From c061e361ebd08f15541f4e40a2b3279883229bee Mon Sep 17 00:00:00 2001
From: Jonas Franz <jonas.franz@incloud.de>
Date: Sat, 19 Feb 2022 14:41:37 +0100
Subject: [PATCH] Add product selection store

---
 lib/models/product.dart                 |  4 +++-
 lib/stores/product_selection_store.dart | 31 +++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 1 deletion(-)
 create mode 100644 lib/stores/product_selection_store.dart

diff --git a/lib/models/product.dart b/lib/models/product.dart
index 1b73556..32b4f05 100644
--- a/lib/models/product.dart
+++ b/lib/models/product.dart
@@ -1,8 +1,10 @@
 import 'package:flutter/foundation.dart';
 
+typedef ProductTitle = String;
+
 @immutable
 class Product {
-  final String title;
+  final ProductTitle title;
   final double price;
 
   String get priceAsString => price.toStringAsFixed(2);
diff --git a/lib/stores/product_selection_store.dart b/lib/stores/product_selection_store.dart
new file mode 100644
index 0000000..168a4c4
--- /dev/null
+++ b/lib/stores/product_selection_store.dart
@@ -0,0 +1,31 @@
+import 'package:flutter/material.dart';
+import 'package:thesis_shop/models/product.dart';
+
+class ProductSelectionStore extends InheritedWidget {
+  const ProductSelectionStore({
+    Key? key,
+    required this.products,
+    required this.productAmounts,
+    required this.increaseAmount,
+    required this.decreaseAmount,
+    required Widget child,
+  }) : super(key: key, child: child);
+
+  final List<Product> products;
+  final Map<ProductTitle, int> productAmounts;
+
+  final Function(Product) increaseAmount;
+  final Function(Product) decreaseAmount;
+
+  static ProductSelectionStore of(BuildContext context) {
+    final ProductSelectionStore? result =
+        context.dependOnInheritedWidgetOfExactType<ProductSelectionStore>();
+    assert(result != null, 'No ProductSelectionStore found in context');
+    return result!;
+  }
+
+  @override
+  bool updateShouldNotify(ProductSelectionStore oldWidget) {
+    return productAmounts != oldWidget.productAmounts;
+  }
+}