closes #4: Favorite buttons has been extended with category buttons.

commodity/data/commoditydata.h

@@ -24,11 +24,12 @@ class CommodityData : public IShopItem
     Q_PROPERTY(QDecDouble price READ price WRITE setPrice)
     Q_PROPERTY(Enums::VatType vat READ vat WRITE setVat)
     Q_PROPERTY(int count READ count WRITE setCount)
+    Q_PROPERTY(bool favorite READ favorite WRITE setFavorite)
 
 public:
     explicit CommodityData(QObject *parent = nullptr);
 
-    long id() override;
+    long id() const override;
     void setId(long id);
 
     QString name() override;
@@ -52,6 +53,9 @@ public:
     int count() const;
     void setCount(int count);
 
+    bool favorite() override;
+    void setFavorite(bool favorite);
+
     Q_INVOKABLE QStringList eagerLoad();
 
 private:
@@ -63,13 +67,15 @@ private:
     int m_price;
     Enums::VatType m_vat;
     int m_count;
+    bool m_favorite;
 
     // IShopItem interface
 public:
     QDecDouble unitPrice() override;
     Enums::VatType vatType() override;
-    QString pluginId() override;
-
+    QString pluginId() const override;
+    QString color() override;
+    QString category() override;
 };
 
 typedef QSharedPointer<CommodityData> CommodityDataPtr;