def _scaleToFit(self):
widget = self.__centralWidget
if widget is None or not self.__fitInView:
return
vpsize = self.__viewportContentSize()
size = widget.size()
if not size.isEmpty():
sc = scaled(size, vpsize, self.__aspectMode)
sx = sc.width() / size.width()
sy = sc.height() / size.height()
self.setTransform(QTransform().scale(sx, sy))
def pixmapTransform(self) -> QTransform:
if self.__pixmap.isNull():
return QTransform()
pxsize = QSizeF(self.__pixmap.size())
crect = self.contentsRect()
transform = QTransform()
transform = transform.translate(crect.left(), crect.top())
if self.__scaleContents:
csize = scaled(pxsize, crect.size(), self.__aspectMode)
else:
csize = pxsize
xscale = csize.width() / pxsize.width()
yscale = csize.height() / pxsize.height()
return transform.scale(xscale, yscale)
def sizeHint(self, which, constraint=QSizeF(-1, -1)) -> QSizeF:
if which == Qt.PreferredSize:
sh = QSizeF(self.__pixmap.size())
if self.__scaleContents:
sh = scaled(sh, constraint, self.__aspectMode)
return sh
elif which == Qt.MinimumSize:
if self.__scaleContents:
return QSizeF(0, 0)
else:
return QSizeF(self.__pixmap.size())
elif which == Qt.MaximumSize:
if self.__scaleContents:
return QSizeF()
else:
return QSizeF(self.__pixmap.size())
else:
# Qt.MinimumDescent
return QSizeF()