aman-kassa-flutter/lib/views/home/home_view.dart

import 'package:aman_kassa_flutter/core/locator.dart';
import 'package:aman_kassa_flutter/core/models/Choice.dart';
import 'package:aman_kassa_flutter/core/services/DataService.dart';
import 'package:aman_kassa_flutter/redux/store.dart';
import 'package:aman_kassa_flutter/shared/app_colors.dart';
import 'package:aman_kassa_flutter/widgets/loader/Dialogs.dart';

import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:material_design_icons_flutter/material_design_icons_flutter.dart';

import './tabs/KassaTab.dart';
import './tabs/AdditionalTab.dart';
import './tabs/CalculatorTab.dart';



const List<Choice> choices = const <Choice>[
  const Choice(title: 'Обновить номенклатуру', icon: Icons.update, command: 'update'),
  const Choice(title: 'Помощь', icon: Icons.help, command: 'help'),
  const Choice(title: 'О Программе', icon: Icons.info_outline, command: 'info'),
  const Choice(title: 'Язык', icon: Icons.language, command: 'language'),
  const Choice(title: 'Выйти', icon: Icons.exit_to_app, command: 'exit')
];

class HomeView extends StatefulWidget {
  @override
  _HomeViewState createState() => _HomeViewState();
}

class _HomeViewState extends State<HomeView> {
  PageController pageController;
  int selectedTabIndex;
  DataService _dataService = locator<DataService>();
  final GlobalKey<State> _keyLoader = new GlobalKey<State>();


  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    selectedTabIndex = 0;
    pageController = new PageController(initialPage: selectedTabIndex);
  }

  @override
  void dispose() {
    pageController.dispose();
    super.dispose();
  }

  void _onSelectChoice(Choice choice) async {
    if(choice.command == 'exit') {

    } else if (choice.command == 'update') {
      Dialogs.showLoadingDialog(context, _keyLoader);
      bool result = await _dataService.getDataFromServer(Redux.store.state.userState.user.token);
      print('result: $result');
      Navigator.of(_keyLoader.currentContext,rootNavigator: true).pop();
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Center(
            child: Container(
              width: 100,
              child: Image(
                image: AssetImage('assets/images/logo.png'),
                fit: BoxFit.fitHeight,
              ),
            )),
        actions: <Widget>[
          PopupMenuButton<Choice>(
            icon: Icon(
              Icons.more_vert,
              color: menuColor,
            ),
            onSelected: _onSelectChoice,
            itemBuilder: (BuildContext context) {
              return choices.map((Choice choice) {
                return PopupMenuItem<Choice>(
                  value: choice,
                  child: Row(children: <Widget>[
                    Icon(choice.icon, color: primaryColor,),
                    Text(choice.title)
                  ], ),
                );
              }).toList();
            },
          )
        ],
        backgroundColor: fillColor,
      ),
      body: PageView(
        onPageChanged: (index) {
          setState(() {
            selectedTabIndex = index;
          });
        },
        controller: pageController,
        children: <Widget>[
          KassaTab(0),
          CalculatorTab(1),
          AdditionalTab(2),
        ],
      ),
      bottomNavigationBar: BottomNavigationBar(
        currentIndex: selectedTabIndex,
        backgroundColor: menuColor,
        type: BottomNavigationBarType.shifting,
        items: [
          BottomNavigationBarItem(
              backgroundColor: menuColor,
              icon: Icon(MdiIcons.cashRegister, color: Colors.white),
              title: new Text(
                'Касса',
                style: TextStyle(color: Colors.white),
              )),
          BottomNavigationBarItem(
              icon: Icon(MdiIcons.calculator, color: Colors.white),
              title: new Text(
                'Калькулятор',
                style: TextStyle(color: Colors.white),
              )),
          BottomNavigationBarItem(
              icon: Icon(MdiIcons.tune, color: Colors.white),
              title: new Text(
                'Опции',
                style: TextStyle(color: Colors.white),
              )),
        ],
        onTap: (index) {
          pageController.animateToPage(
            index,
            duration: const Duration(milliseconds: 300),
            curve: Curves.easeIn,
          );
        },
      ),
    );
  }
}