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import gobject
class Timeline(gobject.GObject):
__gsignals__ = {
'next-frame': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ([int])),
'completed': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ([]))
}
def __init__(self, stage, n_frames):
gobject.GObject.__init__(self)
self._stage = stage
self._fps = stage.get_fps()
self._n_frames = n_frames
self._current_frame = 0
def start(self):
gobject.timeout_add(1000 / self._fps, self.__timeout_cb)
def get_n_frames(self):
return self._n_frames
def __timeout_cb(self):
self.emit('next-frame', self._current_frame)
# FIXME skip frames if necessary
self._current_frame += 1
if self._current_frame < self._n_frames:
return True
else:
self.emit('completed')
return False
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