#!/usr/bin/python3

import sys
import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
import os

class AppWindow(Gtk.ApplicationWindow):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.set_border_width(10)
        prompt_str = "What is the password for " + os.getlogin() + "?"
        question = Gtk.Label(prompt_str)
        label = Gtk.Label("Password:")
        passwd = Gtk.Entry()
        passwd.set_visibility(False)
        passwd.set_invisible_char("*")
        hbox = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL, spacing=0)
        hbox.pack_start(label, False, False, 5)
        hbox.pack_start(passwd, False, False, 5)
        vbox = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=0)
        vbox.pack_start(question, False, False, 0)
        vbox.pack_start(hbox, False, False, 0)
        self.add(vbox)

class Application(Gtk.Application):

    def __init__(self, *args, **kwargs):
        super().__init__(*args, application_id="org.example.myapp",
                         **kwargs)
        self.window = None

    def do_activate(self):
        if not self.window:
            self.window = AppWindow(application=self, title="Password")
        self.window.show_all()
        self.window.present()

if __name__ == "__main__":
    app = Application()
    app.run(sys.argv)