gistfile1.py

from kivy.app import App 
from kivy.uix.label import Label
from kivy.animation import Animation


class DraggableLabel(Label):
    '''A label you can drag upside-down'''
    def on_touch_down(self, touch):
        if self.collide_point(*touch.pos):
            # assure ourselves we will get the updates of this motion
            touch.grab(self)
            return True

        return super(DraggableLabel, self).on_touch_down(touch)

    def on_touch_move(self, touch):
        if touch.grab_current is self:
            # really straightforward...
            self.x = touch.x
            return True

        return super(DraggableLabel, self).on_touch_move(touch)

    def on_touch_up(self, touch):
        if touch.grab_current is self:
            # check if the movement direction was up or down
            if touch.dx < 0:
                a = Animation(x=0) # down? put the bar all the way down
            else:
                # A wrong solution
                a = Animation(x=self.parent.x) # up? put it at the top
                # Right one
                a = Animation(x=self.parent.width - self.width) # up? put it at the top

            a.start(self) # actually start the animation
            return True

        return super(DraggableLabel, self).on_touch_up(touch)




class DragLabelApp(App):
    pass

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

gistfile2.py

FloatLayout:
    FloatLayout:
        Label:
            center: root.center
            text: 'test content'
            size_hint: None, None
            size: self.texture_size

    ScrollView:
        x: dg.x 
        y: root.y
        size_hint_x: None
        do_scroll_x: True
        do_scroll_y: False
        width: root.x - dg.x
        canvas:
            Color:
                rgba: 0, 0, 0, .8
            Rectangle:
                pos: self.pos
                size: self.size

    # the actual notification container, with placeholder content
        BoxLayout:
            size_hint_x: None
            width: 500
            orientation: 'vertical'
            Label:
                text: 'test'
            Label:
                text: 'test'
            Label:
                text: 'test'
            Label:
                text: 'test'
            Label:
                text: 'test'
            Label:
                text: 'test'
            Label:
                text: 'test'
            Label:
                text: 'test'
            Label:
                text: 'test'

    DraggableLabel:
        canvas.before:
            Color:
                rgba: 0,0,1,1
            Rectangle:
                pos: self.pos
                size: self.size

        size_hint_x: None
        x: root.x
        id: dg
        width: '50pt'
        text: 'Drag me'