Stephen De Gabrielle wrote on 8/7/19 5:10 PM:
Mathematica uses QT!
There's a lot in Qt, just like there's a lot in GTK. Occasionally, a noteworthy project goes to a lot of trouble to switch from one to the other (e.g., Wireshark).
Thankfully, Racket has meant I mostly don't have to pick GUI toolkits, and that (in theory) I could migrate an entire desktop suite of applications to a new toolkit backend, because Racket already has the seasoned cross-platform layer over multiple native toolkits.
https://github.com/servo/webrender/ 'experimental render backend for Servo, but it can also be used as such in a standalone application.'
Since you're looking at multiple Mozilla HTML-ish application/GUI toolkits, you might also consider WebKit (which originated in the Qt/KDE universe, and also spun off Safari and Chrome). These all bring their own opportunities and burdens, but sometimes they're worthwhile.
https://doc.rust-lang.org/book/ch19-01-unsafe-rust.html#using-extern-functions-to-call-external-code - calling Rust functions from Racket and vice versa.
That might work, and could be just the thing for some purposes, but (for those on racket-users who don't already know) be judicious with FFI and same-process. If you've never had the experience of debugging a crash in which you don't know whether it's in any of the native libraries (including unsafe Rust) you're pulling in, or a bug in Racket, or a strange interaction of one or more GCs, or a bug in your FFI/extension bindings, or a bug in how the Racket application code is using a somewhat-fragile interface... that's a much better learning experience to have with a hobby project, than in production.
In the past, I greatly improved both the stability and performance of a large Racket production system by rewriting some C parts in pure Racket (this can be faster), and isolating other C parts into separate Linux processes.
That said, sometimes you should just do FFI. As an exercise, I made a character terminal library without FFI, and in hindsight, probably should've just done a little bit of FFI: https://www.neilvandyke.org/racket/charterm/
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