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      It look me a minute to grok the C++ doing C stuff but it’s a neat project.

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      Fun exploration of the api, but worth noting on X there’s two other ways to do this too: enable the built in pointerkeys feature https://wiki.archlinux.org/title/Accessibility#Mouse_keys or to use the XInput and XTest extensions to fetch a particular keyboard and send virtual mouse commands.

      I’ve used XTest to turn a gamepad into a keyboard+mouse before, it felt like a good idea when my wrist was sore but i found it too awkward to actually use.

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      I recently bought this device:


      Which has a mainline QMK firmware implementation available. I could plug it into a Windows PC and also have mouse keys work there. The great thing is that I’ve programmed the various knobs up the top to act as scroll wheels.