slide in menu. old code. (Kivy)

slide_in_menu.py

# -*- coding: utf-8 -*-

import kivy
kivy.require('1.9.1')
from kivy.base import runTouchApp
from kivy.lang import Builder
from kivy.factory import Factory
from kivy.animation import Animation

Builder.load_string(r'''
<MenuItem@ButtonBehavior+Label>:
    font_size: self.height
    canvas.before:
        Color:
            rgba: [.2, .2, .2, 1] if self.state == 'down' else [0, 0, 0, 0]
        Rectangle:
            pos: self.pos
            size: self.size
        Color:
            rgba: [1, 1, 1, 1]
        Line:
            rectangle: [self.x, self.y, self.width, self.height]
    on_press: print("'{}' button was pressed.".format(self.text))

<Menu@BoxLayout>:
    layout: id_layout
    orientation: 'vertical'
    padding: [5]
    spacing: 20
    Label:
        size_hint_y: 1
        text: 'Menu'
        font_size: self.height
    ScrollView:
        size_hint_y: 5
        do_scroll_x: False
        GridLayout:
            id: id_layout
            size_hint: 1, None
            height: self.minimum_height
            cols: 1
            row_default_height: self.parent.height / 7
            row_force_default: True
            spacing: 10

<SlideinMenu>:
    canvas:
        Clear:
        Color:
            rgba: 0, 0, 0, 0.7
        Rectangle:
            pos: 0, 0
            size: self.size if self.parent is None else self.parent.size
''')


class SlideinModalView(Factory.ModalView):

    def open(self, *args, **kwargs):
        size_hint_x = self.size_hint_x
        self.pos_hint = {'x': -size_hint_x}
        animation = Animation(
            pos_hint={'x': (1 - size_hint_x) / 2},
            duration=0.3,
            transition='in_cubic'
        )
        super(SlideinModalView, self).open(*args, **kwargs)
        animation.start(self)

    def dismiss(self, *args, **kwargs):
        size_hint_x = self.size_hint_x
        animation = Animation(
            pos_hint={'x': -size_hint_x},
            duration=0.3,
            transition='in_out_bounce'
        )
        super(SlideinModalView, self).dismiss(*args, **kwargs)
        animation.start(self)


class SlideinMenu(SlideinModalView):

    def __init__(self, **kwargs):
        super(SlideinMenu, self).__init__(**kwargs)
        self.menu = menu = Factory.Menu()
        self.layout = menu.layout
        self.add_widget(menu)


def _test():
    import textwrap
    slideinmenu = SlideinMenu(size_hint=(0.8, 0.8,))
    layout = slideinmenu.layout
    for text in 'Python Ruby C++ Smalltalk Javascript C Swift'.split():
        layout.add_widget(Factory.MenuItem(text=text))
    root = Builder.load_string(textwrap.dedent('''
        FloatLayout:
            Button:
                id: id_button
                size_hint: None, None
                size: 300,100
                text: 'open menu'
    '''))
    root.ids.id_button.bind(on_press=slideinmenu.open)
    runTouchApp(root)


if __name__ == '__main__':
    _test()