def __add__(self, widget):
"""
Show widget on mdi area.
If widget does not have a subwindow assigned, create a new subwindow without enabling the WA_DeleteOnClose event.
This will allow subwindow to be hidden instead of destroyed. Otherwise, the closeEvent.accept() will cause
the "Internal c++ Object Already Deleted" problem.
If widget already has a subwindow, just show them (both the subwindow and the widget inside)!
:param widget:
:return:
"""
if not hasattr(widget, 'subwindow'):
subwindow = QMdiSubWindow()
subwindow.setWidget(widget)
rect = widget.geometry()
# DO NOT SET ATTRIBUTE WA_DeleteOnClose because we want window not to be destroyed
widget.subwindow = self.addSubWindow(subwindow)
subwindow.setGeometry(rect)
widget.subwindow.show()
widget.show()
widget.closeEvent = lambda x: self._subWindowClosed(x)
widget.setFocus()
logger.debug("Sub window opened. MDI area sub windows: %s",
self.subWindowList())
return self
def create_widget(self):
""" Create the underlying QMdiSubWindow widget.
"""
# We don't parent the subwindow immediately. It will be added
# explicitly by the parent QMdiArea during its layout pass.
# If we set the parent here, Qt will spit out warnings when
# it's set added to the area later on. We *could* parent it
# here, and simply not add it explicitly to the mdi area, but
# this way is more explicit and consistent with the rest of
# the framework.
widget = QMdiSubWindow()
widget.layout().setSizeConstraint(QLayout.SetMinAndMaxSize)
self.widget = widget
