kv 31 toggle button

#font.py

from kivy.app import App

from kivy.properties import StringProperty

from kivy.uix.widget import Widget

class Font(Widget):

    digit = StringProperty("1")

    num = 1

    enable = False

    def button_click(self):

        if self.enable:

            self.num += 1

            self.digit = str(self.num)

    def toggle(self, widget):

        print("toggle state: " + widget.state)

        if widget.state == "normal":

            widget.text = "OFF"

            self.enable = False

        else:

            widget.text = "ON"

            self.enable = True

class FontApp(App):

    pass

FontApp().run()

--------------------

#font.kv

Font:

    BoxLayout:

        size: root.width, root.height

        ToggleButton:

            text: "off"

            on_state: root.toggle(self)

            size_hint: None, 1

            width: "100dp"

            font_size: "70dp"

        Button:

            text: "Count"

            on_press: root.button_click()

            font_size: "70dp"

        Label:

            text: root.digit

            font_name: "font/LCD.ttf"

            font_size: "200dp"

reference:

https://www.youtube.com/watch?v=l8Imtec4ReQ&t=529s