mirror of https://github.com/flutter/samples.git
Add a list view to the place tracker app. (#30)
* Add list view to place tracker. Note: map in listTile is not WAI in this commit. * Remove map from list tiles. Make list tiles tappable (currently editing a place and saving will do nothing if the details screen is pushed from the list view. * Fix text alignment in list. * Initial implementation of using an InheritedWidget to maintain data between list and map. Map does not update correctly at this point. * Use AppModel.update to set the AppState. Add MapConfiguration class to handle map changes based on AppState. * Don't cache AppState - lookup directly. Extract AppState code into it's own file and add static methods. Address comments from Hans. * Extract generic AppModel code.pull/33/head
parent
e59c865884
commit
79d9d143b4
@ -0,0 +1,68 @@
|
||||
import 'package:flutter/material.dart';
|
||||
|
||||
class _AppModelScope<T> extends InheritedWidget {
|
||||
const _AppModelScope({
|
||||
Key key,
|
||||
this.appModelState,
|
||||
Widget child
|
||||
}) : super(key: key, child: child);
|
||||
|
||||
final _AppModelState<T> appModelState;
|
||||
|
||||
@override
|
||||
bool updateShouldNotify(_AppModelScope oldWidget) => true;
|
||||
}
|
||||
|
||||
class AppModel<T> extends StatefulWidget {
|
||||
AppModel({
|
||||
Key key,
|
||||
@required this.initialState,
|
||||
this.child,
|
||||
}) : assert(initialState != null),
|
||||
super(key: key);
|
||||
|
||||
final T initialState;
|
||||
final Widget child;
|
||||
|
||||
_AppModelState<T> createState() => _AppModelState<T>();
|
||||
|
||||
static _typeOf<T>() => T;
|
||||
|
||||
static T of<T>(BuildContext context) {
|
||||
final Type appModelScopeType = _typeOf<_AppModelScope<T>>();
|
||||
final _AppModelScope<T> scope = context.inheritFromWidgetOfExactType(appModelScopeType);
|
||||
return scope.appModelState.currentState;
|
||||
}
|
||||
|
||||
static void update<T>(BuildContext context, T newState) {
|
||||
final Type appModelScopeType = _typeOf<_AppModelScope<T>>();
|
||||
final _AppModelScope<T> scope = context.inheritFromWidgetOfExactType(appModelScopeType);
|
||||
scope.appModelState.updateState(newState);
|
||||
}
|
||||
}
|
||||
|
||||
class _AppModelState<T> extends State<AppModel<T>> {
|
||||
@override
|
||||
void initState() {
|
||||
super.initState();
|
||||
currentState = widget.initialState;
|
||||
}
|
||||
|
||||
T currentState;
|
||||
|
||||
void updateState(T newState) {
|
||||
if (newState != currentState) {
|
||||
setState(() {
|
||||
currentState = newState;
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
@override
|
||||
Widget build(BuildContext context) {
|
||||
return _AppModelScope<T>(
|
||||
appModelState: this,
|
||||
child: widget.child,
|
||||
);
|
||||
}
|
||||
}
|
@ -1,24 +1,7 @@
|
||||
import 'package:flutter/material.dart';
|
||||
import 'place_map.dart';
|
||||
import 'package:google_maps_flutter/google_maps_flutter.dart';
|
||||
|
||||
class _Home extends StatelessWidget {
|
||||
const _Home({ Key key }) : super(key: key);
|
||||
|
||||
@override
|
||||
Widget build(BuildContext context) {
|
||||
return PlaceMap(
|
||||
center: const LatLng(45.521563, -122.677433),
|
||||
);
|
||||
}
|
||||
}
|
||||
import 'place_tracker_app.dart';
|
||||
|
||||
void main() {
|
||||
runApp(
|
||||
MaterialApp(
|
||||
debugShowCheckedModeBanner: false,
|
||||
title: 'Place Tracker',
|
||||
home: _Home(),
|
||||
)
|
||||
);
|
||||
runApp(PlaceTrackerApp());
|
||||
}
|
||||
|
@ -0,0 +1,209 @@
|
||||
import 'package:flutter/material.dart';
|
||||
|
||||
import 'place.dart';
|
||||
import 'place_details.dart';
|
||||
import 'place_tracker_app.dart';
|
||||
|
||||
class PlaceList extends StatefulWidget {
|
||||
const PlaceList({ Key key }) : super(key: key);
|
||||
|
||||
@override
|
||||
PlaceListState createState() => PlaceListState();
|
||||
}
|
||||
|
||||
class PlaceListState extends State<PlaceList> {
|
||||
ScrollController _scrollController = ScrollController();
|
||||
|
||||
void _onCategoryChanged(PlaceCategory newCategory) {
|
||||
_scrollController.jumpTo(0.0);
|
||||
AppState.updateWith(context, selectedCategory: newCategory);
|
||||
}
|
||||
|
||||
void _onPlaceChanged(Place value) {
|
||||
// Replace the place with the modified version.
|
||||
final List<Place> newPlaces = List.from(AppState.of(context).places);
|
||||
final int index = newPlaces.indexWhere((Place place) => place.id == value.id);
|
||||
newPlaces[index] = value;
|
||||
|
||||
AppState.updateWith(context, places: newPlaces);
|
||||
}
|
||||
|
||||
@override
|
||||
Widget build(BuildContext context) {
|
||||
return Column(
|
||||
children: <Widget>[
|
||||
_ListCategoryButtonBar(
|
||||
selectedCategory: AppState.of(context).selectedCategory,
|
||||
onCategoryChanged: (value) => _onCategoryChanged(value),
|
||||
),
|
||||
Expanded(
|
||||
child: ListView(
|
||||
padding: const EdgeInsets.fromLTRB(16.0, 0.0, 16.0, 8.0),
|
||||
controller: _scrollController,
|
||||
shrinkWrap: true,
|
||||
children: AppState.of(context).places
|
||||
.where((Place place) => place.category == AppState.of(context).selectedCategory)
|
||||
.map((Place place) => _PlaceListTile(
|
||||
place: place,
|
||||
onPlaceChanged: (Place value) => _onPlaceChanged(value),
|
||||
)
|
||||
).toList(),
|
||||
),
|
||||
),
|
||||
]
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
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(
|
||||
context,
|
||||
MaterialPageRoute(builder: (context) {
|
||||
return PlaceDetails(
|
||||
place: place,
|
||||
onChanged: (Place 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, (int index) {
|
||||
return Icon(Icons.star,
|
||||
size: 28.0,
|
||||
color: place.starRating > index ? Colors.amber : Colors.grey[400],
|
||||
);
|
||||
}).toList(),
|
||||
),
|
||||
Text(
|
||||
place.description != null ? place.description : '',
|
||||
style: Theme.of(context).textTheme.subhead,
|
||||
maxLines: 4,
|
||||
overflow: TextOverflow.ellipsis,
|
||||
),
|
||||
SizedBox(height: 16.0),
|
||||
Divider(
|
||||
height: 2.0,
|
||||
color: Colors.grey[700],
|
||||
),
|
||||
],
|
||||
),
|
||||
),
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
class _ListCategoryButtonBar extends StatelessWidget {
|
||||
const _ListCategoryButtonBar({
|
||||
Key key,
|
||||
@required this.selectedCategory,
|
||||
@required this.onCategoryChanged,
|
||||
}) : assert(selectedCategory != null),
|
||||
assert(onCategoryChanged != null),
|
||||
super(key: key);
|
||||
|
||||
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,
|
||||
),
|
||||
],
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
class _CategoryButton extends StatelessWidget {
|
||||
const _CategoryButton({
|
||||
Key key,
|
||||
@required this.category,
|
||||
@required this.selected,
|
||||
@required this.onCategoryChanged,
|
||||
}) : assert(category != null),
|
||||
assert(selected != null),
|
||||
super(key: key);
|
||||
|
||||
final PlaceCategory category;
|
||||
final bool selected;
|
||||
final ValueChanged<PlaceCategory> onCategoryChanged;
|
||||
|
||||
@override
|
||||
Widget build(BuildContext context) {
|
||||
String _buttonText;
|
||||
switch (category) {
|
||||
case PlaceCategory.favorite:
|
||||
_buttonText = 'Favorites';
|
||||
break;
|
||||
case PlaceCategory.visited:
|
||||
_buttonText = 'Visited';
|
||||
break;
|
||||
case PlaceCategory.wantToGo:
|
||||
_buttonText = 'Want To Go';
|
||||
}
|
||||
|
||||
return Container(
|
||||
margin: EdgeInsets.symmetric(vertical: 12.0),
|
||||
decoration: BoxDecoration(
|
||||
border: Border(
|
||||
bottom: BorderSide(
|
||||
color: selected ? Colors.blue : Colors.transparent,
|
||||
),
|
||||
),
|
||||
),
|
||||
child: ButtonTheme(
|
||||
height: 50.0,
|
||||
child: FlatButton(
|
||||
child: Text(
|
||||
_buttonText,
|
||||
style: TextStyle(
|
||||
fontSize: selected ? 20.0 : 18.0,
|
||||
color: selected ? Colors.blue : Colors.black87,
|
||||
),
|
||||
),
|
||||
onPressed: () => onCategoryChanged(category),
|
||||
),
|
||||
),
|
||||
);
|
||||
}
|
||||
}
|
@ -0,0 +1,146 @@
|
||||
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);
|
||||
}
|
Loading…
Reference in new issue