basic_data.py

from random import sample
from string import ascii_lowercase
from uuid import uuid4

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.checkbox import CheckBox
from kivy.uix.button import Button

kv = """      
<ColorizedBLayout@BoxLayout>:
    canvas.before:
        Color:
            rgba: 0.5, 0.5, 0.5, 1
        Rectangle:
            size: self.size
            pos: self.pos

<Row>:
    uuid: ''
    value: ''
    BoxLayout:
        ColorizedBLayout:
            orientation: 'vertical'
            Label:
                text: root.value
            Label:
                text: root.value
        Label:
            text: root.value
        CheckBox:
            active: False
            allow_no_selection: True
            on_active: root.select()

<Test>:
    canvas:
        Color:
            rgba: 0.3, 0.3, 0.3, 1
        Rectangle:
            size: self.size
            pos: self.pos
    rv: rv
    orientation: 'vertical'
    GridLayout:
        cols: 4
        rows: 2
        size_hint_y: None
        height: dp(108)
        padding: dp(8)
        spacing: dp(16)

        Button:
            text: 'Populate list'
            on_press: root.populate()
        Button:
            text: 'Sort list'
            on_press: root.sort()
        Button:
            text: 'Clear list'
            on_press: root.clear()
        BoxLayout:
            spacing: dp(8)
            Button:
                text: 'Insert new item'
                on_press: root.insert(new_item_input.text)
            TextInput:
                id: new_item_input
                size_hint_x: 0.6
                hint_text: 'value'
                padding: dp(10), dp(10), 0, 0
        BoxLayout:
            spacing: dp(8)
            Button:
                text: 'Update first item'
                on_press: root.update(update_item_input.text)
            TextInput:
                id: update_item_input
                size_hint_x: 0.6
                hint_text: 'new value'
                padding: dp(10), dp(10), 0, 0
        Button:
            text: 'Remove first item'
            on_press: root.remove()
        Button:
            text: 'Remove selected'
            on_press: root.remove_selected()

    RecycleView:
        id: rv
        scroll_type: ['bars', 'content']
        scroll_wheel_distance: dp(114)
        bar_width: dp(10)
        viewclass: 'Row'
        RecycleBoxLayout:
            default_size: None, dp(56)
            default_size_hint: 1, None
            size_hint_y: None
            height: self.minimum_height
            orientation: 'vertical'
            spacing: dp(2)
"""

Builder.load_string(kv)
selected_rvg = []

class Row(BoxLayout):
    def select(self):
        global selected_rvg
        if self.value:
            selected_rvg.append(self.uuid)
        else:
            selected_rvg.remove(self.uuid)

class Test(BoxLayout):
    def populate(self):
        global rvg
        self.rv.data = [{'uuid':str(uuid4()),'value': ''.join(sample(ascii_lowercase, 6))} for x in range(100)]
        rvg = self.rv

    def sort(self):
        self.rv.data = sorted(self.rv.data, key=lambda x: x['value'])

    def clear(self):
        self.rv.data = []

    def insert(self, value):
        self.rv.data.insert(0, {'value': value or 'default value'})

    def update(self, value):
        if self.rv.data:
            self.rv.data[0]['value'] = value or 'default new value'
            self.rv.refresh_from_data()

    def remove(self):
        if self.rv.data:
            self.rv.data.pop(0)

    def remove_selected(self):
        global rvg
        global selected_rvg
        rv = rvg
        for id in selected_rvg:
            for da in rv.data:
                if id is da['uuid']:
                    dad = rv.data.index(da)
                    rv.data.pop(dad)##???
        del selected_rvg[:]


class TestApp(App):
    def build(self):
        return Test()


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