version 2 maybe?

LICENCE

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+MIT License
+
+Copyright (c) 2020 Raatty
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

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+PREFIX ?= /usr/local
+BINDIR ?= $(PREFIX)/bin
+DATADIR ?= $(PREFIX)/share
+CONFDIR = /etc
+
+install:
+	sed "s#%DATADIR%#$(DATADIR)#" lightdm-mobile-greeter.py > lightdm-mobile-greeter
+	install -Dm755 lightdm-mobile-greeter -t $(DESTDIR)$(BINDIR)
+	install -Dm644 style.css interface.ui -t $(DESTDIR)$(DATADIR)/lightdm-mobile-greeter
+	install -Dm644 lightdm-mobile-greeter.desktop -t $(DESTDIR)$(DATADIR)/xgreeters

README.md

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+# Lightdm mobile greeter
+
+A simple log in screen for use on touch screens, designed for use on postmarketOS but should work for others too.
+
+## Installing
+```
+make install
+```
+## Configuring
+/etc/lightdm_mobile_greeter.json
+```json
+{"user":"<YOUR USERNAME HERE>"}
+```
+
+lightdm.conf
+```
+greeter-session=lightdm-mobile-greeter
+user-session=<THE CHOSEN DE TO LAUNCH AFTER SUCCESSFUL LOGIN>
+```

interface.ui

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+<?xml version="1.0" encoding="UTF-8"?>
+<interface>
+  <requires lib="gtk+" version="3.20"/>
+  <requires lib="libhandy" version="0.0"/>
+  <object class="GtkWindow" id="greeter_window">
+    <signal name="destroy" handler="on_destry"/>
+    <child>
+      <object class="GtkScrolledWindow">
+        <property name="visible">True</property>
+        <child>
+          <object class="GtkViewport">
+            <property name="visible">True</property>
+            <child>
+              <object class="GtkBox" id="container">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="orientation">vertical</property>
+                <property name="halign">center</property>
+                <property name="valign">center</property>
+                <property name="spacing">12</property>
+                <child>
+                  <object class="GtkLabel" id="prompt_label">
+                      <property name="visible">True</property>
+                      <property name="label">prompt label</property>
+                      <style>
+                        <class name="prompt" />
+                      </style>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkEntry" id="pin_entry">
+                    <property name="visible">True</property>
+                    <property name="can_focus">True</property>
+                    <property name="has_frame">False</property>
+                    <property name="margin_top">12</property>
+                    <property name="margin_bottom">12</property>
+                    <property name="visibility">False</property>
+                    <property name="buffer">entry_buffer</property>
+                    <property name="input_purpose">GTK_INPUT_PURPOSE_PIN</property>
+                    <property name="xalign">0.5</property>
+                    <property name="caps_lock_warning">False</property>
+                    <property name="hexpand">True</property>
+                    <property name="vexpand">True</property>
+                    <style>
+                      <class name="pin" />
+                    </style>
+                  </object>
+                </child>
+                <child>
+                  <object class="HdyKeypad">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="halign">fill</property>
+                    <property name="valign">fill</property>
+                    <property name="margin_top">12</property>
+                    <property name="margin_bottom">12</property>
+                    <property name="only_digits">True</property>
+                    <property name="show_symbols">False</property>
+                    <property name="right_action">delete_btn</property>
+                    <property name="left_action">settings_btn</property>
+                    <property name="entry">pin_entry</property>
+                    <style>
+                      <class name="keypad"/>
+                    </style>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkButton">
+                    <property name="visible">True</property>
+                    <property name="label">Login</property>
+                    <signal name="clicked" handler="login_cb"/>
+                    <style>
+                      <class name="login_btn"/>
+                    </style>
+                  </object>
+                </child>
+                <child>
+                  <object class="GtkLabel" id="message_label">
+                      <property name="visible">True</property>
+                      <property name="label"></property>
+                  </object>
+                </child>
+              </object>
+            </child>
+          </object>
+        </child>
+      </object>
+    </child>
+  </object>
+  <object class="GtkEntryBuffer" id="entry_buffer" />
+  <object class="GtkButton" id="delete_btn">
+    <property name="visible">True</property>
+    <property name="can_focus">True</property>
+    <property name="focus-on-click">False</property>
+    <signal name="clicked" handler="backspace"/>
+    <child>
+      <object class="GtkImage">
+        <property name="visible">True</property>
+        <property name="icon_name">edit-clear-symbolic</property>
+        <property name="icon_size">6</property>
+      </object>
+    </child>
+  </object>
+  <object class="GtkButton" id="settings_btn">
+    <property name="visible">True</property>
+    <property name="can_focus">True</property>
+    <property name="focus-on-click">False</property>
+    <signal name="clicked" handler="de_popover"/>
+    <child>
+      <object class="GtkImage">
+        <property name="visible">True</property>
+        <property name="icon_name">applications-system-symbolic</property>
+        <property name="icon_size">6</property>
+      </object>
+    </child>
+  </object>
+  <object class="GtkPopover" id="de_select">
+    <property name="relative_to">settings_btn</property>
+    <property name="position">GTK_POS_RIGHT</property>
+  </object>
+</interface>

lightdm-mobile-greeter

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-#!/usr/bin/python3
-import gi
-
-gi.require_version("Gtk", "3.0")
-gi.require_version("Handy", "0.0")
-#gi.require_version("LightDM", 0.0)
-from gi.repository import Gtk, Handy, LightDM, Gdk
-
-# main window
-window = Gtk.Window()
-window.connect("destroy", Gtk.main_quit)
-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)
-# window.set_resizable(False)
-
-# scrollable view
-scroll = Gtk.ScrolledWindow(visible=True)
-window.add(scroll)
-viewport = Gtk.Viewport(visible=True)
-scroll.add(viewport)
-
-# collomn box
-container = Gtk.Box(
-    visible=True,
-    can_focus=False,
-    orientation="vertical",
-    halign="center",
-    valign="center",
-    hexpand=True,
-    vexpand=True,
-    spacing=12
-)
-container.set_size_request(screen_size.width * 0.9, screen_size.height * 0.9)
-viewport.add(container)
-
-# entry buffer
-entry_buffer = Gtk.EntryBuffer()
-
-
-# backspace
-def backspace(btn):
-    length = entry_buffer.get_length()
-    if length <= 0:
-        # theres no text left to delete
-        return
-    text = entry_buffer.get_text()
-    print(text)
-    entry_buffer.delete_text(length - 1, 1)
-    text2 = entry_buffer.get_text()
-    print(text2)
-
-
-delete_btn = Gtk.Button(visible=True, can_focus=True, focus_on_click=False)
-db_img = Gtk.Image(visible=True, icon_name="edit-clear-symbolic")
-delete_btn.add(db_img)
-delete_btn.connect("clicked", backspace)
-
-# entry
-pin_entry = Gtk.Entry(
-    visible=True,
-    can_focus=False,
-    has_frame=False,
-    margin_top=12,
-    margin_bottom=12,
-    visibility=False,
-    buffer=entry_buffer,
-    input_purpose=Gtk.InputPurpose.PIN,
-    xalign=0.5,
-    caps_lock_warning=False,
-    hexpand=True,
-    vexpand=True,
-)
-container.add(pin_entry)
-
-# keypad
-keypad = Handy.Keypad(
-    visible=True,
-    can_focus=False,
-    halign="fill",
-    valign="fill",
-    margin_top=12,
-    margin_bottom=12,
-    only_digits=True,
-    show_symbols=False,
-    right_action=delete_btn,
-    entry=pin_entry,
-)
-container.add(keypad)
-
-# greeter
-greeter = LightDM.Greeter()
-
-
-def login_clicked(btn):
-#    greeter.authenticate("demo")
-    greeter.respond(pin_entry.get_text())
-    if greeter.get_is_authenticated():
-        greeter.start_session_sync(None)
-
-
-# login button
-login_btn = Gtk.Button(label="Login", visible=True)
-login_btn.connect("clicked", login_clicked)
-container.add(login_btn)
-
-# prompt label
-prompt_label = Gtk.Label(visible=True)
-container.add(prompt_label)
-
-# message label
-message_label = Gtk.Label(visible=True)
-container.add(message_label)
-
-
-greeter.connect(
-    "authentication-complete",
-    lambda g: g.get_is_authenticated() and g.start_session_sync(None),
-)
-greeter.connect("show-message", lambda g, m, pt: message_label.set_text(m))
-greeter.connect("show-prompt", lambda g, m, t: prompt_label.set_text(m))
-greeter.connect_sync()
-greeter.authenticate("demo")
-
-window.show()
-window.fullscreen()
-Gtk.main()

lightdm-mobile-greeter.py

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+#!/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()

style.css

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+window * {
+    background: none;
+    color: greenyellow;
+    box-shadow: none;
+    text-decoration: none;
+}
+
+button {
+    border: none;
+    border-radius: 20em;
+}
+
+window {
+    background-color: black;
+}
+
+label {
+    font-weight: bold;
+}
+
+button:active {
+    background-color: greenyellow;
+    color: black;
+}
+
+button:active label {
+    color: black;
+}
+
+hdykeypad > button label{
+   font-size: 5em;
+   font-weight: bold;
+   padding: 10px;
+}
+
+.login_btn > label {
+    font-size: 2em;
+    background-clip: padding-box;
+    padding: 0.5em;
+}
+
+.pin, .prompt {
+   font-size: 2em;
+}
+
+popover {
+    background-color: black;
+    font-size: 2em;
+}
+
+popover radiobutton {
+    padding: 1em;
+}