Implement `Touch` events for OSX

[tomaka]

Original: rust-windowing/glutin#592

[chances]

Apart from the already existing Touch events, has any progress been made on this front?

I'm particularly interested in AppKit's gesture events. If not, I'd be happy to contribute integrations for gesture events utilizing AppKit's gesture primitives.

[adamnemecek]

What's the situation with this? I'm considering adding this functionality.

[goddessfreya]

You would have to ask @vbogaevsky.

[madsmtm]

I think the closest we're going to get to supporting touch events is #2157, which adds support for trackpad gestures.

At least, as far as I know, Apple doesn't (yet) support touch displays to any further extent than just simulating a cursor (the best alternative I know would be to use an iPad as an external display, called Sidecar, but that uses the trackpad gestures as well, it doesn't have true multi touch support).