Starter/samples
1
0
Fork 0
mirror of https://github.com/flutter/samples.git synced 2026-04-02 09:43:05 +00:00
Code Issues Releases Wiki Activity

Place tracker/maintenance (#519)

Browse Source 
* 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
This commit is contained in:
John Ryan
2020-08-13 14:30:28 -07:00
committed by GitHub
parent 00d0cdf02c
commit 437d1f620b
12 changed files with 765 additions and 734 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
place_tracker/lib/place.dart
View File

@@ -1,13 +1,14 @@
import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
enum PlaceCategory {
favorite,
visited,
wantToGo,
}
class Place {
final String id;
final LatLng latLng;
final String name;
final PlaceCategory category;
final String description;
final int starRating;
const Place({
@required this.id,
@required this.latLng,
@@ -21,13 +22,6 @@ class Place {
assert(category != null),
assert(starRating != null && starRating >= 0 && starRating <= 5);
final String id;
final LatLng latLng;
final String name;
final PlaceCategory category;
final String description;
final int starRating;
double get latitude => latLng.latitude;
double get longitude => latLng.longitude;
@@ -50,3 +44,9 @@ class Place {
);
}
}
enum PlaceCategory {
favorite,
visited,
wantToGo,
}

347
place_tracker/lib/place_details.dart
View File

@@ -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(),
);
}
}

240
place_tracker/lib/place_list.dart
View File

@@ -15,27 +15,11 @@ class PlaceList extends StatefulWidget {
class PlaceListState extends State<PlaceList> {
final ScrollController _scrollController = ScrollController();
void _onCategoryChanged(PlaceCategory newCategory) {
_scrollController.jumpTo(0.0);
Provider.of<AppState>(context, listen: false)
.setSelectedCategory(newCategory);
}
void _onPlaceChanged(Place value) {
// Replace the place with the modified version.
final newPlaces =
List<Place>.from(Provider.of<AppState>(context, listen: false).places);
final index = newPlaces.indexWhere((place) => place.id == value.id);
newPlaces[index] = value;
Provider.of<AppState>(context, listen: false).setPlaces(newPlaces);
}
@override
Widget build(BuildContext context) {
var state = Provider.of<AppState>(context);
return Column(
children: <Widget>[
children: [
_ListCategoryButtonBar(
selectedCategory: state.selectedCategory,
onCategoryChanged: (value) => _onCategoryChanged(value),
@@ -57,113 +41,29 @@ class PlaceListState extends State<PlaceList> {
],
);
}
}
class _PlaceListTile extends StatelessWidget {
const _PlaceListTile({
Key key,
@required this.place,
@required this.onPlaceChanged,
}) : assert(place != null),
assert(onPlaceChanged != null),
super(key: key);
final Place place;
final ValueChanged<Place> onPlaceChanged;
@override
Widget build(BuildContext context) {
return InkWell(
onTap: () => Navigator.push<void>(
context,
MaterialPageRoute(builder: (context) {
return PlaceDetails(
place: place,
onChanged: (value) => onPlaceChanged(value),
);
}),
),
child: Container(
padding: EdgeInsets.only(top: 16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
place.name,
textAlign: TextAlign.left,
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 20.0,
),
maxLines: 3,
),
Row(
children: List.generate(5, (index) {
return Icon(
Icons.star,
size: 28.0,
color: place.starRating > index
? Colors.amber
: Colors.grey[400],
);
}).toList(),
),
Text(
place.description ?? '',
style: Theme.of(context).textTheme.subtitle1,
maxLines: 4,
overflow: TextOverflow.ellipsis,
),
SizedBox(height: 16.0),
Divider(
height: 2.0,
color: Colors.grey[700],
),
],
),
),
);
void _onCategoryChanged(PlaceCategory newCategory) {
_scrollController.jumpTo(0.0);
Provider.of<AppState>(context, listen: false)
.setSelectedCategory(newCategory);
}
}
class _ListCategoryButtonBar extends StatelessWidget {
const _ListCategoryButtonBar({
Key key,
@required this.selectedCategory,
@required this.onCategoryChanged,
}) : assert(selectedCategory != null),
assert(onCategoryChanged != null),
super(key: key);
void _onPlaceChanged(Place value) {
// Replace the place with the modified version.
final newPlaces =
List<Place>.from(Provider.of<AppState>(context, listen: false).places);
final index = newPlaces.indexWhere((place) => place.id == value.id);
newPlaces[index] = value;
final PlaceCategory selectedCategory;
final ValueChanged<PlaceCategory> onCategoryChanged;
@override
Widget build(BuildContext context) {
return Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
_CategoryButton(
category: PlaceCategory.favorite,
selected: selectedCategory == PlaceCategory.favorite,
onCategoryChanged: onCategoryChanged,
),
_CategoryButton(
category: PlaceCategory.visited,
selected: selectedCategory == PlaceCategory.visited,
onCategoryChanged: onCategoryChanged,
),
_CategoryButton(
category: PlaceCategory.wantToGo,
selected: selectedCategory == PlaceCategory.wantToGo,
onCategoryChanged: onCategoryChanged,
),
],
);
Provider.of<AppState>(context, listen: false).setPlaces(newPlaces);
}
}
class _CategoryButton extends StatelessWidget {
final PlaceCategory category;
final bool selected;
final ValueChanged<PlaceCategory> onCategoryChanged;
const _CategoryButton({
Key key,
@required this.category,
@@ -173,10 +73,6 @@ class _CategoryButton extends StatelessWidget {
assert(selected != null),
super(key: key);
final PlaceCategory category;
final bool selected;
final ValueChanged<PlaceCategory> onCategoryChanged;
@override
Widget build(BuildContext context) {
String _buttonText;
@@ -216,3 +112,107 @@ class _CategoryButton extends StatelessWidget {
);
}
}
class _ListCategoryButtonBar extends StatelessWidget {
final PlaceCategory selectedCategory;
final ValueChanged<PlaceCategory> onCategoryChanged;
const _ListCategoryButtonBar({
Key key,
@required this.selectedCategory,
@required this.onCategoryChanged,
}) : assert(selectedCategory != null),
assert(onCategoryChanged != null),
super(key: key);
@override
Widget build(BuildContext context) {
return Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
_CategoryButton(
category: PlaceCategory.favorite,
selected: selectedCategory == PlaceCategory.favorite,
onCategoryChanged: onCategoryChanged,
),
_CategoryButton(
category: PlaceCategory.visited,
selected: selectedCategory == PlaceCategory.visited,
onCategoryChanged: onCategoryChanged,
),
_CategoryButton(
category: PlaceCategory.wantToGo,
selected: selectedCategory == PlaceCategory.wantToGo,
onCategoryChanged: onCategoryChanged,
),
],
);
}
}
class _PlaceListTile extends StatelessWidget {
final Place place;
final ValueChanged<Place> onPlaceChanged;
const _PlaceListTile({
Key key,
@required this.place,
@required this.onPlaceChanged,
}) : assert(place != null),
assert(onPlaceChanged != null),
super(key: key);
@override
Widget build(BuildContext context) {
return InkWell(
onTap: () => Navigator.push<void>(
context,
MaterialPageRoute(builder: (context) {
return PlaceDetails(
place: place,
onChanged: (value) => onPlaceChanged(value),
);
}),
),
child: Container(
padding: EdgeInsets.only(top: 16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
place.name,
textAlign: TextAlign.left,
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 20.0,
),
maxLines: 3,
),
Row(
children: List.generate(5, (index) {
return Icon(
Icons.star,
size: 28.0,
color: place.starRating > index
? Colors.amber
: Colors.grey[400],
);
}).toList(),
),
Text(
place.description ?? '',
style: Theme.of(context).textTheme.subtitle1,
maxLines: 4,
overflow: TextOverflow.ellipsis,
),
SizedBox(height: 16.0),
Divider(
height: 2.0,
color: Colors.grey[700],
),
],
),
),
);
}
}

652
place_tracker/lib/place_map.dart
View File

@@ -11,41 +11,55 @@ import 'place.dart';
import 'place_details.dart';
import 'place_tracker_app.dart';
class MapConfiguration {
final List<Place> places;
final PlaceCategory selectedCategory;
const MapConfiguration({
@required this.places,
@required this.selectedCategory,
}) : assert(places != null),
assert(selectedCategory != null);
@override
int get hashCode => places.hashCode ^ selectedCategory.hashCode;
@override
bool operator ==(Object other) {
if (identical(this, other)) {
return true;
}
if (other.runtimeType != runtimeType) {
return false;
}
return other is MapConfiguration &&
other.places == places &&
other.selectedCategory == selectedCategory;
}
static MapConfiguration of(AppState appState) {
return MapConfiguration(
places: appState.places,
selectedCategory: appState.selectedCategory,
);
}
}
class PlaceMap extends StatefulWidget {
final LatLng center;
const PlaceMap({
Key key,
this.center,
}) : super(key: key);
final LatLng center;
@override
PlaceMapState createState() => PlaceMapState();
}
class PlaceMapState extends State<PlaceMap> {
static Future<BitmapDescriptor> _getPlaceMarkerIcon(
BuildContext context, PlaceCategory category) async {
switch (category) {
case PlaceCategory.favorite:
return BitmapDescriptor.fromAssetImage(
createLocalImageConfiguration(context), 'assets/heart.png');
break;
case PlaceCategory.visited:
return BitmapDescriptor.fromAssetImage(
createLocalImageConfiguration(context), 'assets/visited.png');
break;
case PlaceCategory.wantToGo:
default:
return BitmapDescriptor.defaultMarker;
}
}
static List<Place> _getPlacesForCategory(
PlaceCategory category, List<Place> places) {
return places.where((place) => place.category == category).toList();
}
Completer<GoogleMapController> mapController = Completer();
MapType _currentMapType = MapType.normal;
@@ -60,6 +74,50 @@ class PlaceMapState extends State<PlaceMap> {
MapConfiguration _configuration;
@override
Widget build(BuildContext context) {
_maybeUpdateMapConfiguration();
var state = Provider.of<AppState>(context);
return Builder(builder: (context) {
// We need this additional builder here so that we can pass its context to
// _AddPlaceButtonBar's onSavePressed callback. This callback shows a
// SnackBar and to do this, we need a build context that has Scaffold as
// an ancestor.
return Center(
child: Stack(
children: [
GoogleMap(
onMapCreated: onMapCreated,
initialCameraPosition: CameraPosition(
target: widget.center,
zoom: 11.0,
),
mapType: _currentMapType,
markers: _markers,
onCameraMove: (position) => _lastMapPosition = position.target,
),
_CategoryButtonBar(
selectedPlaceCategory: state.selectedCategory,
visible: _pendingMarker == null,
onChanged: _switchSelectedCategory,
),
_AddPlaceButtonBar(
visible: _pendingMarker != null,
onSavePressed: () => _confirmAddPlace(context),
onCancelPressed: _cancelAddPlace,
),
_MapFabs(
visible: _pendingMarker == null,
onAddPlacePressed: _onAddPlacePressed,
onToggleMapTypePressed: _onToggleMapTypePressed,
),
],
),
);
});
}
Future<void> onMapCreated(GoogleMapController controller) async {
mapController.complete(controller);
_lastMapPosition = widget.center;
@@ -83,152 +141,13 @@ class PlaceMapState extends State<PlaceMap> {
);
}
Future<Marker> _createPlaceMarker(BuildContext context, Place place) async {
final marker = Marker(
markerId: MarkerId(place.latLng.toString()),
position: place.latLng,
infoWindow: InfoWindow(
title: place.name,
snippet: '${place.starRating} Star Rating',
onTap: () => _pushPlaceDetailsScreen(place),
),
icon: await _getPlaceMarkerIcon(context, place.category),
visible: place.category ==
Provider.of<AppState>(context, listen: false).selectedCategory,
);
_markedPlaces[marker] = place;
return marker;
}
void _pushPlaceDetailsScreen(Place place) {
assert(place != null);
Navigator.push<void>(
context,
MaterialPageRoute(builder: (context) {
return PlaceDetails(
place: place,
onChanged: (value) => _onPlaceChanged(value),
);
}),
);
}
void _onPlaceChanged(Place value) {
// Replace the place with the modified version.
final newPlaces =
List<Place>.from(Provider.of<AppState>(context, listen: false).places);
final index = newPlaces.indexWhere((place) => place.id == value.id);
newPlaces[index] = value;
_updateExistingPlaceMarker(place: value);
// Manually update our map configuration here since our map is already
// updated with the new marker. Otherwise, the map would be reconfigured
// in the main build method due to a modified AppState.
_configuration = MapConfiguration(
places: newPlaces,
selectedCategory:
Provider.of<AppState>(context, listen: false).selectedCategory,
);
Provider.of<AppState>(context, listen: false).setPlaces(newPlaces);
}
void _updateExistingPlaceMarker({@required Place place}) {
var marker = _markedPlaces.keys
.singleWhere((value) => _markedPlaces[value].id == place.id);
setState(() {
final updatedMarker = marker.copyWith(
infoWindowParam: InfoWindow(
title: place.name,
snippet:
place.starRating != 0 ? '${place.starRating} Star Rating' : null,
),
);
_updateMarker(marker: marker, updatedMarker: updatedMarker, place: place);
});
}
void _updateMarker({
@required Marker marker,
@required Marker updatedMarker,
@required Place place,
}) {
_markers.remove(marker);
_markedPlaces.remove(marker);
_markers.add(updatedMarker);
_markedPlaces[updatedMarker] = place;
}
Future<void> _switchSelectedCategory(PlaceCategory category) async {
Provider.of<AppState>(context, listen: false).setSelectedCategory(category);
await _showPlacesForSelectedCategory(category);
}
Future<void> _showPlacesForSelectedCategory(PlaceCategory category) async {
setState(() {
for (var marker in List.of(_markedPlaces.keys)) {
final place = _markedPlaces[marker];
final updatedMarker = marker.copyWith(
visibleParam: place.category == category,
);
_updateMarker(
marker: marker,
updatedMarker: updatedMarker,
place: place,
);
}
});
await _zoomToFitPlaces(_getPlacesForCategory(
category,
_markedPlaces.values.toList(),
));
}
Future<void> _zoomToFitPlaces(List<Place> places) async {
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;
for (var place in places) {
minLat = min(minLat, place.latitude);
maxLat = max(maxLat, place.latitude);
minLong = min(minLong, place.longitude);
maxLong = max(maxLong, place.longitude);
void _cancelAddPlace() {
if (_pendingMarker != null) {
setState(() {
_markers.remove(_pendingMarker);
_pendingMarker = null;
});
}
await controller.animateCamera(
CameraUpdate.newLatLngBounds(
LatLngBounds(
southwest: LatLng(minLat, minLong),
northeast: LatLng(maxLat, maxLong),
),
48.0,
),
);
}
Future<void> _onAddPlacePressed() async {
setState(() {
final newMarker = Marker(
markerId: MarkerId(_lastMapPosition.toString()),
position: _lastMapPosition,
infoWindow: InfoWindow(title: 'New Place'),
draggable: true,
icon: BitmapDescriptor.defaultMarkerWithHue(BitmapDescriptor.hueGreen),
);
_markers.add(newMarker);
_pendingMarker = newMarker;
});
}
Future<void> _confirmAddPlace(BuildContext context) async {
@@ -298,22 +217,21 @@ class PlaceMapState extends State<PlaceMap> {
}
}
void _cancelAddPlace() {
if (_pendingMarker != null) {
setState(() {
_markers.remove(_pendingMarker);
_pendingMarker = null;
});
}
}
void _onToggleMapTypePressed() {
final nextType =
MapType.values[(_currentMapType.index + 1) % MapType.values.length];
setState(() {
_currentMapType = nextType;
});
Future<Marker> _createPlaceMarker(BuildContext context, Place place) async {
final marker = Marker(
markerId: MarkerId(place.latLng.toString()),
position: place.latLng,
infoWindow: InfoWindow(
title: place.name,
snippet: '${place.starRating} Star Rating',
onTap: () => _pushPlaceDetailsScreen(place),
),
icon: await _getPlaceMarkerIcon(context, place.category),
visible: place.category ==
Provider.of<AppState>(context, listen: false).selectedCategory,
);
_markedPlaces[marker] = place;
return marker;
}
Future<void> _maybeUpdateMapConfiguration() async {
@@ -351,65 +269,183 @@ class PlaceMapState extends State<PlaceMap> {
}
}
@override
Widget build(BuildContext context) {
_maybeUpdateMapConfiguration();
var state = Provider.of<AppState>(context);
Future<void> _onAddPlacePressed() async {
setState(() {
final newMarker = Marker(
markerId: MarkerId(_lastMapPosition.toString()),
position: _lastMapPosition,
infoWindow: InfoWindow(title: 'New Place'),
draggable: true,
icon: BitmapDescriptor.defaultMarkerWithHue(BitmapDescriptor.hueGreen),
);
_markers.add(newMarker);
_pendingMarker = newMarker;
});
}
return Builder(builder: (context) {
// We need this additional builder here so that we can pass its context to
// _AddPlaceButtonBar's onSavePressed callback. This callback shows a
// SnackBar and to do this, we need a build context that has Scaffold as
// an ancestor.
return Center(
child: Stack(
children: <Widget>[
GoogleMap(
onMapCreated: onMapCreated,
initialCameraPosition: CameraPosition(
target: widget.center,
zoom: 11.0,
),
mapType: _currentMapType,
markers: _markers,
onCameraMove: (position) => _lastMapPosition = position.target,
),
_CategoryButtonBar(
selectedPlaceCategory: state.selectedCategory,
visible: _pendingMarker == null,
onChanged: _switchSelectedCategory,
),
_AddPlaceButtonBar(
visible: _pendingMarker != null,
onSavePressed: () => _confirmAddPlace(context),
onCancelPressed: _cancelAddPlace,
),
_MapFabs(
visible: _pendingMarker == null,
onAddPlacePressed: _onAddPlacePressed,
onToggleMapTypePressed: _onToggleMapTypePressed,
),
],
void _onPlaceChanged(Place value) {
// Replace the place with the modified version.
final newPlaces =
List<Place>.from(Provider.of<AppState>(context, listen: false).places);
final index = newPlaces.indexWhere((place) => place.id == value.id);
newPlaces[index] = value;
_updateExistingPlaceMarker(place: value);
// Manually update our map configuration here since our map is already
// updated with the new marker. Otherwise, the map would be reconfigured
// in the main build method due to a modified AppState.
_configuration = MapConfiguration(
places: newPlaces,
selectedCategory:
Provider.of<AppState>(context, listen: false).selectedCategory,
);
Provider.of<AppState>(context, listen: false).setPlaces(newPlaces);
}
void _onToggleMapTypePressed() {
final nextType =
MapType.values[(_currentMapType.index + 1) % MapType.values.length];
setState(() {
_currentMapType = nextType;
});
}
void _pushPlaceDetailsScreen(Place place) {
assert(place != null);
Navigator.push<void>(
context,
MaterialPageRoute(builder: (context) {
return PlaceDetails(
place: place,
onChanged: (value) => _onPlaceChanged(value),
);
}),
);
}
Future<void> _showPlacesForSelectedCategory(PlaceCategory category) async {
setState(() {
for (var marker in List.of(_markedPlaces.keys)) {
final place = _markedPlaces[marker];
final updatedMarker = marker.copyWith(
visibleParam: place.category == category,
);
_updateMarker(
marker: marker,
updatedMarker: updatedMarker,
place: place,
);
}
});
await _zoomToFitPlaces(_getPlacesForCategory(
category,
_markedPlaces.values.toList(),
));
}
Future<void> _switchSelectedCategory(PlaceCategory category) async {
Provider.of<AppState>(context, listen: false).setSelectedCategory(category);
await _showPlacesForSelectedCategory(category);
}
void _updateExistingPlaceMarker({@required Place place}) {
var marker = _markedPlaces.keys
.singleWhere((value) => _markedPlaces[value].id == place.id);
setState(() {
final updatedMarker = marker.copyWith(
infoWindowParam: InfoWindow(
title: place.name,
snippet:
place.starRating != 0 ? '${place.starRating} Star Rating' : null,
),
);
_updateMarker(marker: marker, updatedMarker: updatedMarker, place: place);
});
}
void _updateMarker({
@required Marker marker,
@required Marker updatedMarker,
@required Place place,
}) {
_markers.remove(marker);
_markedPlaces.remove(marker);
_markers.add(updatedMarker);
_markedPlaces[updatedMarker] = place;
}
Future<void> _zoomToFitPlaces(List<Place> places) async {
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;
for (var place in places) {
minLat = min(minLat, place.latitude);
maxLat = max(maxLat, place.latitude);
minLong = min(minLong, place.longitude);
maxLong = max(maxLong, place.longitude);
}
await controller.animateCamera(
CameraUpdate.newLatLngBounds(
LatLngBounds(
southwest: LatLng(minLat, minLong),
northeast: LatLng(maxLat, maxLong),
),
48.0,
),
);
}
static Future<BitmapDescriptor> _getPlaceMarkerIcon(
BuildContext context, PlaceCategory category) async {
switch (category) {
case PlaceCategory.favorite:
return BitmapDescriptor.fromAssetImage(
createLocalImageConfiguration(context), 'assets/heart.png');
break;
case PlaceCategory.visited:
return BitmapDescriptor.fromAssetImage(
createLocalImageConfiguration(context), 'assets/visited.png');
break;
case PlaceCategory.wantToGo:
default:
return BitmapDescriptor.defaultMarker;
}
}
static List<Place> _getPlacesForCategory(
PlaceCategory category, List<Place> places) {
return places.where((place) => place.category == category).toList();
}
}
class _CategoryButtonBar extends StatelessWidget {
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);
final PlaceCategory selectedPlaceCategory;
class _AddPlaceButtonBar extends StatelessWidget {
final bool visible;
final ValueChanged<PlaceCategory> onChanged;
final VoidCallback onSavePressed;
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);
@override
Widget build(BuildContext context) {
@@ -420,7 +456,55 @@ class _CategoryButtonBar extends StatelessWidget {
alignment: Alignment.bottomCenter,
child: ButtonBar(
alignment: MainAxisAlignment.center,
children: <Widget>[
children: [
RaisedButton(
color: Colors.blue,
child: const Text(
'Save',
style: TextStyle(color: Colors.white, fontSize: 16.0),
),
onPressed: onSavePressed,
),
RaisedButton(
color: Colors.red,
child: const Text(
'Cancel',
style: TextStyle(color: Colors.white, fontSize: 16.0),
),
onPressed: onCancelPressed,
),
],
),
),
);
}
}
class _CategoryButtonBar extends StatelessWidget {
final PlaceCategory selectedPlaceCategory;
final bool visible;
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);
@override
Widget build(BuildContext context) {
return Visibility(
visible: visible,
child: Container(
padding: const EdgeInsets.fromLTRB(0.0, 0.0, 0.0, 14.0),
alignment: Alignment.bottomCenter,
child: ButtonBar(
alignment: MainAxisAlignment.center,
children: [
RaisedButton(
color: selectedPlaceCategory == PlaceCategory.favorite
? Colors.green[700]
@@ -458,55 +542,11 @@ class _CategoryButtonBar extends StatelessWidget {
}
}
class _AddPlaceButtonBar extends StatelessWidget {
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);
final bool visible;
final VoidCallback onSavePressed;
final VoidCallback onCancelPressed;
@override
Widget build(BuildContext context) {
return Visibility(
visible: visible,
child: Container(
padding: const EdgeInsets.fromLTRB(0.0, 0.0, 0.0, 14.0),
alignment: Alignment.bottomCenter,
child: ButtonBar(
alignment: MainAxisAlignment.center,
children: <Widget>[
RaisedButton(
color: Colors.blue,
child: const Text(
'Save',
style: TextStyle(color: Colors.white, fontSize: 16.0),
),
onPressed: onSavePressed,
),
RaisedButton(
color: Colors.red,
child: const Text(
'Cancel',
style: TextStyle(color: Colors.white, fontSize: 16.0),
),
onPressed: onCancelPressed,
),
],
),
),
);
}
}
class _MapFabs extends StatelessWidget {
final bool visible;
final VoidCallback onAddPlacePressed;
final VoidCallback onToggleMapTypePressed;
const _MapFabs({
Key key,
@required this.visible,
@@ -517,10 +557,6 @@ class _MapFabs extends StatelessWidget {
assert(onToggleMapTypePressed != null),
super(key: key);
final bool visible;
final VoidCallback onAddPlacePressed;
final VoidCallback onToggleMapTypePressed;
@override
Widget build(BuildContext context) {
return Container(
@@ -529,7 +565,7 @@ class _MapFabs extends StatelessWidget {
child: Visibility(
visible: visible,
child: Column(
children: <Widget>[
children: [
FloatingActionButton(
heroTag: 'add_place_button',
onPressed: onAddPlacePressed,
@@ -552,39 +588,3 @@ class _MapFabs extends StatelessWidget {
);
}
}
class MapConfiguration {
const MapConfiguration({
@required this.places,
@required this.selectedCategory,
}) : assert(places != null),
assert(selectedCategory != null);
final List<Place> places;
final PlaceCategory selectedCategory;
@override
int get hashCode => places.hashCode ^ selectedCategory.hashCode;
@override
bool operator ==(Object other) {
if (identical(this, other)) {
return true;
}
if (other.runtimeType != runtimeType) {
return false;
}
return other is MapConfiguration &&
other.places == places &&
other.selectedCategory == selectedCategory;
}
static MapConfiguration of(AppState appState) {
return MapConfiguration(
places: appState.places,
selectedCategory: appState.selectedCategory,
);
}
}

7
place_tracker/lib/place_tracker_app.dart
View File

@@ -31,7 +31,7 @@ class _PlaceTrackerHomePage extends StatelessWidget {
appBar: AppBar(
title: Row(
crossAxisAlignment: CrossAxisAlignment.center,
children: const <Widget>[
children: const [
Padding(
padding: EdgeInsets.fromLTRB(0.0, 0.0, 8.0, 0.0),
child: Icon(Icons.pin_drop, size: 24.0),
@@ -40,7 +40,7 @@ class _PlaceTrackerHomePage extends StatelessWidget {
],
),
backgroundColor: Colors.green[700],
actions: <Widget>[
actions: [
Padding(
padding: EdgeInsets.fromLTRB(0.0, 0.0, 16.0, 0.0),
child: IconButton(
@@ -63,7 +63,7 @@ class _PlaceTrackerHomePage extends StatelessWidget {
),
body: IndexedStack(
index: state.viewType == PlaceTrackerViewType.map ? 0 : 1,
children: <Widget>[
children: [
PlaceMap(center: const LatLng(45.521563, -122.677433)),
PlaceList()
],
@@ -102,7 +102,6 @@ class AppState extends ChangeNotifier {
@override
bool operator ==(Object other) {
if (identical(this, other)) return true;
if (other.runtimeType != runtimeType) return false;
return other is AppState &&
other.places == places &&
other.selectedCategory == selectedCategory &&

2
place_tracker/lib/stub_data.dart
View File

@@ -141,7 +141,7 @@ class StubData {
),
];
static const List<String> reviewStrings = [
static const reviewStrings = <String>[
'My favorite place in Portland. The employees are wonderful and so is the food. I go here at least once a month!',
'Staff was very friendly. Great atmosphere and good music. Would reccommend.',
'Best. Place. In. Town. Period.'