Fixes #20 : Added Custom Router with animation

lib/main.dart

@@ -4,6 +4,27 @@ import 'package:cerebro_flutter/screens/events.dart';
 
 void main() => runApp(MyApp());
 
+class CustomRoute<T> extends MaterialPageRoute<T> {
+  CustomRoute({WidgetBuilder builder, RouteSettings settings})
+      : super(builder: builder, settings: settings);
+
+  @override
+  Widget buildTransitions(BuildContext context, Animation<double> anim,
+      Animation<double> secondaryAnim, Widget child) {
+    if (settings.isInitialRoute) return child;
+    // Slide Transition for routing
+    return SlideTransition(
+      position: Tween<Offset>(begin: Offset(1.0, 0.0), end: Offset.zero)
+          .animate(anim),
+      child: SlideTransition(
+        position: Tween<Offset>(begin: Offset.zero, end: Offset(1.0, 0.0))
+            .animate(secondaryAnim),
+        child: child,
+      ),
+    );
+  }
+}
+
 class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
@@ -12,8 +33,15 @@ class MyApp extends StatelessWidget {
       title: 'Events',
       home: Splash(),
       theme: ThemeData.dark(),
-      routes: {
-        '/events': (context) => EventsPage(),
+      onGenerateRoute: (RouteSettings settings) {
+        switch (settings.name) {
+          case '/events':
+            return CustomRoute(
+              builder: (_) => EventsPage(),
+              settings: settings,
+            );
+        }
+        assert(false);
       },
     );
   }

lib/screens/login.dart

@@ -15,19 +15,9 @@ class LoginPage extends StatefulWidget {
 class _LoginPageState extends State<LoginPage> {
   final String _kUserPref = "UserPref";
 
-  Future<Null> getSharedPref() async {
-    final SharedPreferences _localPref = await SharedPreferences.getInstance();
-    String userProfile = _localPref.getString(_kUserPref);
-    if (userProfile != null) {
-      print('Already present user: ' + userProfile);
-      Navigator.pushNamed(context, '/events');
-    }
-  }
-
   @override
   initState() {
     super.initState();
-    getSharedPref();
   }
 
   Future<FirebaseUser> _handleSignIn() async {

lib/screens/splash.dart

@@ -1,5 +1,7 @@
 import 'package:cerebro_flutter/screens/login.dart';
+import 'package:cerebro_flutter/screens/events.dart';
 import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 import 'package:splashscreen/splashscreen.dart';
 
 class Splash extends StatefulWidget {
@@ -8,11 +10,33 @@ class Splash extends StatefulWidget {
 }
 
 class _SplashState extends State<Splash> {
+  final String _kUserPref = "UserPref";
+  Widget _routingWidget = LoginPage();
+
+  Future<Null> getSharedPref() async {
+    final SharedPreferences _localPref = await SharedPreferences.getInstance();
+    String userProfile = _localPref.getString(_kUserPref);
+    // Check if user is already saved in Shared Preference then move to Events Page
+    // and not to LoginPage
+    if (userProfile != null) {
+      print('Already present user: ' + userProfile);
+      setState(() {
+        _routingWidget = EventsPage();
+      });
+    }
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    getSharedPref();
+  }
+
   @override
   Widget build(BuildContext context) {
     return new SplashScreen(
         seconds: 7,
-        navigateAfterSeconds: LoginPage(),
+        navigateAfterSeconds: _routingWidget,
         title: Text(
           'Just wait a little longer...',
           style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20.0),