location picker and ui fixes

frontend/lib/modules/new_trip_location_search.dart

@@ -0,0 +1,64 @@
+
+// A search bar that allow the user to enter a city name
+import 'package:anyway/structs/landmark.dart';
+import 'package:geocoding/geocoding.dart';
+import 'dart:developer';
+
+import 'package:anyway/structs/trip.dart';
+import 'package:flutter/material.dart';
+
+class NewTripLocationSearch extends StatefulWidget {
+  Trip trip;
+  NewTripLocationSearch(
+    this.trip,
+  );
+
+
+  @override
+  State<NewTripLocationSearch> createState() => _NewTripLocationSearchState();
+}
+
+class _NewTripLocationSearchState extends State<NewTripLocationSearch> {
+  final TextEditingController _controller = TextEditingController();
+
+  setTripLocation (String query) async {
+    List<Location> locations = [];
+    log('Searching for: $query');
+    
+    try{
+      locations = await locationFromAddress(query);
+    } catch (e) {
+      log('No results found for: $query : $e');
+    }
+
+    if (locations.isNotEmpty) {
+      Location location = locations.first;
+      widget.trip.landmarks.clear();
+      widget.trip.addLandmark(
+        Landmark(
+          uuid: 'pending',
+          name: query,
+          location: [location.latitude, location.longitude],
+          type: start
+        )
+      );
+    }
+  }
+
+  @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(
+        onPressed: () {
+          setTripLocation(_controller.text);
+        },
+        child: Text('Search'),
+      ),]
+
+    );
+  }
+}