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Code Issues Releases Wiki Activity

Maintenance for provider_shopper (#168)

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This commit is contained in:
Andrew Brogdon
2019-12-02 10:12:43 -08:00
committed by GitHub
parent 22f01ff4a6
commit 5b0fd46fed
6 changed files with 13 additions and 258 deletions
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6
provider_shopper/lib/main.dart
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@@ -27,8 +27,10 @@ class MyApp extends StatelessWidget {
// of ChangeNotifierProvider. Moreover, CartModel depends
// on CatalogModel, so a ProxyProvider is needed.
ChangeNotifierProxyProvider<CatalogModel, CartModel>(
builder: (context, catalog, previousCart) =>
CartModel(catalog, previousCart)),
initialBuilder: (context) => CartModel.empty(),
builder: (context, catalog, previousCart) =>
CartModel(catalog, previousCart),
),
],
child: MaterialApp(
title: 'Provider Demo',

7
provider_shopper/lib/models/cart.dart
View File

@@ -15,12 +15,17 @@ class CartModel extends ChangeNotifier {
/// Construct a CartModel instance that is backed by a [CatalogModel] and
/// an optional previous state of the cart.
///
/// If [previous] is not `null`, it's items are copied to the newly
/// If [previous] is not `null`, its items are copied to the newly
/// constructed instance.
CartModel(this._catalog, CartModel previous)
: assert(_catalog != null),
_itemIds = previous?._itemIds ?? [];
/// An empty cart with no Catalog.
CartModel.empty()
: _catalog = null,
_itemIds = [];
/// List of items in the cart.
List<Item> get items => _itemIds.map((id) => _catalog.getById(id)).toList();