checker/lib/screens/settings.dart

import 'dart:async';

import 'package:checker/base/base_screen.dart';
import 'package:checker/base/base_state.dart';
import 'package:checker/common.dart';
import 'package:checker/consts.dart';
import 'package:checker/db.dart';
import 'package:checker/network.dart';
import 'package:checker/screens/currencies.dart';
import 'package:checker/screens/languages.dart';
import 'package:checker/screens/splash.dart';
import 'package:checker/strings.dart';
import 'package:flutter/material.dart';

class SettingsScreen extends BaseScreen {

  final bool returnToScanner;

  SettingsScreen(helper, app, this.returnToScanner) : super(helper, app);

  @override State createState() =>
    new SettingsState(helper, app, returnToScanner);
}

class MenuItem {

  // Заголовок пункта меню и выбранное значение.
  String title, selectedValue;

  MenuItem(this.title, this.selectedValue);
}

class SettingsState extends BaseState<SettingsScreen> {

  List<MenuItem> menuItems = [
    new MenuItem('', ''),
    new MenuItem('', ''),
    new MenuItem('', '')
  ];

  bool returnToScanner;
  String versionName = "";

  bool isAutomaticallyImplyLeading() => true;

  SettingsState(SqliteHelper helper, String app, bool returnToScanner) : super(helper, app) {
    this.returnToScanner = returnToScanner;
  }

  @override Widget build(BuildContext ctx) {
    if (this.versionName == "") {
      platform.invokeMethod('getVersionName').then((versionName) {
        setState(() {
          this.versionName = versionName;
        });
      });
    }
    // TODO: Перенести в initStater
    helper.getSettings(true).then((info) {
      setState(() {
        menuItems[0].title = StringsLocalization.currency();
        menuItems[1].title = StringsLocalization.locale();
        menuItems[2].title = StringsLocalization.logout();
        menuItems[0].selectedValue = info['currency'].toString();
        menuItems[1].selectedValue =
        info['locale'] == null ? StringsLocalization.localeCode : info['locale'];
        menuItems[2].selectedValue =
        info['token'] == null ? '' : getTokenSuffix(info['token']);
      });
    });
    return getMainWidget();
  }

  String getTokenSuffix(String token) {
    return token.substring(token.length - 4, token.length);
  }

  Widget getMainWidget() {
    return new Scaffold(appBar: getAppBar(),
      body: getScreenContent());
  }

  @override
  Widget getScreenContent() {
    return new Container(
      margin: new EdgeInsets.only(top: 16.0),
      child: new ListView(children: getSettings()));
  }

  @override
  List<Widget> getMenuButtons() {
    return null;
  }

  List<Widget> getSettings() {
    List<Widget> widgets = new List();
    for (int i = 0; i < menuItems.length; i++) {
      if (menuItems[i].selectedValue.toString() != '') {
        widgets.add(
          getSettingsItem(() => onPressed(menuItems.indexOf(menuItems[i])),
            menuItems[i].title,
            getValue(i)));
      }
    }
    return widgets;
  }

  String getValue(int position) {
    switch (position) {
      case 0 :
        return getCurrencyTitle(int.parse(menuItems[position].selectedValue));
      case 1 :
        return getLocaleTitle(menuItems[position].selectedValue);
      default :
        return null;
    }
  }

  Widget getSettingsItem(VoidCallback onPressed, String title, String value) {
    return new Container(
      height: 56.0,
      padding: new EdgeInsets.only(left: 8.0),
      child: (new FlatButton(
        onPressed: onPressed,
        child: getRow(title, value))));
  }

  Widget getRow(String title, String value) {
    if (value == null) {
      return new Row(children: <Widget>[
        new Text(title, style: new TextStyle(
          fontWeight: FontWeight.w600,
          color: faqGrey,
          fontSize: 14.0))
      ]);
    } else {
      return new Row(children: <Widget>[
        new Expanded(child: new Text(title, style: new TextStyle(
          fontWeight: FontWeight.w600,
          color: faqGrey,
          fontSize: 14.0))),
        new Text(value,
          style: new TextStyle(
            fontWeight: FontWeight.w400,
            color: faqGrey,
            fontSize: 14.0)),
        getArrow()
      ]);
    }
  }

  void onPressed(int position) {
    switch (position) {
      case 0 :
        return pushRoute(context, new CurrenciesScreen(helper, app));
      case 1 :
        return pushRoute(context, new LanguagesScreen(helper, app));
      case 2 :
        return logout(context, helper);
    }
  }

  // В методе отправляется запрос на удаление токена кассы, очищаются SharedPreferences приложения.
  logout(BuildContext context, SqliteHelper helper) {
    showYesNoDialog(context, StringsLocalization.confirmation(),
      StringsLocalization.askChangeStore());
  }

// Запуск диалога с двумя кнопками
  showYesNoDialog(BuildContext context, String title, String content) {
    showDialog<bool>(
      context: context,
      child: new AlertDialog(
        title: new Text(title),
        content: new Text(content),
        actions: <Widget>[
          new FlatButton(
            child: new Text(StringsLocalization.no()),
            onPressed: () {
              Navigator.of(context).pop(false);
            }),
          new FlatButton(
            child: new Text(StringsLocalization.yes()),
            onPressed: () {
            Navigator.of(context).pop(true);
            })
        ])).then((b) {
      if (b) {
        helper.getToken().then((token) {
          getDeleteTokenRequest(token).then((response) {
            helper.clear().then((result) {
              Navigator.of(context).pop('');
            });
          }).catchError((error) {
            print(error.toString());
            Navigator.of(context).pop('');
          });
        });
      }
    });
  }

  Widget getArrow() {
    return new Container(margin: new EdgeInsets.only(left: 8.0),
      child: new Image.asset(settings_arrow_png, height: 42.0));
  }

  @override
  String getTitle() {
    return StringsLocalization.settings() + " ($versionName)";
  }
}