Enable scrollwheel-click to scroll via dragging und X11 (requires python lib plumbum and linux binary xinput)

mousewheeldragscrollX11.py

from plumbum import local


class Candidate:

	name = ""
	id = -1

	def __init__(self, name, id):
		self.name = name
		self.id = id


def main():

	x = None

	try:
		x = local["xinput"]
	except:
		print("Command xinput is not installed")

	if x is None:
		exit(1)

	r, stdout, stderr = x.run(["list"], retcode=None)
	if r != 0:
		raise Exception("xinput failed")

	lines = stdout.split("\n")
	candidates = []

	b = b'\xe2\x86\xb3'
	n = 1
	for line in lines:
		if line.lower().find("pointer") > -1:
			stupidlbchar = line.find(b.decode())
			if stupidlbchar > -1:
				line = str(n) + ") " + line[stupidlbchar+1:].strip()
				parenpos = line.find(")")
				if parenpos == -1:
					continue

				tabpos = line.find("\t")

				if tabpos == -1:
					continue
				cn = line[parenpos+2:tabpos].strip()
				idpos = line.find("id", tabpos)
				parenpos = line.find("[", idpos + 3)
				id = line[idpos+3:parenpos].strip()
				candidates.append(Candidate(cn, int(id)))
				n += 1

	candidate_count = len(candidates)

	if candidate_count == 0:
		raise Exception("No mouse-devices found")

	for c in candidates:
		# print(c.name)

		if \
			c.name.find("2.4G Mouse") > -1 or \
			c.name.find("2.4G Wireless Mouse") > -1 or \
			c.name.find("CX 2.4G Receiver Mouse") > -1 or \
			c.name.find("Logitech Wireless Mouse") > -1:

			lrc, lro, lre = x["--list-props", c.id].run(retcode=None)
			
			if lrc != 0:
				raise Exception(lre)

			for line in lro.splitlines():
				if line.find("libinput Scroll Method Enabled (") > -1:
					parenpos = line.find("(")
					parenpos2 = line.find(")")
					if parenpos > -1 and parenpos2 > -1:
						methid = int(line[parenpos+1:parenpos2])
						lrc2, ro, lre2 = x["set-int-prop", str(c.id), str(methid), "8", "0", "0", "1"].run(retcode=None)
						if lrc2 != 0:
							raise Exception(lre2)

	return 0


if __name__ == "__main__":
	rc = 0
	err = ""
	try:
		rc = main()
	except SystemExit as e1:
		err = str(e1)
		i = 0
		try:
			i = int(err)
		except ValueError:
			i = 2
		rc = i
	except Exception as e2:
		i = 3
		err = str(e2)

	if rc != 0:
		print("Error:\nerrcode: {}\nerrmessage: {}".format(rc, err))

	exit(rc)