Issue #2982938: Display order total in cart block

Closes #2982938

modules/cart/src/Plugin/Block/CartBlock.php

@@ -2,6 +2,7 @@
 
 namespace Drupal\commerce_cart\Plugin\Block;
 
+use Drupal\commerce_price\Price;
 use Drupal\Core\Block\Attribute\Block;
 use Drupal\Core\Block\BlockBase;
 use Drupal\Core\Cache\Cache;
@@ -114,7 +115,11 @@ class CartBlock extends BlockBase implements ContainerFactoryPluginInterface {
       return $cart->hasItems() && $cart->cart->value;
     });
 
+    /** @var \Drupal\commerce_store\Entity\StoreInterface $store */
+    $store = $this->entityTypeManager->getStorage('commerce_store')->loadDefault();
+
     $count = 0;
+    $total = new Price('0', !empty($store) ? $store->getDefaultCurrencyCode() : 'USD');
     $cart_views = [];
     if (!empty($carts)) {
       $cart_views = $this->getCartViews($carts);
@@ -122,6 +127,9 @@ class CartBlock extends BlockBase implements ContainerFactoryPluginInterface {
         foreach ($cart->getItems() as $order_item) {
           $count += (int) $order_item->getQuantity();
         }
+        if ($cart_total = $cart->getTotalPrice()) {
+          $total = $total->add($cart_total);
+        }
         $cacheable_metadata->addCacheableDependency($cart);
       }
     }
@@ -160,6 +168,7 @@ class CartBlock extends BlockBase implements ContainerFactoryPluginInterface {
         'contexts' => ['cart'],
       ],
       '#dropdown' => $this->configuration['dropdown'],
+      '#total' => $total,
     ];
   }