import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

import '../../components/commonFun.dart';
import '../../services/Storage.dart';
import 'FaceLogin.dart';
import 'LoginByName2.dart';

// class LoginTabs extends StatelessWidget {
//   // This widget is the root of your application.
//   @override
//   Widget build(BuildContext context) {
//     //Flutter 强制竖屏
//     SystemChrome.setPreferredOrientations([
//       DeviceOrientation.portraitUp, //只能纵向
//       DeviceOrientation.portraitDown, //只能纵向
//     ]);
//
//     return MaterialApp(
//       debugShowCheckedModeBanner: false,
//       title: 'Flutter Demo',
//       theme: ThemeData(
//         primarySwatch: Colors.blue,
//         visualDensity: VisualDensity.adaptivePlatformDensity,
//       ),
//       home: MyHomePage(title: 'Flutter Demo Home Page'),
//     );
//   }
// }

class LoginTabs extends StatefulWidget {
  LoginTabs({Key key, this.title}) : super(key: key);
  final String title;

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

class _MyHomePageState extends State<LoginTabs> {
  @override
  void initState() {
    super.initState();

    //若下面文件不存在，
    // /data/data/com.flutter.hyzp_ybqx/shared_prefs/FlutterSharedPreferences.xml
    // value为null， 会抛出异常：
    // [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: Invalid argument(s): The source must not be null
    // int.parse (dart:core-patch/integers_patch.dart:51:25)
    Storage.getString("tabs_index").then((value) {
      g_iIndex = (null == value) ? 0 : int.parse(value);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Container(
      decoration: BoxDecoration(
        image: DecorationImage(
          image: AssetImage("assets/images/背景图.png"),
          fit: BoxFit.cover,
        ),
      ),
      child: Container(
        width: double.infinity,
        height: 400,
        child: Container(
          constraints: BoxConstraints(
              minWidth: double.infinity, //最小宽度尽量取最大
              maxHeight: 400 //最小高度为80
              ),
          child: DefaultTabController(
            length: 2,
            child: Scaffold(
              //backgroundColor: Colors.transparent,
              appBar: AppBar(
                //backgroundColor: Colors.transparent,
                title: Text("宜宾市翠屏黑烟车电子抓拍系统"),
                leading: IconButton(
                  icon: Icon(Icons.close),
                  onPressed: () {
                    SystemNavigator.pop();
                  },
                ),
                centerTitle: true,
                bottom: TabBar(
                  labelColor: Colors.blueAccent,
                  unselectedLabelColor: Colors.black26,
                  tabs: <Widget>[Tab(text: "密码登录"), Tab(text: "刷脸登录")],
                ),
              ),
              body: TabBarView(
                //flutter tabbar禁止手势滑动-OK
                physics: new NeverScrollableScrollPhysics(),
                children: <Widget>[
                  LoginByName2(),
                  FaceLogin(),
                ],
              ),
            ),
          ),
        ),
      ),
    );
  }
}