# Deprecated symbols Review symbols that are no longer in active development, and their recommended replacements. ## Overview Although these symbols are available for use, Apple is no longer actively developing them, and may remove them in a future release. Apple recommends moving away from these symbols and using their indicated replacements instead. Check the individual symbol pages for the recommended replacements. ## Topics ### Deprecated constants [`static const NSEventMask NSLeftMouseDownMask;`](/documentation/AppKit/NSLeftMouseDownMask) A mask for left mouse-down events. [`static const NSEventMask NSLeftMouseUpMask;`](/documentation/AppKit/NSLeftMouseUpMask) A mask for left mouse-up events. [`static const NSEventMask NSRightMouseDownMask;`](/documentation/AppKit/NSRightMouseDownMask) A mask for right mouse-down events. [`static const NSEventMask NSRightMouseUpMask;`](/documentation/AppKit/NSRightMouseUpMask) A mask for right mouse-up events. [`static const NSEventMask NSOtherMouseDownMask;`](/documentation/AppKit/NSOtherMouseDownMask) A mask for other mouse-down events. [`static const NSEventMask NSOtherMouseUpMask;`](/documentation/AppKit/NSOtherMouseUpMask) A mask for other mouse-up events. [`static const NSEventMask NSMouseMovedMask;`](/documentation/AppKit/NSMouseMovedMask) A mask for mouse-moved events. [`static const NSEventMask NSLeftMouseDraggedMask;`](/documentation/AppKit/NSLeftMouseDraggedMask) A mask for left mouse-dragged events. [`static const NSEventMask NSRightMouseDraggedMask;`](/documentation/AppKit/NSRightMouseDraggedMask) A mask for right mouse-dragged events. [`static const NSEventMask NSOtherMouseDraggedMask;`](/documentation/AppKit/NSOtherMouseDraggedMask) A mask for other mouse-dragged events. [`static const NSEventMask NSMouseEnteredMask;`](/documentation/AppKit/NSMouseEnteredMask) A mask for mouse-entered events. [`static const NSEventMask NSMouseExitedMask;`](/documentation/AppKit/NSMouseExitedMask) A mask for mouse-exited events. [`static const NSEventMask NSCursorUpdateMask;`](/documentation/AppKit/NSCursorUpdateMask) A mask for cursor-update events. [`static const NSEventMask NSKeyDownMask;`](/documentation/AppKit/NSKeyDownMask) A mask for key-down events. [`static const NSEventMask NSKeyUpMask;`](/documentation/AppKit/NSKeyUpMask) A mask for key-up events. [`static const NSEventMask NSFlagsChangedMask;`](/documentation/AppKit/NSFlagsChangedMask) A mask for flags-changed events. [`static const NSEventMask NSAppKitDefinedMask;`](/documentation/AppKit/NSAppKitDefinedMask) A mask for AppKit-defined events. [`static const NSEventMask NSSystemDefinedMask;`](/documentation/AppKit/NSSystemDefinedMask) A mask for system-defined events. [`static const NSEventMask NSApplicationDefinedMask;`](/documentation/AppKit/NSApplicationDefinedMask) A mask for app-defined events. [`static const NSEventMask NSPeriodicMask;`](/documentation/AppKit/NSPeriodicMask) A mask for periodic events. [`static const NSEventMask NSScrollWheelMask;`](/documentation/AppKit/NSScrollWheelMask) A mask for scroll-wheel events. [`static const NSEventMask NSTabletPointMask;`](/documentation/AppKit/NSTabletPointMask) A mask for tablet-point events. [`static const NSEventMask NSTabletProximityMask;`](/documentation/AppKit/NSTabletProximityMask) A mask for tablet-proximity events. [`static const NSEventMask NSAnyEventMask;`](/documentation/AppKit/NSAnyEventMask) A mask that matches any type of event. ### Deprecated symbols [`static var beginGesture: NSEvent.EventTypeMask`](/documentation/AppKit/NSEvent/EventTypeMask/beginGesture) A mask for begin-gesture events. [`static var endGesture: NSEvent.EventTypeMask`](/documentation/AppKit/NSEvent/EventTypeMask/endGesture) A mask for end-gesture events. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)