Place tracker/maintenance (#519)

* format place_tracker README

* update sentence in README

* sort Dart members, remove unnecessary type declarations

* Run place_tracker on Android and iOS, update project files

* add link to developer preview caveat

* grammar

* update MAINTENANCE

place_tracker/lib/place_details.dart

@@ -7,6 +7,9 @@ import 'place.dart';
 import 'stub_data.dart';
 
 class PlaceDetails extends StatefulWidget {
+  final Place place;
+  final ValueChanged<Place> onChanged;
+
   const PlaceDetails({
     @required this.place,
     @required this.onChanged,
@@ -15,9 +18,6 @@ class PlaceDetails extends StatefulWidget {
         assert(onChanged != null),
         super(key: key);
 
-  final Place place;
-  final ValueChanged<Place> onChanged;
-
   @override
   PlaceDetailsState createState() => PlaceDetailsState();
 }
@@ -26,10 +26,37 @@ class PlaceDetailsState extends State<PlaceDetails> {
   Place _place;
   GoogleMapController _mapController;
   final Set<Marker> _markers = {};
-
   final TextEditingController _nameController = TextEditingController();
   final TextEditingController _descriptionController = TextEditingController();
 
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('${_place.name}'),
+        backgroundColor: Colors.green[700],
+        actions: [
+          Padding(
+            padding: const EdgeInsets.fromLTRB(0.0, 0.0, 8.0, 0.0),
+            child: IconButton(
+              icon: const Icon(Icons.save, size: 30.0),
+              onPressed: () {
+                widget.onChanged(_place);
+                Navigator.pop(context);
+              },
+            ),
+          ),
+        ],
+      ),
+      body: GestureDetector(
+        onTap: () {
+          FocusScope.of(context).requestFocus(FocusNode());
+        },
+        child: _detailsBody(),
+      ),
+    );
+  }
+
   @override
   void initState() {
     _place = widget.place;
@@ -38,20 +65,10 @@ class PlaceDetailsState extends State<PlaceDetails> {
     return super.initState();
   }
 
-  void _onMapCreated(GoogleMapController controller) {
-    _mapController = controller;
-    setState(() {
-      _markers.add(Marker(
-        markerId: MarkerId(_place.latLng.toString()),
-        position: _place.latLng,
-      ));
-    });
-  }
-
   Widget _detailsBody() {
     return ListView(
       padding: const EdgeInsets.fromLTRB(24.0, 12.0, 24.0, 12.0),
-      children: <Widget>[
+      children: [
         _NameTextField(
           controller: _nameController,
           onChanged: (value) {
@@ -87,68 +104,21 @@ class PlaceDetailsState extends State<PlaceDetails> {
     );
   }
 
-  @override
-  Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: AppBar(
-        title: Text('${_place.name}'),
-        backgroundColor: Colors.green[700],
-        actions: <Widget>[
-          Padding(
-            padding: const EdgeInsets.fromLTRB(0.0, 0.0, 8.0, 0.0),
-            child: IconButton(
-              icon: const Icon(Icons.save, size: 30.0),
-              onPressed: () {
-                widget.onChanged(_place);
-                Navigator.pop(context);
-              },
-            ),
-          ),
-        ],
-      ),
-      body: GestureDetector(
-        onTap: () {
-          FocusScope.of(context).requestFocus(FocusNode());
-        },
-        child: _detailsBody(),
-      ),
-    );
-  }
-}
-
-class _NameTextField extends StatelessWidget {
-  const _NameTextField({
-    @required this.controller,
-    @required this.onChanged,
-    Key key,
-  })  : assert(controller != null),
-        assert(onChanged != null),
-        super(key: key);
-
-  final TextEditingController controller;
-  final ValueChanged<String> onChanged;
-
-  @override
-  Widget build(BuildContext context) {
-    return Padding(
-      padding: const EdgeInsets.fromLTRB(0.0, 0.0, 0.0, 16.0),
-      child: TextField(
-        decoration: const InputDecoration(
-          labelText: 'Name',
-          labelStyle: TextStyle(fontSize: 18.0),
-        ),
-        style: const TextStyle(fontSize: 20.0, color: Colors.black87),
-        autocorrect: true,
-        controller: controller,
-        onChanged: (value) {
-          onChanged(value);
-        },
-      ),
-    );
+  void _onMapCreated(GoogleMapController controller) {
+    _mapController = controller;
+    setState(() {
+      _markers.add(Marker(
+        markerId: MarkerId(_place.latLng.toString()),
+        position: _place.latLng,
+      ));
+    });
   }
 }
 
 class _DescriptionTextField extends StatelessWidget {
+  final TextEditingController controller;
+
+  final ValueChanged<String> onChanged;
   const _DescriptionTextField({
     @required this.controller,
     @required this.onChanged,
@@ -157,9 +127,6 @@ class _DescriptionTextField extends StatelessWidget {
         assert(onChanged != null),
         super(key: key);
 
-  final TextEditingController controller;
-  final ValueChanged<String> onChanged;
-
   @override
   Widget build(BuildContext context) {
     return Padding(
@@ -181,38 +148,12 @@ class _DescriptionTextField extends StatelessWidget {
   }
 }
 
-class _StarBar extends StatelessWidget {
-  const _StarBar({
-    @required this.rating,
-    @required this.onChanged,
-    Key key,
-  })  : assert(rating != null && rating >= 0 && rating <= maxStars),
-        assert(onChanged != null),
-        super(key: key);
-
-  static const int maxStars = 5;
-  final int rating;
-  final ValueChanged<int> onChanged;
-
-  @override
-  Widget build(BuildContext context) {
-    return Row(
-      mainAxisAlignment: MainAxisAlignment.center,
-      children: List.generate(maxStars, (index) {
-        return IconButton(
-          icon: const Icon(Icons.star),
-          iconSize: 40.0,
-          color: rating > index ? Colors.amber : Colors.grey[400],
-          onPressed: () {
-            onChanged(index + 1);
-          },
-        );
-      }).toList(),
-    );
-  }
-}
-
 class _Map extends StatelessWidget {
+  final LatLng center;
+
+  final GoogleMapController mapController;
+  final ArgumentCallback<GoogleMapController> onMapCreated;
+  final Set<Marker> markers;
   const _Map({
     @required this.center,
     @required this.mapController,
@@ -223,24 +164,19 @@ class _Map extends StatelessWidget {
         assert(onMapCreated != null),
         super(key: key);
 
-  final LatLng center;
-  final GoogleMapController mapController;
-  final ArgumentCallback<GoogleMapController> onMapCreated;
-  final Set<Marker> markers;
-
   @override
   Widget build(BuildContext context) {
     return Card(
       margin: const EdgeInsets.symmetric(vertical: 16.0),
-      elevation: 4.0,
+      elevation: 4,
       child: SizedBox(
-        width: 340.0,
-        height: 240.0,
+        width: 340,
+        height: 240,
         child: GoogleMap(
           onMapCreated: onMapCreated,
           initialCameraPosition: CameraPosition(
             target: center,
-            zoom: 16.0,
+            zoom: 16,
           ),
           markers: markers,
           zoomGesturesEnabled: false,
@@ -253,78 +189,55 @@ class _Map extends StatelessWidget {
   }
 }
 
+class _NameTextField extends StatelessWidget {
+  final TextEditingController controller;
+
+  final ValueChanged<String> onChanged;
+  const _NameTextField({
+    @required this.controller,
+    @required this.onChanged,
+    Key key,
+  })  : assert(controller != null),
+        assert(onChanged != null),
+        super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.fromLTRB(0, 0, 0, 16),
+      child: TextField(
+        decoration: const InputDecoration(
+          labelText: 'Name',
+          labelStyle: TextStyle(fontSize: 18),
+        ),
+        style: const TextStyle(fontSize: 20, color: Colors.black87),
+        autocorrect: true,
+        controller: controller,
+        onChanged: (value) {
+          onChanged(value);
+        },
+      ),
+    );
+  }
+}
+
 class _Reviews extends StatelessWidget {
   const _Reviews({
     Key key,
   }) : super(key: key);
 
-  Widget _buildSingleReview(String reviewText) {
-    return Column(
-      children: <Widget>[
-        Padding(
-          padding: const EdgeInsets.symmetric(vertical: 10.0),
-          child: Row(
-            children: <Widget>[
-              Container(
-                width: 80.0,
-                height: 80.0,
-                decoration: BoxDecoration(
-                  borderRadius: BorderRadius.circular(40.0),
-                  border: Border.all(
-                    width: 3.0,
-                    color: Colors.grey,
-                  ),
-                ),
-                child: Row(
-                  mainAxisAlignment: MainAxisAlignment.center,
-                  children: const <Widget>[
-                    Text(
-                      '5',
-                      style: TextStyle(
-                        fontSize: 24.0,
-                        fontWeight: FontWeight.bold,
-                        color: Colors.black87,
-                      ),
-                    ),
-                    Icon(
-                      Icons.star,
-                      color: Colors.amber,
-                      size: 36.0,
-                    ),
-                  ],
-                ),
-              ),
-              const SizedBox(width: 16.0),
-              Expanded(
-                child: Text(
-                  reviewText,
-                  style: const TextStyle(fontSize: 20.0, color: Colors.black87),
-                  maxLines: null,
-                ),
-              ),
-            ],
-          ),
-        ),
-        Divider(
-          height: 8.0,
-          color: Colors.grey[700],
-        ),
-      ],
-    );
-  }
-
   @override
   Widget build(BuildContext context) {
     return Column(
-      children: <Widget>[
+      children: [
         const Padding(
-          padding: EdgeInsets.fromLTRB(0.0, 12.0, 0.0, 8.0),
+          padding: EdgeInsets.fromLTRB(0, 12, 0, 8),
           child: Align(
             alignment: Alignment.topLeft,
             child: Text(
               'Reviews',
               style: TextStyle(
-                fontSize: 24.0,
+                fontSize: 24,
                 fontWeight: FontWeight.bold,
                 decoration: TextDecoration.underline,
                 color: Colors.black87,
@@ -340,4 +253,90 @@ class _Reviews extends StatelessWidget {
       ],
     );
   }
+
+  Widget _buildSingleReview(String reviewText) {
+    return Column(
+      children: [
+        Padding(
+          padding: const EdgeInsets.symmetric(vertical: 10),
+          child: Row(
+            children: [
+              Container(
+                width: 80,
+                height: 80,
+                decoration: BoxDecoration(
+                  borderRadius: BorderRadius.circular(40),
+                  border: Border.all(
+                    width: 3,
+                    color: Colors.grey,
+                  ),
+                ),
+                child: Row(
+                  mainAxisAlignment: MainAxisAlignment.center,
+                  children: const [
+                    Text(
+                      '5',
+                      style: TextStyle(
+                        fontSize: 24,
+                        fontWeight: FontWeight.bold,
+                        color: Colors.black87,
+                      ),
+                    ),
+                    Icon(
+                      Icons.star,
+                      color: Colors.amber,
+                      size: 36,
+                    ),
+                  ],
+                ),
+              ),
+              const SizedBox(width: 16),
+              Expanded(
+                child: Text(
+                  reviewText,
+                  style: const TextStyle(fontSize: 20, color: Colors.black87),
+                  maxLines: null,
+                ),
+              ),
+            ],
+          ),
+        ),
+        Divider(
+          height: 8,
+          color: Colors.grey[700],
+        ),
+      ],
+    );
+  }
+}
+
+class _StarBar extends StatelessWidget {
+  static const int maxStars = 5;
+
+  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),
+        super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      mainAxisAlignment: MainAxisAlignment.center,
+      children: List.generate(maxStars, (index) {
+        return IconButton(
+          icon: const Icon(Icons.star),
+          iconSize: 40,
+          color: rating > index ? Colors.amber : Colors.grey[400],
+          onPressed: () {
+            onChanged(index + 1);
+          },
+        );
+      }).toList(),
+    );
+  }
 }