import 'package:flutter/material.dart'; import 'package:provider/provider.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 { final ScrollController _scrollController = ScrollController(); void _onCategoryChanged(PlaceCategory newCategory) { _scrollController.jumpTo(0.0); Provider.of(context, listen: false) .setSelectedCategory(newCategory); } void _onPlaceChanged(Place value) { // Replace the place with the modified version. final newPlaces = List.from(Provider.of(context, listen: false).places); final index = newPlaces.indexWhere((place) => place.id == value.id); newPlaces[index] = value; Provider.of(context, listen: false).setPlaces(newPlaces); } @override Widget build(BuildContext context) { var state = Provider.of(context); return Column( children: [ _ListCategoryButtonBar( selectedCategory: state.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: state.places .where((place) => place.category == state.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 onPlaceChanged; @override Widget build(BuildContext context) { return InkWell( onTap: () => Navigator.push( 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: [ 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 onCategoryChanged; @override Widget build(BuildContext context) { return Row( mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: [ _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 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), ), ), ); } }