def wheel_delta_discrete(self):
		"""The delta for the wheel in discrete steps (e.g. wheel clicks) and
		whether it has changed in this event.

		Returns:
			(int, bool): The delta of the wheel, in discrete steps, compared to
			the last event and whether it has changed.
		"""

		delta =  self._libinput. \
			libinput_event_tablet_tool_get_wheel_delta_discrete(self._handle)
		changed = self._libinput.libinput_event_tablet_tool_wheel_has_changed(
			self._handle)
		return delta, changed