Kivy: how to use canvas for widgets created in python

Question

I would like to add a canvas to my checkboxes to change their color. I have found this answer, but I am struggling to implement it. My checkboxes are created in python with thi

Answer 1

You should use the with statement from your python code

with checkb.canvas:
    Color(1., 1., 0)
    Rectangle(size=(50, 50))

Your other approach seems better, just fix it a bit:

Builder.load_string('''
<CustomCk>:
    canvas.before:
        Color:
            rgb: 1,0,0
        Rectangle:
            pos:self.center_x-8, self.center_y-8
            size:[16,16]
        Color:
            rgb: 0,0,0
        Rectangle:
            pos:self.center_x-7, self.center_y-7
            size:[14,14]                

    ''')

class CustomCk(CheckBox): #define the class in the python file... 
     pass

checkb= CustomCk()
layout.add_widget(checkb)