macOS: trackpad touch events

Question

macOS: trackpad touch events

shaunlebron opened this issue 2 years ago · comments

shaun commented 2 years ago

Looking at adding access to macOS trackpad touch events. Some references to start:

Magic: an example mac app that uses trackpad touch events for drawing
docs on macos touch events
edit: docs on web touch events
edit: how SDL tracks touch events on macOS

Nikita Prokopov · Answer 1 · Thu Nov 24 2022 23:12:05 GMT+0800 (China Standard Time)

I think web api should be studied for this too

shaun · Answer 2 · Mon Nov 28 2022 12:38:45 GMT+0800 (China Standard Time)

setAcceptsTouchEvents:YES seems to be deprecated for allowedTouchTypes. I had to find a usage example on GitHub.

The acceptsTouchEvents property also seemed necessary. Does Apple have newer docs on this?

I confirmed that the touch events are being caught now (see 49a4483). I will look at logging the touch event data to the window.

shaun · Answer 3 · Tue Nov 29 2022 15:56:35 GMT+0800 (China Standard Time)

I added EventTrackpadTouch* events and the dashboard event panel is logging them successfully. I will look at drawing the touch points in a new trackpad panel.

Nikita Prokopov · Answer 4 · Thu Dec 01 2022 03:54:55 GMT+0800 (China Standard Time)

That would be cool!

shaun · Answer 5 · Fri Dec 02 2022 03:38:08 GMT+0800 (China Standard Time)

I put a trackpad panel next to the mouse panel:

CleanShot.2022-12-01.at.13.27.59.mp4

Problems so far:

The dashboard starts hiccuping when I move the touch points too quickly. Not sure what’s going on there.
Touch point state goes out of sync if you use a four-finger gesture that exits the view (swipe up, down, out or in). Not sure how to get external touch events to keep those in sync.