88 lines
2.1 KiB
Python
88 lines
2.1 KiB
Python
import gobject
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class _Tag:
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def __init__(self, name, start_frame, end_frame):
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self.name = name
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self.start_frame = start_frame
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self.end_frame = end_frame
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class TimelineObserver:
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def __init__(self, observer):
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self._observer = observer
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def next_frame(self, tag, current_frame, n_frames):
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try:
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method = getattr(self._observer, 'do_' + tag)
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method(current_frame, n_frames)
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except:
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pass
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class Timeline:
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def __init__(self, observer):
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self._fps = 12
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self._tags = []
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self._name_to_tag = {}
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self._current_frame = 0
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self._timeout_sid = 0
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self._observer = TimelineObserver(observer)
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def add_tag(self, name, start_frame, end_frame):
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tag = _Tag(name, start_frame, end_frame)
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self._tags.append(tag)
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self._name_to_tag[name] = tag
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def remove_tag(self, name):
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tag = self._tags[name]
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self._tags.remove(tag)
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del self._tags[name]
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def _next_frame(self, tag, frame):
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n_frames = tag.start_frame - tag.end_frame
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self._observer.next_frame(tag.name, frame, n_frames)
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def on_tag(self, name):
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tag = self._name_to_tag[name]
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return (tag.start_frame <= self._current_frame and \
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tag.end_frame >= self._current_frame)
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def _get_tags_for_frame(self, frame):
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result = []
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for tag in self._tags:
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if tag.start_frame <= frame and tag.end_frame >= frame:
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result.append(tag)
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return result
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def _timeout_cb(self, end_frame):
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for tag in self._get_tags_for_frame(self._current_frame):
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cur_frame = self._current_frame - tag.start_frame
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self._next_frame(tag, cur_frame)
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if self._current_frame < end_frame:
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self._current_frame += 1
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return True
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else:
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return False
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def play(self, start_tag=None, stop_tag=None):
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self.stop()
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if start_tag == None:
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start = self._tags[0].start_frame
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else:
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start = self._name_to_tag[start_tag].start_frame
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if stop_tag == None:
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end = self._tags[len(self._tags) - 1].end_frame
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else:
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end = self._name_to_tag[stop_tag].end_frame
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self._current_frame = start
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interval = 1000 / self._fps
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self._timeout_sid = gobject.timeout_add(
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interval, self._timeout_cb, end)
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def stop(self):
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if self._timeout_sid > 0:
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gobject.source_remove(self._timeout_sid)
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