I encountered this exact situation in a medium-sized app I've written. I just handled the issue in the update function; when I sent a Toggle message to the footer I would also set everything else to Hidden. I think it worked fine for my case, but I guess in a large application written by lots of people the only way to make sure of this would be writing a comment and pinky swear not to ever change that component's state with other messages. So yeah, I'm not sure there's a way to handle this at type level in Elm without making things too complicated.
I remember reading about behavioural types (http://www.behavioural-types.eu/), I don't fully understand them but I think this problem could possibly be a good fit for them? Not that there's any language that implements them yet. -- You received this message because you are subscribed to the Google Groups "Elm Discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to elm-discuss+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
