@Vikram, Thanks but in this way i lost id number of each object for example by this, that you told, i can know sender is from Class1 but which object of this class send? by "void setMapping(QObject * sender, int id)" i can know object number and i can not know this object is from which class. now I could know which object (id) send and can not know this is from which class. One idea is I define 2 objects of QSignalMapper for each class (then i have 10 objects of QSignalMapper like:
Qt Code: 
  1. pushbutton_id_signalMapper->setMapping(QObject * sender, int id) 
  2.  pushbutton_type_signalMapper->setMapping(QObject * sender,  QWidget * widget)
  3.  
  4.  chekbox_id_signalMapper->setMapping(QObject * sender, int id) 
  5.  chekbox_type_signalMapper->setMapping(QObject * sender,  QWidget * widget)
  6. .
  7. .
  8. .
  9. spnbox_id_signalMapper->setMapping(QObject * sender, int id) 
  10. spnbox_type_signalMapper->setMapping(QObject * sender,  QWidget * widget)
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If I used QWidget * widget for identifying the class type, by what function I can know sender type? I mean when for example sender is PushButton then how can I know this:
Qt Code: 
  1. pushbutton_type_signalMapper->whatIsThisFunctionThatTellUsTheClassTypeToUseInsideSlot()//what function?
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thanks for any help!!!