Index: sources/main.h
===================================================================
diff -u -r14c541d2b780b0a244bc84860aa565cf8dd7fe4b -rf688ed9f1c64a2603a6d10fbb090b257a43e1f6f
--- sources/main.h	(.../main.h)	(revision 14c541d2b780b0a244bc84860aa565cf8dd7fe4b)
+++ sources/main.h	(.../main.h)	(revision f688ed9f1c64a2603a6d10fbb090b257a43e1f6f)
@@ -5,11 +5,11 @@
  * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
  * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
  * 
- * \file main.h
- * \author (last) Peter Lucia
- * \date (last) 15-Oct-2020
- * \author (original) Behrouz NematiPour
- * \date (original) 28-Oct-2019
+ * \file    main.h
+ * \author  (last)      Behrouz NematiPour
+ * \date    (last)      31-Mar-2021
+ * \author  (original)  Behrouz NematiPour
+ * \date    (original)  28-Oct-2019
  * 
  */
 #pragma once
@@ -19,6 +19,14 @@
 #include <QDebug>
 // Project
 
+// Application
+#define PRINT_THREAD_NAME_ENABLE 0
+#if (PRINT_THREAD_NAME_ENABLE)
+    #define PRINT_THREAD_NAME qDebug() << " ----- " << QThread::currentThread()->objectName() << __func__ ;
+#else
+    #define PRINT_THREAD_NAME
+#endif
+
 // TODO : A singleton parent class needs to be created
 // to taking care of the Threading, init, quit, and so
 
@@ -64,7 +72,7 @@
                      the notify signal (...Changed) passes the new value as its parameter.  \n
             \param   new value
         */\
-        void vVARIABLE (  const vTYPE & v##vVARIABLE ) {                \
+        void vVARIABLE ( const vTYPE & v##vVARIABLE ) {                 \
             static bool init = false;                                   \
             if ( !init || _##vVARIABLE != v##vVARIABLE ) {              \
                 DEBUG_PROPERTY_CHANGED(vVARIABLE, v)                    \
@@ -89,6 +97,24 @@
             emit vVARIABLE##Triggered( _##vVARIABLE );                  \
         }
 //--------------------------------------------------------------------------------//
+#define STATE_SLOT(             vTYPE ,    vVARIABLE         )          \
+    protected :                                                         \
+        /*! \brief   Property setter
+            \details The property setter which update the private variable                  \n
+                      - if only the value has been changed                                  \n
+                     emits the Property notify (...Entered) signal on update.               \n
+                     the notify signal (...Entered) passes the new value as its parameter.  \n
+            \param   new value
+        */\
+        void vVARIABLE ( const vTYPE & v##vVARIABLE                 ) { \
+            if ( _##vVARIABLE != v##vVARIABLE ) {                       \
+                DEBUG_PROPERTY_CHANGED(vVARIABLE, v)                    \
+                _##vVARIABLE  = v##vVARIABLE;                           \
+                emit vVARIABLE##Entered( _##vVARIABLE );                \
+            }                                                           \
+        }
+
+//--------------------------------------------------------------------------------//
 #define PROPERTY_BASE(vTYPE , vVARIABLE , vDEFVALUE, vSIGNAL)           \
     /*! \brief   Qt Property declaration
         \details The Qt Property definition by Q_PROPERTY documentation.
@@ -125,8 +151,13 @@
 #define TRIGGER(       vTYPE , vVARIABLE , vDEFVALUE            )       \
                                                                         \
         PROPERTY_BASE( vTYPE , vVARIABLE , vDEFVALUE , Triggered)       \
-        TRIGGER_SLOT(  vTYPE , vVARIABLE)
+        TRIGGER_SLOT ( vTYPE , vVARIABLE)
 //--------------------------------------------------------------------------------//
+#define STATE(         vTYPE , vVARIABLE , vDEFVALUE            )       \
+                                                                        \
+        PROPERTY_BASE( vTYPE , vVARIABLE , vDEFVALUE , Entered  )       \
+        STATE_SLOT   ( vTYPE , vVARIABLE)
+//--------------------------------------------------------------------------------//
 #define CONSTANT(      vTYPE , vVARIABLE , vDEFVALUE            )       \
     /*! \brief   Qt Constant Property declaration
         \details The Qt Property definition by Q_PROPERTY documentation.