NSDragging protocol declares methods that supply information about a dragging session.
- macOS 10.0+
NSDragging protocol methods are designed to be invoked from within a class’s implementation of
NSDragging protocol methods. AppKit automatically passes an object that conforms to the
NSDragging protocol as the argument to each of the methods defined by
NSDragging messages should be sent to this object; you never need to create a class that implements the