How to change widget background in kivy?

Question

Python

The examples give something similar, but what should I do if I do not specify the exact position of the widgets.

from kivy.graphics import *
with self.canvas:
    # Add a red color
    Color(1., 0, 0)

    # Add a rectangle
    Rectangle(pos=(10, 10), size=(500, 500))

When I try to use this:

with logo_background.canvas:
            Color(.29, .46, .66, 1)
            Rectangle(pos = logo_background.pos, size = logo_background.size)

it just creates a 100x100 square in the left corner.

Answer 1

Found as for me a very crutch solution

class LogoBackground(Label):
    def on_size(self, *args):
        self.canvas.before.clear()
        with self.canvas.before:
            Color(.29, .46, .66, 1)
            Rectangle(pos=self.pos, size=self.size)

logo = LogoBackground(text = "text", size_hint = (1, .05))

at the same time, in theory, the same option does not work (creates a square 100 by 100)

logo = Label(text = "Text", size_hint = (1, .05))
with logo.canvas.before:
    Color(.29, .46, .66, 1)
    Rectangle(pos=logo.pos, size=logo.size)

Maybe someone can explain why this is so or how to make it less miserable.

Answer 2

You may not be passing the first argument, which is needed in a procedure call. Manual .