[Interest] Guide me through the Qt offerings for GUIs

Konstantin Shegunov kshegunov at gmail.com
Thu Apr 22 16:37:01 CEST 2021

On Thu, Apr 22, 2021 at 4:59 PM Jérôme Godbout <godboutj at amotus.ca> wrote:

> I wonder if it would be possible to totally declare the QtQuick scene from
> C++ without any Qml files actually, with Qt6 you got C++ binding and the
> Qml is compiled to C++ anyway. Maybe I miss something but it could be
> possible to actually only write C++ to create the actual scene?!

It will have been (even in Qt5) if the classes were public. In the end the
QML engine is really a glorified object factory. There are other problems
with that though, one such example is the tree control: GPL/Commercial for
QtQuick, while with widgets you get that directly with the same license as
the whole library (there are other such cases too, if I'm not mistaken) ...
and the mentioned already "native" look'n'feel.

I would not actually do this myself but it might attract some user that are
> scare of declarative

Many of us avoid it not because we are 'scared' as such, but because of
other more practically-relevant reasons.

> I stop using QWidgets a few years ago and I don’t miss it a bit, haven’t
> seen anything I could not achieved into Qml yet, some are a bit trickier
> than they should but in the end prototyping and modifying the GUI is so
> quick, I often make the change live when I’m working with my graphic
> designer and KDAB GammaRay (just need to apply those change after).

Well, I can build a nuclear power plant at home - probably I can achieve
it, but the fact of the matter is, should I? There are a couple of
considerations here. Firstly a lot of code is already written with the
widgets and even with best practices it's generally not trivial to do a
'face-lift'. Secondly, QML fails to sell its point to desktop devs due to
its C++ integration being a great PITA already. Anything that's non-trivial
ends up with (a) huge boilerplate wrapper(s). And while graphics
performance does matter, it's not typically the driving force on desktop,
where usually we value convenience over performance (on desktop you rarely
are pressed for resources). In fairness, exposing the property bindings
natively to C++ is a step, no doubt about it.
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