test_theme.py

'''Theme object example
'''
from kivy.app import App
from kivy.lang import Builder
from kivy import properties as P
from kivy.lang.parser import global_idmap
from kivy.event import EventDispatcher


KV = '''
<AppLabel@Label>:
    font_size: theme.font_size_1
    color: theme.color_primary

<AppTitle@Label>:
    font_size: theme.font_size_2
    color: theme.color_secondary

<AppButton@Button>:
    font_size: theme.font_size_1

BoxLayout:
    orientation: 'vertical'
    canvas.before:
        Color:
            rgba: theme.background_color
        Rectangle:
            pos: self.pos
            size: self.size

    AppTitle:
        text: 'App title'

    AppLabel:
        text: 'app label'

    AppButton:
        text: 'app button'
'''


class Theme(EventDispatcher):
    font_size_1 = P.NumericProperty(26)
    font_size_2 = P.NumericProperty(32)
    background_color = P.ColorProperty("#BBBBBB")
    color_primary = P.ColorProperty("#223344")
    color_secondary = P.ColorProperty("#334455")


global_idmap['theme'] = theme = Theme()


class Application(App):
    def build(self):
        return Builder.load_string(KV)


if __name__ == "__main__":
    Application().run()