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samples/place_tracker/lib/place_list.dart

217 lines
5.9 KiB

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> {
final 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 newPlaces = List<Place>.from(AppState.of(context).places);
final index = newPlaces.indexWhere((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.category == AppState.of(context).selectedCategory)
.map((place) => _PlaceListTile(
place: place,
onPlaceChanged: (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<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],
),
],
),
),
);
}
}
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),
),
),
);
}
}