void resizeClip ( const QPointF &startPos, const QPointF &endPos, bool resizeClipStart );
void addClip ( QDomElement xml, int clipId, int track, int startpos, const QRectF &rect, int duration);
void deleteClip ( int track, int startpos, const QRectF &rect );
void resizeClip ( const QPointF &startPos, const QPointF &endPos, bool resizeClipStart );
void addClip ( QDomElement xml, int clipId, int track, int startpos, const QRectF &rect, int duration);
void deleteClip ( int track, int startpos, const QRectF &rect );