More Cursors

[maan2003]

This adds pointer and busy cursors. I have only tested this on linux(gtk).

[cmyr]

The cursors that are currently available represent the set of cursors that are implemented on all of our major platforms. I'm not sure how best to expose cursors that are only available on some platforms. I do agree that this would be nice, but I would like to be principled about it.

One option might be to have separate PlatformCursor enums that describe cursors that are platform specific, and then maybe have a Cursor::Platform variant in the main Cursor enum? PlatformCursor would only be exported if the appropriate target_os/feature, but this is sort of fragile because of gtk/x11.

what we really want is some way to do like if cfg(target_backend = "gtk")`, but that doesn't exist. I'm not sure what to suggest, otherwise...

[maan2003]

So, adding Cursor::Pointer should be Ok. Also, I think Cursor::OpenHand is not available on windows.

Cursor::Busy is a fundamental cursor IMO 🤷 . How do browsers handle it on Mac OS?

[cmyr]

I think macOS only shows the spinner when the main thread is blocked or something?

[cmyr]

As far as I can tell there is no pointing hand cursor on windows: (see docs here?)

[maan2003]

As far as I can tell there is no pointing hand cursor on windows: (see docs here?)

I think IDC_HAND is the pointing hand cursor,
see https://docs.microsoft.com/en-us/windows/win32/menurc/about-cursors#the-mouse-and-the-cursor

For example, when the cursor crosses over a hyperlink, the system changes the cursor from an arrow to a hand.

[cmyr]

Hmm okay, so there's no open hand, for dragging?

[maan2003]

yeah, no open hand 🤕

[maan2003]

Ready for review. I have removed the busy cursor. Also, I am not sure about CI failure.

[totsteps]

Tested on macOS and Windows 10. Works like a charm.

[cmyr]

Looks good!

[cmyr]

yea, can we open an issue here? Not sure what the best solution is, I'd probably prefer to deprecate the open hand from this enum. 😢