[GUI] Re: GUIs and events/callbacks

Glynn wrote (snipped)

Does this mechanism allow the toolkit to determine whether an event is being listened for? Or would it force the toolkit to always generate all events just in case it's being listened for? The latter is unacceptable on X.

Yes. You'll see I provided an IO *action* clicked :: Clickable widget => widget -> IO (Event ()) This tells the toolkit to *generate* an event whenever a button (or whatever "widget" is) is clicked. I agree that the alternative, for general GUI events, would be unacceptable.