Explanation of using new events on_kv_post / apply_class_lang_rules in new version 1.11.0

[Walmir Paiva]

I would like more explanations about the use of these changes in the new version 1.11.0.
Sorry, but the documentation was not very friendly with me ... :)
I followed PR's #6221 / #6257 and I believe these new features can help me with my project.

My implementation for managing widget initialization is as follows:

class MyWidget(widget):
    property_1 = StringProperty('')
    property_2 = ObjectProperty(None, allownone=True)
   
    def __init__(self, **kwargs):
        super(MyWidget self).__init__(**kwargs)
        self.init_widget()
   
    @mainthread
    def _init_widget(self):
        if self.property_1 != '':
            self.do_something()
        else:
            self.do_something_else()
       
        self.bind(property_2 = self.do_process)
    ...
   
#example of instantiation
wid = MyWidget()
wid.property_1 = 'test'
wid.property_2 = any_object
...

How do I replace this implementation of mine with new events?
If anyone can explain me or post some example would be of great help.

Thank's