source: listenerpy/tudelft_utilities_listener/Listenable.py

from abc import  abstractmethod
from abc import ABC
from typing import TypeVar, Generic, List

from tudelft_utilities_listener.Listener import Listener


TYPE= TypeVar('TYPE')

class Listenable (ABC, Generic[TYPE]):
        '''
        Simple reusable listenable
        @param <TYPE> the type of the data being passed around.
        '''
        @abstractmethod
        def addListener(self, l:Listener[TYPE]):
                '''
                Add listener for this observable
                
                @param l the listener to add
                '''

        @abstractmethod
        def removeListener(self, l:Listener[TYPE] ):
                '''
                Remove listener for this observable
                 
                @param l the listener to remove
                '''