Index: sources/main.h
===================================================================
diff -u -r31b9ae63410e7ca23f0f849e38368880e4c402b4 -rb798668f16ad0967ab97e96f5f9a2cdd821e899f
--- sources/main.h	(.../main.h)	(revision 31b9ae63410e7ca23f0f849e38368880e4c402b4)
+++ sources/main.h	(.../main.h)	(revision b798668f16ad0967ab97e96f5f9a2cdd821e899f)
@@ -1,18 +1,14 @@
 /*!
  *
  * Copyright (c) 2019-2020 Diality Inc. - All Rights Reserved.
- * copyright
-
+ * \copyright
  *          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
- * date    10/25/2019
- * author  Behrouz NematiPour
+ * \file    main.h
+ * \date    10/25/2019
+ * \author  Behrouz NematiPour
  *
  */
 #pragma once
@@ -51,32 +47,47 @@
 //--------------------------------------------------------------------------------//
 //--------------------------------------------------------------------------------//
 #define DEBUG_PROPERTY_CHANGED(vVARIABLE) //qDebug() << "#" << #vVARIABLE << v##vVARIABLE;
-#define PROPERTY(vTYPE , vVARIABLE , vDEFVALUE, vALWAYSEMIT )   \
-      Q_PROPERTY(vTYPE   vVARIABLE                              \
-                  READ   vVARIABLE                              \
-                  WRITE  vVARIABLE                              \
-                  NOTIFY vVARIABLE##Changed)                    \
-      Q_SIGNALS:                                                \
-        void          vVARIABLE##Changed                        \
-                               ( const vTYPE & v##vVARIABLE );  \
-    private:                                                    \
-        vTYPE    _##vVARIABLE  =       vDEFVALUE;               \
-        vTYPE       vVARIABLE () const {                        \
-          return _##vVARIABLE ;                                 \
-        }                                                       \
-        void        vVARIABLE (  const vTYPE & v##vVARIABLE ) { \
-          static bool init = false;                             \
-          if (   vALWAYSEMIT                                    \
-              || ! init                                         \
-              || _##vVARIABLE != v##vVARIABLE               ) { \
-                 DEBUG_PROPERTY_CHANGED(vVARIABLE)              \
-                 init = true;                                   \
-                 _##vVARIABLE  = v##vVARIABLE;                  \
-                 emit vVARIABLE##Changed( _##vVARIABLE );       \
-          }                                                     \
+//--------------------------------------------------------------------------------//
+#define PROPERTY_SLOT(          vTYPE ,    vVARIABLE )    \
+        void vVARIABLE (  const vTYPE & v##vVARIABLE ) {  \
+          static bool init = false;                       \
+          if ( !init || _##vVARIABLE != v##vVARIABLE ) {  \
+                 DEBUG_PROPERTY_CHANGED(vVARIABLE)        \
+                 init = true;                             \
+                 _##vVARIABLE  = v##vVARIABLE;            \
+                 emit vVARIABLE##Changed( _##vVARIABLE ); \
+          }                                               \
         }
 //--------------------------------------------------------------------------------//
+#define TRIGGER_SLOT(           vTYPE ,    vVARIABLE  )   \
+        void  vVARIABLE ( const vTYPE & v##vVARIABLE  ) { \
+            DEBUG_PROPERTY_CHANGED(vVARIABLE)             \
+            _##vVARIABLE  = v##vVARIABLE;                 \
+            emit vVARIABLE##Triggered( _##vVARIABLE );    \
+        }
 //--------------------------------------------------------------------------------//
+#define PROPERTY_BASE(vTYPE , vVARIABLE , vDEFVALUE, vSIGNAL)    \
+      Q_PROPERTY(     vTYPE   vVARIABLE                          \
+                       READ   vVARIABLE                          \
+                       WRITE  vVARIABLE                          \
+                       NOTIFY vVARIABLE##vSIGNAL)                \
+      Q_SIGNALS:                                                 \
+          void vVARIABLE##vSIGNAL( const vTYPE & v##vVARIABLE ); \
+        private:                                                 \
+          vTYPE    _##vVARIABLE = vDEFVALUE;                     \
+          vTYPE       vVARIABLE () const {                       \
+            return _##vVARIABLE ;                                \
+          }
+//--------------------------------------------------------------------------------//
+#define PROPERTY(      vTYPE , vVARIABLE , vDEFVALUE            ) \
+        PROPERTY_BASE( vTYPE , vVARIABLE , vDEFVALUE , Changed  ) \
+        PROPERTY_SLOT( vTYPE , vVARIABLE)
+//--------------------------------------------------------------------------------//
+#define TRIGGER(       vTYPE , vVARIABLE , vDEFVALUE            ) \
+        PROPERTY_BASE( vTYPE , vVARIABLE , vDEFVALUE , Triggered) \
+        TRIGGER_SLOT(  vTYPE , vVARIABLE)
+//--------------------------------------------------------------------------------//
+//--------------------------------------------------------------------------------//
 #define ACTION_METHOD_BRIDGE_CONNECTION(vMETHOD, vSOURCE, vTYPE)        \
     connect(&vSOURCE, SIGNAL(did##vMETHOD(const    vTYPE &)),           \
             this    ,   SLOT( on##vMETHOD(const    vTYPE &)));