revamp new trip flow

frontend/lib/modules/new_trip_location_search.dart

@@ -6,9 +6,12 @@ import 'dart:developer';
 
 import 'package:anyway/structs/trip.dart';
 import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 
 class NewTripLocationSearch extends StatefulWidget {
+  Future<SharedPreferences> prefs = SharedPreferences.getInstance();
   Trip trip;
+  
   NewTripLocationSearch(
     this.trip,
   );
@@ -45,20 +48,51 @@ class _NewTripLocationSearchState extends State<NewTripLocationSearch> {
     }
   }
 
-  @override
-  Widget build(BuildContext context) {
-    return SearchBar(
-      hintText: 'Enter a city name or long press on the map.',
-      onSubmitted: setTripLocation,
-      controller: _controller,
-      leading: Icon(Icons.search),
-      trailing: [ElevatedButton(
+  late Widget locationSearchBar = SearchBar(
+    hintText: 'Enter a city name or long press on the map.',
+    onSubmitted: setTripLocation,
+    controller: _controller,
+    leading: Icon(Icons.search),
+    trailing: [
+      ElevatedButton(
         onPressed: () {
           setTripLocation(_controller.text);
         },
         child: Text('Search'),
-      ),]
+      )
+    ]
+  );
 
+
+  late Widget useCurrentLocationButton = ElevatedButton(
+    onPressed: () {
+      // setTripLocation(location);
+      // TODO: get current location
+    },
+    child: Text('Use current location'),
+  );
+
+  @override
+  Widget build(BuildContext context) {
+    return FutureBuilder(
+      future: widget.prefs,
+      builder: (context, snapshot) {
+        if (snapshot.hasData) {
+          final useLocation = snapshot.data!.getBool('useLocation') ?? false;
+          if (useLocation) {
+            return Column(
+              children: [
+                locationSearchBar,
+                useCurrentLocationButton,
+              ],
+            );
+          } else {
+            return locationSearchBar;
+          }
+        } else {
+          return locationSearchBar;
+        }
+      },
     );
   }
-}
+}