AttributeError: 'myApp' object has no attribute 'to_window'

[Frédéric]

Hi everyone,

For a desktop application, I wanted to provide a way to have a default button, fired when I press enter.

The solution I found works perfectly, but has a strange (for me) effect: If I try to move the window, the program crash with the error :

AttributeError: 'myApp' object has no attribute 'to_window'

Here is a minimal exemple

file pbme_to_window.py

from kivy.app import App
from kivy.app import Builder
from kivy.core.window import Window

class myApp(App):
    def __init__(self, **kwargs):
        super(myApp, self).__init__(**kwargs)
        self._keyboard = Window.request_keyboard(self._keyboard_closed, self)
        self._keyboard.bind(on_key_down=self._on_keyboard_down)

    def _keyboard_closed(self):
        self._keyboard.unbind(on_key_down=self._on_keyboard_down)
        self._keyboard = None

    def build(self):
        kv = Builder.load_file('pbme_to_window.kv')
        return kv

    def _on_keyboard_down(self, keyboard, keycode, text, modifiers):
        if keycode[1] == 'enter':
           saisie()

    def saisie(self):
        print('Le bouton a été pressé')

if __name__ == '__main__':
    myApp().run()

file pbme_to_window.kv

BoxLayout:
    orientation: "vertical"
    BoxLayout:
        size_hint: 1, .1
        orientation: "horizontal"
        Label:
            size_hint : 3, 1
            text: "Titre"
    BoxLayout:
        orientation: "horizontal"
    BoxLayout:
        orientation: "horizontal"
        size_hint: 1, .2
        BoxLayout:
            orientation: "vertical"
            size_hint: (0.2, 1)
            Button:
                size_hint_x: 0.25
                pos_hint: {'center_x':0.5, 'center_y': 0.5}
                text: "Bouton"
                on_release: app.saisie()

If i delete the 2 lines keyboard from __init__ I can move the window without problem...

Frederic

[ELLIOT GARBUS]





I don’t have a computer right now to test this but I suspect the problem is:

self._keyboard = Window.request_keyboard(self._keyboard_closed, self)

The last parameter should be a Widget, in this context self is the instance of App. Replace self with self.root

I also suggest you move this code from __init__() to on_start(). The root widget is set when build returns. 

Let me know if that helps. 

Sent from my iPhone

On Jun 19, 2025, at 1:40 PM, Frédéric <freder...@gmail.com> wrote:

Hi everyone,

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[Frédéric]

Thanks Elliot,

It works perfectly now!

You're amazing...

Frederic