gistfile1.txt

    // For APIs introduced in Mac OS X 10.6 and later, this type is used with NS*Mask constants to indicate the events of interest.
    typedef NS_OPTIONS(unsigned long long, NSEventMask) { /* masks for the types of events */
        NSLeftMouseDownMask         = 1 << NSLeftMouseDown,
        NSLeftMouseUpMask           = 1 << NSLeftMouseUp,
        NSRightMouseDownMask        = 1 << NSRightMouseDown,
        NSRightMouseUpMask          = 1 << NSRightMouseUp,
        NSMouseMovedMask            = 1 << NSMouseMoved,
        NSLeftMouseDraggedMask      = 1 << NSLeftMouseDragged,
        NSRightMouseDraggedMask     = 1 << NSRightMouseDragged,
        NSMouseEnteredMask          = 1 << NSMouseEntered,
        NSMouseExitedMask           = 1 << NSMouseExited,
        NSKeyDownMask               = 1 << NSKeyDown,
        NSKeyUpMask                 = 1 << NSKeyUp,
        NSFlagsChangedMask          = 1 << NSFlagsChanged,
        NSAppKitDefinedMask         = 1 << NSAppKitDefined,
        NSSystemDefinedMask         = 1 << NSSystemDefined,
        NSApplicationDefinedMask    = 1 << NSApplicationDefined,
        NSPeriodicMask              = 1 << NSPeriodic,
        NSCursorUpdateMask          = 1 << NSCursorUpdate,
        NSScrollWheelMask           = 1 << NSScrollWheel,
        NSTabletPointMask           = 1 << NSTabletPoint,
        NSTabletProximityMask       = 1 << NSTabletProximity,
        NSOtherMouseDownMask        = 1 << NSOtherMouseDown,
        NSOtherMouseUpMask          = 1 << NSOtherMouseUp,
        NSOtherMouseDraggedMask     = 1 << NSOtherMouseDragged,
        /* The following event masks are available on some hardware on 10.5.2 and later */
        NSEventMaskGesture NS_ENUM_AVAILABLE_MAC(10_5)          = 1 << NSEventTypeGesture,
        NSEventMaskMagnify NS_ENUM_AVAILABLE_MAC(10_5)          = 1 << NSEventTypeMagnify,
        NSEventMaskSwipe NS_ENUM_AVAILABLE_MAC(10_5)            = 1U << NSEventTypeSwipe,
        NSEventMaskRotate NS_ENUM_AVAILABLE_MAC(10_5)           = 1 << NSEventTypeRotate,
        NSEventMaskBeginGesture NS_ENUM_AVAILABLE_MAC(10_5)     = 1 << NSEventTypeBeginGesture,
        NSEventMaskEndGesture NS_ENUM_AVAILABLE_MAC(10_5)       = 1 << NSEventTypeEndGesture,
       
    #if __LP64__
        /* Note: You can only use these event masks on 64 bit. In other words, you cannot setup a local, nor global, event monitor for these event types on 32 bit. Also, you cannot search the event que for them (nextEventMatchingMask:...) on 32 bit.
         */
        NSEventMaskSmartMagnify NS_ENUM_AVAILABLE_MAC(10_8) = 1ULL << NSEventTypeSmartMagnify,
        NSEventMaskPressure NS_ENUM_AVAILABLE_MAC(10_10_3) = 1ULL << NSEventTypePressure,
    #endif
       
        NSAnyEventMask              = NSUIntegerMax
    };
     
     
    #if __LP64__
    NS_INLINE NSEventMask NSEventMaskFromType(NSEventType type) { return (1UL << type); }
    #else
    NS_INLINE NSEventMask NSEventMaskFromType(NSEventType type) { return (1 << type); }
    #endif 

dont delete. this is for objc mouse block stuff, i reference this