from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.properties import ObjectProperty, StringProperty
import win32api

class MainScreen(Screen):
    pass

class AnotherScreen1(Screen):
    def check_validation(self,instance,username,password):
        if (username == "") or (password == ""):
            print("Blank spaces are not allowed")
            win32api.MessageBox(0, 'Username and/or Password cannot be Blank', 'Warning')
        elif username == password:
            instance.current = "other2"
        else:
            print("username and password don't match")
            win32api.MessageBox(0, 'Invalid Username and/or Password', 'Warning')
            instance.current = "other1"

class AnotherScreen2(Screen):
    def screen_transition(self,instance,btn):
        if(btn == 'BACK'):
            instance.current = "other1"
        elif(btn == 'LOGOUT'):
            instance.current = 'main'

class ScreenManagement(ScreenManager):
    pass

class MyBox(BoxLayout):
    pass

buildbox = Builder.load_file("main_box.kv")

class simplekivy3(App):
    def build(self):
        return buildbox

if __name__ == '__main__':
    simplekivy3().run()