[Interest] Guide me through the Qt offerings for GUIs

[Nuno Santos]

Rui,

You need to extend QQuickItem and create your scene graph.

Open QtCreator and search for scene graph examples. Take a special look to "Scene Graph - Custom Geometry”

Best,

Nuno

> On 15 Apr 2021, at 11:25, Rui Oliveira <ruilvo at hotmail.com> wrote:
> 
> Hey,
> As per the title implies, I would like some comments on the GUI offerings Qt currently has. 
> 
> I'll share my own assessments and needs, and I'd like very much to hear your comments.
> 
> So:
> 
> I want to write a desktop application. This desktop application would not involve displaying lists of things, which seems to be what all tutorials/guides/courses are about, especially on the QML side. This application would involve some "custom graphics", namely a FFT display, and a "waterfall" display. You can google for "GQRX" and you'll know what I want.
> 
> 
> 
> And then I looked at Qt, and:
> 
> First thing I have looked at were QWidgets. I feel comfortable staying in the C++ domain. To implement said custom widgets I gave a shot to a class inheriting from QOpenGLWidget. And honestly, the experience wasn't bad at all! 
> 
> But, I feel very hesitant to start a project on QWidgets. It feels like starting a project on dead tech. Although, I did watch Giuseppe D’Angelo's talk in Qt Desktop Days 2020 (slides [1] <https://www.qtdesktopdays.com/wp-content/uploads/2020/09/keynote.pdf>), and looking at slide 19, there seem to be prospects of evolution. My attention goes especially to "Accelerate widget rendering & compositing through RHI". Will QWidgets really have a RHI backend? And a QRhiWidget option? Or maybe just QWidget and everything HW accelerated? I can dream...
> 
> I know QWidgets are no longer "interesting". Even KDE moved on from them... And I understand that's not where the money is for now... Still, I'd like some comments.
> 
> Now, QML.
> 
> Slide 25 of the same talk mentions native desktop styling for QQC2. I can't find documentations on this. Are they already available yet? Also, in the previous slide, "Planned in Qt 6.x: C++ API for Qt Quick elements". Does this mean Qt Quick *without* QML? 
> 
> Also, in QML it seems to be very hard to have anything native-looking. I looked at Qt Labs Platform [2] <https://doc.qt.io/qt-6/qtlabsplatform-index.html> and things like the right click menu aren't available on Windows, for example. Are there plans to expand this? 
> 
> 
> 
> Either way, I'm quite divided. I'd like to hear your thoughts and recommendations. 
> 
> In summary, it would seem that my options for the desktop with Qt are two self-competing technologies: one "half-dead", one "3/4-baked"... I'd really love to be wrong.
> 
> 
> 
> Thank you for your time,
> Rui
> 
> 
> 
> For those reading in plain text:
> [1] https://www.qtdesktopdays.com/wp-content/uploads/2020/09/keynote.pdf <https://www.qtdesktopdays.com/wp-content/uploads/2020/09/keynote.pdf> 
> [2] https://doc.qt.io/qt-6/qtlabsplatform-index.html <https://doc.qt.io/qt-6/qtlabsplatform-index.html>
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