main.py

import kivy
kivy.require("1.11.1")

from kivy.config import Config
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager
from mainwidgets import *
from loginscreen import *
from menuscreen import *
from costscreen import *
from profilescreen import *
from registerscreen import *
from debugscreen import *

from guest import *

# configure window size, color and icon
WINDOW_WIDTH_MIN = 1200
WINDOW_HEIGHT_MIN = 720
Window.size = WINDOW_WIDTH_MIN, WINDOW_HEIGHT_MIN
Window.minimum_width = WINDOW_WIDTH_MIN
Window.minimum_height = WINDOW_HEIGHT_MIN
Config.set("kivy", "exit_on_escape", 0)
Config.set("input", "mouse", "mouse,multitouch_on_demand")

Builder.load_file("mainwidgets.kv")
Builder.load_file("loginscreen.kv")
Builder.load_file("menuscreen.kv")
Builder.load_file("costscreen.kv")
Builder.load_file("profilescreen.kv")
Builder.load_file("registerscreen.kv")
Builder.load_file("debugscreen.kv")


class MainScreenManager(ScreenManager):

    last = []

    def on_current(self, instance, value):
        super().on_current(instance, value)
        MainScreenManager.last.append(value)
        if len(MainScreenManager.last) > 2:
            MainScreenManager.last.pop(0)

    def undo(self):
        self.current = self.last[0]


class KimberleyQuestApp(App):

    def build(self):
        self.title = "Kimberley Quest"
        self.icon = "res/icon.png"


KimberleyQuestApp().run()