Key Event

gistfile1.txt

import evdev
from evdev import KeyEvent, InputDevice
class KeyListener:
    pressed_keys = [False] * 256

    UP = evdev.ecodes.KEY_UP
    DOWN = evdev.ecodes.KEY_DOWN
    LEFT = evdev.ecodes.KEY_LEFT
    RIGHT = evdev.ecodes.KEY_RIGHT
    SPACE = evdev.ecodes.KEY_SPACE
    ESC = evdev.ecodes.KEY_ESC
    LEFTCTRL = evdev.ecodes.KEY_LEFTCTRL
    LEFTSHIFT = evdev.ecodes.KEY_LEFTSHIFT

    def __init__(self):
        self.initialize_device()

    def press(self, key):
        self.pressed_keys[key] = True

    def release(self, key):
        self.pressed_keys[key] = False

    def react(self, keyEvent):
        if keyEvent.keystate == keyEvent.key_down:
            self.press(keyEvent.scancode)
        if keyEvent.keystate == keyEvent.key_up:
            self.release(keyEvent.scancode)

    def initialize_device(self):
        devices = [InputDevice(fn) for fn in evdev.list_devices()]
        keyboard_port = filter(lambda device: "keyboard" in device.name, devices)[0].fn
        self.device = InputDevice(keyboard_port)

    def read(self):
        event = self.device.read_one()
        if not event is None and event.type == evdev.ecodes.EV_KEY:
            self.react(evdev.categorize(event))
        return self.pressed_keys


class Pepe:
    def is_shutdown(self):
        return False

rospy = Pepe()
keyListener = KeyListener()

import time
isLaunched = False

while not rospy.is_shutdown():
    pressed_keys = keyListener.read()
    if(pressed_keys[keyListener.SPACE] and not isLaunched):
        isLaunched = True
        print("Take Off!")
    if(pressed_keys[keyListener.ESC] and isLaunched):
        isLaunched = False
        print("Landing!")
    if(pressed_keys[keyListener.UP]):
        print("We are going forward!")
    if(pressed_keys[keyListener.DOWN]):
        print("We are going backward")
    if(pressed_keys[keyListener.LEFT]):
        print("You spin me round baby (LEFT)")
    if(pressed_keys[keyListener.RIGHT]):
        print("You spin me round baby (RIGHT)")
    if(pressed_keys[keyListener.LEFTSHIFT]):
        print("We are going UP!")
    if(pressed_keys[keyListener.LEFTCTRL]):
        print("May day may day we are going DOWN!")