avoid parent.parent with properties or other ways

[Gouz]

I made this example: https://gist.github.com/gouzouni/d56eaa144f9f4f3fe7d6

Thx to inclement's notice, I realized I was using some properties  the wrong way in my code. However, how could I make proper use of them and avoid parent.parent. ? Both python/kv side.

Advise I got (if I understood correctly) was to capture self into an object property.

Anyway, what is the proper way to get rid of parent.parent ?
Any example would be truly appriciated.

Also, I guess to navigate the widget tree one could make use of app in kv and get_running_app() in python which would get you right to the top. However I failed making that work too. (If possible, how could I use this way here too?)

All kind of corrections are trully welcome. Trying to learn some more about kivy power.

Thxxx

[sk7...@gmail.com]

You don't need to reference an object explicitly when binding a property to a KV id as far as I know.

The code below should link the object Button to the property first_level_button

#kv language example

<MainWindow>:

    first_lvl_button: first_lvl_button

    first_lvl: first_lvl

 

    FirstLevel:

        id: first_lvl

        orientation: "vertical"

    Button:

        id: first_lvl_button

        text: "Copy Label"

        on_release: root.copy_lbl()

 

# ... code removed

In order to prevent parent.parent syntax you could do this instead:

class CIMgui(App):

    def build(self):

        return MainWindow()

 

if __name__ == '__main__':
    maininstance = CIMgui()
    maininstance.run()

Your core App is now referable through the maininstance variable from anywhere in the python or KV code.

<SecondLevel>:

    second_lvl_label: second_lvl_label.__self__

 

    Label:

        id: second_lvl_label

        text: str(root.bool)

    Button:

        # OLD CODE
        #text: str(root.parent.parent.counter)

        text: str(app.root.counter)

        on_release: root.print_count()

[Gouz]

I get AttributeError: 'NoneType' object has no attribute 'counter'

[ZenCODE]

sk7 is on the right track here. Try changing that line to:

    text: str(app.root.counter) if app.root else ""