Could we see some code?
sure


Qt Code:
  1. void iv_isa::mousePressEvent ( QMouseEvent * event )
  2. {
  3. QPoint mouse_event_distance
  4. mouse_event_distance = mapToParent(event->pos()) - this->pos();
  5. }
  6.  
  7. void IV_label::mouseMoveEvent ( QMouseEvent * event )
  8. {
  9. this->move(mapToParent(event->pos()) - mouse_event_distance);
  10. }
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