#!/usr/bin/python

# version: 2021.09.11

# author: Martin Kraemer, mk.maddin@gmail.com

# description:

# General event object class - https://emptypage.jp/notes/pyevent.en.html

class Event(object):

def __init__(self, doc=None):

self.__doc__ = doc

def __get__(self, obj, objtype=None):

if obj is None:

return self

return EventHandler(self, obj)

def __set__(self, obj, value):

pass

class EventHandler(object):

def __init__(self, event, obj):

self.event = event

self.obj = obj

def _getfunctionlist(self):

"""(internal use) """

try:

eventhandler = self.obj.__eventhandler__

except AttributeError:

eventhandler = self.obj.__eventhandler__ = {}

return eventhandler.setdefault(self.event, [])

def add(self, func):

"""Add new event handler function.

Event handler function must be defined like func(sender, earg).

You can add handler also by using '+=' operator.

"""

self._getfunctionlist().append(func)

return self

def remove(self, func):

"""Remove existing event handler function.

You can remove handler also by using '-=' operator.

"""

self._getfunctionlist().remove(func)

return self

def fire(self, earg=None):

"""Fire event and call all handler functions

You can call EventHandler object itself like e(earg) instead of

e.fire(earg).

"""

for func in self._getfunctionlist():

func(self.obj, earg)

__iadd__ = add

__isub__ = remove

__call__ = fire

class dScriptEventObj(object):

event = Event(None)

def __init__(self, SENDER=None, TOPIC=None, IDENTIFIER=None, VALUE=None):

self.sender=SENDER

self.topic=TOPIC

self.identifier=IDENTIFIER

self.value=VALUE

def throw(self):

self.event()