[PySide] QSortFilterProxyModel and QListView - indexWidget pointer get deleted when filtering

[Stefan Champailler]

Yep, Jesus idea seems right. PySide (an dPyQt4) I guess being C++ bindings, one has to be careful with pointers. This is quite misleading sometimes. Fortunatelemy, with times, one learns the safe design patterns, so it(s not much of a problem.

By the way, it's quite surprising to see a reference to a view widget (QLabel) in a model item. I don't say it leads to bug nor that it is plain wrong, but it's just not very MVC (model view ocntroller pattern)

stF


On Sun, 10 Aug 2014 00:26:30 +0200
Jesus <ea7dfh at ea7dfh.com> wrote:

> Hi
> 
> I'm not an expert programmer in python nor pyside by far, but I've made 
> a test using pyqt4 with your code and the error is the same.
> 
> This is the kind of bug when an object loss its reference to itself 
> inside a class. So I would check if the label item still has a parent 
> when it is filtered (or deleted?) by the model. I may be wrong, of 
> course, so please be gentle.
> 
> Regards,
> 
> Jesus
> 
> El 09/08/14 23:28, Stefan Champailler escribió:
> > I've removed some useless code but the issue still is there...
> >
> > really sounds like a bug...
> >
> > stF
> >
> >
> > On Sat, 9 Aug 2014 23:10:33 +0200
> > Stefan Champailler <schampailler at skynet.be> wrote:
> >
> >> Hi MAtthieu,
> >>
> >> I can reproduce your bug
> >>
> >> Could you try to make a simpler version of your code ? Sometimes, it helps to sort out other causes of error (I had my share of dangling pointer with PySide...)
> >>
> >> Stefan
> >>
> >>
> >>
> >> On Fri, 8 Aug 2014 12:06:58 +0200
> >> Matthieu Cadet <matthieu.cadet at gmail.com> wrote:
> >>
> >>> Hi
> >>>
> >>> As I didn't get answer yet, I've also post a question on StackOverflow
> >>>
> >>> http://stackoverflow.com/questions/24995936/pyside-qsortfilterproxymodel-and-qlistview-indexwidget-pointer-get-deleted-w
> >>>
> >>> Someone has test the code on Windows 7 with PySide 1.2.2 and Python 3.3 and
> >>> says it works for him without RuntimeError message....
> >>>
> >>> I'm still trying to find a solution to this problem :P
> >>>
> >>>
> >>>
> >>> On Mon, Jul 28, 2014 at 2:26 PM, Matthieu Cadet <matthieu.cadet at gmail.com>
> >>> wrote:
> >>>
> >>>> Hi PySide guru's
> >>>>
> >>>> I've a problem with a custom QListView I'm trying to make, here the
> >>>> problem:
> >>>>
> >>>> I'm using QListView to show a list of QWidget object by using
> >>>> QListView.setIndexWidget(),
> >>>> this works pretty fine, but now I want to filter the item model by
> >>>> using QSortFilterProxyModel()
> >>>> with .setFilterWildcard() it is not working very well because the second
> >>>> time the model is filtered
> >>>> I got error like this :
> >>>>
> >>>> *RuntimeError: Internal C++ object (PySide.QtGui.QLabel) already deleted.*
> >>>>
> >>>> Without using filtering and QSortFilterProxyModel everything works fine,
> >>>> but it seems I'm missing
> >>>> something with the filtering operation, the indexWidget() is deleted when
> >>>> using filtering :(
> >>>>
> >>>> here a sample code where you can reproduce the bug, when list view is
> >>>> shown, hit 1,2 or 3 keyboard
> >>>> key to activate filtering ( Backspace to set filtering empty to show all
> >>>> items )
> >>>>
> >>>> *https://gist.github.com/66e29df303d1f1825a53.git
> >>>> <https://gist.github.com/66e29df303d1f1825a53.git>*
> >>>>
> >>>>
> >>>> Can someone please help me on this? is this a known bug ? or I'm doing it
> >>>> completely wrong :P
> >>>>
> >>>> Thanks in advance for your help.
> >>>>
> >>>> --
> >>>> Matthieu Cadet
> 
> 
> 
> -- 
> Jesus Guardon
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