gistfile1.txt

from functools import partial

from kivy.config import Config
Config.set('modules', 'inspector', '')
from kivy.garden.recycleview import RecycleView, RecycleViewMixin, LayoutChangeException
from kivy.lang import Builder
from kivy.app import App
from kivy.factory import Factory
from kivy.animation import Animation


KV = """
<ContactItem>:
    canvas.before:
        Color:
            rgba: 1, 1, 1, 0.5
        Rectangle:
            pos: self.pos
            size: self.size
    color: 0, 0, 0, 0.5

BoxLayout:
    rv: rv
    orientation: "vertical"
    BoxLayout:
        size_hint_y: None
        height: 30
        Button:
            text: "add"
            on_release: app.add_item(len(rv.data))
        Button:
            text: "remove"
            on_release: app.remove_item(0)
    RecycleView:
        id: rv
        key_viewclass: 'viewclass'
        key_size: 'height'
"""


def update_anim(rv, index, anim, widget, progress):
    rv.data[index]['height'] = progress * 70
    rv.ask_refresh_from_data(extent='data_size')

def finish_anim(rv, index, anim, widget):
    update_anim(rv, index, anim, widget, 1)
    print 'anim finished', rv.data[index]
    print '\n\n'


class ContactItem(RecycleViewMixin, Factory.Label):

    def refresh_view_layout(self, rv, index, pos, size, viewport):
        item = rv.data[index]
        if not item['visible']:
            item['visible'] = True
            self.height = 0
            self.opacity = 0
            self.rv = rv
            self.data_index = index
            print 'animate', item
            anim = Animation(opacity=1, d=0.2)
            anim.bind(on_progress=partial(update_anim, rv, index), on_complete=partial(finish_anim, rv, index))
            anim.start(self)
            self.size = 0, 0
            raise LayoutChangeException()
        self.pos = pos
        self.size = size

    def on_anim(self, rv, index, prop, _, value, *args):
        rv.data[index][prop] = value
        #rv.ask_refresh_viewport()

    def on_anim_complete(self, h_callback, o_callback, *args):
        self.anim_in.unbind(on_complete=self.a_comp_callb)
        self.unbind(height=h_callback, opacity=o_callback)


class RecycleViewApp(App):

    def build(self):
        return Builder.load_string(KV)

    def add_item(self, index):
        data = self.root.rv.data
        data.insert(index, {#'opacity': 0,
                            'visible': False,
                            'height': 0,
                            'viewclass': 'ContactItem',
                            'text': 'x' + str(len(data))})

    def remove_item(self, index):
        data = self.root.rv.data
        data.pop(0)

RecycleViewApp().run()