[Development] QML, Widgets, and setParent

Kevin Krammer kevin.krammer at kdab.com
Sat Nov 2 10:23:13 CET 2013

On Thursday, 2013-10-31, 20:17:43, Konrad Rosenbaum wrote:
> Hi,
> I'm trying to port KDAB's DeclarativeWidgets[1] to Qt5. 


> I've got it running
> for trivial QML files, however as soon as there are child widgets the
> running program aborts.
> The abort is caused by QObject::setParent, which contains this little gem:
> Q_ASSERT(!d->isWidget);

Hmm. The same code is in Qt4. I think it "works for me/us" because we are 
building against our distribution's Qt packages which are release builds and 
thus doesn't have the Q_ASSERT.

> I kind of ran out of ideas on how to solve this. Should I consider
> setParent, qqmlvme or the direct use of QWidgets as a bug?

I agree with Alan on setParent() being in error, the problem is some other 
areas rely on that. E.g. QWidget::parentWidget() does a static_cast of 
parent() to QWidget*


Kevin Krammer | kevin.krammer at kdab.com | Software Engineer
Klarälvdalens Datakonsult AB, a KDAB Group company
Tel. Sweden (HQ) +46-563-540090, USA +1-866-777-KDAB(5322)
KDAB - Qt Experts - Platform-independent software solutions
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