add locations by search

lib/components/locations/add_location_by_search_form.dart

@@ -0,0 +1,93 @@
+import 'package:flutter/material.dart';
+import 'package:wetter/models/location_model.dart';
+import 'package:wetter/services/openstreetmap_api_service.dart';
+import 'package:wetter/services/utils.dart';
+
+class AddLocationBySearchForm extends StatefulWidget {
+  final Function saveNewLocation;
+
+  const AddLocationBySearchForm({Key? key, required this.saveNewLocation})
+      : super(key: key);
+
+  @override
+  State<AddLocationBySearchForm> createState() =>
+      _AddLocationBySearchFormState();
+}
+
+class _AddLocationBySearchFormState extends State<AddLocationBySearchForm> {
+  final _formKey = GlobalKey<FormState>();
+  final searchLocationFormController = TextEditingController();
+  final _debouncer = Debouncer(milliseconds: 500);
+  bool _showResults = false;
+  bool _locationSearchHasFocus = false;
+  List<LocationModel>? _locations;
+
+  @override
+  Widget build(BuildContext context) {
+    return Form(
+        key: _formKey,
+        child: Column(
+          children: [
+            FocusScope(
+                child: Focus(
+                    onFocusChange: (focus) {
+                      setState(() {
+                        _locationSearchHasFocus = !_locationSearchHasFocus;
+                      });
+                    },
+                    child: TextFormField(
+                      onChanged: (value) {
+                        _debouncer.run(() {
+                          OpenStreetMapAPI.getLocationsFromSearch(value)
+                              .then((l) {
+                            setState(() {
+                              _locations = l;
+                              _showResults = true;
+                            });
+                          });
+                        });
+                      },
+                      decoration: const InputDecoration(
+                          border: UnderlineInputBorder(),
+                          labelText: "Location Name"),
+                    ))),
+            if (_showResults && _locationSearchHasFocus) _showResultList(),
+          ],
+        ));
+  }
+
+  Column _showResultList() {
+    if (_locations == null) {
+      return Column(
+        children: const [],
+      );
+    }
+    if (_locations!.isEmpty) {
+      return Column(
+        children: [_singleResult(name: "No result")],
+      );
+    }
+    return Column(children: [
+      for (LocationModel location in _locations!.getRange(0, 3))
+        _singleResult(name: location.name, location: location)
+    ]);
+  }
+
+  Widget _singleResult({required String name, LocationModel? location}) {
+    return GestureDetector(
+        onTap: () {
+          if (location != null) {
+            widget.saveNewLocation(
+                location.name, location.latitude, location.longitude);
+          }
+        },
+        child: Card(
+            child: Padding(
+                padding: const EdgeInsets.all(5),
+                child: Row(children: [
+                  Flexible(
+                      child: Text(name,
+                          style: Theme.of(context).textTheme.titleMedium))
+                ]))));
+  }
+}

lib/models/location_model.dart

@@ -0,0 +1,13 @@
+class LocationModel {
+  late double latitude;
+  late double longitude;
+  late String name;
+
+  LocationModel();
+
+  LocationModel.fromJson(Map<String, dynamic> json) {
+    name = json["display_name"];
+    latitude = double.parse(json["lat"]);
+    longitude = double.parse(json["lon"]);
+  }
+}

lib/screens/locations.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:wetter/components/locations/add_location_by_search_form.dart';
 import 'package:wetter/components/locations/add_location_form.dart';
 import 'package:wetter/components/locations/manage_single_location.dart';
 import 'package:wetter/services/user_preferences.dart';
@@ -45,11 +46,16 @@ class _LocationsState extends State<Locations> {
                   for (String name in locations)
                     ManageSingleLocation(name: name, delete: deleteLocation),
                   ...[
-                    Expanded(
+                    const SizedBox(height: 20),
+                    const Text("Add location by search"),
+                    AddLocationBySearchForm(saveNewLocation: saveNewLocation),
+                    const SizedBox(height: 20),
+                    const Text("Add location by coordinates"),
+                    Flexible(
+                        fit: FlexFit.loose,
                         child: AddLocationsForm(
                             saveNewLocation: saveNewLocation,
-                          savedLocations: locations),
+                            savedLocations: locations)),
-                    )
                   ],
                 ]))));
   }

lib/services/openstreetmap_api_service.dart

@@ -0,0 +1,24 @@
+import 'dart:convert';
+
+import 'package:wetter/models/location_model.dart';
+import 'package:http/http.dart' as http;
+
+class OpenStreetMapAPI {
+  static Future<List<LocationModel>> getLocationsFromSearch(
+      String search) async {
+    final response = await http.get(
+        Uri.parse(
+            'https://nominatim.openstreetmap.org/search.php?q=$search&format=jsonv2'),
+        headers: {"Accept": "application/json"});
+    if (response.statusCode == 200) {
+      List<LocationModel> locations = [];
+      List<dynamic> results = jsonDecode(response.body);
+      for (Map<String, dynamic> result in results) {
+        locations.add(LocationModel.fromJson(result));
+      }
+      return locations;
+    } else {
+      throw Exception('Failed to load weather data');
+    }
+  }
+}

lib/services/utils.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:weather_icons/weather_icons.dart';
 
@@ -31,3 +33,18 @@ IconData weatherIcon(String icon) {
       return WeatherIcons.alien;
   }
 }
+
+class Debouncer {
+  final int milliseconds;
+  VoidCallback? action;
+  Timer? _timer;
+
+  Debouncer({required this.milliseconds});
+
+  run(VoidCallback action) {
+    if (_timer != null) {
+      _timer!.cancel();
+    }
+    _timer = Timer(Duration(milliseconds: milliseconds), action);
+  }
+}