mouse button double click event never happen

a QListView object named listView ,and it's parent is a QWidget object named widget, widget installed an event filter by installEventFilter function and deal event with override function eventFilter,In eventFilter function,print every event type happened in listView .when I click mouse left button twice and Interval is very short,it print below information:

   QEvent::Type(KeyPress)
   QEvent::Type(ShortcutOverride)
   QEvent::Type(KeyPress)
   QEvent::Type(KeyRelease)
   QEvent::Type(KeyRelease)

No QEvent::Type(MouseButtonDblClick) happened,never!!!