed: () {
                                    setState(() async {
                                      Navigator.of(context).pop();
                                      setState(() {
                                        _bloc.deletar(categoria);
                                      });
                                      //await categoriaBloc.getCategorias(obra.id);
                                    });
                                  },
                                ),
                                FlatButton(
                                  child: Text("Não"),
                                  onPressed: () {
                                    Navigator.of(context).pop();
                                  },
                                ),
                              ],
                            ),
                          );
                        });
                  },
                ),
              ],
            ),
          );
        });
  }
}