[Development] Issues with QFormBuilder - All properties modified & Invalid UI

Hugo Slepicka hhslepicka at gmail.com
Tue Oct 29 17:48:36 CET 2019

I agree with Giuseppe and I would like to add to it the fact that
properties are restored in what I could guess as alphabetical order, which
in itself already causes problems for custom widgets.
That said, when developing custom widgets developers must pay attention to
this fact of properties that are somewhat interlinked. It comes as a
surprise that the core Qt code does not take that into consideration.
More and more this looks to me like a bug that should be addressed.
Even if not using the QFormBuilder and a user change all the properties at
a widget using the Qt Designer we are subject to the same issue, aren't we?

On Tue, Oct 29, 2019 at 4:14 AM Giuseppe D'Angelo via Development <
development at qt-project.org> wrote:

> On 29/10/2019 11:32, Jaroslaw Kobus wrote:
> > Take any of QWidget's properties, e.g. sizePolicy, grep through qt
> sources
> > and search where setSizePolicy is used -
> QAbstractSlider::setOrientation(),
> > so "orientation" property of abstract slider influences "sizePolicy" -
> non-orthogonality detected.
> > If you store both properties, and then read them - the result depend on
> the read order.
> Sorry, I'm lost now. If you store them both and apply them in either
> order, shouldn't the result be correct no matter what?
> ==
> If this is not true for some case: we have an API problem, and we can
> debate whether it's in the class featuring interlinked properties, or in
> the meta property system that is not clearly reflecting the
> dependencies, thus making a (de)serializer of such properties impossible
> to write correctly. And the latter has way more profound implications
> than just serializing the state of a QObject (e.g. thinking of IPC like
> DBus, QtRO, etc.).
> Thanks,
> --
> Giuseppe D'Angelo | giuseppe.dangelo at kdab.com | Senior Software Engineer
> KDAB (France) S.A.S., a KDAB Group company
> Tel. France +33 (0)4 90 84 08 53, http://www.kdab.com
> KDAB - The Qt, C++ and OpenGL Experts
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