working save and load functionality with custom datastructures

frontend/lib/pages/overview.dart

@@ -1,10 +1,11 @@
-import 'package:fast_network_navigation/modules/greeter.dart';
-import 'package:fast_network_navigation/structs/trip.dart';
 import 'package:flutter/material.dart';
 import 'package:sliding_up_panel/sliding_up_panel.dart';
 
+import 'package:fast_network_navigation/structs/trip.dart';
+
 import 'package:fast_network_navigation/modules/landmarks_overview.dart';
 import 'package:fast_network_navigation/modules/map.dart';
+import 'package:fast_network_navigation/modules/greeter.dart';
 
 
 
@@ -25,16 +26,16 @@ class _NavigationOverviewState extends State<NavigationOverview> {
 
   @override
   Widget build(BuildContext context) {
-    final ThemeData theme = Theme.of(context);
     return SlidingUpPanel(
         renderPanelSheet: false,
-        panel: _floatingPanel(theme),
-        collapsed: _floatingCollapsed(theme),
+        panel: _floatingPanel(),
+        collapsed: _floatingCollapsed(),
         body: MapWidget(trip: widget.trip)
     );
   }
 
-  Widget _floatingCollapsed(ThemeData theme){
+  Widget _floatingCollapsed(){
+    final ThemeData theme = Theme.of(context);
     return Container(
       decoration: BoxDecoration(
         color: theme.canvasColor,
@@ -42,11 +43,12 @@ class _NavigationOverviewState extends State<NavigationOverview> {
         boxShadow: []
       ),
       
-      child: Greeter(theme)
+      child: Greeter(standalone: true, trip: widget.trip)
     );
   }
 
-  Widget _floatingPanel(ThemeData theme){
+  Widget _floatingPanel(){
+    final ThemeData theme = Theme.of(context);
     return Container(
       decoration: BoxDecoration(
         color: Colors.white,
@@ -64,7 +66,7 @@ class _NavigationOverviewState extends State<NavigationOverview> {
         child: SingleChildScrollView(
           child: Column(
             children: <Widget>[
-              Greeter(theme, full: true),
+              Greeter(standalone: false, trip: widget.trip),
               LandmarksOverview(trip: widget.trip),
             ],
           ),