void OnDragLeft(bool draw, double x, double y, int keys=0, int attachment = 0);
void OnBeginDragLeft(double x, double y, int keys=0, int attachment = 0);
void OnEndDragLeft(double x, double y, int keys=0, int attachment = 0);
void OnDragLeft(bool draw, double x, double y, int keys=0, int attachment = 0);
void OnBeginDragLeft(double x, double y, int keys=0, int attachment = 0);
void OnEndDragLeft(double x, double y, int keys=0, int attachment = 0);