One of my friends started at my workplace. We work in an open office area and because of that I bought over ear earphones. It's generally accepted that when someone is wearing them they're trying to work.

My friend keeps coming over for a chat. Like not just a short one she fully sits down next to me.

I'm on a deadline so I think I'll just be straightforward and tell her that if my headphones are on I don't want a chat. Seems reasonable but I hate having these kinds of conversations...