[WIP] MacOS inputcapture

[meck]

I had a stab at writing a macos input capture module as i was tired not being able to cross the pointer back and forth between mac and linux, and it seemed a good rust exercise. There as some things left mainly modifier handling and updating the bounds on a monitor config change. But i wanted to put it up as a draft for now if there is any other pointers or if i missed something in the architecture.

[feschber]

Very nice, thank you! Unfortunately my MacOS VM nuked itself so I will have to set that up again before I can test this... Sorry about thay

[rohitsangwan01]

Works for me

[feschber]

Are you sure about the / 2.0 part?

The documentation for CGWarpMouseCursorPosition states: "You can use this function to “warp” or alter the cursor position without generating or posting an event. For example, this function is often used to move the cursor position back to the center of the screen by games that do not want the cursor pinned by display edges."

So no event should be generated, if I understand that correctly.

Apparently it works like this though?

[meck]

Yes, no synthetic event is produced, however the movement delta is tacked onto the next event. This explains the issue https://stackoverflow.com/questions/40904830/constrain-mouse-movement-to-region-in-os-x-without-jitter/40922095#40922095

[feschber]

And just FYI: I'm still debating on whether or not Modifier events should even be handled "server side" at all.
The only backend that currently reports them is the wayland / layershell backend and similarly the only emulation backend that needs modifier events is the wlroots one.
Still good to have them but they also dont work in Windows and Libei Input Captures (even though libei should report them but apparently does not do so)

[meck]

I see, im using Hyprland so wayland/wlroots is what im using. I guess removing the events would mean tracking modifier state in wlroots emulation.

[feschber]

I see, im using Hyprland so wayland/wlroots is what im using. I guess removing the events would mean tracking modifier state in wlroots emulation.

Yeah exactly. Definitely keep it in though! Better to have it working in MacOS now.

[meck]

I hope to get back to this soon, haven't had the time, the only thing i wanted to add was detection of monitor layout changes, there is a API in CGDisplayRegisterReconfigurationCallback however it needs a CFRunLoop to run on the main thread for the callback to actually be called, That would mean a lot of architectural changes to rest of the project so I'm looking for alternatives.

[feschber]

no worries! I just got round to testing this. One thing I'm noticing is that the mouse is behaving weird when dragging:
When I press the mouse down and drag it to the left and then release the mouse button, while the mouse is still moving, the mouse jumps back to its original position.