I've been following the work on COSMIC (though not super actively) and I keep on saying that I like what I'm seeing because, well, I do! The idea of a tiling DE is a very exciting one and COSMIC really has the potential to become a Major Linux DE.
I particularly like that, just like their current Gnome extension, it supports both tiling and floating, with a quick toggle between them.
This'll be a pretty interesting year for people interested in DEs.
As a regular i3 user, I was very satisfied on how tiling was implemented into the Pop shell of Gnome. After a few keybind change here and there it almost felt like home maneuvering the windows and workspaces. One minor complain is glitches happen when external monitor is connected/disconnected on the fly (laptop usecase), in which case windows are disoriented and thrown around at random unexpected places instead of staying at where they were. I'm blaming Gnome on that one however, since I'm assuming it is related on how Gnome handle multiple screens and Pop shell act on top of it, so I'm expecting it to be fixed in Cosmic DE
I'm just happy there's a rust DE being written in slint. KDE is nice and all, but it's all C++. No way am I touching that trainwreck of a language again.
COSMIC is being written in libcosmic, which is based on iced.
I'm confused. Slint says it's working with System76?
A great start to the week - @pop_os_official will collaborate with us to offer Slint as an alternative toolkit for application development on Cosmic Desktop.
#rustlang
The keyword is alternative. All first party applications are written natively with our libcosmic toolkit, which is based on iced-rs. We are using a fork of iced though because we needed to implement a custom runtime with the sctk (smithay client toolkit) for COSMIC applet development, but our desktop applications will use the original winit runtime.
Yeah, I’m a Pop user and like what they do with Gnome now. I can’t wait to see what it’s like when the desktop isn’t limited by the Gnome extension system.
I've been following Cosmic and really looking forward to it. I love the idea of a Gnome-like desktop without Gnome-like design decisions.
Incredibly excited to try it. I love the early support for Nix, I plan to run it as soon as a NixOS module becomes available!
Huge props to the design team here, the aesthetic looks amazing on all of the apps I've tried. They all feel consistent and look great.
[cosmic-randr] uses the wlr output configuration Wayland protocols.
Does this mean cosmic-randr should work on other compositors that support the wlr output configuration protocol (e.g. sway, hyprland, river, ...)? It's great to see cosmic adopting existing protocols, instead of compositor specific protocols (or worse, no external app support at all).
Also, it's great how portable Cosmic DE seems to be, as it's already mostly packaged on NixOS. On first look, cosmic-term seems to be a quick terminal so I might switch to it, as well as cosmic-files.
If they support the wlr output configuration protocols, then yes it'll work fine. There are some more advanced features that we want that aren't supported by the protocol though, so we will likely develop some cosmic protocol extensions for those features.
Tldr: New desktop environment designed for PopOS (but usable elsewhere)
It doesn't use GTK does it?
No, we have been making our own platform toolkit (libcosmic), which is built upon iced-rs. We are using this both for our wayland compositor applets, and our desktop applications.
iced? Interesting. I though it's still pretty experimental. There's no official documentation yet, right? When I was looking at Rust UI libraries Yew and Leptos looked more mature. I guess you're confident iced have enough backing and isn't going anywhere.
How do you find working in Rust on a bigger UI project? Any issues?
Iced is a lower level GUI library, similar to what GDK is to GTK. We built our own COSMIC-themed GUI toolkit around iced, which is called libcosmic. As we've gotten more and more widgets and application logic developed, actual application development with libcosmic is a breeze. Even if you do have to create a custom widget, it's much easier to creating custom widgets in GTK. We're able to develop much faster than we ever could with GTK now.
Yew and Leptos aren't comparable since they're not native GUI toolkits. These are for web developers rather than application development. It wouldn't be possible to use this for developing layer shell applets for COSMIC, either.
This sounds really cool. I don't see any documentation for libcosmic. Are you planning to promote it as an alternative toolkit for building desktop apps or do you see it more as an internal tool strictly for COSMIC DE development?
As of today, https://pop-os.github.io/libcosmic/cosmic/ is now available.
What's the accessibility story for blind users for example?
Is it going to be suitable to use with proper bindings with other languages or it's not an interest at this time or are there plans to support things like that and stability of apis, etc?
We are integrating AccessKit into libcosmic for accessibility support.
If you want to develop applets and/or applications with libcosmic, you must do so with Rust. There are no plans to develop C bindings for libcosmic.
You can generate documentation by running cargo doc and browsing the generated web pages in target/doc. There are also examples in the examples directory of libcosmic, as well as a design demo example which is a WIP.
libcosmic is an alternative toolkit for building desktop applications and layer shell applets. It wouldn't make much sense to build a toolkit only for ourselves. It's the best way to develop layer shell applets for COSMIC, and other Wayland compositors that support the layer shell protocol.
Btw, is this the only reason that cosmic isn't gtk, or are there other reasons? Because afiak gtk uses/can use rust.
The GTK4 project was cancelled for multiple reasons. We originally began working on Relm4 to use GTK4 for COSMIC applets. While others on the team were also experimenting with alternative Rust GUI libraries.
It required a lot of effort to patch GTK4 to support the Wayland layer shell protocol. Getting those patches merged into GTK4 was also taking a much longer time. There were long delays between code reviews; and they also wanted a series of much larger refactoring changes to be made to GTK4 before exposing the layer shell feature. It was much easier to get layer-shell working with iced, as it is a much leaner and concise code base.
GTK does not support fractional scaling, which is something we want our applets to support on day one. This was one of our major concerns. A concern that didn't apply to iced.
It was also exceedingly difficult to create custom widgets with GTK in Rust. Even those of us with years of experience considered it to be unreasonably difficult. So it was not feasible to expect new hires on the team to be able to comfortably develop COSMIC components with it. In comparison, our team was able to develop custom widgets with iced with much less effort and with greater flexibility, so the demand for iced grew stronger.
At the end of the day, GTK is not a Rust toolkit, and its API is cumbersome to adapt to Rust. Use of GTK would always be a compromise that lessens the developer experience for COSMIC app and applet development. A compromise that would eventually require us to rewrite everything in a native Rust GUI library the moment it would become possible to do so.
Since we are developing a desktop environment from the ground up anyway, we decided that there would be much more value for our time if we contribute to the Rust ecosystem and utilize iced to make a fully featured GUI library for application development.
Makes sense, thank you for the detailed answer! By the way, I saw that gtk apps will be automatically themed, is that only gtk3 or also gtk4? Edit: typo
We will be adding integrations to our theme engine to automatically generate themes for GTK3, GTK4, and libadwaita.
Great! Cant wait to try out cosmic, thank you for all the great work you guys have been doing!
Beautiful, so there's a good chance for it to not be a hot mess! Looking forward to it. 😊
I’m really excited to test the Alpha, it’s looking really good so far!
Just curious, on a scale from cowsay to MS Word, how difficult would it be to port COSMIC to the BSDs, assuming wayland support?
As long as you have access to the latest version of Rust, porting would be somewhere near cowsay.
Nice! I know that OpenBSD people have been working on a wayland compatible thing which takes into account Linux-specific things (libinput?), but last I heard it's not ready. I have my hopes up though! Could be the year of desktop BSD if they port COSMIC.
It would certainly be easier for them to port COSMIC because there are very few dependencies on shared C libraries. Cargo links all Rust libraries statically, so it's easier to maintain and update components. This will depend how open they are to accepting Cargo and Rust into their ecosystems.
OpenBSD -release seems to be at rust 1.72, but -current has 1.75.
https://openbsd.app/?search=rust¤t=on
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