remove cart item dialog

mobile/lib/pages/cart_page.dart

@@ -62,7 +62,12 @@ class CartItemView extends StatelessWidget {
                                     icon: const Icon(Icons.add)),
                                 IconButton(
                                     onPressed: () {
+                                      if (cartRepo.willRemoveOnNextDecrement(
+                                          productId)) {
+                                        removeCartItemDialog(context);
+                                      } else {
                                         cartRepo.decrementAmount(productId);
+                                      }
                                     },
                                     icon: const Icon(Icons.remove))
                               ],
@@ -75,15 +80,54 @@ class CartItemView extends StatelessWidget {
                 )),
           ),
           IconButton(
-              onPressed: () {
+              onPressed: () => removeCartItemDialog(context),
-                cartRepo.removeCartItem(productId);
-              },
               icon: const Icon(Icons.delete_outline)),
           Image(width: 100, image: AssetImage(imagePath))
         ],
       ),
     );
   }
+
+  Future<void> removeCartItemDialog(BuildContext context) {
+    return showDialog<void>(
+      context: context,
+      builder: (BuildContext context) {
+        return AlertDialog(
+          content: Text(
+              "Er du sikker på, at du vil slette ${name.toLowerCase()} fra indkøbskurven?"),
+          actions: <Widget>[
+            Row(
+              mainAxisAlignment: MainAxisAlignment.center,
+              children: [
+                Container(
+                  margin: const EdgeInsets.only(right: 5),
+                  child: TextButton(
+                    style: TextButton.styleFrom(
+                        backgroundColor: Colors.red,
+                        foregroundColor: Colors.white),
+                    child: const Text('Slet'),
+                    onPressed: () {
+                      cartRepo.removeCartItem(productId);
+                      Navigator.of(context).pop();
+                    },
+                  ),
+                ),
+                Container(
+                  margin: const EdgeInsets.only(left: 5),
+                  child: PrimaryButton(
+                    child: const Text('Annullér'),
+                    onPressed: () {
+                      Navigator.of(context).pop();
+                    },
+                  ),
+                ),
+              ],
+            )
+          ],
+        );
+      },
+    );
+  }
 }
 
 class CartPage extends StatelessWidget {

mobile/lib/repos/cart.dart

@@ -78,7 +78,7 @@ class CartRepo extends ChangeNotifier {
   }
 
   void incrementAmount(int productId) {
-    var cartItem = withProductId(productId);
+    final cartItem = withProductId(productId);
     if (cartItem == null) {
       throw ProductIdException();
     }
@@ -87,18 +87,27 @@ class CartRepo extends ChangeNotifier {
   }
 
   void decrementAmount(int productId) {
-    var cartItem = withProductId(productId);
+    final cartItem = withProductId(productId);
     if (cartItem == null) {
       throw ProductIdException();
     }
-    if (--cartItem.amount <= 0) {
+    cartItem.amount -= 1;
+    if (cartItem.amount <= 0) {
       cart.remove(cartItem);
     }
     notifyListeners();
   }
 
+  bool willRemoveOnNextDecrement(int productId) {
+    final cartItem = withProductId(productId);
+    if (cartItem == null) {
+      throw ProductIdException();
+    }
+    return cartItem.amount <= 1;
+  }
+
   void removeCartItem(int productId) {
-    var cartItem = withProductId(productId);
+    final cartItem = withProductId(productId);
     if (cartItem == null) {
       throw ProductIdException();
     }
@@ -107,7 +116,7 @@ class CartRepo extends ChangeNotifier {
   }
 
   addToCart(Product product) {
-    var cartItem = withProductId(product.id);
+    final cartItem = withProductId(product.id);
     if (cartItem == null) {
       cart.add(CartItem(product: product, amount: 1));
     } else {