Index: sources/main.h
===================================================================
diff -u -raeb915075b9e13e5c1aaf2800ba6db03b6c24a0b -r76d4131d70c18cbfaf47c242c17258e80161e8dc
--- sources/main.h	(.../main.h)	(revision aeb915075b9e13e5c1aaf2800ba6db03b6c24a0b)
+++ sources/main.h	(.../main.h)	(revision 76d4131d70c18cbfaf47c242c17258e80161e8dc)
@@ -158,6 +158,38 @@
           return _##vVARIABLE ;                                         \
         }
 //--------------------------------------------------------------------------------//
+#define READONLY_BASE(vTYPE , vVARIABLE , vDEFVALUE, vSIGNAL)           \
+    /*! \brief   Qt Read-Only Property declaration
+        \details The Qt Property definition by Q_PROPERTY documentation.
+    */\
+    Q_PROPERTY(     vTYPE   vVARIABLE                                   \
+                     READ   vVARIABLE                                   \
+                     NOTIFY vVARIABLE##vSIGNAL)                         \
+    Q_SIGNALS:                                                          \
+        /*! \brief   Property notify signal
+            \details The property notify signal (...Changed)
+                     which will be emitted by property setter
+                     - if only the value has been changed                                  \n
+                     - or it's the first time property is set.                             \n
+            \return  current value
+        */\
+        void vVARIABLE##vSIGNAL( const vTYPE & v##vVARIABLE );          \
+    private:                                                            \
+        vTYPE    _##vVARIABLE          = vDEFVALUE;                     \
+        bool     _##vVARIABLE##Changed = false;                         \
+    protected:                                                          \
+        /*! \brief   Property getter
+            \details The property getter which reads the private variable
+            \return  current value
+        */\
+        vTYPE       vVARIABLE () const {                                \
+          return _##vVARIABLE ;                                         \
+        }
+//--------------------------------------------------------------------------------//
+#define READONLY(      vTYPE , vVARIABLE , vDEFVALUE            )       \
+        READONLY_BASE( vTYPE , vVARIABLE , vDEFVALUE , Changed  )       \
+        PROPERTY_SLOT( vTYPE , vVARIABLE)
+//--------------------------------------------------------------------------------//
 #define PROPERTY(      vTYPE , vVARIABLE , vDEFVALUE            )       \
         PROPERTY_BASE( vTYPE , vVARIABLE , vDEFVALUE , Changed  )       \
         PROPERTY_SLOT( vTYPE , vVARIABLE)