from kivy.app import App
from kivy.lang import Builder
from time import time
from kivy.uix.label import Label
from kivy.uix.boxlayout import BoxLayout
import kivy.properties as kp
from setproperty import SetProperty

Builder.load_string('''
<Foo>:
    orientation: 'vertical'
    text: ''

    BoxLayout:
        orientation: 'horizontal'

        ToggleButton:
            id: btn_add
            group: 'action'
            text: 'add'
            state: 'down'

        ToggleButton:
            group: 'action'
            text: 'delete'

    TextInput
        id: value

    Button:
        on_press: root.update_dict(btn_add.state == 'down', value.text)
        text: 'change set'

    Label:
        id: dictout
        text: root.text

''')


class Foo(BoxLayout):

    text = kp.StringProperty()
    my_set = SetProperty()

    def on_my_set(self, wx, my_set):
        self.text = str(time()) + ' ' + str(my_set)

    def update_dict(self, add, value):
        if add:
            self.my_set.add(value)
        else:
            self.my_set.discard(value)


class TestApp(App):
    def build(self):
        return Foo()

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