MouseDrag proc (atom)
See also:
Click proc (atom)
MouseDown proc (atom)
MouseDrag proc (client)
MouseDrop proc (atom)
MouseEntered proc (atom)
MouseExited proc (atom)
MouseUp proc (atom)
mouse_drag_pointer var (atom)
mouse_drop_pointer var (atom)
mouse_drop_zone var (atom)
mouse_opacity var (atom)
mouse_over_pointer var (atom)
Format:
MouseDrag(over_object,src_location,over_location)
Args:
over_object: the object under the mouse pointer
src_location: the turf or stat panel from where the src object was dragged
over_location: the turf or stat panel containing the object under the mouse pointer
This is called while dragging this object by pressing and holding the left mouse button over the object and moving the mouse. The over_object may be null if dragging over a stat panel or over other empty space.

Don't define this unless you need it, because it generates extra communication that is otherwise avoided. Most operations can be done through Click(), DblClick(), and MouseDrop(). The other procedures are simply available for completeness.