Turns out this can be supported quite easily by a patch to grail. The level of support could in principle vary, but this is the current target:
Single finger motion: Can be supported on all devices that report BTN_TOUCH or BTN_TOOL_FINGER, which amounts to just about every device on the market.
Multi-finger tap and drag: A maximum of four fingers supported if the device reports any of BTN_TOOL_DOUBLETAP, BTN_TOOL_TRIPLETAP, BTN_TOOL_QUADTAP.
Pinch and Rotate: Not available using legacy events.
Turns out this can be supported quite easily by a patch to grail. The level of support could in principle vary, but this is the current target:
Single finger motion: Can be supported on all devices that report BTN_TOUCH or BTN_TOOL_FINGER, which amounts to just about every device on the market.
Multi-finger tap and drag: A maximum of four fingers supported if the device reports any of BTN_TOOL_DOUBLETAP, BTN_TOOL_TRIPLETAP, BTN_TOOL_QUADTAP.
Pinch and Rotate: Not available using legacy events.