Sets the fixed lookup query for this widget to the inputed query.
        
        :param      query | <orb.Query>

def setQuery( self, query ):
        """
        Sets the fixed lookup query for this widget to the inputed query.
        
        :param      query | <orb.Query>
        """
        self._query = query
        if ( not self.signalsBlocked() ):
            self.queryChanged.emit(query)