lokinet-flutter-app/lib/main.dart

import 'package:flutter/material.dart';
import 'package:lokinet_lib/lokinet_lib.dart';
import 'package:lokinet_mobile/src/widget/lokinet_divider.dart';
import 'package:lokinet_mobile/src/widget/themed_lokinet_logo.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Lokinet App',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.teal,
        // This makes the visual density adapt to the platform that you run
        // the app on. For desktop platforms, the controls will be smaller and
        // closer together (more dense) than on mobile platforms.
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Lokinet'),
    );
  }
}

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

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

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

class MyHomePageState extends State<MyHomePage> {
  Widget build(BuildContext context) {
    final key = new GlobalKey<ScaffoldState>();
    return Scaffold(
      key: key,
        body: Column(children: [
          ThemedLokinetLogo(),
          LokinetDivider(),
          MyForm()
        ])
    );
  }
}

// Create a Form widget.
class MyForm extends StatefulWidget {
  @override
  MyFormState createState() {
    return MyFormState();
  }
}

class MyFormState extends State<MyForm> {
  @override
  Widget build(BuildContext context) {
    final key = new GlobalKey<FormState>();
    final textInput = TextEditingController();

    var brightness = MediaQuery.of(context).platformBrightness;
    bool darkModeOn = brightness == Brightness.dark;

    return Form(
      key: key,

        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[

            IconButton(
                iconSize: 160,
                onPressed: () async {
                  if(!key.currentState.validate()) {
                    return;
                  }
                  if (await LokinetLib.isRunning) {
                    await LokinetLib.disconnectFromLokinet();
                  } else {
                    String exitNode = textInput.value.text.trim();
                    if(exitNode == "") exitNode = "exit.loki";
                    final result = await LokinetLib.prepareConnection();
                    if (result) LokinetLib.connectToLokinet(exitNode: exitNode);
                  }
                },
                icon: Icon(Icons.power_settings_new_outlined)),
            TextFormField(
                validator: (value) {
                  final trimmed = value.trim();
                  if(trimmed == "") return null;
                  if(trimmed == ".loki" || !trimmed.endsWith(".loki"))
                    return "Invalid exit node value";
                  return null;
                },
                controller: textInput,
                decoration: InputDecoration(
                border: UnderlineInputBorder(),
                labelText: 'Exit Node'
              )
            ),
            TextButton(
              child: Padding(
                  padding: EdgeInsets.all(10),
                  child: Text('Is this thing on?')),
              onPressed: () async {
                if (await LokinetLib.isRunning) {
                  ScaffoldMessenger.of(context)
                      .showSnackBar(SnackBar(content: Text('Yes!')));
                } else {
                  ScaffoldMessenger.of(context)
                      .showSnackBar(SnackBar(content: Text('No!')));
                }
              }
            )
          ]
        )
      );
  }
}