import 'package:flutter/material.dart'; import 'package:google_maps_flutter/google_maps_flutter.dart'; import 'package:provider/provider.dart'; import 'place.dart'; import 'place_list.dart'; import 'place_map.dart'; import 'stub_data.dart'; enum PlaceTrackerViewType { map, list, } class PlaceTrackerApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: _PlaceTrackerHomePage(), ); } } class _PlaceTrackerHomePage extends StatelessWidget { const _PlaceTrackerHomePage({Key key}) : super(key: key); @override Widget build(BuildContext context) { var state = Provider.of(context); return Scaffold( appBar: AppBar( title: Row( crossAxisAlignment: CrossAxisAlignment.center, children: const [ Padding( padding: EdgeInsets.fromLTRB(0.0, 0.0, 8.0, 0.0), child: Icon(Icons.pin_drop, size: 24.0), ), Text('Place Tracker'), ], ), backgroundColor: Colors.green[700], actions: [ Padding( padding: EdgeInsets.fromLTRB(0.0, 0.0, 16.0, 0.0), child: IconButton( icon: Icon( state.viewType == PlaceTrackerViewType.map ? Icons.list : Icons.map, size: 32.0, ), onPressed: () { state.setViewType( state.viewType == PlaceTrackerViewType.map ? PlaceTrackerViewType.list : PlaceTrackerViewType.map, ); }, ), ), ], ), body: IndexedStack( index: state.viewType == PlaceTrackerViewType.map ? 0 : 1, children: [ PlaceMap(center: const LatLng(45.521563, -122.677433)), PlaceList() ], ), ); } } class AppState extends ChangeNotifier { AppState({ this.places = StubData.places, this.selectedCategory = PlaceCategory.favorite, this.viewType = PlaceTrackerViewType.map, }) : assert(places != null), assert(selectedCategory != null); List places; PlaceCategory selectedCategory; PlaceTrackerViewType viewType; void setViewType(PlaceTrackerViewType viewType) { this.viewType = viewType; notifyListeners(); } void setSelectedCategory(PlaceCategory newCategory) { selectedCategory = newCategory; notifyListeners(); } void setPlaces(List newPlaces) { places = newPlaces; notifyListeners(); } @override bool operator ==(Object other) { if (identical(this, other)) return true; return other is AppState && other.places == places && other.selectedCategory == selectedCategory && other.viewType == viewType; } @override int get hashCode => hashValues(places, selectedCategory, viewType); }