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#!/usr/bin/env python
#
# Copyright (C) 2007-2009, Joseph C. Lee
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
from gi.repository import GObject
# Animation timer interval (in msec)
_TIMER_INTERVAL = 20
class Anim(object):
"""Manages an animation."""
def __init__(self, update_func, end_anim_func):
"""update_func is a function returns True if the animation should
continue, False otherwise. end_anim_func is a function that takes a
boolean indicating whether the animation was stopped prematurely."""
self._update_func = update_func
self._end_anim_func = end_anim_func
self._animating = False
def start(self):
self._animating = True
self._update_func()
GObject.timeout_add(_TIMER_INTERVAL, self._timer)
def stop(self):
if self._animating:
self._end_anim(anim_stopped=True)
def _timer(self):
if not self._animating:
return False
if self._update_func():
return True
self._end_anim(anim_stopped=False)
return False
def _end_anim(self, anim_stopped):
self._animating = False
self._end_anim_func(anim_stopped=anim_stopped)
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