macos: floating window support

[rawnly]

Added ToggleFloatingWindow on macos.
Tested on macOS Sonoma (14.0)

Demo

CleanShot.2023-11-12.at.16.14.33.mp4

fixes #4566

[rawnly]

any feedback on this? @wez

[wez]

Thanks for diving in!

I think this PR needs to consider all platforms; both X11 and Windows have an AlwaysOnTop concept, so the configuration and actions need to expand and be ready for that, even if you're not in a position to implement and test for those platforms yourself.

I've made some suggestions with that in mind for your macOS implementation.

I think you could probably get close to making this work on windows and perhaps also X11 if you took a peek at the equivalent functionality in the winit crate. I'm not going to require that you do both of these in this PR, but it would be very helpful if you could take a crack at making it compile there via the CI as a kind of first-pass at that.

• https://github.com/rust-windowing/winit/blob/b3c87caa7c040111d8dcae764fe903f54df77426/src/platform_impl/linux/x11/window.rs#L1135
• https://github.com/rust-windowing/winit/blob/b3c87caa7c040111d8dcae764fe903f54df77426/src/platform_impl/windows/window.rs#L843

[rawnly]

Thanks for the review I'll have a look at it asap!

[rawnly]

Thanks for the feedback, I applied the changes as you suggested, now there are 3 ways to set levels, via SetLevel and via ToggleAlwaysOn...

I moved the WindowLevel inside the config crate on a separate mod (window) to be more clean

[rawnly]

i left docs for the so i don't have to write them again every time 😅

[rawnly]

it should be everything fine for the CI :)

[wez]

Thanks; just a couple of minor things remain here for macOS!

[rawnly]

any feedback so far?

[rawnly]

@wez ?

[wez]

Thanks!