virtual void point_drag(ControlPoint&, nframes_t x, float, bool with_push);
virtual void end_drag (ControlPoint*);
virtual void line_drag(uint32_t i1, uint32_t i2, float, bool with_push);
virtual void point_drag(ControlPoint&, nframes_t x, float, bool with_push);
virtual void end_drag (ControlPoint*);
virtual void line_drag(uint32_t i1, uint32_t i2, float, bool with_push);