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A COSMIC Thanksgiving
(blog.system76.com)
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this post was submitted on 24 Nov 2023
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Linux
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I've been waiting for this desktop to release patiently. I can't wait to try it. I have one question that I never got to ask anywhere, how is this going to work with the whole Qt/GTK apps? Are things going to look weird like they do on (mostly) Gnome and (sometimes) KDE Plasma?
You’ll likely need something separate that’ll style both of these through the settings, similar to how you would config GTK themes on Plasma, or vice versa. I haven’t checked if they do this on their on yet, but it’ll probably be handled this way eventually. Out of the box, expect any Qt or GTK apps to look like their Breeze and Adwaita defaults look, unless you’ve already changed this on your system
I'd love for one of their devs to announce this or make a video about how it's going to work.
Well GTK does not have theming anymore, though it still needs some way to configure fonts and icon theme.
It technically still does if you use their theming app "Gradience". I use it currently on my laptop. Pretty nifty little app. It still doesn't theme the shell (the panel, the password box.. etc), but it does theme even flatpaks most of the time
Iirc Gradience punches a hole in the flatpak sandbox for xdg-config/gtk-4.0, which usually is in .config. This makes it work and isn't a security problem.
Gnome Shell is unaffected because it doesn't use GTK.
What does it use then?
It uses a custom UI framework, St, using renderer primitives built into the compositor, mutter. Whereas COSMIC is using the same libcosmic library inside the compositor, applets, and desktop applications. Thanks due to our Smithay client toolkit being used to provide a renderer for iced which supports the Wayland layer shell protocol.
So that means themes will cover everything and things will be unified, unlike how the shell is always dark on gnome? (I know they're working on a light mode).
Yes, this can already be seen when configuring a personal theme in the Desktop > Appearances page in COSMIC Settings. Compositor elements, applets, the login and lock screens, and COSMIC applications automatically adjust in realtime to the configuration changes.