dart migrate `place_tracker` (#831)

place_tracker/ios/Podfile.lock

@@ -2,7 +2,7 @@ PODS:
   - Flutter (1.0.0)
   - google_maps_flutter (0.0.1):
     - Flutter
-    - GoogleMaps (< 3.10)
+    - GoogleMaps
   - GoogleMaps (3.9.0):
     - GoogleMaps/Maps (= 3.9.0)
   - GoogleMaps/Base (3.9.0)
@@ -25,7 +25,7 @@ EXTERNAL SOURCES:
 
 SPEC CHECKSUMS:
   Flutter: 434fef37c0980e73bb6479ef766c45957d4b510c
-  google_maps_flutter: c7f9c73576de1fbe152a227bfd6e6c4ae8088619
+  google_maps_flutter: df4e7de95264aa0a2f11aac0fc7e313acb8ffc7e
   GoogleMaps: 4b5346bddfe6911bb89155d43c903020170523ac
 
 PODFILE CHECKSUM: aafe91acc616949ddb318b77800a7f51bffa2a4c

place_tracker/lib/place.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/material.dart';
 import 'package:google_maps_flutter/google_maps_flutter.dart';
 
 class Place {
@@ -10,33 +9,29 @@ class Place {
   final LatLng latLng;
   final String name;
   final PlaceCategory category;
-  final String description;
+  final String? description;
   final int starRating;
 
   const Place({
-    @required this.id,
-    @required this.latLng,
-    @required this.name,
-    @required this.category,
+    required this.id,
+    required this.latLng,
+    required this.name,
+    required this.category,
     this.description,
     this.starRating = 0,
-  })  : assert(id != null),
-        assert(latLng != null),
-        assert(name != null),
-        assert(category != null),
-        assert(starRating != null && starRating >= 0 && starRating <= 5);
+  }) : assert(starRating >= 0 && starRating <= 5);
 
   double get latitude => latLng.latitude;
 
   double get longitude => latLng.longitude;
 
   Place copyWith({
-    String id,
-    LatLng latLng,
-    String name,
-    PlaceCategory category,
-    String description,
-    int starRating,
+    String? id,
+    LatLng? latLng,
+    String? name,
+    PlaceCategory? category,
+    String? description,
+    int? starRating,
   }) {
     return Place(
       id: id ?? this.id,

place_tracker/lib/place_details.dart

@@ -15,20 +15,18 @@ class PlaceDetails extends StatefulWidget {
   final ValueChanged<Place> onChanged;
 
   const PlaceDetails({
-    @required this.place,
-    @required this.onChanged,
-    Key key,
-  })  : assert(place != null),
-        assert(onChanged != null),
-        super(key: key);
+    required this.place,
+    required this.onChanged,
+    Key? key,
+  }) : super(key: key);
 
   @override
   PlaceDetailsState createState() => PlaceDetailsState();
 }
 
 class PlaceDetailsState extends State<PlaceDetails> {
-  Place _place;
-  GoogleMapController _mapController;
+  late Place _place;
+  GoogleMapController? _mapController;
   final Set<Marker> _markers = {};
   final TextEditingController _nameController = TextEditingController();
   final TextEditingController _descriptionController = TextEditingController();
@@ -65,7 +63,7 @@ class PlaceDetailsState extends State<PlaceDetails> {
   void initState() {
     _place = widget.place;
     _nameController.text = _place.name;
-    _descriptionController.text = _place.description;
+    _descriptionController.text = _place.description!;
     return super.initState();
   }
 
@@ -124,12 +122,10 @@ class _DescriptionTextField extends StatelessWidget {
 
   final ValueChanged<String> onChanged;
   const _DescriptionTextField({
-    @required this.controller,
-    @required this.onChanged,
-    Key key,
-  })  : assert(controller != null),
-        assert(onChanged != null),
-        super(key: key);
+    required this.controller,
+    required this.onChanged,
+    Key? key,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -155,18 +151,16 @@ class _DescriptionTextField extends StatelessWidget {
 class _Map extends StatelessWidget {
   final LatLng center;
 
-  final GoogleMapController mapController;
+  final GoogleMapController? mapController;
   final ArgumentCallback<GoogleMapController> onMapCreated;
   final Set<Marker> markers;
   const _Map({
-    @required this.center,
-    @required this.mapController,
-    @required this.onMapCreated,
-    @required this.markers,
-    Key key,
-  })  : assert(center != null),
-        assert(onMapCreated != null),
-        super(key: key);
+    required this.center,
+    required this.mapController,
+    required this.onMapCreated,
+    required this.markers,
+    Key? key,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -198,12 +192,10 @@ class _NameTextField extends StatelessWidget {
 
   final ValueChanged<String> onChanged;
   const _NameTextField({
-    @required this.controller,
-    @required this.onChanged,
-    Key key,
-  })  : assert(controller != null),
-        assert(onChanged != null),
-        super(key: key);
+    required this.controller,
+    required this.onChanged,
+    Key? key,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -227,7 +219,7 @@ class _NameTextField extends StatelessWidget {
 
 class _Reviews extends StatelessWidget {
   const _Reviews({
-    Key key,
+    Key? key,
   }) : super(key: key);
 
   @override
@@ -320,11 +312,10 @@ class _StarBar extends StatelessWidget {
   final int rating;
   final ValueChanged<int> onChanged;
   const _StarBar({
-    @required this.rating,
-    @required this.onChanged,
-    Key key,
-  })  : assert(rating != null && rating >= 0 && rating <= maxStars),
-        assert(onChanged != null),
+    required this.rating,
+    required this.onChanged,
+    Key? key,
+  })  : assert(rating >= 0 && rating <= maxStars),
         super(key: key);
 
   @override

place_tracker/lib/place_list.dart

@@ -10,7 +10,7 @@ import 'place_details.dart';
 import 'place_tracker_app.dart';
 
 class PlaceList extends StatefulWidget {
-  const PlaceList({Key key}) : super(key: key);
+  const PlaceList({Key? key}) : super(key: key);
 
   @override
   PlaceListState createState() => PlaceListState();
@@ -69,17 +69,15 @@ class _CategoryButton extends StatelessWidget {
   final bool selected;
   final ValueChanged<PlaceCategory> onCategoryChanged;
   const _CategoryButton({
-    Key key,
-    @required this.category,
-    @required this.selected,
-    @required this.onCategoryChanged,
-  })  : assert(category != null),
-        assert(selected != null),
-        super(key: key);
+    Key? key,
+    required this.category,
+    required this.selected,
+    required this.onCategoryChanged,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
-    String _buttonText;
+    late String _buttonText;
     switch (category) {
       case PlaceCategory.favorite:
         _buttonText = 'Favorites';
@@ -122,12 +120,10 @@ class _ListCategoryButtonBar extends StatelessWidget {
 
   final ValueChanged<PlaceCategory> onCategoryChanged;
   const _ListCategoryButtonBar({
-    Key key,
-    @required this.selectedCategory,
-    @required this.onCategoryChanged,
-  })  : assert(selectedCategory != null),
-        assert(onCategoryChanged != null),
-        super(key: key);
+    Key? key,
+    required this.selectedCategory,
+    required this.onCategoryChanged,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -159,12 +155,10 @@ class _PlaceListTile extends StatelessWidget {
 
   final ValueChanged<Place> onPlaceChanged;
   const _PlaceListTile({
-    Key key,
-    @required this.place,
-    @required this.onPlaceChanged,
-  })  : assert(place != null),
-        assert(onPlaceChanged != null),
-        super(key: key);
+    Key? key,
+    required this.place,
+    required this.onPlaceChanged,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {

place_tracker/lib/place_map.dart

@@ -21,10 +21,9 @@ class MapConfiguration {
   final PlaceCategory selectedCategory;
 
   const MapConfiguration({
-    @required this.places,
-    @required this.selectedCategory,
-  })  : assert(places != null),
-        assert(selectedCategory != null);
+    required this.places,
+    required this.selectedCategory,
+  });
 
   @override
   int get hashCode => places.hashCode ^ selectedCategory.hashCode;
@@ -53,10 +52,10 @@ class MapConfiguration {
 }
 
 class PlaceMap extends StatefulWidget {
-  final LatLng center;
+  final LatLng? center;
 
   const PlaceMap({
-    Key key,
+    Key? key,
     this.center,
   }) : super(key: key);
 
@@ -69,15 +68,15 @@ class PlaceMapState extends State<PlaceMap> {
 
   MapType _currentMapType = MapType.normal;
 
-  LatLng _lastMapPosition;
+  LatLng? _lastMapPosition;
 
   final Map<Marker, Place> _markedPlaces = <Marker, Place>{};
 
   final Set<Marker> _markers = {};
 
-  Marker _pendingMarker;
+  Marker? _pendingMarker;
 
-  MapConfiguration _configuration;
+  MapConfiguration? _configuration;
 
   @override
   Widget build(BuildContext context) {
@@ -95,7 +94,7 @@ class PlaceMapState extends State<PlaceMap> {
             GoogleMap(
               onMapCreated: onMapCreated,
               initialCameraPosition: CameraPosition(
-                target: widget.center,
+                target: widget.center!,
                 zoom: 11.0,
               ),
               mapType: _currentMapType,
@@ -173,9 +172,9 @@ class PlaceMapState extends State<PlaceMap> {
     if (_pendingMarker != null) {
       // Create a new Place and map it to the marker we just added.
       final newPlace = Place(
-        id: Uuid().v1(),
-        latLng: _pendingMarker.position,
-        name: _pendingMarker.infoWindow.title,
+        id: const Uuid().v1(),
+        latLng: _pendingMarker!.position,
+        name: _pendingMarker!.infoWindow.title!,
         category:
             Provider.of<AppState>(context, listen: false).selectedCategory,
       );
@@ -184,7 +183,7 @@ class PlaceMapState extends State<PlaceMap> {
           Provider.of<AppState>(context, listen: false).selectedCategory);
 
       setState(() {
-        final updatedMarker = _pendingMarker.copyWith(
+        final updatedMarker = _pendingMarker!.copyWith(
           iconParam: placeMarker,
           infoWindowParam: InfoWindow(
             title: 'New Place',
@@ -263,9 +262,9 @@ class PlaceMapState extends State<PlaceMap> {
     // changes come from the [place_map], we should only enter this if statement
     // when returning to the [place_map] after changes have been made from
     // [place_list].
-    if (_configuration != newConfiguration && mapController != null) {
-      if (_configuration.places == newConfiguration.places &&
-          _configuration.selectedCategory !=
+    if (_configuration != newConfiguration) {
+      if (_configuration!.places == newConfiguration.places &&
+          _configuration!.selectedCategory !=
               newConfiguration.selectedCategory) {
         // If the configuration change is only a category change, just update
         // the marker visibilities.
@@ -274,7 +273,7 @@ class PlaceMapState extends State<PlaceMap> {
         // At this point, we know the places have been updated from the list
         // view. We need to reconfigure the map to respect the updates.
         newConfiguration.places
-            .where((p) => !_configuration.places.contains(p))
+            .where((p) => !_configuration!.places.contains(p))
             .map((value) => _updateExistingPlaceMarker(place: value));
 
         await _zoomToFitPlaces(
@@ -292,7 +291,7 @@ class PlaceMapState extends State<PlaceMap> {
     setState(() {
       final newMarker = Marker(
         markerId: MarkerId(_lastMapPosition.toString()),
-        position: _lastMapPosition,
+        position: _lastMapPosition!,
         infoWindow: const InfoWindow(title: 'New Place'),
         draggable: true,
         icon: BitmapDescriptor.defaultMarkerWithHue(BitmapDescriptor.hueGreen),
@@ -333,8 +332,6 @@ class PlaceMapState extends State<PlaceMap> {
   }
 
   void _pushPlaceDetailsScreen(Place place) {
-    assert(place != null);
-
     Navigator.push<void>(
       context,
       MaterialPageRoute(builder: (context) {
@@ -349,7 +346,7 @@ class PlaceMapState extends State<PlaceMap> {
   Future<void> _showPlacesForSelectedCategory(PlaceCategory category) async {
     setState(() {
       for (var marker in List.of(_markedPlaces.keys)) {
-        final place = _markedPlaces[marker];
+        final place = _markedPlaces[marker]!;
         final updatedMarker = marker.copyWith(
           visibleParam: place.category == category,
         );
@@ -373,9 +370,9 @@ class PlaceMapState extends State<PlaceMap> {
     await _showPlacesForSelectedCategory(category);
   }
 
-  void _updateExistingPlaceMarker({@required Place place}) {
+  void _updateExistingPlaceMarker({required Place place}) {
     var marker = _markedPlaces.keys
-        .singleWhere((value) => _markedPlaces[value].id == place.id);
+        .singleWhere((value) => _markedPlaces[value]!.id == place.id);
 
     setState(() {
       final updatedMarker = marker.copyWith(
@@ -390,9 +387,9 @@ class PlaceMapState extends State<PlaceMap> {
   }
 
   void _updateMarker({
-    @required Marker marker,
-    @required Marker updatedMarker,
-    @required Place place,
+    required Marker? marker,
+    required Marker updatedMarker,
+    required Place place,
   }) {
     _markers.remove(marker);
     _markedPlaces.remove(marker);
@@ -405,10 +402,10 @@ class PlaceMapState extends State<PlaceMap> {
     var controller = await mapController.future;
 
     // Default min/max values to latitude and longitude of center.
-    var minLat = widget.center.latitude;
-    var maxLat = widget.center.latitude;
-    var minLong = widget.center.longitude;
-    var maxLong = widget.center.longitude;
+    var minLat = widget.center!.latitude;
+    var maxLat = widget.center!.latitude;
+    var minLong = widget.center!.longitude;
+    var maxLong = widget.center!.longitude;
 
     for (var place in places) {
       minLat = min(minLat, place.latitude);
@@ -435,12 +432,10 @@ class PlaceMapState extends State<PlaceMap> {
         return BitmapDescriptor.fromAssetImage(
             createLocalImageConfiguration(context, size: const Size.square(32)),
             'assets/heart.png');
-        break;
       case PlaceCategory.visited:
         return BitmapDescriptor.fromAssetImage(
             createLocalImageConfiguration(context, size: const Size.square(32)),
             'assets/visited.png');
-        break;
       case PlaceCategory.wantToGo:
       default:
         return BitmapDescriptor.defaultMarker;
@@ -460,14 +455,11 @@ class _AddPlaceButtonBar extends StatelessWidget {
   final VoidCallback onCancelPressed;
 
   const _AddPlaceButtonBar({
-    Key key,
-    @required this.visible,
-    @required this.onSavePressed,
-    @required this.onCancelPressed,
-  })  : assert(visible != null),
-        assert(onSavePressed != null),
-        assert(onCancelPressed != null),
-        super(key: key);
+    Key? key,
+    required this.visible,
+    required this.onSavePressed,
+    required this.onCancelPressed,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -508,14 +500,11 @@ class _CategoryButtonBar extends StatelessWidget {
   final ValueChanged<PlaceCategory> onChanged;
 
   const _CategoryButtonBar({
-    Key key,
-    @required this.selectedPlaceCategory,
-    @required this.visible,
-    @required this.onChanged,
-  })  : assert(selectedPlaceCategory != null),
-        assert(visible != null),
-        assert(onChanged != null),
-        super(key: key);
+    Key? key,
+    required this.selectedPlaceCategory,
+    required this.visible,
+    required this.onChanged,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -573,14 +562,11 @@ class _MapFabs extends StatelessWidget {
   final VoidCallback onToggleMapTypePressed;
 
   const _MapFabs({
-    Key key,
-    @required this.visible,
-    @required this.onAddPlacePressed,
-    @required this.onToggleMapTypePressed,
-  })  : assert(visible != null),
-        assert(onAddPlacePressed != null),
-        assert(onToggleMapTypePressed != null),
-        super(key: key);
+    Key? key,
+    required this.visible,
+    required this.onAddPlacePressed,
+    required this.onToggleMapTypePressed,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {

place_tracker/lib/place_tracker_app.dart

@@ -17,7 +17,7 @@ enum PlaceTrackerViewType {
 }
 
 class PlaceTrackerApp extends StatelessWidget {
-  const PlaceTrackerApp({Key key}) : super(key: key);
+  const PlaceTrackerApp({Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -28,7 +28,7 @@ class PlaceTrackerApp extends StatelessWidget {
 }
 
 class _PlaceTrackerHomePage extends StatelessWidget {
-  const _PlaceTrackerHomePage({Key key}) : super(key: key);
+  const _PlaceTrackerHomePage({Key? key}) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -83,8 +83,7 @@ class AppState extends ChangeNotifier {
     this.places = StubData.places,
     this.selectedCategory = PlaceCategory.favorite,
     this.viewType = PlaceTrackerViewType.map,
-  })  : assert(places != null),
-        assert(selectedCategory != null);
+  });
 
   List<Place> places;
   PlaceCategory selectedCategory;

place_tracker/pubspec.lock

@@ -43,27 +43,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.15.0"
-  convert:
-    dependency: transitive
-    description:
-      name: convert
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.1.1"
   crypto:
     dependency: transitive
     description:
       name: crypto
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.1.5"
+    version: "3.0.1"
   csslib:
     dependency: transitive
     description:
       name: csslib
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.16.2"
+    version: "0.17.0"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -96,7 +89,7 @@ packages:
       name: flutter_plugin_android_lifecycle
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.11"
+    version: "2.0.2"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -113,35 +106,35 @@ packages:
       name: google_maps
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.4.5"
+    version: "5.1.0"
   google_maps_flutter:
     dependency: "direct main"
     description:
       name: google_maps_flutter
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "2.0.6"
   google_maps_flutter_platform_interface:
     dependency: transitive
     description:
       name: google_maps_flutter_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "2.0.4"
   google_maps_flutter_web:
     dependency: "direct main"
     description:
       name: google_maps_flutter_web
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.1.1"
+    version: "0.3.0+1"
   html:
     dependency: transitive
     description:
       name: html
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.14.0+4"
+    version: "0.15.0"
   js:
     dependency: transitive
     description:
@@ -155,7 +148,7 @@ packages:
       name: js_wrapping
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.5.0"
+    version: "0.7.0"
   lints:
     dependency: transitive
     description:
@@ -197,21 +190,21 @@ packages:
       name: plugin_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.3"
+    version: "2.0.0"
   provider:
     dependency: "direct main"
     description:
       name: provider
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.3.3"
+    version: "5.0.0"
   sanitize_html:
     dependency: transitive
     description:
       name: sanitize_html
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.4.1"
+    version: "2.0.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -244,7 +237,7 @@ packages:
       name: stream_transform
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.2.0"
+    version: "2.0.0"
   string_scanner:
     dependency: transitive
     description:
@@ -279,7 +272,7 @@ packages:
       name: uuid
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.2.2"
+    version: "3.0.4"
   vector_math:
     dependency: transitive
     description:
@@ -289,4 +282,4 @@ packages:
     version: "2.1.0"
 sdks:
   dart: ">=2.12.0 <3.0.0"
-  flutter: ">=1.22.0"
+  flutter: ">=2.0.0"

place_tracker/pubspec.yaml

@@ -4,17 +4,17 @@ description: A new Flutter project.
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.10.0 <3.0.0"
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   flutter:
     sdk: flutter
 
   cupertino_icons: ^1.0.0
-  google_maps_flutter: ^1.0.6
-  google_maps_flutter_web: ^0.1.0
-  provider: ^4.0.0
-  uuid: ^2.0.4
+  google_maps_flutter: ^2.0.6
+  google_maps_flutter_web: ^0.3.0+1
+  provider: ^5.0.0
+  uuid: ^3.0.4
 
 dev_dependencies:
   flutter_test: