现在，当我点击加密终端显示一个加密的消息，我只想显示在一个可滚动的文本框与能力，以复制加密的消息消息消息，我尝试了很多想法，但我不能做到这一点
这是代码，请检查一下。
加密md2.py

from kivymd.app import MDApp
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager
from kivy.factory import Factory
from kivy.animation import Animation
import string
from kivy.properties import ObjectProperty
from kivy.core.window import Window
from kivymd.uix.label import Label
from kivy.uix.scrollview import ScrollView

Window.size = (360, 600)
alphabet = string.ascii_lowercase

class Encrypt:

    def encrypt(self, Text, key):
        Text = Text.lower()
        key = key
        Key = int(key)

        encrypted_message = ""

        for c in Text:
            if c in alphabet:
                position = alphabet.find(c)
                new_position = (position + Key) % 26
                new_character = alphabet[new_position]
                encrypted_message += new_character

            else:
                encrypted_message += c
        message = str(encrypted_message)
        print(message.upper())

    def decrypt(self, Text, key):
        Text = Text.lower()
        key = key
        Key = int(key)

        encrypted_message = ""

        for c in Text:
            if c in alphabet:
                position = alphabet.find(c)
                new_position = (position - Key) % 26
                new_character = alphabet[new_position]
                encrypted_message += new_character

            else:
                encrypted_message += c
        message = str(encrypted_message)
        print(message.upper())

class CryptoMD(MDApp):
    Encrypt = ObjectProperty()

    def __init__(self,**kwargs):
        self.Encrypt = Encrypt()
        self.title = 'Crypto'
        self.sm = ScreenManager()
        super().__init__(**kwargs)

    def animate_card(self, widget):
        anim = Animation(pos_hint={"center_y": 0.6}, duration=1)
        anim.start(widget)

    def animate_background(self, widget):
        anim = Animation(size_hint_y=1) + Animation(size_hint_y=0.5, duration=0.5)
        anim.start(widget.ids.bx)

    def build(self):
        self.sm.add_widget(Factory.Main())
        return self.sm

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

这是cryptomd.kv

# :kivy 1.11.1

# :import rgba kivy.utils.rgba

<Main@Screen>:
    name: "cryptomd"

    on_enter:
        app.animate_card(card)
        app.animate_background(background)

    BackgroundLayer:
        id: background

    MDCard:
        id:card
        orientation: 'vertical'
        size_hint: [0.8, 0.7]
        pos_hint: {'center_x': 0.5, 'center_y': 0}
        padding: [20, 10, 10, 20]
        spacing: 7

        BoxLayout:
            padding: [10, 10, 10, 10]
            orientation: 'vertical'

            MDLabel:
                text: "[color=000000] Caesar Cipher [/color]"
                text_size: self.size
                font_size: 30
                bold: True
                markup: True
                halign: "center"
                valign: "top"

        MDTextField:
            id: Text
            text: "A"
            auto_indent: True
            allow_copy: True
            multiline: False
            helper_text: "Enter Text..."
            helper_text_mode: "persistent"
            required: True

        MDTextField:
            id: key
            text: "1"
            input_filter: "int"
            helper_text: "Enter Key..."
            helper_text_mode: "persistent"
            required: True

        MDRoundFlatButton:
            id: encrypt
            text: "Encrypt"
            size_hint_x: 0.6
            pos_hint: {'center_x': 0.5}
            on_press:
                app.Encrypt.encrypt(Text.text, key.text) if Text.text != "" else None

        MDRoundFlatButton:
            id: decrypt
            text: "Decrypt"
            size_hint_x: 0.6
            pos_hint: {'center_x': 0.5}
            on_press:
                app.Encrypt.decrypt(Text.text, key.text) if Text.text != "" else None

<BackgroundLayer@BoxLayout>:
    orientation: 'vertical'
    BoxLayout:
        id: bx
        orientation: 'vertical'
        size_hint_y: 0.1
        canvas.before:
            Color:
                rgba: rgba('#8A2BE2')
            RoundedRectangle:
                pos: self.pos
                size: self.size
                radius: [0, 0, 40, 40]

    BoxLayout:
        orientation: 'horizontal'
        padding: [10, 10, 10, 30]

提前谢谢。。