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I want a display manager that shows the desktop as the background, instead of a background image or video. I'm thinking of auto-logging in on boot, and adding another startup command to Hyprland to lock the desktop and show the display manger. My searches didn't yield anything. The closest I could find is hyprlock which blurs the desktop, but that's just a lock screen & not a proper display manager.
what you are asking for doesn't really make sense.
a display manager is for running when no user is logged in. its purpose is to log in and start your session. thats why they can't show a desktop as a background because ot isn't running yet. once you log in the display manager quits because its job is done.
u could use an custom bash file that screenshots ur desktops, blurs it, and then sources it as ur lockscreen from a config file, in bash it could go:
#!/usr/bin/env bash
bg=~/.lockscreen.png
grim -o $bg
convert $bg -blur 0x8 $bg
hyprlock
rm $bg
havent tried it yet, but as long as ur sourcing the ~/.lockscreen.png on ur config file, or u launch ur locking program with an argument to use whatever u used as a background (and that way u can use mktmp instead of throwing it on ur home folder) it should work. Just try the commands b4 executing it since i wrote this from my bed on a saturday and my brain is half working.
i just used hyprlock as an example, since u said ur using hyprland, but u can use whatever ofc, I myself use swaylock.
You may screenshot the desktop after login and use it as a background, but I don't think it will be exactly the same
Youre looking for a lockscreen. like people have suggested, id say the sweetest way is writing your own simple script. For example, take a look at my lockscreen script to get a feeling of things.
your can take a screenshot of the screen and blur it and set it as background each time.