OnBoarding: Add a dots indicator at the bottom

This way we clearly know that we can go back in the onboarding process.
I hope. It definitely looks much better now.

lib/screens/onboarding_screens.dart

@@ -5,6 +5,7 @@ import 'package:flutter/services.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 import 'package:path/path.dart' as p;
+import 'package:dots_indicator/dots_indicator.dart';
 
 import 'package:journal/analytics.dart';
 import 'package:journal/state_container.dart';
@@ -36,6 +37,8 @@ class OnBoardingScreenState extends State<OnBoardingScreen> {
   String gitCloneErrorMessage = "";
 
   var pageController = PageController();
+  int _currentPageIndex = 0;
+
   final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
 
   String publicKey = "";
@@ -173,6 +176,10 @@ class OnBoardingScreenState extends State<OnBoardingScreen> {
             'page_name': pageName,
           },
         );
+
+        setState(() {
+          _currentPageIndex = pageNum;
+        });
       },
     );
 
@@ -181,8 +188,17 @@ class OnBoardingScreenState extends State<OnBoardingScreen> {
       body: new Container(
         width: double.infinity,
         height: double.infinity,
-        //color: Theme.of(context).primaryColor,
-        child: pageView,
+        child: Stack(
+          alignment: FractionalOffset.bottomCenter,
+          children: <Widget>[
+            pageView,
+            new DotsIndicator(
+              numberOfDot: pageCount,
+              position: _currentPageIndex,
+              dotActiveColor: Theme.of(context).primaryColorDark,
+            )
+          ],
+        ),
         padding: EdgeInsets.all(16.0),
       ),
     );

pubspec.lock

@@ -80,6 +80,13 @@ packages:
       url: "https://github.com/MarkOSullivan94/dart_config.git"
     source: git
     version: "0.5.0"
+  dots_indicator:
+    dependency: "direct main"
+    description:
+      name: dots_indicator
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.4"
   firebase_analytics:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -13,6 +13,7 @@ dependencies:
   flutter_crashlytics: ^0.2.0
   shared_preferences: ^0.4.3
   url_launcher: ^4.0.3
+  dots_indicator: ^0.0.3
 
 dev_dependencies:
   flutter_launcher_icons: "^0.7.0"