Welcome flow sketch and welcome page added.

lib/main.dart

@@ -1,11 +1,14 @@
 import 'package:flutter/material.dart';
+import 'ui/main_page.dart';
+import 'ui/welcome_page.dart';
+import 'ui/credentials_form.dart';
 import 'ui/server_form.dart';
 import 'ui/dialog.dart';
 
 void main() => runApp(MyApp());
 
 class MyApp extends StatelessWidget {
-  final title = 'Welcome page test';
+  final title = 'BotZ';
 
   @override
   Widget build(BuildContext context) {
@@ -15,10 +18,13 @@ class MyApp extends StatelessWidget {
           primarySwatch: Colors.green,
           dialogTheme: baseDialogTheme,
         ),
-        home: Scaffold(
+        initialRoute: "/",
-          appBar: AppBar(title: Text(title)),
+        routes: {
-          body: ServerForm(),
+            "/": (context) => HomePage(nextRoute: "/welcome"),
-        ));
+            "/welcome": (context) => WelcomePage(nextRoute: "/settings/server"),
+            "/settings/server": (context) => ServerForm(defaultNextRoute: "/settings/credentials"),
+            "/settings/credentials": (context) => CredentialsForm(defaultNextRoute: "/"),
+        });
   }
 }
 

lib/ui/main_page.dart

@@ -0,0 +1,147 @@
+import 'package:flutter/material.dart';
+import 'package:logger/logger.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'dart:async';
+
+var log = Logger();
+
+class _DataState {
+  _DataState(
+      {this.userPresent = false,
+      this.passPresent = false,
+      this.zServerPresent = false,
+      this.botZServerPresent = false});
+  bool userPresent;
+  bool passPresent;
+  bool zServerPresent;
+  bool botZServerPresent;
+
+  bool all() {
+    assert(userPresent != null);
+    assert(passPresent != null);
+    assert(zServerPresent != null);
+    assert(botZServerPresent != null);
+    var result =
+        userPresent && passPresent && zServerPresent && botZServerPresent;
+    return result;
+  }
+
+  String toString() {
+    return "\tuser: $userPresent\n\tpass: $passPresent\n\tzServer: $zServerPresent\n\tbotZServer: $botZServerPresent";
+  }
+}
+
+class HomePage extends StatefulWidget {
+  HomePage(
+      {@required this.nextRoute,
+      this.timeout = const Duration(seconds: 1),
+      Key key})
+      : assert(nextRoute != null),
+        super(key: key);
+  final String nextRoute;
+  final Duration timeout;
+
+  HomePageState createState() => HomePageState();
+}
+
+class HomePageState extends State<HomePage> {
+  _DataState status = _DataState();
+  bool _retrieved = false;
+  bool _waitingForWelcome = false;
+  String title = "BotZ";
+
+  Future<void> _retriveStateData() async {
+    var persistence = await SharedPreferences.getInstance();
+    var stateFromPersistence = {
+      "user": (persistence.getString("username") != null) ? true : false,
+      "pass": (persistence.getString("password") != null) ? true : false,
+      "zAddr": (persistence.getString("zAddress") != null) ? true : false,
+      "botZAddr": (persistence.getString("botZAddress") != null) ? true : false,
+    };
+    log.d("State from persistence: ${stateFromPersistence.toString()}");
+    setState(() {
+      status.userPresent = stateFromPersistence["user"];
+      status.passPresent = stateFromPersistence["pass"];
+      status.zServerPresent = stateFromPersistence["zAddr"];
+      status.botZServerPresent = stateFromPersistence["botZAddr"];
+      _retrieved = true;
+    });
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    _retriveStateData();
+  }
+
+  bool _checkData() {
+    log.d("State: ${status.toString()}");
+    if (status.all()) {
+      log.d("Necessary data is present");
+      return true;
+    }
+    log.d("Necessary data is MISSING");
+    return false;
+  }
+
+  void _goToNextPage() {
+    Navigator.pushReplacementNamed(context, widget.nextRoute);
+  }
+
+  Future<void> _cleanState() async {
+    var persistence = await SharedPreferences.getInstance();
+    persistence.setString("username", null);
+    persistence.setString("password", null);
+    persistence.setString("zAddress", null);
+    persistence.setString("botZAddress", null);
+    setState(() {
+      status.userPresent = false;
+      status.passPresent = false;
+      status.zServerPresent = false;
+      status.botZServerPresent = false;
+    });
+  }
+
+  Widget mainView() {
+    return Center(
+        child: Column(
+      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
+      children: <Widget>[
+        RaisedButton(onPressed: _cleanState, child: Text("Clean state")),
+        Column(children: <Widget>[
+          Text("Username: ${status.userPresent}"),
+          Text("Password: ${status.passPresent}"),
+          Text("Z Address: ${status.zServerPresent}"),
+          Text("BotZ Address: ${status.botZServerPresent}"),
+        ])
+      ],
+    ));
+  }
+
+  Widget _body() {
+    log.d("Retrieved: $_retrieved");
+    if (_retrieved) {
+      if (_checkData()) {
+        log.d("Main body");
+        return mainView();
+      } else {
+        if (!_waitingForWelcome) {
+          log.d("Go to ask the user for the data...");
+          Future.delayed(widget.timeout, _goToNextPage);
+          setState(() {
+            _waitingForWelcome = true;
+          });
+        }
+      }
+    }
+    return CircularProgressIndicator();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: Text(title)),
+      body: _body(),
+    );
+  }
+}

lib/ui/welcome_page.dart

@@ -0,0 +1,57 @@
+import 'package:flutter/material.dart';
+import 'package:logger/logger.dart';
+import 'package:flutter/services.dart';
+
+var log = Logger();
+
+class WelcomePage extends StatefulWidget {
+  WelcomePage(
+      {@required this.nextRoute,
+      this.timeout = const Duration(seconds: 5),
+      Key key})
+      : assert(nextRoute != null),
+        super(key: key);
+  final String nextRoute;
+  final Duration timeout;
+
+  WelcomePageState createState() => WelcomePageState();
+}
+
+class WelcomePageState extends State<WelcomePage> {
+  void _goToNext() {
+    Navigator.pushReplacementNamed(context, widget.nextRoute);
+  }
+
+  @override
+  void initState() {
+    log.d("Initing WelcomePage...");
+    super.initState();
+    Future.delayed(widget.timeout, _goToNext);
+  }
+
+  @override
+  Widget build(BuildContext build) {
+    SystemChrome.setEnabledSystemUIOverlays([]);
+    log.d("Building WelcomePage...");
+    return Container(
+        color: Colors.green[300],
+        child: Column(
+            mainAxisAlignment: MainAxisAlignment.spaceBetween,
+            children: <Widget>[
+              Center(
+                  child: Text("Welcome to BotZ",
+                      textAlign: TextAlign.center,
+                      style: TextStyle(
+                          fontWeight: FontWeight.bold,
+                          fontSize: 15.0,
+                          color: Colors.blue[700]))),
+              FlatButton(
+                  color: Colors.green[350],
+                  textColor: Colors.black,
+                  padding: EdgeInsets.all(8.0),
+                  splashColor: Colors.greenAccent,
+                  child: Text("Go"),
+                  onPressed: _goToNext)
+            ]));
+  }
+}