Python evdev script for handling BlackWidow V4's command dial (when mapped to horizontal scroll)

blackwidow-dial.py

#!/usr/bin/env python3
import asyncio
import evdev
import evdev.ecodes as ecodes
import openrazer.client
import colorsys


devman = openrazer.client.DeviceManager()
print(devman.devices)
kbd = devman.devices[0]

mouse = evdev.InputDevice("/dev/input/by-id/usb-Razer_Razer_BlackWidow_V4_Pro-if02-event-mouse")
virtual_mouse = evdev.UInput.from_device(mouse, name="virtual-mouse")

mouse.grab()

total_dial = 0

def command_dial(delta):
	global total_dial
	print(f"command_dial({delta})")
	total_dial = total_dial + delta
	col = tuple(x * 255 for x in colorsys.hsv_to_rgb(total_dial % 128 / 128.0, 1, 1))
	for y in range(8):
		for x in range(22):
			kbd.fx.advanced.matrix[y, x] = col
	kbd.fx.advanced.draw()

async def handle_mouse():
	async for event in mouse.async_read_loop():
		if event.type == ecodes.EV_REL and event.code == ecodes.REL_HWHEEL:
			command_dial(event.value)
			
		virtual_mouse.write_event(event)

asyncio.ensure_future(handle_mouse())

event_loop = asyncio.get_event_loop()
event_loop.run_forever()