Shahriar

.gitignore

*.pyc
.*.sw*

README

Small screenmanager test with multiple KVfiles and Python→KV interaction

main.py

from kivy.app import App

from testsm import TestSM

class Tst(App):
    def build(self):
        return TestSM()

Tst().run()

main_screen.kv

MainScreen:
    name: 'main'

    layout: layout

    ScrollView:
        GridLayout:
            id: layout

            size_hint_y: None
            height: self.minimum_height

            cols: 1
            spacing: 10

    Label:
        text: root.string

        font_size: '50dp'

main_screen.py

from kivy.uix.screenmanager import Screen
from kivy.properties import StringProperty, ObjectProperty
from kivy.uix.button import Button

class MainScreen(Screen):
    string = StringProperty('')
    layout = ObjectProperty(None)

    def on_layout(self, *args):
        layout = self.layout
        
        def append_text(*args):
            self.string += args[0].text

        for i in range(30):
            btn = Button(text=str(i + 1), size_hint_y=None, height=40, on_release=append_text)
            layout.add_widget(btn)

menu_screen.kv

MenuScreen:
    name: 'menu'

    Button:
        text: 'Start!'

        size_hint: .25, .1
        pos_hint: {'center': (.75, .5)}

        on_release:
            root.manager.current = 'main'

menu_screen.py

from kivy.uix.screenmanager import Screen

class MenuScreen(Screen):
    pass

testsm.py

from kivy.uix.screenmanager import ScreenManager
from kivy.lang import Builder

from menu_screen import MenuScreen
from main_screen import MainScreen

class TestSM(ScreenManager):
    def __init__(self, **kwargs):
        super(TestSM, self).__init__(**kwargs)

        self.add_widget(Builder.load_file('menu_screen.kv'))
        self.add_widget(Builder.load_file('main_screen.kv'))