Virtual Keyboard With Chords POC

virtual-keyboad-chords.py

import threading
import time
from evdev import UInput, InputDevice,categorize, ecodes
from copy import copy

myKey = UInput.from_device('/dev/input/event2', name='MyKeyboard')
dev = InputDevice('/dev/input/event2')

events = []
waiting = False

def flush():
    global events
    global waiting
    find_l = False
    find_p = False
    done = False
    for event in events:
        if event.code == ecodes.ecodes['KEY_P']:
            find_p = True
        elif event.code == ecodes.ecodes['KEY_L']:
            find_l = True
    for event in events:
        if event.code == ecodes.ecodes['KEY_P'] and find_l and not done:
            ctrl = copy(event)
            ctrl.code = ecodes.ecodes['KEY_Z']
            myKey.write_event(ctrl)
            myKey.syn()
            done = True
        elif event.code == ecodes.ecodes['KEY_L'] and find_p and not done:
            ctrl = copy(event)
            ctrl.code = ecodes.ecodes['KEY_Z']
            myKey.write_event(ctrl)
            myKey.syn()
            done = True
        elif not done:
            myKey.write_event(event)
            myKey.syn()
    events = []
    waiting = False

for event in dev.read_loop():
    if waiting:
        events.append(event)
    else:
        if event.code == ecodes.ecodes['KEY_P']:
            events.append(event)
            threading.Timer(0.025, flush).start()
            waiting = True
        elif event.code == ecodes.ecodes['KEY_L']:
            events.append(event)
            threading.Timer(0.025, flush).start()
            waiting = True
        else:
            myKey.write_event(event)
            myKey.syn()