baseimage-tutorial-framework/lib/tfw/mixins/callback_mixin.py

30 lines
889 B
Python

# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
# All Rights Reserved. See LICENSE file for details.
from functools import partial
from tfw.decorators import LazyInitialise
class CallbackMixin:
@LazyInitialise
def _callbacks(self):
return []
def subscribe_callback(self, callback, *args, **kwargs):
"""
Subscribe a callable to invoke once an event is triggered.
:param callback: callable to be executed on events
:param *args: arguments passed to callable
:param **kwargs: kwargs passed to callable
"""
fun = partial(callback, *args, **kwargs)
self._callbacks.append(fun)
def unsubscribe_callback(self, callback):
self._callbacks.remove(callback)
def _execute_callbacks(self, *args, **kwargs):
for callback in self._callbacks:
callback(*args, **kwargs)