Sets the pixmap size to the inputed value.
        
        :param      size | <QSize>

def setPixmapSize( self, size ):
        """
        Sets the pixmap size to the inputed value.
        
        :param      size | <QSize>
        """
        self._pixmapSize = size
        self.setMinimumHeight(size.height())
        self.adjustMinimumWidth()