anim system first steps

main.py

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.label import Label

from kivy.properties import StringProperty, ObjectProperty

from kivy.animation import Animation

from functools import partial

KV = """
MyLabel

<MyLabel>
    pos_hint: {'center': (0.5,0.5)}
    size_hint: 0.5, 0.5
    text: '123456'
    anim: 'GrowAnim'

    canvas.before:
        Color:
            rgba: 0.4,0.3,0.5,1
        Rectangle:
            pos: self.pos
            size: self.size

"""

class AnimBase():

    def __init__(self, **kwargs):
        self.widget = kwargs.get('widget', False)
        #if not self.widget: return 


        self.binds = {}


    def set_anim(self):
        widget = self.widget

        self.prepare_anim()
        self.set_properties()
        self.set_binds()



    def prepare_anim(self):
        Animation.stop_all(self.widget)


    def set_properties(self):
        pass


    def set_binds(self):

        widget = self.widget

        cls = self.__class__


        for event_name, anim_props in self.binds.items():
            widget.bind(**{event_name: partial( self.animate, widget, anim_props)} )



    def animate(self, widget, anim_props, *_):
        Animation(**anim_props).start(widget)
        #TODO:
            # +&
            # create_properties (if don't exist)
            # create_events (if don't exist)
            # create_widgets (if don't exist)
            # unbind?
        

class GrowAnim(AnimBase):

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        #actually this is not grow anim, just an example
        self.binds = {'on_touch_down': {'x':400, 't':'out_elastic', 'd':.4}}
    



    def set_scale_y():
        pass

    def set_scale_x():
        pass





class AnimBhv():
    anim = StringProperty()

    def on_anim(self, inst, anim_name):
        anim_cls = globals()[anim_name]
        anim_inst = anim_cls (widget = self)
        anim_inst.set_anim()

    def test(self, event_name, method):
        self.bind(**{event_name: method})

class MyLabel(AnimBhv, Label):

    def __init__(self, **kwargs):
        super().__init__(**kwargs)


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


MyApp().run()