How can I reference a widget class created in kv file in Python code?

[JB]

I have created a widget in kv file which extends Label and then two more classes that add background_color or border functionality to the label. In kv file it is declared:

<BackgroundColour@Widget>:
    background_color: 0, 0, 0, 0
    canvas.before:
        Color:
            rgba: root.background_color
        Rectangle:
            size: self.size
            pos: self.pos

<Border@Widget>:
    border_color: 0, 0, 0, 0
    border_width: 1
    canvas.before:
        Color:
            rgba: root.border_color
        Line:
            width: root.border_width
            rectangle: self.x, self.y, self.width, self.height

<MyLabel@Label+BackgroundColour+Border>

Is there a way now to reference that MyLabel class in Python code without having to move the BackgroundColour and Border functionality to Python (which I don't want to do because writing canvas.before and binding properties in Python is a pain)?

[Elliot Garbus]

I’m not sure I completely understand your objective, there are a number of ways to move between KV and the Python code.

I have attached a KV file and a py file.  Apologies for the colors, they were the result of random choices.

 

Key concept, you can simply declare the class in python

class BackgroundColour(Widget):
    pass

 

and define the style in kv:

<BackgroundColour>:
    canvas.before:
        Color:
            rgba: root.bg_color
        Rectangle:
            size: self.size
            pos: self.pos

 

Doing this bridges the name space letting you use the names in both KV and Python. 

Let me know if the attached code answers your question.

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[Matthew Einhorn]

Additionally, you should be able to do something like `from kivy.factory import Factory` and then `label = Factory.MyLabel()` or `label = Factory.get('MyLabel')()`.

Matt

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[JB]

Thank you both Elliot and Matt! Elliot's solution is exactly what I needed. I didn't realise I can mix in multiple Widget classes.

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