c_gdk_drag_motion

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
int function(GdkDragContext* context, GdkWindow* destWindow, GdkDragProtocol protocol, int xRoot, int yRoot, GdkDragAction suggestedAction, GdkDragAction possibleActions, uint time) c_gdk_drag_motion;

Meta