from kivy.lang.builder import Builder

from kivy.app import App, runTouchApp

from kivy.uix.boxlayout import BoxLayout

from kivy.uix.screenmanager import ScreenManager, Screen

from kivy.uix.scrollview import ScrollView

from kivy.uix.stacklayout import StackLayout

Builder.load_string('''

<Row>

    orientation: 'vertical'

    size_hint_y: None

    height: '40dp'

    Button:

        text: 'row'

<Box>

    orientation: 'lr-tb'

    spacing: '10dp'

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

    Row:

<Main>

    ScrollView:

        Box:

''')

class Main(Screen):

    pass

class Box(StackLayout):

    pass

class Row(BoxLayout):

    def __init__(self, *args, **kwargs):

        super(Row, self).__init__(*args, **kwargs)

        print('row init')

class MyApp(App):

    def build(self):

        return Main()

runTouchApp(Main())

# if __name__ == '__main__':

#     MyApp().run()