Handles a resize event for this overlay, centering the central widget if
        one is found.

        :param      event | <QtCore.QEvent>

def resizeEvent(self, event):
        """
        Handles a resize event for this overlay, centering the central widget if
        one is found.

        :param      event | <QtCore.QEvent>
        """
        super(XOverlayWidget, self).resizeEvent(event)
        self.adjustSize()