Activate a ToggleButton based on the "down" state of four other ToggleButton 's

Question

Been stuck on this for a couple of days, decided to ask the kivy community!

Currently trying to figure out how to

-activate a ToggleButton based on the toggle state of four other ToggleButton s

Here is a picture of the interface:

Activating "down" state on Toggle1, Toggle2, Toggle3, and Toggle4 should activate MainToggle1

Here is what I have so far:

main.py
from kivy.app import App
from kivy.properties import StringProperty, BooleanProperty
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.gridlayout import GridLayout
from kivy.uix.widget import Widget

class ExternalTrigger(BoxLayout):
    buttonState = BooleanProperty(False)
    def on_activated_state(self, widget):
        if widget.state == "normal":
            self.buttonState = False
        elif widget.state == "down":
            self.buttonState = True

class BoxLayoutExample(BoxLayout):
    pass

class BoxLayoutApp(App):
    pass

BoxLayoutApp().run()

---

BoxLayout.kv

BoxLayoutExample:

<ExternalTrigger@BoxLayout>:
    ToggleButton:
        text: "MainToggle1"
        on_state: root.on_activated_state(self)
        disabled: root.on_activated_state(self)

<BoxLayoutExample@PageLayout>:
    orientation: "vertical"
    BoxLayout:
        orientation: "horizontal"
        ExternalTrigger:
        GridLayout:
            size_hint: 2, 1
            cols: 2
            ToggleButton:
                background_color: (0,0,1)
                text: "Toggle1"
            ToggleButton:
                background_color: (0,1,0)
                text: "Toggle2"
            ToggleButton:
                background_color: (1,0,0)
                text: "Toggle3"
            ToggleButton:
                background_color: (7,1,3)
                text: "Toggle4"

Advice would be appreciated!

Answer 1

Use the id property and a custom class of ToggleButton.

The class you have to add:

class MyToggleButton(ToggleButton):
    # This method will check if all the ToggleButtons are "down" state
    def checkAllButtons(self, btn1, btn2, btn3, btn4):
        if (btn1.state == 'down') and (btn2.state == 'down') and (btn3.state == 'down') and (btn4.state == 'down'):
            return 'down'
        else:
            return 'normal'

In you .kv file add a custom property to the class <ExternalTrigger@BoxLayout>: and bind it to the state of the main ToggleButton:

<ExternalTrigger@BoxLayout>:
    custom: 'normal'
    ToggleButton:
        text: "MainToggle1"
        on_state: root.on_activated_state(self)
        disabled: root.on_activated_state(self)
        state: root.custom

Then add the id to each ToggleButton and evaluate on_press event if the four ToggleButtons are "down" (do this with the method created in the custom class).

Change all the four ToggleButtons you have to the folling:

MyToggleButton:
    id: but1  # Here obviously change the id, for example in ToggleButton2: id=but2
    background_color: (0,0,1)
    text: self.state
    on_press: ext.custom=self.checkAllButtons(but1,but2,but3,but4) #This remains the same for every ToggleButton