hide.py

from kivy.base import runTouchApp
from kivy.lang import Builder

KV = '''
#:import Animation kivy.animation.Animation
FloatLayout:
    BoxLayout:
        id: box
        x:0
        orientation: 'vertical'
        size_hint: None, None
        canvas:
            Color: 
                rgb: (1,0,0)
            Rectangle:
                pos:0,0
                size:self.size
        Button:
            text: 'push me'
            on_press:
                self.parent.x -= self.parent.width

'''

runTouchApp(Builder.load_string(KV))