void drawKeyFrames(QPainter *painter, QRectF exposedRect);
int mouseOverKeyFrames(QPointF pos, double maxOffset);
virtual void mousePressEvent(QGraphicsSceneMouseEvent * event);
void drawKeyFrames(QPainter *painter, QRectF exposedRect);
int mouseOverKeyFrames(QPointF pos, double maxOffset);
virtual void mousePressEvent(QGraphicsSceneMouseEvent * event);