How to block touch functions in Kivy app temporarily?

Question

I want to block the all the touch functions temporarily when some content is loading like, I have added an MDSpinner when its fetching some details from database and at that time, I don't want my users to type in the text fields or click the buttons on the screen. So, how can we do that?

Answer 1

You can do something like this

from kivymd.app import MDApp

from kivy.lang.builder import Builder
from kivy.uix.modalview import ModalView
from kivy.properties import BooleanProperty
from kivy.clock import Clock

KV = """
<ModalViewSpinner>
    overlay_color: [0, 0, 0, 0.5]
    background_color: [0, 0, 0, 0]
    background: ''
    
    MDSpinner:
        size_hint: None, None
        size: dp(46), dp(46)
        pos_hint: {'center_x': .5, 'center_y': .5}
        active: root.active
        
Screen:
    MDRoundFlatButton:
        text: "Fetching details from database"
        pos_hint: {"center_x": .5, "center_y": .5}
        on_release: app.block_screen()
"""


class ModalViewSpinner(ModalView):
    active = BooleanProperty(False)

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.bind(on_open=lambda *args: self.change_spinner_state(True),
                  on_dismiss=lambda *args: self.change_spinner_state(False)
                  )

    def change_spinner_state(self, state: bool):
        self.active = state


class TestApp(MDApp):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.spinner_view = None

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

    def block_screen(self):
        if not self.spinner_view:
            self.spinner_view = ModalViewSpinner()

        self.spinner_view.open()

        Clock.schedule_once(self.spinner_view.dismiss, 2.0)


TestApp().run()