Starter/samples
1
0
Fork 0
mirror of https://github.com/flutter/samples.git synced 2026-05-21 22:48:02 +00:00
Code Issues Releases Wiki Activity

[place_tracker] ChangeNotifierProvider for state management (#424)

Browse Source
This commit is contained in:
Tushar Ojha
2020-06-13 05:20:46 +05:30
committed by GitHub
parent af5be70f34
commit 084c532ac0
8 changed files with 83 additions and 151 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
place_tracker/lib/place_list.dart
View File

@@ -1,4 +1,5 @@
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'place.dart';
import 'place_details.dart';
@@ -16,24 +17,27 @@ class PlaceListState extends State<PlaceList> {
void _onCategoryChanged(PlaceCategory newCategory) {
_scrollController.jumpTo(0.0);
AppState.updateWith(context, selectedCategory: newCategory);
Provider.of<AppState>(context, listen: false)
.setSelectedCategory(newCategory);
}
void _onPlaceChanged(Place value) {
// Replace the place with the modified version.
final newPlaces = List<Place>.from(AppState.of(context).places);
final newPlaces =
List<Place>.from(Provider.of<AppState>(context, listen: false).places);
final index = newPlaces.indexWhere((place) => place.id == value.id);
newPlaces[index] = value;
AppState.updateWith(context, places: newPlaces);
Provider.of<AppState>(context, listen: false).setPlaces(newPlaces);
}
@override
Widget build(BuildContext context) {
var state = Provider.of<AppState>(context);
return Column(
children: <Widget>[
_ListCategoryButtonBar(
selectedCategory: AppState.of(context).selectedCategory,
selectedCategory: state.selectedCategory,
onCategoryChanged: (value) => _onCategoryChanged(value),
),
Expanded(
@@ -41,10 +45,8 @@ class PlaceListState extends State<PlaceList> {
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)
children: state.places
.where((place) => place.category == state.selectedCategory)
.map((place) => _PlaceListTile(
place: place,
onPlaceChanged: (value) => _onPlaceChanged(value),