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samples/place_tracker/lib/place_tracker_app.dart

118 lines
3.1 KiB

// Copyright 2020 The Flutter team. All rights reserved.
// 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';
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<AppState>(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<Place> places;
PlaceCategory selectedCategory;
PlaceTrackerViewType viewType;
void setViewType(PlaceTrackerViewType viewType) {
this.viewType = viewType;
notifyListeners();
}
void setSelectedCategory(PlaceCategory newCategory) {
selectedCategory = newCategory;
notifyListeners();
}
void setPlaces(List<Place> 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);
}