input-remapper/keymapper/injection/readme.md

Injection

This folder contains all classes that are only relevant for the injection process. There is one process for each device that is being injected for, and one context object that is being passed around everywhere for all to use.

The benefit of the context object over regular parameters is that the same parameters don't have to be passed to classes and stored redundantly all the time. The context is like the processes global configuration and you can use whatever is inside. Just don't modify it. If you access a context member in two classes you definitely know that those two are working with the same thing without having to rely on scattering your pointers everywhere.