On Fri, Oct 16, 2020 at 7:22 AM vince touache <fruityfr...@gmail.com> wrote:
> neat, works perfectly! > > w = self.nodesArea.takeWidget() > if w: # just in case the scrollArea was empty > w.setParent(self) > self.nodesArea.setWidget(node.node.gui) > > much more elegant and simple than what I had, thank you so much Justin! > Nice! > > Le jeu. 15 oct. 2020 à 14:12, vince touache <fruityfr...@gmail.com> a > écrit : > >> oh that's weird. Did you try it via mayapy or directly via your python >> interpreter? I'll give it a try with python/qt outside of maya >> anyway, your github link is pure gold, I can indeed see that the >> scrollArea apparently removed the widget ! I used reparenting a lot in the >> past, and it always worked well, but my setups were always pretty simple. >> Here, regardless of the (new) parent, setWidget will remove the previous >> one first. >> I'll give it another try, but this time I'll call >> QScrollArea.takeWidget() first, store the widget, and only then, call >> setWidget >> >> I'll let you know how it goes =] >> >> Thank you! >> >> Le jeu. 15 oct. 2020 à 13:21, Justin Israel <justinisr...@gmail.com> a >> écrit : >> >>> I wasn't able to reproduce your problem from the code you provided. You >>> may need to consolidate it into a single file that can be executed, or be >>> more specific about the conditions under which you are executing it. But >>> either way, I agree with your idea that it is related to calling >>> QScrollArea.setWidget. It looked to me that the problem was trying to set >>> the parent on the previous widget before you replace it with another one. >>> My expectations of what setWidget should do would end up still doing >>> something with the previous widget even though you changed its parent. You >>> can actually see exactly what it is doing here: >>> https://github.com/qt/qtbase/blob/dev/src/widgets/widgets/qscrollarea.cpp#L255 >>> It looks like setWidget will always delete the previous one if it is >>> still set, because the QScrollArea takes ownership of it when you first set >>> it. But you can explicitly take the ownership back instead of having the >>> QScrollArea manage the lifetime: >>> https://doc.qt.io/qt-5/qscrollarea.html#takeWidget >>> So maybe this is the fix: >>> >>> prev_widget = self.scrollArea.takeWidget() >>> >>> >>> On Fri, Oct 16, 2020 at 5:49 AM vince touache <fruityfr...@gmail.com> >>> wrote: >>> >>>> it looks like QSCrollArea.setWidget() does a lot more than what it >>>> seems. And seems to be partially related to my issue. E.g. >>>> >>>> *If the scroll area is visible when the widget is added, you >>>> must show() <https://doc.qt.io/qt-5/qwidget.html#show> it explicitly.* >>>> >>>> or >>>> >>>> *Note that You must add the layout of widget before you call this >>>> function; if you add it later, the widget will not be visible - regardless >>>> of when you *show() <https://doc.qt.io/qt-5/qwidget.html#show>* the >>>> scroll area. In this case, you can also not *show() >>>> <https://doc.qt.io/qt-5/qwidget.html#show>* the *widget *later.* >>>> >>>> As a temp solution, I use a QStackedWidget() to keep all my widgets and >>>> display them when needed, but I would really like to understand why my >>>> widget is destroyed despite the reparenting, in the example above >>>> >>>> cheers >>>> Le jeudi 15 octobre 2020 à 09:13:42 UTC-4, vince touache a écrit : >>>> >>>>> hello, >>>>> >>>>> I have this good old *internal C++ object already deleted *and can't >>>>> understand where it comes from >>>>> To summarize, I have a QMainWindow with a QScrollArea, and I want to >>>>> parent/unparent widgets into this QScrollArea. Ofc I make sure to >>>>> re-parent >>>>> the widget I'm about to remove, to make sure it never gets unparented and >>>>> garbage collected, but it doesn't change anything.... >>>>> >>>>> Since I still don't know how to format code on google groups (yay >>>>> \o/), I updated some code on github >>>>> <https://github.com/fruityvince/debug> if someone wants to try it , >>>>> and here is a snippet to reproduce the error >>>>> >>>>> import main;import foo >>>>> m = main.Main() # this is my main window >>>>> m.show() >>>>> # now I create 2 widgets, and I want to display the first one in my >>>>> scrollArea, then the second, then come back on my first >>>>> bar1 = foo.Bar("bar1") >>>>> bar2 = foo.Bar("bar2") >>>>> >>>>> # now I parent it to my scrollArea >>>>> m.something_triggered(bar1) >>>>> m.something_triggered(bar2) # this is where bar1 gets deleted, even >>>>> though i reparent it before replacing with bar2 >>>>> >>> # RuntimeError: Internal C++ object (PySide2.QtWidgets.QLabel) >>>>> already deleted. # >>>>> >>>>> Can anyone explain me why / how my bar1 gets deleted, even though I >>>>> parent it to my mainWindow to prevent garbage collection? >>>>> >>>>> Thank you >>>>> >>>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Python Programming for Autodesk Maya" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to python_inside_maya+unsubscr...@googlegroups.com. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/python_inside_maya/a6fef101-6378-4b3d-9bac-00c95936afd3n%40googlegroups.com >>>> <https://groups.google.com/d/msgid/python_inside_maya/a6fef101-6378-4b3d-9bac-00c95936afd3n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Python Programming for Autodesk Maya" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to python_inside_maya+unsubscr...@googlegroups.com. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/python_inside_maya/CAPGFgA0i%3DSB0GCsgYwF_0xL7GsQkTv%2B0A7g2iB3r8TQyLZV%2BWg%40mail.gmail.com >>> <https://groups.google.com/d/msgid/python_inside_maya/CAPGFgA0i%3DSB0GCsgYwF_0xL7GsQkTv%2B0A7g2iB3r8TQyLZV%2BWg%40mail.gmail.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- > You received this message because you are subscribed to the Google Groups > "Python Programming for Autodesk Maya" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to python_inside_maya+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/python_inside_maya/CAHChmQZZSo50C%2BD%3D0PFNP1Jhep%2BVrzM5FbaWidC--VBavj%2BZbw%40mail.gmail.com > <https://groups.google.com/d/msgid/python_inside_maya/CAHChmQZZSo50C%2BD%3D0PFNP1Jhep%2BVrzM5FbaWidC--VBavj%2BZbw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Python Programming for Autodesk Maya" group. 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