input::ffi

Function libinput_event_touch_get_slot

pub unsafe extern "C" fn libinput_event_touch_get_slot(
    event: *mut libinput_event_touch,
) -> i32
Expand description

@ingroup event_touch

Get the slot of this touch event. See the kernel’s multitouch protocol B documentation for more information.

If the touch event has no assigned slot, for example if it is from a single touch device, this function returns -1.

For events not of type @ref LIBINPUT_EVENT_TOUCH_DOWN, @ref LIBINPUT_EVENT_TOUCH_UP, @ref LIBINPUT_EVENT_TOUCH_MOTION or @ref LIBINPUT_EVENT_TOUCH_CANCEL, this function returns 0.

@note It is an application bug to call this function for events of type other than @ref LIBINPUT_EVENT_TOUCH_DOWN, @ref LIBINPUT_EVENT_TOUCH_UP, @ref LIBINPUT_EVENT_TOUCH_MOTION or @ref LIBINPUT_EVENT_TOUCH_CANCEL.

@return The slot of this touch event