fcs/lib/pages/welcome_page.dart

import 'package:flutter/material.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:package_info/package_info.dart';
import 'package:provider/provider.dart';
import 'package:fcs/model/language_model.dart';
import 'package:fcs/widget/banner.dart';
import 'package:fcs/widget/localization/transalation.dart';
import 'package:fcs/widget/offline_redirect.dart';
import 'package:fcs/widget/products.dart';

import 'contact.dart';
import 'login_page.dart';
import 'manual/manual_page.dart';

class WelcomePage extends StatefulWidget {
  @override
  _WelcomePageState createState() => _WelcomePageState();
}

class _WelcomePageState extends State<WelcomePage> {
  String version = "";
  List<bool> _selection = List.generate(2, (_) => false);

  @override
  void initState() {
    super.initState();
    _loadVersion();
    var languageModel = Provider.of<LanguageModel>(context, listen: false);
    languageModel.isEng ? _selection[0] = true : _selection[1] = true;
  }

  _loadVersion() async {
    var version = await getVersionNumber();
    setState(() {
      this.version = version;
    });
  }

  Future<String> getVersionNumber() async {
    PackageInfo packageInfo = await PackageInfo.fromPlatform();
    return "v${packageInfo.version}+${packageInfo.buildNumber}";
  }

  @override
  Widget build(BuildContext context) {
    var languageModel = Provider.of<LanguageModel>(context);

    var toggleButtons = ToggleButtons(
      constraints: BoxConstraints(minWidth: 25.0, minHeight: 25.0),
      children: <Widget>[
        Padding(
          padding: const EdgeInsets.only(right: 8.0),
          child: Container(
            decoration: languageModel.isEng
                ? BoxDecoration(
                    border: Border.all(color: Colors.blueAccent, width: 1))
                : null,
            child: Image.asset(
              "assets/eng_flag.png",
              width: 23,
            ),
          ),
        ),
        Container(
          decoration: !languageModel.isEng
              ? BoxDecoration(
                  border: Border.all(color: Colors.blueAccent, width: 1))
              : null,
          child: Image.asset(
            "assets/myan_flag.png",
            width: 23,
          ),
        ),
      ],
      renderBorder: false,
      isSelected: _selection,
      fillColor: Colors.white,
      onPressed: (int index) {
        languageModel.saveLanguage(Translation().supportedLanguages[index]);
        setState(() {
          for (int buttonIndex = 0;
              buttonIndex < _selection.length;
              buttonIndex++) {
            if (buttonIndex == index) {
              _selection[buttonIndex] = true;
            } else {
              _selection[buttonIndex] = false;
            }
          }
        });
      },
    );

    return OfflineRedirect(
      child: FlavorBanner(
        child: Scaffold(
            backgroundColor: Colors.white,
            appBar: AppBar(
              backgroundColor: Colors.white,
              iconTheme: IconThemeData(
                color: Colors.grey,
              ),
              elevation: 0,
              title: Image(
                  height: 30,
                  fit: BoxFit.scaleDown,
                  image: new AssetImage('assets/img/logo.png')),
              actions: <Widget>[
                IconButton(
                  icon: Image.asset(
                    "assets/manual.png",
                    width: 30,
                    height: 30,
                    color: Colors.black,
                  ),
                  onPressed: () => Navigator.of(context)
                      .push(MaterialPageRoute(builder: (_) => ManualPage())),
                ),
                IconButton(
                  icon: Icon(
                    FontAwesomeIcons.phone,
                    color: Colors.black,
                    size: 20,
                  ),
                  onPressed: () => Navigator.of(context)
                      .push(MaterialPageRoute(builder: (_) => Contact())),
                ),
                IconButton(
                  icon: Icon(
                    FontAwesomeIcons.signInAlt,
                    color: Colors.black,
                    size: 20,
                  ),
                  onPressed: () => Navigator.of(context)
                      .push(MaterialPageRoute(builder: (_) => LoginPage())),
                ),
              ],
            ),
            body: ListView(
              children: <Widget>[
                Row(
                  mainAxisAlignment: MainAxisAlignment.end,
                  children: <Widget>[
                    Padding(
                      padding: const EdgeInsets.only(right: 8.0),
                      child: toggleButtons,
                    ),
                  ],
                ),
                Padding(
                  padding: const EdgeInsets.only(top: 5),
                  child: ProductsWidget(isWelcomePage: false),
                ),
                SizedBox(height: 30,),
                Center(child: Text("${this.version}")),
              ],
            )),
      ),
    );
  }
}