tentatively shrink trip overview, nicer onboarding

frontend/lib/main.dart

@@ -1,10 +1,12 @@
 import 'package:anyway/utils/get_first_page.dart';
+import 'package:anyway/utils/load_trips.dart';
 import 'package:flutter/material.dart';
 import 'package:anyway/constants.dart';
 
 void main() => runApp(const App());
 
 final GlobalKey<ScaffoldMessengerState> rootScaffoldMessengerKey = GlobalKey<ScaffoldMessengerState>();
+final SavedTrips savedTrips = SavedTrips();
 
 class App extends StatelessWidget {
   const App({super.key});

frontend/lib/modules/current_trip_save_button.dart

@@ -3,7 +3,6 @@ import 'package:anyway/main.dart';
 import 'package:anyway/structs/trip.dart';
 import 'package:auto_size_text/auto_size_text.dart';
 import 'package:flutter/material.dart';
-import 'package:shared_preferences/shared_preferences.dart';
 
 
 class saveButton extends StatefulWidget {
@@ -19,8 +18,9 @@ class _saveButtonState extends State<saveButton> {
   Widget build(BuildContext context) {
     return ElevatedButton(
       onPressed: () async {
-        SharedPreferences prefs = await SharedPreferences.getInstance();
+        savedTrips.addTrip(widget.trip);
-        setState(() => widget.trip.toPrefs(prefs));
+        // SharedPreferences prefs = await SharedPreferences.getInstance();
+        // setState(() => widget.trip.toPrefs(prefs));
         rootScaffoldMessengerKey.currentState!.showSnackBar(
           SnackBar(
             content: Text('Trip saved'),

frontend/lib/modules/trips_saved_list.dart

@@ -1,11 +1,12 @@
 import 'package:anyway/pages/current_trip.dart';
+import 'package:anyway/utils/load_trips.dart';
 import 'package:flutter/material.dart';
 
 import 'package:anyway/structs/trip.dart';
 
 
 class TripsOverview extends StatefulWidget {
-  final Future<List<Trip>> trips;
+  final SavedTrips trips;
   const TripsOverview({
     super.key,
     required this.trips,
@@ -16,11 +17,11 @@ class TripsOverview extends StatefulWidget {
 }
 
 class _TripsOverviewState extends State<TripsOverview> {
-  Widget listBuild (BuildContext context, AsyncSnapshot<List<Trip>> snapshot) {
+  Widget listBuild (BuildContext context, SavedTrips trips) {
     List<Widget> children;
-    if (snapshot.hasData) {
+    List<Trip> items = trips.trips;
-      children = List<Widget>.generate(snapshot.data!.length, (index) {
+    children = List<Widget>.generate(items.length, (index) {
-        Trip trip = snapshot.data![index];
+      Trip trip = items[index];
       return ListTile(
         title: FutureBuilder(
           future: trip.cityName,
@@ -44,21 +45,6 @@ class _TripsOverviewState extends State<TripsOverview> {
         },
       );
     });
-    } else if (snapshot.hasError) {
-      children = [
-        const Icon(
-          Icons.error_outline,
-          color: Colors.red,
-          size: 60,
-        ),
-        Padding(
-          padding: const EdgeInsets.only(top: 16),
-          child: Text('Error: ${snapshot.error}'),
-        ),
-      ];
-    } else {
-      children = [Center(child: CircularProgressIndicator())];
-    }
 
     return ListView(
       children: children,
@@ -68,9 +54,11 @@ class _TripsOverviewState extends State<TripsOverview> {
 
   @override
   Widget build(BuildContext context) {
-    return FutureBuilder(
+    return ListenableBuilder(
-      future: widget.trips,
+      listenable: widget.trips,
-      builder: listBuild,
+      builder: (BuildContext context, Widget? child) {
+        return listBuild(context, widget.trips);
+      }
     );
   }
 }

frontend/lib/pages/base_page.dart

@@ -1,3 +1,4 @@
+import 'package:anyway/main.dart';
 import 'package:anyway/modules/help_dialog.dart';
 import 'package:anyway/pages/current_trip.dart';
 import 'package:anyway/pages/settings.dart';
@@ -38,7 +39,8 @@ class _BasePageState extends State<BasePage> {
 
   @override
   Widget build(BuildContext context) {
-    Future<List<Trip>> trips = loadTrips();
+    savedTrips.loadTrips();
+
 
     return Scaffold(
       appBar: AppBar(
@@ -98,11 +100,11 @@ class _BasePageState extends State<BasePage> {
             // through the options in the drawer if there isn't enough vertical
             // space to fit everything.
             Expanded(
-              child: TripsOverview(trips: trips),
+              child: TripsOverview(trips: savedTrips),
             ),
             ElevatedButton(
               onPressed: () async {
-                removeAllTripsFromPrefs();
+                savedTrips.clearTrips();
               },
               child: const Text('Clear trips'),
             ),

frontend/lib/pages/onboarding.dart

@@ -1,3 +1,6 @@
+import 'dart:ui';
+
+import 'package:anyway/constants.dart';
 import 'package:anyway/modules/onboarding_card.dart';
 import 'package:anyway/pages/new_trip_location.dart';
 import 'package:flutter/material.dart';
@@ -33,22 +36,42 @@ class OnboardingPage extends StatefulWidget {
 }
 
 class _OnboardingPageState extends State<OnboardingPage> {
-  @override
-  Widget build(BuildContext context) {
   final PageController _controller = PageController();
 
+  @override
+  Widget build(BuildContext context) {
     return Scaffold(
       body: Stack(
+        children: [
+          AnimatedBuilder(
+            animation: _controller,
+            builder: (context, child) {
+              return Stack(
                 children: [
                   Container(
                     decoration: BoxDecoration(
                       gradient: LinearGradient(
-                colors: [Colors.red, Colors.blue],
                         begin: Alignment.topLeft,
                         end: Alignment.bottomRight,
+                        colors: APP_GRADIENT.colors,
+                        stops: [
+                          (_controller.hasClients ? _controller.page ?? _controller.initialPage : _controller.initialPage) / onboardingCards.length,
+                          (_controller.hasClients ? _controller.page ?? _controller.initialPage + 1 : _controller.initialPage + 1) / onboardingCards.length,
+                        ],
                       ),
                     ),
-            child: PageView(
+                  ),
+                  BackdropFilter(
+                    filter: ImageFilter.blur(sigmaX: 100, sigmaY: 100),
+                    child: Container(
+                      color: Colors.black.withOpacity(0),
+                    ),
+                  ),
+                ],
+              );
+            },
+          ),
+          PageView(
             controller: _controller,
             children: List.generate(
               onboardingCards.length,
@@ -60,7 +83,6 @@ class _OnboardingPageState extends State<OnboardingPage> {
               }
             ),
           ),
-          ),
         ],
       ),
       floatingActionButton: FloatingActionButton.extended(
@@ -75,10 +97,10 @@ class _OnboardingPageState extends State<OnboardingPage> {
             _controller.nextPage(duration: Duration(milliseconds: 500), curve: Curves.ease);
           }
         },
-        label: ListenableBuilder(
+        label: AnimatedBuilder(
-          listenable: _controller,
+          animation: _controller,
           builder: (context, child) {
-            if (_controller.page == onboardingCards.length - 1) {
+            if ((_controller.page ?? _controller.initialPage) == onboardingCards.length - 1) {
               return Row(
                 children: [
                   const Text("Start planning!"),

frontend/lib/structs/trip.dart

@@ -113,10 +113,3 @@ LinkedList<Landmark> readLandmarks(SharedPreferences prefs, String? firstUUID) {
   }
   return landmarks;
 }
-
-
-
-void removeAllTripsFromPrefs () async {
-  SharedPreferences prefs = await SharedPreferences.getInstance();
-  prefs.clear();
-}

frontend/lib/utils/get_first_page.dart

@@ -5,23 +5,37 @@ import 'package:anyway/utils/load_trips.dart';
 import 'package:flutter/material.dart';
 
 Widget getFirstPage() {
-  Future<List<Trip>> trips = loadTrips();
+  SavedTrips trips = SavedTrips();
-  // test if there are any active trips
+  trips.loadTrips();
-  // if there are, return the trip list
+
-  // if there are not, return the onboarding page
+  return ListenableBuilder(
-  return FutureBuilder(
+    listenable: trips,
-    future: trips,
+    builder: (BuildContext context, Widget? child) {
-    builder: (context, snapshot) {
+      List<Trip> items = trips.trips;
-      if (snapshot.hasData) {
+      if (items.isNotEmpty) {
-        List<Trip> availableTrips = snapshot.data!;
+        return TripPage(trip: items[0]);
-        if (availableTrips.isNotEmpty) {
-          return TripPage(trip: availableTrips[0]);
       } else {
         return OnboardingPage();
       }
-      } else {
-        return CircularProgressIndicator();
-      }
     }
   );
+  // Future<List<Trip>> trips = loadTrips();
+  // // test if there are any active trips
+  // // if there are, return the trip list
+  // // if there are not, return the onboarding page
+  // return FutureBuilder(
+  //   future: trips,
+  //   builder: (context, snapshot) {
+  //     if (snapshot.hasData) {
+  //       List<Trip> availableTrips = snapshot.data!;
+  //       if (availableTrips.isNotEmpty) {
+  //         return TripPage(trip: availableTrips[0]);
+  //       } else {
+  //         return OnboardingPage();
+  //       }
+  //     } else {
+  //       return CircularProgressIndicator();
+  //     }
+  //   }
+  // );
 }

frontend/lib/utils/load_trips.dart

@@ -1,7 +1,14 @@
 import 'package:anyway/structs/trip.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
-Future<List<Trip>> loadTrips() async {
+import 'package:flutter/foundation.dart';
+
+class SavedTrips extends ChangeNotifier {
+  List<Trip> _trips = [];
+
+  List<Trip> get trips => _trips;
+
+  void loadTrips() async {
     SharedPreferences prefs = await SharedPreferences.getInstance();
 
     List<Trip> trips = [];
@@ -12,5 +19,21 @@ Future<List<Trip>> loadTrips() async {
         trips.add(Trip.fromPrefs(prefs, uuid));
       }
     }
-  return trips;
+    _trips = trips;
+    notifyListeners();
+  }
+
+  void addTrip(Trip trip) async {
+    SharedPreferences prefs = await SharedPreferences.getInstance();
+    trip.toPrefs(prefs);
+    _trips.add(trip);
+    notifyListeners();
+  }
+
+  void clearTrips () async {
+    SharedPreferences prefs = await SharedPreferences.getInstance();
+    prefs.clear();
+    _trips = [];
+    notifyListeners();
+  }
 }