added search functionality

lib/state/mapState.dart

@@ -1,16 +1,24 @@
 import 'package:flutter/cupertino.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:geolocator/geolocator.dart';
+import 'package:latlong2/latlong.dart';
 
 class MapState extends ChangeNotifier {
   bool _isCurrentlyLoading = false;
+  LatLng? _activeMarker;
   final MapController _mapController = MapController();
   final Geolocator _geolocator = Geolocator();
 
   bool get isCurrentlyLoading => _isCurrentlyLoading;
+  LatLng? get getActiveMarker => _activeMarker;
   MapController get getMapController => _mapController;
   Geolocator get getGeolocator => _geolocator;
 
+  void setActiveMarker(LatLng? marker) {
+    _activeMarker = marker;
+    notifyListeners();
+  }
+
   void setLoading(bool loading) {
     _isCurrentlyLoading = loading;
     notifyListeners();

lib/view/home.dart

@@ -4,9 +4,11 @@ import 'package:app/state/timeStatusState.dart';
 import 'package:app/util/loadingContainer.dart';
 import 'package:app/util/watchState.dart';
 import 'package:app/view/appInfo.dart';
+import 'package:app/view/locationSearch.dart';
 import 'package:app/view/status.dart';
 import 'package:app/view/map.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_map/flutter_map.dart';
 import 'package:geolocator/geolocator.dart';
 import 'package:latlong2/latlong.dart';
 import 'package:provider/provider.dart';
@@ -52,8 +54,16 @@ class _HomePageState extends State<HomeView> {
         actions: [
           IconButton(
             icon: const Icon(Icons.search),
-            onPressed: () {
-
+            onPressed: () async {
+              LatLng? latLng = await showSearch<LatLng?>(
+                context: context,
+                delegate: LocationSearchDelegate(),
+              );
+              MapState mapState = context.obtainState<MapState>();
+              mapState.setActiveMarker(latLng);
+              if (latLng != null) {
+                mapState.getMapController.move(latLng, 16);
+              }
             },
           ),
           IconButton(

lib/view/locationSearch.dart

@@ -0,0 +1,60 @@
+import 'package:flutter/material.dart';
+import 'package:latlong2/latlong.dart';
+import 'package:osm_nominatim/osm_nominatim.dart';
+
+class LocationSearchDelegate extends SearchDelegate<LatLng?> {
+  @override
+  List<Widget>? buildActions(BuildContext context) {
+    return [
+      IconButton(
+        icon: const Icon(Icons.clear),
+        onPressed: () => query = '',
+      )
+    ];
+  }
+
+  @override
+  Widget? buildLeading(BuildContext context) {
+    return IconButton(
+      icon: const Icon(Icons.arrow_back),
+      onPressed: () => close(context, null),
+    );
+  }
+
+  @override
+  Widget buildResults(BuildContext context) {
+    return FutureBuilder<List<Place>>(
+      future: query.isEmpty ? Future.value([]) : Nominatim.searchByName(
+          query: query,
+          limit: 10,
+          language: 'de',
+          // https://gist.github.com/graydon/11198540#file-country-bounding-boxes-py-L45
+          viewBox: ViewBox(54.983104153, 15.0169958839, 47.3024876979, 5.98865807458)
+      ),
+      builder: (BuildContext context, AsyncSnapshot<List<Place>> snapshot) {
+        switch (snapshot.connectionState) {
+          case ConnectionState.waiting:
+            return const Center(child: CircularProgressIndicator());
+          case ConnectionState.active:
+          case ConnectionState.none:
+          case ConnectionState.done:
+            return ListView.builder(
+              itemCount: snapshot.data?.length ?? 0,
+              itemBuilder: (context, index) {
+                Place place = snapshot.data![index];
+                return ListTile(
+                  title: Text(place.displayName),
+                  onTap: () => close(context, LatLng(place.lat, place.lon)),
+                );
+              },
+            );
+        }
+      },
+    );
+  }
+
+  @override
+  Widget buildSuggestions(BuildContext context) {
+    return buildResults(context);
+  }
+}

lib/view/map.dart

@@ -1,5 +1,6 @@
 import 'package:app/extensions/obtainProviderExtension.dart';
 import 'package:app/state/mapState.dart';
+import 'package:app/util/watchState.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:http/http.dart';
@@ -36,7 +37,19 @@ class _MapViewState extends State<MapView> {
                   Client(),
                   when: (response) => response.statusCode == 502)
           ),
-        )
+        ),
+        WatchState<MapState>((context, state) => state.getActiveMarker != null ? MarkerLayer(
+          markers: [
+            Marker(
+              point: state.getActiveMarker!,
+              child: const Icon(
+                Icons.location_on,
+                color: Colors.red,
+                size: 48,
+              )
+            )
+          ],
+        ) : const SizedBox.shrink())
       ],
     );
   }

pubspec.lock

@@ -384,6 +384,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.0"
+  osm_nominatim:
+    dependency: "direct main"
+    description:
+      name: osm_nominatim
+      sha256: "037f1af3abee92cf34e33b562cec1acbb0210234b1bdf3d8975bdef3849e6287"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.0"
   path:
     dependency: transitive
     description:

pubspec.yaml

@@ -43,6 +43,7 @@ dependencies:
   http: ^1.2.1
   flutter_timer_countdown: ^1.0.7
   geolocator: ^11.0.0
+  osm_nominatim: ^3.0.0
 
 dev_dependencies:
   flutter_test: