[Interest] Guide me through the Qt offerings for GUIs

Rui Oliveira ruilvo at hotmail.com
Sat Apr 17 17:15:17 CEST 2021

I've had success in a proof-of-concept using a custom widget inherited 
from QOpenGLWidget and using the QPainter API. In fact, that GQRX app I 
mentioned uses basically the same approach.

But yeah, the node graph approach on Qt Quick does seem interesting.

I've also been monitoring:

This is quite high on my wish list... Let's hope it doesn't take to long!


Em 16/04/2021 18:23, Shawn Rutledge escreveu:
>> On 2021 Apr 15, at 12:25, 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.
> You probably want to go with a shader-based solution for rendering those displays really fast on the GPU, without a high CPU load, assuming that you are rendering them from raw data, not generating images with some other library, and assuming that your users tend to have GPUs.  I think Qt Quick (and Controls) is a good fit, but check out the qtdeclarative/examples/quick/scenegraph/graph example and see if you’d like to render your displays like that.  It is more work than using QPainter, but probably worth it if the data is updating quickly.
> If it turns out that you need to use QPainter for some reason, it’s going to be slower, higher CPU load, even higher if you want antialiasing; in that case, widgets are OK, or you can still use Qt Quick and subclass QQuickPaintedItem to do the custom rendering.  But it wouldn’t be my first choice.
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