#!/usr/bin/python

import gi

gi.require_version("Gtk", "3.0")
from gi.repository import Gtk

dirty = False

class Handler:
	def onDestroy(self, *args):
		Gtk.main_quit()
	def onQuit(self, *args):
		if dirty:
			""" show warning """
		self.onDestroy(self, args)

builder = Gtk.Builder()
builder.add_from_file("lensdatabase.ui")
builder.connect_signals(Handler())

window = builder.get_object("main_window")
window.show_all()

Gtk.main()