refs #640, value object orderable interface (same as ITimestampBased ..)

* interface and list
* added Q_DECLARE_INTERFACE

src/blackmisc/orderable.h

@@ -0,0 +1,68 @@
+/* Copyright (C) 2015
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKMISC_ORDERABLE_H
+#define BLACKMISC_ORDERABLE_H
+
+#include "blackmiscexport.h"
+#include "propertyindex.h"
+
+namespace BlackMisc
+{
+    //! Entity with timestamp
+    class BLACKMISC_EXPORT IOrderable
+    {
+    public:
+        //! Properties by index
+        enum ColumnIndex
+        {
+            IndexOrder = BlackMisc::CPropertyIndex::GlobalIndexIOrderable,
+            IndexOrderString
+        };
+
+        //! Order
+        int getOrder() const { return m_order; }
+
+        //! Order as string
+        QString getOrderAsString() const;
+
+        //! Set order
+        void setOrder(int order) { m_order = order; }
+
+        //! Valid order set?
+        bool hasValidOrder() const;
+
+        //! Can given index be handled
+        static bool canHandleIndex(const BlackMisc::CPropertyIndex &index);
+
+    protected:
+        //! Constructor
+        IOrderable();
+
+        //! Constructor
+        IOrderable(int order);
+
+        //! \copydoc BlackMisc::Mixin::Index::propertyByIndex
+        CVariant propertyByIndex(const BlackMisc::CPropertyIndex &index) const;
+
+        //! \copydoc BlackMisc::Mixin::Index::setPropertyByIndex
+        void setPropertyByIndex(const CVariant &variant, const BlackMisc::CPropertyIndex &index);
+
+        //! Compare for index
+        int comparePropertyByIndex(const IOrderable &compareValue, const CPropertyIndex &index) const;
+
+        int m_order = -1; //!< order number
+    };
+} // namespace
+
+Q_DECLARE_INTERFACE(BlackMisc::IOrderable, "org.swift-project.blackmisc.iorderable")
+
+#endif // guard