How to add scrolling text widget in Kivy?
<p>I am new in Kivy. I would like to create an app that takes user text input, then display it. But when the user input is very long, I want the display area to be scrollable.</p>

<p>I have done some tutorials and can do both things separately, but I have troubles putting them altogether.</p>

<p>Here is the code to allow scrollable text:</p>

<pre><code>__version__ = '1.0.1'

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.widget import Widget
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.scrollview import ScrollView
import warnings
import string
from kivy.base import runTouchApp
from kivy.lang import Builder
from kivy.properties import StringProperty

Builder.load_string('''
&lt;ScrolllabelLabel&gt;:
    Label:
        text: root.text
        font_size: 50
        text_size: self.width, None
        size_hint_y: None
        height: self.texture_size[1]
''')

class ScrolllabelLabel(ScrollView):
    text = StringProperty('srgsdrgsdfh dsfg dvgf vgsdfv srfvsdfsdrfv sevrv sdrfv serv serv serv servsrd vsv srvsdrfvvv' * 10)

runTouchApp(ScrolllabelLabel())
</code></pre>

<p>And here is the code to display what you type:</p>

<pre><code>__version__ = '1.0.1'

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button
from kivy.uix.widget import Widget
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.scrollview import ScrollView
import warnings
import string
from kivy.base import runTouchApp
from kivy.lang import Builder
from kivy.properties import StringProperty

class SomeApp(App):
    def build(self):
        grid = GridLayout(cols=1, size_hint_x=None, width="600dp")

        self.lbl0 = Label(text='Tap and type a word/phrase below') # create a label instance
        grid.add_widget(self.lbl0) # physically add the label onto the layout

        self.txt1 = TextInput(text='', multiline=False) # create a text input instance
        grid.add_widget(self.txt1) # physically add the text input onto the layout

        self.lbl1 = Label(text='Display') # create a label instance
        grid.add_widget(self.lbl1) # physically add the label onto the layout

        btn1 = Button(text='Press') # create a button instance
        btn1.bind(on_press=self.mirror) # binding the button with the function below
        grid.add_widget(btn1) 

        return grid

    def mirror(self, userInput):
        self.lbl1.text = self.txt1.text

SomeApp().run()
</code></pre>

<p>But I can't combine them:</p>

<pre><code>__version__ = '1.0.1'

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.button import Button
from kivy.uix.widget import Widget
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.scrollview import ScrollView
import warnings
import string
from kivy.base import runTouchApp
from kivy.lang import Builder
from kivy.properties import StringProperty

Builder.load_string('''
&lt;ScrolllabelLabel&gt;:
    Label:
        text: root.text
        font_size: 50
        text_size: self.width, None
        size_hint_y: None
        height: self.texture_size[1]
''')

class ScrolllabelLabel(ScrollView):
    def __init__(self, **kwargs):
        self.txt0 = StringProperty()

class SomeApp(App):
    def build(self):
        grid = GridLayout(cols=1, size_hint_x=None, width="600dp")

        self.lbl0 = Label(text='Tap and type a word/phrase below') # create a label instance
        grid.add_widget(self.lbl0) # physically add the label onto the layout

        self.txt1 = TextInput(text='', multiline=False) # create a text input instance
        grid.add_widget(self.txt1) # physically add the text input onto the layout

        btn1 = Button(text='Press') # create a button instance
        btn1.bind(on_press=self.displayFunc) # binding the button with the function below
        grid.add_widget(btn1) 

        # Add scrolling text
        """self.lbl1 = Label(text='Display') # create a label instance
        grid.add_widget(self.lbl1) # physically add the label onto the layout"""
        scrollWidget = ScrolllabelLabel(text=self.lbl1.text)
        grid.add_widget(scrollWidget)

        return grid

    def displayFunc(self, userInput):
        self.lbl1.text = self.txt1

SomeApp().run()
</code></pre>

<p>I got this error:</p>

<pre><code> AttributeError: 'SomeApp' object has no attribute 'lbl1'
</code></pre>