This informal protocol declares methods that a class must implement to serve as a source of data in dragging operations. This protocol declares a number of methods, but classes need only implement the method draggingSourceOperationMaskForLocal: to be a valid dragging operation source. Classes should implement this method to return a dragging source operation mask, which describes how data should be handled in a dragging operation. See NSDraggingInfo's listing (previously) for more information.

@interface NSObject (NSDraggingSource)
// Instance Methods
- (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)flag;
- (NSArray *)namesOfPromisedFilesDroppedAtDestination:(NSURL *)dropDestination;
- (void)draggedImage:(NSImage *)image beganAt:(NSPoint)screenPoint;
- (void)draggedImage:(NSImage *)image endedAt:(NSPoint)screenPoint operation:(NSDragOperation)operation;
- (void)draggedImage:(NSImage *)image movedTo:(NSPoint)screenPoint;
- (BOOL)ignoreModifierKeysWhileDragging;
- (void)draggedImage:(NSImage *)image endedAt:(NSPoint)screenPoint deposited:(BOOL)flag;
@end