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Reference a input box id on kivy screen

I think this problem is easy to solve, but i dont have experience enough to do this.
So, I want to reference the input text (MDTextField on kv file) for the variable "name" that is inside the press() function, so that I can write inside the popup.
I'm learning kivymd for a college project, so, discount the errors and unnecessary informations :/
Here is my kv file
Screen:
id: screen1
NavigationLayout:
id: navigation
ScreenManager:
id: screen_manager
Screen:
id: fact
name: 'fact'
BoxLayout:
orientation: 'vertical'
MDToolbar:
title: "Menu"
elevation: 10
left_action_items: [['menu', lambda x: nav_drawer.set_state()]]
Widget:
MDLabel:
text: "Fact Checker"
font_size: 56
font_name: "MontserratBold"
pos_hint: {'center_x': 0.75, 'center_y': 0.7}
theme_text_color: "Custom"
text_color: (53/255, 183/255, 1, 1)
MDTextField:
id: input_box
hint_text: "Type here"
font_size: 18
pos_hint: {'center_x': 0.5, 'center_y': 0.45}
size_hint_x: None
width: 500
multiline: True
helper_text: "Type the title of the news"
helper_text_mode: "on_focus"
theme_text_color: "Custom"
text_color: (53/255, 183/255, 1, 1)
line_color_normal: 1, 1, 1, 1
MDRectangleFlatButton:
text: "Check"
pos_hint: {'center_x': 0.5, 'center_y': 0.25}
theme_text_color: "Custom"
text_color: (1, 1, 1, 1)
on_press: app.press()
MDLabel:
markup: True
text: "<Developed by: [color=#cfd0d1]Caio Barreto and Gabriel Queiroz[/color]>"
font_name: "Montserrat"
theme_text_color: "Custom"
text_color: (53/255, 183/255, 1, 0.5)
pos_hint: {'center_x': 0.74, 'center_y': 0.1}
Screen:
name: 'discord'
BoxLayout:
orientation: 'vertical'
MDToolbar:
title: "Menu"
elevation: 10
left_action_items: [['menu', lambda x: nav_drawer.set_state()]]
Widget:
MDLabel:
text: 'teste1'
Screen:
name: 'add'
BoxLayout:
orientation: 'vertical'
MDToolbar:
title: "Menu"
elevation: 10
left_action_items: [['menu', lambda x: nav_drawer.set_state()]]
Widget:
MDLabel:
text: 'teste2'
MDNavigationDrawer:
id: nav_drawer
ContentNavigationDrawer:
ScrollView:
DrawerList:
id: md_list
MDList:
OneLineIconListItem:
text: "Menu"
on_press: screen_manager.current = "fact"
IconLeftWidget:
icon: "home"
OneLineIconListItem:
text: "Discord"
on_press: screen_manager.current = "discord"
IconLeftWidget:
icon: "discord"
OneLineIconListItem:
text: "Add more news"
on_press: screen_manager.current = "add"
IconLeftWidget:
icon: "circle-edit-outline"
Here is my python code:
from kivymd.app import MDApp
from kivy.lang.builder import Builder
from kivymd.uix.dialog import MDDialog
from kivymd.uix.textfield import MDTextField
from kivymd.uix.button import MDRectangleFlatButton, MDFlatButton
from kivymd.uix.navigationdrawer import NavigationLayout
from kivymd.uix.list import MDList
from kivymd.uix.boxlayout import BoxLayout
from kivymd.theming import ThemableBehavior
from kivy.core.text import LabelBase
from kivy.uix.widget import Widget
from helper import username_input
from kivymd.uix.screen import Screen
LabelBase.register(name="MontserratBold", fn_regular="font/Montserrat-Bold.ttf")
LabelBase.register(name="Montserrat", fn_regular="font/Montserrat-Medium.ttf")
class FactCheckerApp(MDApp):
class ContentNavigationDrawer(BoxLayout):
pass
class DrawerList(ThemableBehavior, MDList):
pass
def build(self):
self.file = Builder.load_file('projeto.kv')
self.theme_cls.theme_style = "Dark"
self.theme_cls.primary_palette = "LightBlue"
print(self.file.Screen.ids.)
return self.file
def press(self):
name = self.screen1.navigation.screen_manager.fact.input_box.text
close_button = MDFlatButton(text='Close', on_release=self.close_dialog)
self.dialog = MDDialog(title='Answer', text=name, size_hint=(0.5, 1), buttons=[close_button])
self.dialog.open()
def close_dialog(self, obj):
self.dialog.dismiss()
if __name__ == '__main__':
FactCheckerApp().run()

To access the MDTextField, you can just reference it through its id, which is defined in the widget that is the root of the kv rule where the id is defined (in this case, in the Screen). Try changing:
name = self.screen1.navigation.screen_manager.fact.input_box.text
to:
name = self.root.ids.input_box.text
in the press() method.

How do I use a variable for the text in an MDLabel?

I'm trying to put the username that I input from an MDTextField into a MDLabel text. In my case, the MDLabel is in a MDNavigationDrawer that comes after the user presses the submit button and goes to the next screen.
All I could think of so far is declaring usn as a string property in the submit screen:
class SubmitScreen(Screen):
usn = StringProperty()
then created a method to set usn to the input of the MDTextfield in my app:
def getname(self):
usn = (self.root.get_screen("menu").ids.userdata.text)
then I set the text in my MDLabel to root.usn
MDLabel:
text: root.usn
font_style: 'Subtitle1'
size_hint_y:None
height: self.texture_size[1]
When I go to the next screen, MDLabel is blank. It doesn't give me an error but it doesn't show what I typed in the MDTextField, it's simply blank.
This is my code in full:
screen_helper = """
ScreenManager:
MenuScreen:
SubmitScreen:
<MenuScreen>:
name: 'menu'
MDTextField:
id : userdata
hint_text: "Enter Username"
helper_text: "or click on forgot username"
#helper_text_mode: "persistent"
helper_text_mode: "on_focus"
icon_right: "account"
icon_right_color: app.theme_cls.primary_color
pos_hint : {'center_x': 0.5, 'center_y': 0.4}
size_hint_x:None
width:250
mode : "rectangle"
MDTextField:
id: userpass
hint_text: "Enter Password"
helper_text: "or click on forgot Password"
#helper_text_mode: "persistent"
password : True
helper_text_mode: "on_focus"
icon_right: "eye-off"
icon_right_color: app.theme_cls.primary_color
pos_hint : {'center_x': 0.5, 'center_y': 0.3}
size_hint_x:None
width:250
mode : "rectangle"
MDLabel:
text: "Company X"
pos_hint: {'center_x':0.5, 'center_y':0.7}
font_style: 'H3'
halign: 'center'
MDRectangleFlatButton:
text: 'Submit'
pos_hint: {'center_x':0.5, 'center_y':0.2}
font_size : 20
on_press:
app.getname()
app.root.current = 'submit'
<SubmitScreen>:
name: 'submit'
NavigationLayout:
ScreenManager:
Screen:
BoxLayout:
orientation: 'vertical'
MDToolbar:
title: "Company X"
left_action_items: [["menu", lambda x : nav_drawer.toggle_nav_drawer()]]
elevation: 11
Widget:
MDFillRoundFlatIconButton:
spacing: '8dp'
padding: '20dp'
text: 'Menu'
pos_hint: {'center_x':0.5, 'center_y':0.9}
icon: 'account-child'
on_press: root.manager.current = 'menu'
MDFillRoundFlatIconButton:
text: 'View Account'
pos_hint: {'center_x':0.5, 'center_y':1}
font_size : 20
icon: 'account-cash'
on_press:
MDBottomAppBar:
md_bg_color: 0, 1, 0, 1
MDToolbar:
title: "by Tech Company"
left_action_items: [["coffee", lambda x : app.navigation_draw0()]]
right_action_items: [["clock", lambda x : app.navigation_draw1()]]
mode: 'free-end'
elevation: 13
type: 'bottom'
icon: 'account-check'
MDNavigationDrawer:
id: nav_drawer
BoxLayout:
orientation: 'vertical'
spacing: '8dp'
padding: '12dp'
Image:
source: 'img.jpg'
MDLabel:
text: root.usn
font_style: 'Subtitle1'
size_hint_y:None
height: self.texture_size[1]
MDLabel:
text: 'email#gmail.com'
font_style: 'Caption'
size_hint_y:None
height: self.texture_size[1]
ScrollView:
MDList:
#OneLineListItem:
OneLineIconListItem:
text: 'Profile'
IconLeftWidget:
icon: 'face-profile'
OneLineIconListItem:
text: 'Upload'
IconLeftWidget:
icon: 'upload'
OneLineIconListItem:
text: 'Logout'
conLeftWidget:
icon: 'logout'
MDRectangleFlatButton:
text: 'Menu'
pos_hint: {'center_x':0.5, 'center_y':0.4}
on_press: root.manager.current = 'menu'
MDRectangleFlatButton:
text: 'View Account'
pos_hint: {'center_x':0.5, 'center_y':0.3}
on_press:
"""
class MenuScreen(Screen):
pass
class SubmitScreen(Screen):
usn = StringProperty()
sm = ScreenManager()
sm.add_widget(MenuScreen(name='menu'))
sm.add_widget(SubmitScreen(name='submit'))
sm.add_widget(UploadScreen(name='upload'))
sm.add_widget(AccountScreen(name='account'))
class DemoApp(MDApp):
def build(self):
screen = Builder.load_string(screen_helper)
self.theme_cls.primary_palette = "Purple"
self.theme_cls.accent_palette = 'Blue'
self.theme_cls.primary_hue = "200"
self.theme_cls.theme_style = "Dark"
return screen
def getname(self):
usn = (self.root.get_screen("menu").ids.userdata.text)
DemoApp().run()

Set an ID to the MDLabel and then in the getname function change the MDLabel text to the input of the MDTextField.
In kv:
MDLabel:
text: "Text before"
id: label
In python:
def getname(self):
usn = (self.root.get_screen("menu").ids.userdata.text)
self.root.ids.label.text = usn

How do i add a signature/paint method to a screen in my app in either kv lang or normal kivy?

how do i add buttons to my paintScreen class without the on_touch_down/move interfering and making it so that i draw within a BoxLayout canvas and separate the buttons in a different box so that it wont draw over the buttons? This is the current problem i am having. Also if that problem is fixed then would i be able to save that drawing as an img if i use export_to_png
from kivy.app import App
from kivy.graphics.context_instructions import Color
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.properties import ObjectProperty
from kivy.uix.textinput import TextInput
from kivy.uix.widget import Widget
from kivy.uix.button import Button
from kivy.uix.dropdown import DropDown
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.spinner import Spinner
from kivy.uix.checkbox import CheckBox
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.lang.builder import Builder
from kivy.uix.recycleview import RecycleView
from kivy.uix.scrollview import ScrollView
from kivy.graphics import Line, Rectangle, Ellipse, Triangle
Builder.load_string("""
<firstScreen>
BoxLayout:
orientation: "vertical"
ScrollView:
size: root.size
GridLayout:
orientation: "vertical"
size_hint_y: None
height: self.minimum_height #<<<<<<<<<<<<<<<<<<<<
row_default_height: 90
cols: 2
Label:
text: "Name: "
TextInput:
multiline: False
Label:
text: "Address: "
TextInput:
multiline: False
Label:
text: "Contact: "
TextInput:
multiline: False
Label:
text: "Telephone: "
TextInput:
multiline: False
Label:
text: "Order Number: "
TextInput:
multiline: False
Label:
text: "Transporter's Name: "
TextInput:
multiline: False
Label:
text: "Vehicle Reg. No.: "
TextInput:
multiline: False
Label:
text: "Driver's Name: "
TextInput:
multiline: False
Label:
text:"Hazchem Requirements: "
Spinner:
id: spinner_1
text: "< Select >"
values: root.pick_opt
Spinner:
id: spinner_2
text: "Waste Details"
values: root.pick_classification
GridLayout:
size_hint: 1, None
rows:2
Label:
text: "Non-Hazardous"
Label:
text: "Hazardous"
CheckBox:
on_active: root.chk_tick
CheckBox:
on_active: root.chk_tick
Spinner:
id: spinner_3
text: "Service Details"
values: root.sog
TextInput:
multiline: False
hint_text: "Enter Volume/Weight"
Spinner:
id: spinner_4
text: "Service Details"
values: root.sog
TextInput:
multiline: False
hint_text: "Enter Volume/Weight"
Spinner:
id: spinner_5
text: "Service Details"
values: root.sog
TextInput:
multiline: False
hint_text: "Enter Volume/Weight"
Spinner:
id: spinner_6
text: "Service Details"
values: root.sog
TextInput:
multiline: False
hint_text: "Enter Volume/Weight"
Button:
text: "Next Screen"
size_hint: 1,.1
on_press: root.manager.current = "screen_2"
<secondScreen>
BoxLayout:
orientation: "horizontal"
ScrollView:
size: root.size
GridLayout:
orientation: "vertical"
size_hint_y: None
height: self.minimum_height #<<<<<<<<<<<<<<<<<<<<
row_default_height: 120
cols: 1
BoxLayout:
orientation: 'vertical'
Spinner:
id: spinner_7
text: "details"
width: self.parent.width * 2
values: root.pick_dets
Spinner:
id: spinner_8
text: "details"
values: root.pick_dets
Spinner:
id: spinner_9
text: "details"
values: root.pick_dets
GridLayout:
cols: 2
rows: 3
Label:
text: "Start Time"
Label:
text: "End Time"
TextInput:
multiline: False
TextInput:
multiline: False
GridLayout:
cols: 2
Label:
text: 'Special Instructions/Remarks'
TextInput:
hint_text: 'Enter Remarks'
Button:
id: signature
text: 'Signature'
on_press: root.manager.current = "screen_signature"
BoxLayout:
orientation: 'vertical'
Button:
text: "Previous Screen"
size_hint: 1,.1
on_press: root.manager.current = "screen_1"
Button:
text: "Next Screen"
size_hint: 1,.1
on_press: root.manager.current = "screen_2"
<paintScreen>
""")
class paintScreen(Screen):
# On mouse press how Paint_brush behave
def on_touch_down(self, touch):
color = (1, 1, 1)
with self.canvas:
Color(*color, mode='hsv')
d = 30.
Line(pos=(touch.x - d / 2, touch.y - d / 2), size=(d, d))
touch.ud['line'] = Line(points=(touch.x, touch.y))
# On mouse movement how Paint_brush behave
def on_touch_move(self, touch):
touch.ud['line'].points += [touch.x, touch.y]
pass
class firstScreen(Screen):
def __init__(self, **kwargs):
self.pick_opt = ["yes", "no"]
self.pick_classification = ["Classification (SANAS 10228)", "HR (1,2,3,4 - Minimum Requirements)",
"Emergency Response Guide Reference"]
self.sog = ['Oil', "Effluent", "Sludge", "Other"]
super(firstScreen, self).__init__(**kwargs)
def chk_tick(self, instance, value):
if value:
print("ticked")
else:
print('unticked')
pass
class secondScreen(Screen):
def __init__(self, **kwargs):
self.pick_dets = ["HP Cleaning", "Chemicals", "Soil Treatment",
"Minor Civils & Plumbing", "Effluent Treatment", "Other"]
super(secondScreen, self).__init__(**kwargs)
pass
class MyScreenManager(ScreenManager, RecycleView):
pass
screen_manager: ScreenManager = ScreenManager()
screen_manager.add_widget(firstScreen(name="screen_1"))
screen_manager.add_widget(secondScreen(name="screen_2"))
screen_manager.add_widget(paintScreen(name="screen_signature"))
class Myapp(App):
def build(self):
return screen_manager
def clear_canvas(self, obj):
self.painter.canvas.clear()
if __name__ == "__main__":
Myapp().run()

KivyMD App ScrollView exceeding the boundaries

I have a kivy app I built, that receives a message from a server, saves it into a text file, and displays the text file onto the screen. However, the text always exceeds the ScrollView widget and goes onto some other widgets like the picture below.
Is there any ways to solve this? Any help will be appreciated. Thank You.
This is my code:
#Todo: fix line 334 AttributeError
#Remove the upload button also
#Error Fixed
#Todo: fix message received exceeds border error
from kivy.app import App
from kivy.lang import Builder
from kivy.properties import ObjectProperty, StringProperty
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.image import Image
from kivymd.dialog import MDDialog
from kivymd.theming import ThemeManager
from kivymd.navigationdrawer import NavigationLayout
from kivymd.list import OneLineAvatarListItem, ILeftBody
from kivymd.toast import toast
from kivymd.dialog import MDDialog
from kivy.uix.popup import Popup
from threading import Thread
import socket
sock = socket.socket()
sock.connect(('127.0.0.1', 6818))
sock.sendall(b"add_contact hello llo")
sock = socket.socket()
sock.connect(('127.0.0.1', 6818))
sock.sendall(b'new llo')
class MyLayout(BoxLayout):
scr_mngr = ObjectProperty(None)
def check_data_login(self):
username = self.scr_mngr.screen1.username.text
password = self.scr_mngr.screen1.password.text
print(username)
print(password)
if username == "KivyMD" and password == "kivy":
self.ids["wrongpass"].text = ""
self.change_screen("screen2")
else:
self.ids["wrongpass"].text = "Wrong username or password, please try again"
def change_screen(self, screen, *args):
self.scr_mngr.transition.direction = 'left'
self.scr_mngr.current = screen
def back_to_chat(self):
self.scr_mngr.transition.direction = 'right'
self.scr_mngr.current = 'screen2'
class nav_layout(NavigationLayout):
def print_text(self):
print('hello')
def check_data_login(self):
username = self.ids.screen1.username.text
password = self.ids.screen1.password.text
print(username)
print(password)
if username == "KivyMD" and password == "kivy":
Thread(target=self.recover_data).start()
self.change_screen("screen2")
self.ids.wrongpass.text = ""
else:
self.ids.wrongpass.text = \
"Wrong username or password, please try again"
def recover_data(self):
print('started')
while True:
data = sock.recv(1024)
data = data.decode()
if data:
print(data)
data = data.split()
data = data[-1] + ": " + ' '.join(data[:-1])
r = data + '\n'
open('chat1.txt', 'a+').write(r)#Fix The the Attribute Error that occurs when a message is sent!!!!!
e = open('chat1.txt', 'r').readlines()
self.ids.Chat_String.text = '\n\r'.join(e)
print(data)
def change_screen(self, screen, *args):
self.ids.scr_mngr.transition.direction = 'left'
self.ids.scr_mngr.current = screen
def back_to_chat(self):
self.ids.scr_mngr.transition.direction = 'right'
self.ids.scr_mngr.current = 'screen2'
def logout(self):
# logout function, returns to screen 1
self.ids.scr_mngr.current = 'screen1'
class UploadPopup(Popup):
def load(self, path, selection):
print(path, selection)
KV = """
#:import Toolbar kivymd.toolbar.Toolbar
#:import MDNavigationDrawer kivymd.navigationdrawer.MDNavigationDrawer
#:import NavigationLayout kivymd.navigationdrawer.NavigationLayout
#:import NavigationDrawerDivider kivymd.navigationdrawer.NavigationDrawerDivider
#:import NavigationDrawerToolbar kivymd.navigationdrawer.NavigationDrawerToolbar
#:import MDTextField kivymd.textfields.MDTextField
#:import MDSeparator kivymd.card.MDSeparator
#:import MDThemePicker kivymd.theme_picker.MDThemePicker
#:import CardTransition kivy.uix.screenmanager.CardTransition
#:import Factory kivy.factory.Factory
<MDCustomIconItem>:
text: root.text
AvatarSampleWidget:
source: root.icon
<UploadPopup>:
id: popup
title: "Upload"
BoxLayout:
FileChooserIconView:
id: FileChoose
pos_hint_x: 0.5
pos_hint_y: 0.5
on_selection: root.load(FileChoose.path, FileChoose.selection)
MDRaisedButton:
text: "Upload"
text_color: (0,0,0,1)
on_release: root.load(FileChoose.path, FileChoose.selection)
on_release: popup.dismiss()
MDRaisedButton:
text: "Close"
text_color: (0,0,0,1)
on_release: popup.dismiss()
nav_layout:
id: nav_layout
MDNavigationDrawer:
id: nav_drawer
drawer_logo: 'logo.png'
NavigationDrawerToolbar:
title: 'hello'
NavigationDrawerIconButton:
icon: 'settings'
text: 'Account Settings'
on_release: root.change_screen('screen3')
NavigationDrawerIconButton:
icon: 'face'
text: 'Friends'
on_release: root.print_text()
NavigationDrawerIconButton:
icon: 'logout'
text: 'Logout'
on_release: root.logout()
NavigationDrawerDivider:
height: dp(1)
MyLayout:
scr_mngr: scr_mngr
orientation: 'vertical'
ScreenManager:
transition: CardTransition()
id: scr_mngr
screen1: screen1
Screen:
id: screen1
name: 'screen1'
username: username
password: password
BoxLayout:
size_hint: None, None
size: dp(520), dp(340)
pos_hint: {'center_x': 0.5, 'center_y': 0.5}
BoxLayout:
orientation:'vertical'
padding: dp(20)
spacing:20
MDLabel:
text: 'Chat App'
theme_text_color: 'Secondary'
font_style:"Title"
size_hint_y: None
height: dp(36)
MDSeparator:
height: dp(1)
MDTextField:
id: username
hint_text: "Username "
size_hint_y: 0.9
helper_text_mode: "on_focus"
MDTextField:
id: password
hint_text: "Password "
helper_text_mode: "on_focus"
size_hint_y: 0.9
password: True
MDFlatButton:
text: "Login"
pos_hint: {'center_x': 0.5}
on_release: root.check_data_login()
MDLabel:
id: wrongpass
color: 1,0,1,1
text: ""
Screen:
name: 'screen2'
id: screen2
Toolbar:
id: toolbar
title: "Welcome ! "
pos_hint: {'center_x': 0.5, 'center_y': 0.96}
md_bg_color: app.theme_cls.primary_color
background_palette: 'DeepPurple'
background_hue: 'A400'
left_action_items: [['menu', lambda x: app.root.toggle_nav_drawer() ]]
right_action_items: [['animation', lambda x: MDThemePicker().open()], ['camera', lambda x: print('hello')]]
MDLabel:
id: data
font_style: 'Title'
theme_text_color: 'Primary'
text: "Data :"
height: self.texture_size[1] + dp(3)
halign: 'center'
pos_hint: {'center_x': 0.5, 'center_y': 0.5}
Screen:
name: 'screen3'
id: screen3
Toolbar:
id: tools
title: "Your Profile"
pos_hint: {'center_x': 0.5, 'center_y': 0.96}
md_bg_color: app.theme_cls.primary_color
background_palette: 'DeepPurple'
background_hue: 'A400'
left_action_items: [['arrow-left', lambda x: root.back_to_chat()]]
MDLabel:
id: Profile_String
font_size: 90
text: "XXX"
halign: 'center'
pos_hint: {'center_x': 0.5, 'center_y': 0.85}
Screen:
name: 'screen4'
id: screen4
Toolbar:
id: tools
title: "XXX"
pos_hint: {'center_x': 0.5, 'center_y': 0.96}
md_bg_color: app.theme_cls.primary_color
background_palette: 'DeepPurple'
background_hue: 'A400'
left_action_items: [['menu', lambda x: app.root.toggle_nav_drawer() ]]
right_action_items: [['animation', lambda x: MDThemePicker().open()], ['camera', lambda x: print('hello')]]
ScrollView:
pos_hint: {'center_x': .55, 'y': .35}
MDLabel:
size_hint: 1, None
id: Chat_String
font_size: 40
text: "XXX"
MDTextField:
id: Input_String
hint_text: 'Enter Your Message...'
helper_text_mode: 'on_focus'
pos_hint: {'center_x': 0.35, 'center_y': 0.2}
size_hint_x: 0.6
multiline: True
MDRaisedButton:
id: Send_Button
text: 'Send'
pos_hint: {'center_x': 0.75, 'center_y': 0.2}
MDRaisedButton:
id: Choose_Image
text: 'Attach File'
pos_hint: {'center_x': 0.9, 'center_y': 0.2}
on_release: Factory.UploadPopup().open()
"""
class MDCustomIconItem(OneLineAvatarListItem):
icon = StringProperty('')
text = StringProperty()
def _set_active(self, active, list):
pass
class AvatarSampleWidget(ILeftBody, Image):
pass
class MyApp(App):
theme_cls = ThemeManager()
theme_cls.primary_palette = 'Blue'
title = "Navigation Drawer"
main_widget = None
def __getattr__(self, attr):
return super().__getattr__(attr)
def build(self):
self.main_widget = Builder.load_string(KV)
return self.main_widget
def callback(self, instance, value):
self.main_widget.ids.scr_mngr.current = 'screen4'
def on_start(self):
for i in range(15):
self.main_widget.ids.nav_drawer.add_widget(
MDCustomIconItem(
text="Item menu %d" % i,
icon='logo.png',
on_release=lambda x, y=i: self.callback(x, y)))
MyApp().run()

You need to set the size of the ScrollView. Add size_hint: (0.85, 0.55)
Snippets
ScrollView:
size_hint: (0.85, 0.55)
pos_hint: {'center_x': .55, 'y': .35}
MDLabel:
id: Chat_String
font_size: 40
Output

How should I set a global variable in kivy Python?

My application is simple, the ScreenTwo is showing a form 'Parametreur' with various options to be entered.
What I'm trying to do is to set a 'save' button at the end of this form that will register into a list called 'resultat' all the options furfilled so far leaving '0' in the empty inputs.
The global variable 'resultat' would look like this ['blabla','15/06/2018','31/12/1999','6'].
File.py
from kivy.app import App
from kivy.core.window import Window
from kivy.uix.screenmanager import ScreenManager, Screen, WipeTransition
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.properties import ObjectProperty
from kivy.lang import Builder
Builder.load_file("HadrianRunningApp.kv")
class ScreenMenu(Screen):
pass
class ScreenOne(Screen):
pass
class ScreenTwo(Screen):
pass
class Parametreur(FloatLayout):
def build(self):
pass
def submit_input(self):
# Get the student name from the TextInputs
label_name = self.label_text_input.text
resultat.insert(0,label_name)
def submit_input2(self):
date_debut_name = self.date_debut_input.text
resultat.insert(1,date_debut_name)
def submit_input3(self):
date_fin_name = self.date_fin_input.text
resultat.insert(2,date_fin_name)
def submit_input4(self):
var_duree_estimation = self.duree_estimation_input.text
resultat.insert(3,var_duree_estimation)
def save_input(self):
print(resultat)
class Manager(ScreenManager):
screen_menu = ObjectProperty(None)
screen_one = ObjectProperty(None)
screen_two = ObjectProperty(None)
class ScreensApp(App):
def build(self):
m = Manager(transition=WipeTransition())
return m
if __name__=='__main__':
ScreensApp().run()
The Kivy file .kv:
#:kivy 1.9.0
<ScreenMenu>:
BoxLayout:
orientation:'vertical'
size: root.size
padding: "20dp"
Button:
text: "go to Screen 1"
on_press: root.manager.current = 'screen1'
Button:
text: "go to Screen 2"
on_press: root.manager.current = 'Parametreur'
<ScreenOne>:
BoxLayout:
spacing: 20
padding: 20
Button:
text: "go to Screen 2"
on_press: root.manager.current = 'Parametreur'
Button:
text: "go to Menu"
on_press: root.manager.current = 'screen0'
<ScreenTwo>:
Parametreur
<Parametreur>:
label_text_input: label_text
date_debut_input: date_debut
date_fin_input: date_fin
duree_estimation_input: duree_estimation
resultat: resultat
RelativeLayout:
orientation: 'vertical'
GridLayout:
size_hint: (1., 0.11)
pos_hint: {'right': 1, 'center_y': 0.91}
padding: 6
spacing: "4dp"
cols:2
rows:1
Button:
text: "go to Screen 1"
on_press: root.manager.current = 'screen1'
Button:
text: "go to Menu"
on_press: root.manager.current = 'screen0'
GridLayout:
size_hint: (1., 0.8)
pos_hint: {'right': 1, 'center_y': 0.45}
padding: "7dp"
spacing: 5
cols:2
rows:7
Button:
text: "Liste Actif"
Label:
text: " "
BoxLayout:
Label:
text: "Date du début"
BoxLayout:
orientation: "vertical"
Button:
text: "Submit"
on_press: root.submit_input2()
TextInput:
id: date_debut
text: 'dd/mm/YYYY'
BoxLayout:
Label:
text: "Date de fin"
BoxLayout:
orientation: "vertical"
Button:
text: "Submit"
on_press: root.submit_input3()
TextInput:
id: date_fin
text: 'dd/mm/YYYY'
Label:
text: "Pourcentage de séparation \n de la base (validation/test)"
Button:
text: "Open to Close"
Button:
text: "Close to Close"
Button:
text: "les 3 (6 en tout) frontières des VSs"
BoxLayout:
Label:
text: "Durée pour la réestimation \n des modèles (en jours)"
BoxLayout:
orientation: "vertical"
Button:
text: "Submit"
on_press: root.submit_input4()
TextInput:
id: duree_estimation
text: 'dd/mm/YYYY'
Label:
text: "variable selection NMF/Entropy"
Label:
text: "Kernel/damiers/buntcher/\n neurone/XGBoost/Gradient boosting"
# We create the widgets
BoxLayout:
spacing: "0dp"
Label:
id: label_text
text: "0"
font_size: "30dp"
BoxLayout:
orientation: "vertical"
spacing: "3dp"
Button:
text: "Add"
on_release: label_text.text = str(int(label_text.text) + 1)
Button:
text: "Subtract"
on_release: label_text.text = str(int(label_text.text) - 1)
Button:
text: "Submit"
size_hint_x: None
on_press: root.submit_input()
BoxLayout:
padding: "2dp"
spacing: "2dp"
size_hint: (1., 0.50)
pos_hint: {'right': 1, 'center_y': 0.09}
Button:
id: resultat
text:"Save"
size_hint_x: None
on_press: root.save_input()
<Manager>:
id: screen_manager
screen_menu: screen_menu
screen_one: screen_one
screen_two: screen_two
ScreenMenu:
id: screen_menu
name: 'screen0'
manager: screen_manager
ScreenOne:
id: screen_one
name: 'screen1'
manager: screen_manager
ScreenTwo:
id: screen_two
name: 'Parametreur'
manager: screen_manager
Where and How should I set my global variable 'resultat' (which is a list)?
I've solved my problem but I still don't understand how does it work. Setting a variable is Kivy doesn't need to set it in the Python code. But how do Kivy and Python know about its type? Right now, it works as a list without me defining it such as (I intended it to be a list anyway).
How could I set a variable as tuple for example?