Global NSEvent listener and some mouse methods

[agg23]

I found that global NSEvent monitoring was not currently implemented, and on further investigation, local monitoring only used a single possible mask value.

This PR introduces a mechanism for handling bitmasks from enums (though I understand if you'd like me to remove it), unblocking the proper implementation of those methods. It also adds the missing event type enum values and a few NSEvent getters (though there are many more still to do).

[agg23]

It would be really nice if these shift values didn't have to be duplicated, though I don't think there's a nice way to do it. Apple assumedly has a set of k* constants that feed both enums.

[ryanmcgrath]

Hmm, one thing I experimented with in the color module was this:

cacao/src/color/appkit_dynamic_color.rs

Lines 27 to 33 in 9f8d946

	#[cfg(target_os = "macos")]
	extern "C" {
	static NSAppearanceNameAqua: id;
	static NSAppearanceNameAccessibilityHighContrastAqua: id;
	static NSAppearanceNameDarkAqua: id;
	static NSAppearanceNameAccessibilityHighContrastDarkAqua: id;
	}

Maybe there's a similar approach here? e.g somehow just pulling in the already linked NSEventMaskLeftMouseDown variant.

[agg23]

I don't think that would work, as enums need consts (basically #define) to set their values, so we would need to pull out the constant from the header. It works that way in your example because those strings aren't true constants.

[ryanmcgrath]

Yeah... you're right about that - was a late night last night so disregard my rambling thoughts. I thought I had encountered and found a workaround for this some years ago but guess I'm misremembering.

This is probably good in its current result to merge then, unless you've got anything else you can think of?

[agg23]

This is fine by me for now.

[ryanmcgrath]

This PR is great and I'm totally down to merge it once we're finished addressing the comments and all (non-iOS) checks pass.

I threw together the initial NSEvent stuff in a rush for demo purposes (the calculator IIRC) and then just never have time to circle back. It's very useful tho so happy to see it!

Thanks!

[ryanmcgrath]

Merged - thanks!