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samples/place_tracker/lib/place_tracker_app.dart

147 lines
3.9 KiB

import 'package:flutter/material.dart';
import 'package:google_maps_flutter/google_maps_flutter.dart';
import 'app_model.dart';
import 'place.dart';
import 'place_list.dart';
import 'place_map.dart';
import 'stub_data.dart';
enum PlaceTrackerViewType {
map,
list,
}
class PlaceTrackerApp extends StatefulWidget {
@override
_PlaceTrackerAppState createState() => _PlaceTrackerAppState();
}
class _PlaceTrackerAppState extends State<PlaceTrackerApp> {
AppState appState = AppState();
@override
Widget build(BuildContext context) {
return MaterialApp(
builder: (BuildContext context, Widget child) {
return AppModel<AppState>(
initialState: AppState(),
child: child,
);
},
home: _PlaceTrackerHomePage(),
);
}
}
class _PlaceTrackerHomePage extends StatelessWidget {
const _PlaceTrackerHomePage({ Key key }) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Row(
crossAxisAlignment: CrossAxisAlignment.center,
children: const <Widget>[
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: <Widget>[
Padding(
padding: EdgeInsets.fromLTRB(0.0, 0.0, 16.0, 0.0),
child: IconButton(
icon: Icon(
AppState.of(context).viewType == PlaceTrackerViewType.map
? Icons.list
: Icons.map,
size: 32.0
),
onPressed: () {
AppState.updateWith(
context,
viewType: AppState.of(context).viewType == PlaceTrackerViewType.map
? PlaceTrackerViewType.list
: PlaceTrackerViewType.map,
);
},
),
),
],
),
body: IndexedStack(
index: AppState.of(context).viewType == PlaceTrackerViewType.map ? 0 : 1,
children: <Widget>[
PlaceMap(center: const LatLng(45.521563, -122.677433)),
PlaceList(),
],
),
);
}
}
class AppState {
const AppState({
this.places = StubData.places,
this.selectedCategory = PlaceCategory.favorite,
this.viewType = PlaceTrackerViewType.map,
}) : assert(places != null),
assert(selectedCategory != null);
final List<Place> places;
final PlaceCategory selectedCategory;
final PlaceTrackerViewType viewType;
AppState copyWith({
List<Place> places,
PlaceCategory selectedCategory,
PlaceTrackerViewType viewType,
}) {
return AppState(
places: places ?? this.places,
selectedCategory: selectedCategory ?? this.selectedCategory,
viewType: viewType ?? this.viewType,
);
}
static AppState of(BuildContext context) => AppModel.of<AppState>(context);
static void update(BuildContext context, AppState newState) {
AppModel.update<AppState>(context, newState);
}
static void updateWith(
BuildContext context,
{List<Place> places,
PlaceCategory selectedCategory,
PlaceTrackerViewType viewType,
}) {
update(
context,
AppState.of(context).copyWith(
places: places, selectedCategory: selectedCategory, viewType: viewType,
),
);
}
@override
bool operator ==(Object other) {
if (identical(this, other))
return true;
if (other.runtimeType != runtimeType)
return false;
final AppState otherAppState = other;
return otherAppState.places == places
&& otherAppState.selectedCategory == selectedCategory
&& otherAppState.viewType == viewType;
}
@override
int get hashCode => hashValues(places, selectedCategory, viewType);
}