How to add a class to the root class?

[Mario]

When clicking a button, I want to add a custom kivy class (<BallImage>) to the root class (MainWidget), but it seems a lot more complicated than it should be..?

• I can't do self.ids.box.add_widget(self.ids.ball) because ID's are not global.
• I only have a complicated solution with Clock.schedule_interval which I'd really like to avoid (aren't there something simpler?).
• As you can see in the code below, self.ids.box.add_widget(BallImage()) doesn't work either.

Help is much appreciated, thanks!

.kv code:

MainWidget:

    BoxLayout:

        id: box

         Button:

             text: "Button"

             on_press: root.add_img()

 

<BallImage@Image>:

    id: ball

    source: "images/ball.png"

.py code:

from kivy.app import App

from kivy.uix.boxlayout import BoxLayout

class BallImage():

    pass

class MainWidget(BoxLayout):

    def add_img(self):

        self.ids.box.add_widget(BallImage())

class ClickApp(App):

    pass

ClickApp().run()

[Elliot Garbus]

You were very close.  You are instancing the BallImage widget in Python, so the inheritance relationship needs to be defined in python.  Notice BallImage is derived from Image.

 

 

Python:

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout

from kivy.uix.image import Image

class BallImage(Image):
    pass

class MainWidget(BoxLayout):
    def add_img(self):
        self.ids.box.add_widget(BallImage())

class ClickApp(App):
    pass

ClickApp().run()

 

kv

 

MainWidget:
    BoxLayout:
        id: box

        Button:
            text: "Button"
            on_press: root

.add_img()

<BallImage>:
    source: "images/ball.png"

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