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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.
This commit is contained in:
Kenzie Schmoll
GitHub
209
place_tracker/lib/place_list.dart
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209
place_tracker/lib/place_list.dart
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import 'package:flutter/material.dart';
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import 'place.dart';
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import 'place_details.dart';
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import 'place_tracker_app.dart';
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class PlaceList extends StatefulWidget {
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const PlaceList({ Key key }) : super(key: key);
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@override
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PlaceListState createState() => PlaceListState();
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}
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class PlaceListState extends State<PlaceList> {
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ScrollController _scrollController = ScrollController();
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void _onCategoryChanged(PlaceCategory newCategory) {
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_scrollController.jumpTo(0.0);
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AppState.updateWith(context, selectedCategory: newCategory);
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}
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void _onPlaceChanged(Place value) {
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// Replace the place with the modified version.
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final List<Place> newPlaces = List.from(AppState.of(context).places);
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final int index = newPlaces.indexWhere((Place place) => place.id == value.id);
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newPlaces[index] = value;
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AppState.updateWith(context, places: newPlaces);
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}
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@override
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Widget build(BuildContext context) {
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return Column(
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children: <Widget>[
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_ListCategoryButtonBar(
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selectedCategory: AppState.of(context).selectedCategory,
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onCategoryChanged: (value) => _onCategoryChanged(value),
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),
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Expanded(
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child: ListView(
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padding: const EdgeInsets.fromLTRB(16.0, 0.0, 16.0, 8.0),
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controller: _scrollController,
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shrinkWrap: true,
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children: AppState.of(context).places
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.where((Place place) => place.category == AppState.of(context).selectedCategory)
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.map((Place place) => _PlaceListTile(
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place: place,
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onPlaceChanged: (Place value) => _onPlaceChanged(value),
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)
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).toList(),
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),
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),
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]
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);
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}
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}
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class _PlaceListTile extends StatelessWidget {
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const _PlaceListTile({
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Key key,
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@required this.place,
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@required this.onPlaceChanged,
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}) : assert(place != null),
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assert(onPlaceChanged != null),
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super(key: key);
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final Place place;
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final ValueChanged<Place> onPlaceChanged;
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@override
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Widget build(BuildContext context) {
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return InkWell(
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onTap: () => Navigator.push(
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context,
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MaterialPageRoute(builder: (context) {
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return PlaceDetails(
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place: place,
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onChanged: (Place value) => onPlaceChanged(value),
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);
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}),
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),
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child: Container(
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padding: EdgeInsets.only(top: 16.0),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: <Widget>[
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Text(
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place.name,
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textAlign: TextAlign.left,
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style: TextStyle(
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fontWeight: FontWeight.bold,
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fontSize: 20.0,
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),
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maxLines: 3,
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),
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Row(
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children: List.generate(5, (int index) {
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return Icon(Icons.star,
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size: 28.0,
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color: place.starRating > index ? Colors.amber : Colors.grey[400],
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);
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}).toList(),
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),
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Text(
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place.description != null ? place.description : '',
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style: Theme.of(context).textTheme.subhead,
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maxLines: 4,
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overflow: TextOverflow.ellipsis,
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),
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SizedBox(height: 16.0),
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Divider(
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height: 2.0,
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color: Colors.grey[700],
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),
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],
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),
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),
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);
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}
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}
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class _ListCategoryButtonBar extends StatelessWidget {
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const _ListCategoryButtonBar({
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Key key,
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@required this.selectedCategory,
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@required this.onCategoryChanged,
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}) : assert(selectedCategory != null),
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assert(onCategoryChanged != null),
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super(key: key);
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final PlaceCategory selectedCategory;
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final ValueChanged<PlaceCategory> onCategoryChanged;
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@override
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Widget build(BuildContext context) {
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return Row(
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mainAxisAlignment: MainAxisAlignment.spaceEvenly,
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children: <Widget>[
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_CategoryButton(
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category: PlaceCategory.favorite,
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selected: selectedCategory == PlaceCategory.favorite,
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onCategoryChanged: onCategoryChanged,
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),_CategoryButton(
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category: PlaceCategory.visited,
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selected: selectedCategory == PlaceCategory.visited,
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onCategoryChanged: onCategoryChanged,
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),_CategoryButton(
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category: PlaceCategory.wantToGo,
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selected: selectedCategory == PlaceCategory.wantToGo,
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onCategoryChanged: onCategoryChanged,
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),
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],
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);
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}
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}
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class _CategoryButton extends StatelessWidget {
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const _CategoryButton({
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Key key,
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@required this.category,
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@required this.selected,
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@required this.onCategoryChanged,
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}) : assert(category != null),
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assert(selected != null),
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super(key: key);
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final PlaceCategory category;
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final bool selected;
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final ValueChanged<PlaceCategory> onCategoryChanged;
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@override
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Widget build(BuildContext context) {
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String _buttonText;
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switch (category) {
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case PlaceCategory.favorite:
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_buttonText = 'Favorites';
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break;
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case PlaceCategory.visited:
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_buttonText = 'Visited';
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break;
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case PlaceCategory.wantToGo:
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_buttonText = 'Want To Go';
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}
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return Container(
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margin: EdgeInsets.symmetric(vertical: 12.0),
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decoration: BoxDecoration(
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border: Border(
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bottom: BorderSide(
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color: selected ? Colors.blue : Colors.transparent,
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),
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),
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),
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child: ButtonTheme(
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height: 50.0,
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child: FlatButton(
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child: Text(
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_buttonText,
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style: TextStyle(
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fontSize: selected ? 20.0 : 18.0,
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color: selected ? Colors.blue : Colors.black87,
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),
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),
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onPressed: () => onCategoryChanged(category),
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),
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),
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);
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}
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}
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