def sizeHint(self, which, constraint=QRectF()):
# type: (Qt.SizeHint, QSizeF) -> QSizeF
pw = 1.
sh = QSizeF()
if which == Qt.MinimumSize:
sh = QSizeF(pw, pw)
elif which == Qt.PreferredSize:
sh = QSizeF(pw, 30.)
elif which == Qt.MaximumSize:
sh = QSizeF(pw, QWIDGETSIZE_MAX)
if self.__orientation == Qt.Horizontal:
sh = sh.transposed()
return sh
