ClipItem *getClipItemAt(GenTime pos, int track);
ClipItem *getClipItemAtEnd(GenTime pos, int track);
ClipItem *getClipItemAtStart(GenTime pos, int track);
+ Transition *getTransitionItem(TransitionInfo info);
Transition *getTransitionItemAt(int pos, int track);
Transition *getTransitionItemAt(GenTime pos, int track);
Transition *getTransitionItemAtEnd(GenTime pos, int track);