lightdm-mobile-greeter/lightdm-mobile-greeter.py

#!/usr/bin/python3
import gi
from gi.repository import Gtk, Gdk, Handy, LightDM
import json


class Config:
    def __init__(self):
        with open("/etc/lightdm_mobile_greeter.json") as f:
            j = json.load(f)
        self.user = j["user"]


class Handler:
    def __init__(self, builder: Gtk.Builder):
        self.pin_entry = builder.get_object("entry_buffer")
        self.greeter = LightDM.Greeter()
        self.greeter.connect("authentication-complete", self.auth_complete)
        self.greeter.connect("show-message", self.show_msg)
        self.greeter.connect("show-prompt", self.show_prompt)
        self.pmpt_label = builder.get_object("prompt_label")
        self.msg_label = builder.get_object("message_label")
        self.de_select = builder.get_object("de_select")
        vbox = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, visible=True)
        self.de_select.add(vbox)
        self.greeter.connect_sync()
        self.conf = Config()
        self.greeter.authenticate(self.conf.user)
        self.session = self.greeter.get_default_session_hint()
        sessions = iter([(s.get_name(), s.get_key()) for s in LightDM.get_sessions()])
        name, key = sessions.__next__()
        first = Gtk.RadioButton.new_with_label(None, name)
        first.connect("toggled", self.session_change, key)
        vbox.add(first)
        for name, key in sessions:
            rb = Gtk.RadioButton.new_with_label_from_widget(first, name)
            rb.connect("toggled", self.session_change, key)
            vbox.add(rb)
            if self.session == key:
                rb.set_active(True)
        vbox.show_all()

    def session_change(self, rb, key):
        self.session = key

    def on_destry(self, window):
        Gtk.main_quit()

    def login_cb(self, login_btn):
        self.greeter.respond(self.pin_entry.get_text())
        self.pin_entry.set_text("", 0)

    def backspace(self, del_btn):
        length = self.pin_entry.get_length()
        if length <= 0:
            return
        self.pin_entry.delete_text(length - 1, 1)

    def auth_complete(self, greeter):
        if greeter.get_is_authenticated():
            greeter.start_session_sync(self.session)
        else:
            greeter.authenticate(self.conf.user)

    def show_msg(self, greeter, text, type):
        self.msg_label.set_text(text)

    def show_prompt(self, greeter, text, type):
        self.pmpt_label.set_text(text)

    def de_popover(self, settings_btn):
        self.de_select.popup()


Handy.Keypad()
builder: Gtk.Builder = Gtk.Builder.new_from_file(
    "%DATADIR%/lightdm-mobile-greeter/interface.ui"
)
handler = Handler(builder)
builder.connect_signals(handler)
window: Gtk.Window = builder.get_object("greeter_window")
display = Gdk.Display.get_default()
monitor = display.get_monitor(0)
screen_size = monitor.get_geometry()
window.set_size_request(screen_size.width, screen_size.height)
container = builder.get_object("container")
container.set_size_request(screen_size.width * 0.8, screen_size.height * 0.8)
style: Gtk.CssProvider = Gtk.CssProvider()
style.load_from_path("%DATADIR%/lightdm-mobile-greeter/style.css")
Gtk.StyleContext.add_provider_for_screen(
    Gdk.Screen.get_default(), style, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
)
window.show()
Gtk.main()