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# Copyright 2010-2011 Florent Le Coz <louiz@louiz.org>
#
# This file is part of Poezio.
#
# Poezio is free software: you can redistribute it and/or modify
# it under the terms of the zlib license. See the COPYING file.
"""
To use these, just use core.add_timed_event(event)
where event is an instance of one of these classes
"""
import logging
log = logging.getLogger(__name__)
import datetime
class TimedEvent(object):
"""
An event with a callback that is called when the specified time is passed
Note that these events can NOT be used for very small delay or a very
precise date, since the check for events is done once per second, as
a maximum.
The callback and its arguments should be passed as the lasts arguments.
"""
def __init__(self, date, callback, *args):
self._callback = callback
self.args = args
self.repetive = False
self.next_call_date = date
def __call__(self):
"""
the call should return False if this event should be remove from
the events list.
If it’s true, the date should be updated beforehand to a later date,
or else it will be called every second
"""
self._callback(*self.args)
return self.repetive
def has_timed_out(self, current_date):
"""
returns True if the callback should be called
"""
if self.next_call_date < current_date:
return True
else:
return False
def change_date(self, date):
"""
Simply change the date of the event
"""
self.next_call_date = date
def add_delay(self, delay):
"""
Add a delay (in seconds) to the date
"""
self.next_call_date += datetime.timedelta(seconds=delay)
class DelayedEvent(TimedEvent):
"""
The date is calculated from now + a delay in seconds
Use it if you want an event to happen in, e.g. 6 seconds
"""
def __init__(self, delay, callback, *args):
date = datetime.datetime.now() + datetime.timedelta(seconds=delay)
TimedEvent.__init__(self, date, callback, *args)
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