Added sell commodity feature.

shop/shopform.h

@@ -7,6 +7,7 @@
 #include <autotablemodel.h>
 
 class ShopItem;
+class IShopItem;
 
 namespace Ui {
 class ShopForm;
@@ -31,7 +32,7 @@ private slots:
 
     void on_loadButton_clicked();
 
-    void onCountChanged();
+    void onCountChanged(int oldCount);
 
     void on_receiptCombo_currentIndexChanged(int index);
 
@@ -39,6 +40,8 @@ private slots:
 
     void on_showPaiedButton_clicked();
 
+    void on_btnAddItem_clicked();
+
 private:
     Ui::ShopForm *ui;
     QSharedPointer<Voucher> m_voucher;
@@ -50,6 +53,7 @@ private:
     void changeReceipt();
     void connectItemSignals();
     void createEmptyVoucher();
+    void addItem(QSharedPointer<IShopItem> item, int count);
 };
 
 #endif // SHOPFORM_H