I've also been reading your source out of interest (and time ;)). Must say you have quite a consistent style, and you found a good balance what concerns writing

I've also been reading your source out of interest (and time ;)). Must say you have quite a consistent style, and you found a good balance what concerns writing comments. Not an OO connaisseur myself, what I'm a bit puzzled about are the long conditional constructs in on_press() and on_release(). Partly it seems to handle mapping of specific keys that might not exist in all layouts, but is the rest needed because of conversion between different classes that encode keys?