One-finger click&drag is it missing on all models or specific to mine (Magic Trackpad 2 A1535 / PID_0265)?

[aaalizk]

Hey, first thanks for sorting out the EV cert and signing this properly.

So here's my thing: on my Magic Trackpad (the Lightning one), I can't do a one-finger click-drag, press the physical click, hold it, move a single finger to drag, the macOS way. The only workaround I found is turning off IgnoreButtonFinger, but that breaks the other gestures, so it's not great.
So I ended up prototyping a small opt-in setting AllowButtonHeldSingleFingerMotion (defaults to 0, so nothing changes for anyone unless they turn it on). When it's on, it allows a narrow exception to the pointer lock, only when raw_n == 1 && PrevIsButtonClicked && IsButtonClicked && TipSwitch && same_contact. I patched both paths (USB UMDF + Bluetooth HID filter), tested on Windows 11 over USB and BT, and it gives me the same drag feel as Magic Utilities while keeping the other gestures intact.
Before I clean it up into a PR, two questions:

1. Is one-finger drag missing on other models too, or does the newer USB-C model (A3120) already do it natively?
2. Would you be open to an opt-in option like this? If yes, I'll send a PR. I'd also document a small known limitation honestly, a slight cursor jump can happen if the contact id changes while the button is held, but that's really the existing lock pattern showing through, not something my change introduces.

Either way, thanks again for the work 🙏

[vitoplantamura]

hi,

1. AFAIK the USB-C MT2 is functionally identical to the Lighting MT2. I read somewhere that the USB-C MT2 would support a higher polling rate, but, as far as this project is concerned, they are identical.

BTW, one-finger drag is entirely implemented via software (i.e. in Windows, in its Precision Touchpad implementation).

To enable one finger drag simply uncheck "Ignore input from the finger used to click the force touch button". In this regard, what do you mean when you say that this "breaks the other gestures"? Which gestures in particular?

2. I am generally reluctant to release a new signed version of the driver, unless it is a significant fix/upgrade. This is because unfortunately I don't manage the process of signing the drivers myself and I don't want to disturb the friends who manage it for me beyond what is necessary.

Vito

[sureshppm]

Dear @vitoplantamura Thank you so much for your wonderful effort. This is great help for the people who struggle for good driver.

What he is mentioning is correct. Whether the lighting device or USB-C it may face that issue.. I tested with imbushuo that works fine for the click and drag (whether button clicked and moving finger with clicked or double tap(hold) and move).. I think it's some settings in the driver file.

I used checked This drivers and his method to install that driver. It is also working good.

PS: with your driver.. it often disconnects the connection if I restart the machine. with This works fine.

Kind regards

[vitoplantamura]

hi @sureshppm, If you do these three things in the Control Panel, my driver will behave exactly like imbushuo's: 1) clicking "Do nothing" 2) unchecking "Ignore input from the finger used to click the Force Touch button" 3) unchecking "Ignore input from fingers not touching the trackpad surface" Anyway, disabling only option number 2 above should be enough to enable one finger drag. Vito

[sureshppm]

hi @sureshppm,

If you do these three things in the Control Panel, my driver will behave
exactly like imbushuo's:

1. clicking "Do nothing"

2. unchecking "Ignore input from the finger used to click the Force Touch
   button"

3. unchecking "Ignore input from fingers not touching the trackpad surface"

Anyway, disabling only option number 2 above should be enough to enable one
finger drag.

Vito

Wonderful.. I was struggling with different problem.. I just removed the Bluetooth device (before that I removed the TP though bluetooth settings).... Then reconnected bluetooth device then connected the TP..

Now everything works great. Thank you so much for the wonderful effort for the human society.