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96 lines
2.8 KiB
Python
96 lines
2.8 KiB
Python
# Copyright (C) 2007, Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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import time
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import gobject
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EASE_OUT_EXPO = 0
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EASE_IN_EXPO = 1
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class Animator(gobject.GObject):
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__gsignals__ = {
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'completed': (gobject.SIGNAL_RUN_FIRST,
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gobject.TYPE_NONE, ([])),
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}
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def __init__(self, duration, fps=20, easing=EASE_OUT_EXPO):
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gobject.GObject.__init__(self)
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self._animations = []
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self._duration = duration
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self._interval = 1.0 / fps
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self._easing = easing
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self._timeout_sid = 0
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self._start_time = None
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def add(self, animation):
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self._animations.append(animation)
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def remove_all(self):
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self.stop()
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self._animations = []
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def start(self):
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if self._timeout_sid:
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self.stop()
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self._start_time = time.time()
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self._timeout_sid = gobject.timeout_add(
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int(self._interval * 1000), self._next_frame_cb)
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def stop(self):
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if self._timeout_sid:
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gobject.source_remove(self._timeout_sid)
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self._timeout_sid = 0
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self.emit('completed')
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def _next_frame_cb(self):
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current_time = min(self._duration, time.time() - self._start_time)
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current_time = max(current_time, 0.0)
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for animation in self._animations:
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animation.do_frame(current_time, self._duration, self._easing)
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if current_time == self._duration:
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self.stop()
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return False
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else:
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return True
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class Animation(object):
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def __init__(self, start, end):
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self.start = start
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self.end = end
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def do_frame(self, t, duration, easing):
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start = self.start
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change = self.end - self.start
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if t == duration:
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# last frame
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frame = self.end
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else:
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if easing == EASE_OUT_EXPO:
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frame = change * (-pow(2, -10 * t / duration) + 1) + start
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elif easing == EASE_IN_EXPO:
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frame = change * pow(2, 10 * (t / duration - 1)) + start
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self.next_frame(frame)
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def next_frame(self, frame):
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pass
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