Forum Debian Users Gang

xinput --list-props 9
Device 'A4Tech PS/2+USB Mouse':
        Device Enabled (173):   1
        Coordinate Transformation Matrix (175): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        libinput Natural Scrolling Enabled (310):       0
        libinput Natural Scrolling Enabled Default (311):       0
        libinput Scroll Methods Available (312):        0, 0, 1
        libinput Scroll Method Enabled (313):   0, 0, 0
        libinput Scroll Method Enabled Default (314):   0, 0, 0
        libinput Button Scrolling Button (315): 2
        libinput Button Scrolling Button Default (316): 2
        libinput Middle Emulation Enabled (317):        0
        libinput Middle Emulation Enabled Default (318):        0
        libinput Accel Speed (319):     0.000000
        libinput Accel Speed Default (320):     0.000000
        libinput Accel Profiles Available (321):        1, 1
        libinput Accel Profile Enabled (322):   1, 0
        libinput Accel Profile Enabled Default (323):   1, 0
        libinput Left Handed Enabled (324):     0
        libinput Left Handed Enabled Default (325):     0
        libinput Send Events Modes Available (295):     1, 0
        libinput Send Events Mode Enabled (296):        0, 0
        libinput Send Events Mode Enabled Default (297):        0, 0
        Device Node (298):      "/dev/input/event5"
        Device Product ID (299):        2522, 6
        libinput Drag Lock Buttons (326):       <no items>
        libinput Horizontal Scroll Enabled (327):       1

#!/usr/bin/env python3

import evdev, time, select
from evdev import ecodes
import fcntl

fh=open(__file__,'r')
try:
    fcntl.flock(fh,fcntl.LOCK_EX|fcntl.LOCK_NB)
except:
    exit(0)

def getEvDevMouse():
    for fn in evdev.list_devices():
        dev=evdev.InputDevice(fn)
        capa=dev.capabilities(absinfo=False)
        if capa.get(ecodes.EV_REL):
            return dev
    return None

mouse = getEvDevMouse()
if not mouse:
    exit(1)

ui = evdev.UInput.from_device(mouse)
if not ui:
    exit(1)
mouse.grab()
ctrl = 0
last_timestamp = 0
kev_timestamp = 0
pending=[0,0]
def pend(now):
    if not now and pending[1] > 0 and pending[1] > time.time() - 1:
        return
    if pending[1]:
        ui.write(ecodes.EV_KEY, ecodes.BTN_MIDDLE, 1)
        pending[1] = 0
        ui.syn()
    if pending[0]:
        time.sleep(0.1)
        ui.write(ecodes.EV_KEY, ecodes.BTN_MIDDLE, 0)
        pending[0] = 0
        ui.syn()
    
        
while True:
    r,w,s = select.select([mouse.fd],[],[],0.1)
    ui.syn()
    if r:
        locked = False
        eve=mouse.read()
        for ev in eve:
            if not ev:
                break
            kev = evdev.categorize(ev)
            if isinstance(kev, evdev.KeyEvent):
                keycode = kev.keycode
                keystate = kev.keystate
                if kev.keycode == 'BTN_MIDDLE':
                    if last_timestamp > ev.timestamp()-2:
                        if kev.keystate:
                            locked=True
                    else:
                        if kev.keystate:
                            pending[1]=ev.timestamp()
                            locked=True
                        elif pending[1]:
                            pending[0]=ev.timestamp()
                            locked=True
                        kev_timestamp = ev.timestamp()
            if isinstance(kev, evdev.RelEvent):
                if ev.code == 8:
                    last_timestamp = ev.timestamp()
                    pending[0]=0
                    pending[1]=0
                    kev_timestamp = 0
                elif ev.code != 11:
                    pend(True)
            if not locked:
                pend(False)
                ui.write_event(ev)
                ui.syn()
            else:
                locked = False
    pend(False)
    
mouse.ungrab()
exit(0)