Change label text after object attribute change

[Ricardo Couto]

Hello all!

Suppose I have the following code:

class Person(object):
    def __init__(self, name):
        self.name = name


    def change_name(self, *args, **kwargs):
        self.name = "Jill"


class MyApp(App):
    def build(self):
        p = Person("Jack")
        return Button(text=p.name, on_press=p.change_name)


if __name__ == '__main__':
    MyApp().run()

How can I make it so that when I press the button the person name changes and the button text changes too?

Thanks!

[Rick Kreifeldt]

First I'd make name a String Property in Person

Then it were me I'd either:

1) Make Person a Subclass of button so it can change it's name and set the button

2) Subclass Button, add a reference to Person, have the button change the person name when it's text changes (I use this technique the most)

3) Add a function in MyApp that changes the name, something like this:

class Person(object):

    name = StringProperty()
    def __init__(self, name='Jack'):

        self.name = name


    def change_name(self, *args, **kwargs):

        if self.name == 'Jack'
            self.name = "Jill"

        else:

            self.name = Jack

class MyApp(App):
    def build(self):
        self.p = Person("Jack")

        self.button = Button(text=p.name, on_press=self.p.change_name)

        self.p.bind(name=self.change_button_text)
        return self.button

    def change_button_text(self, n):

        self.button.text = n

You can do this is a more sophisticated way with less code all within .kv language, but this is easy to follow as you get started.  

[Elliot Garbus]

Change name to a kivy property 

class Person(object):


      name=StringProperty(‘’)

    def __init__(self, name):
        self.name = name


Sent from my iPad

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