Added sell commodity feature.

shop/shopitem.h

@@ -10,6 +10,7 @@ class SHOPSHARED_EXPORT ShopItem : public QObject, public IShopItem
 {
     Q_OBJECT
 
+    Q_PROPERTY(QString code READ code)
     Q_PROPERTY(QString name READ name)
     Q_PROPERTY(QDecDouble unitPrice READ unitPrice)
     Q_PROPERTY(Enums::VatType vatType READ vatType)
@@ -24,10 +25,13 @@ public slots:
     // IShopItem interface
 public:
     virtual int id() override { return 0; }
+    virtual QString code() { return ""; }
     virtual QString name() override { return ""; }
     virtual QDecDouble unitPrice() override { return QDecDouble(); }
     virtual Enums::VatType vatType() override { return Enums::NONE; }
     virtual QString pluginId() override { return ""; }
 };
 
+typedef QSharedPointer<ShopItem> ShopItemPtr;
+
 #endif // SHOPITEM_H