def start_filtering(
evdev: Device, filter: Callable[[InputEvent],
Union[InputEvent, None]]) -> NoReturn:
"""Start filtering input from a device."""
# grab the device to ourselves - now only we see the events it emits
evdev.grab()
# create a copy of the device that we can write to - this will emit the filtered events to anyone who listens
uidev = evdev.create_uinput_device()
while True:
# since the descriptor is blocking, this blocks until there are events available
for e in evdev.events():
if (f := filter(e)) is not None:
send_event_packet(uidev, f)
events = [
InputEvent(EV_KEY.KEY_NUMLOCK, 0),
InputEvent(EV_SYN.SYN_REPORT, 0)
]
udev.send_events(events)
d_t.ungrab()
subprocess.call(offCmd, shell=True)
numlock = False
# Process events while running #
while True:
# If keyboard sends numlock event with F8 key tap, enable/disable touchpad events #
for e in d_k.events():
if e.matches(EV_KEY.KEY_F8) and e.value == 1:
numlock = not numlock
if numlock:
activate_numlock()
else:
deactivate_numlock()
# If touchpad sends tap events, convert x/y position to numlock key and send it #
for e in d_t.events():
# ignore others events, except position and finger events
if not (e.matches(EV_ABS.ABS_MT_POSITION_X)
or e.matches(EV_ABS.ABS_MT_POSITION_Y)
or e.matches(EV_KEY.BTN_TOOL_FINGER)):
continue
brightness] + " 0xad"
subprocess.call(numpad_cmd, shell=True)
return brightness
# Run - process and act on events
numlock: bool = False
pos_x: int = 0
pos_y: int = 0
button_pressed: libevdev.const = None
brightness: int = 0
while True:
# If touchpad sends tap events, convert x/y position to numlock key and send it #
for e in d_t.events():
# ignore others events, except position and finger events
if not (e.matches(EV_ABS.ABS_MT_POSITION_X)
or e.matches(EV_ABS.ABS_MT_POSITION_Y)
or e.matches(EV_KEY.BTN_TOOL_FINGER)):
continue
# Get x position #
if e.matches(EV_ABS.ABS_MT_POSITION_X):
x = e.value
continue
# Get y position #
if e.matches(EV_ABS.ABS_MT_POSITION_Y):
y = e.value