libei/examples/libei-client.pseudo

# This is pseudocode, illustrating a libei client implementation

function main():
    ctx = ei_new()
    ei_portal_connect(ctx)

    # let's say this is a blocking wait
    event = ei_get_event();
    if ei_event_get_type(event) == EI_EVENT_TYPE_DISCONNECT:
        print("Sorry, server denied us")
        return

    # Could also create one device here with both caps
    ptr = ei_create_device(ctx, CAP_POINTER, "pseudopointer");
    kbd = ei_create_device(ctx, CAP_KEYBOARD, "pseudokeyboard");
    keymap_fd = compile_keymap("us", "dvorak")
    ei_device_keyboard_set_keymap(kbd, FORMAT_XKB, keymap_fd);

    event = ei_get_event()
    device = ei_event_get_device()
    if ei_event_get_type(event) == EI_EVENT_TYPE_DEVICE_ADDED:
        if device == ptr:
            # The server may not use the name we suggested but it does
            # tell us the chosen name
            print("Pointer was created: %s", ei_device_get_name(device))
        else:
            print("Keyboard was created: %s", ei_device_get_name(device))
    else if ei_event_get_type(event) == EI_EVENT_TYPE_DEVICE_REMOVED:
        if device == ptr:
            print("We're not allowed a pointer device")
        elif device == kbd:
            print("We're not allowed a keyboard device")


    # Our devices start in suspended mode
    suspended = True

    while True:
        poll(ei_get_fd()):
        if suspended:
            wait_for_event(EI_EVENT_POINTER_RESUME or
                           EI_EVENT_KEYBOARD_RESUME)
            suspended = False
            continue

        event = ei_get_event();
        handler = functions[ei_event_get_type(event)]
        handler(event)

    ei_disconnect(ctx)


function event_disconnect(event):
    print("Ooops, the server kicked us off")
    ei_unref(ctx);
    sys.exit(1)


function event_keyboard_keymap(event):
    # see README comments
    keymap_fd = ei_event_keyboard_get_keymap(event))
    recompile_macros(keymap_fd)


# Called by our actual application to emulate input
function move_pointer(x, y):
    ei_device_pointer_motion(ptr, x, y)


function macro(macro):
    for key in macro:
        ei_device_keyboard_key(kbd, key, true)
        msleep(12);  # fake an interval
        ei_device_keyboard_key(kbd, key, false)
        msleep(12);  # fake an interval