Capitulo 32 ➜ Panel Administración Empresa

Desarrollo de la pantalla y funciones para gestionar información respecto del usuario de tipo empresa, acceso a los métodos CRUD

import 'dart:convert';
import 'package:app/basededatos/DBmanager.dart';
import 'package:app/pantallas/pantallaAdminAgregar.dart';
import 'package:app/pantallas/pantallaAdminEditar.dart';
import 'package:app/pantallas/pantallaRutas.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:app/api/Api.dart';
import 'package:flutter/material.dart';

var basededatos = new DBmanager();

class pantallaAdmin extends StatefulWidget {
  @override
  _pantallaAdminState createState() => _pantallaAdminState();
}

class _pantallaAdminState extends State<pantallaAdmin> {
  var user_id = 0;
  void _verificarUsuario() async {
    SharedPreferences preferencia = await SharedPreferences.getInstance();
    var user = json.decode(preferencia.getString("user"));
    if (user) {
      setState(() {
        user_id = user['id'];
      });
    } else {
      Navigator.of(context).pushReplacement(
          MaterialPageRoute(builder: (BuildContext) => pantallaRutas()));
    }
  }

  @override
  void initState() {
    // TODO: implement initState
    _verificarUsuario();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Administración"),
        actions: [
          IconButton(
              icon: Icon(Icons.input),
              onPressed: () {
                _logout();
              })
        ],
      ),
      body: Container(
        child: user_id != 0
            ? FutureBuilder(
                future: basededatos
                    .obtenerEmpresas(" user_id=" + user_id.toString()),
                builder: (c, s) {
                  if ((s.hasData) && (s.data.length > 0)) {
                    return ListView.builder(
                        itemCount: s.data != null ? 0 : s.data.length,
                        itemBuilder: (_c, _i) {
                          return Row(
                            children: [
                              Text(s.data[_i].razonsocial),
                              RaisedButton(
                                onPressed: () {
                                  Navigator.of(context).push(MaterialPageRoute(
                                      builder: (BuildContext) =>
                                          pantallaAdminEditar()));
                                },
                                child: Text("EDITAR"),
                              ),
                              RaisedButton(
                                onPressed: () {},
                                child: Text("ELIMINAR"),
                              )
                            ],
                          );
                        });
                  } else {
                    return Center(child: Text("No tienes empresa"));
                  }
                })
            : Center(child: Text("No tienes empresas")),
      ),
      floatingActionButton: FloatingActionButton.extended(
          onPressed: () {
            Navigator.of(context).push(MaterialPageRoute(
                builder: (BuildContext) => pantallaAdminAgregar()));
          },
          label: Text("AGREGAR")),
    );
  }

  void _logout() async {
    var respuesta = await Api().logout("logout");
    var contenido = json.decode(respuesta.body);
    if (contenido['success']) {
      SharedPreferences logout = await SharedPreferences.getInstance();
      logout.remove("token");
      logout.remove("user");
      print("logout");
      //
      Navigator.of(context).pushReplacement(
          MaterialPageRoute(builder: (BuildContext) => pantallaRutas()));
    } else {
      print(contenido['mensaje']);
    }
  }
}