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Internally, these closures are simply stored as FnMut in a Vec, exactly here, to be retrieved and called when the event itself happens.
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I would say channels. In this case, a single producer, multiple consumer (spmc) broadcast channel, like bus. I can't vouch for this library, but it seems to do what you're looking for
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For example, a button click, where self.wnd is the parent window, looks like this:
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I used this pattern in my C++ lib, and I just translated it to Rust idioms. The trickiest part is working under Rust's ownership system – the borrow checker is really unforgiving.