from kivy.app import App
from kivy.uix.textinput import TextInput
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.scatter import Scatter
from kivy.uix.label import Label

def printok():
        print("ok")

class MyFirstApp(App):

    def build(self):
        layout = FloatLayout()
        scatter = Scatter()
        label = Label(text="Hello", font_size=150)
        box = BoxLayout(orientation='vertical')
        input = TextInput(
              font_size=200,
              size_hint_y=None,
              height=200)

        layout.add_widget(scatter)
        scatter.add_widget(label)

        box.add_widget(input)
        box.add_widget(layout)
        input.bind(text=printok)

        return box

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