Debug Kivy Widgets

gistfile1.py

# DEBUG ALL WIDGETS
<Widget>:
    canvas.after:
        Line:
            rectangle: self.x+1, self.y+1, self.width-1, self.height-1
            dash_offset: 5
            dash_length: 3

# DEBUG A SINGLE WIDGET
    canvas.after:
        Color:
            rgba: 1, 0, 0, 0.5
        Line:
            rectangle: self.x+1, self.y+1, self.width-1, self.height-1
        Color:
            rgba: 0, 0, 1, 0.3
        Rectangle:
            pos: self.pos
            size: self.size