# Related UI Manage contextual menus, cursors, tool tips, and other system-provided windows and content. ## Topics ### Managing Contextual Menus [`func menu(for: NSEvent) -> NSMenu?`](/documentation/AppKit/NSView/menu(for:)) Overridden by subclasses to return a context-sensitive pop-up menu for a given mouse-down event. [`class var defaultMenu: NSMenu?`](/documentation/AppKit/NSView/defaultMenu) Overridden by subclasses to return the default pop-up menu for instances of the receiving class. [`func willOpenMenu(NSMenu, with: NSEvent)`](/documentation/AppKit/NSView/willOpenMenu(_:with:)) Called just before a contextual menu for a view is opened on screen. [`func didCloseMenu(NSMenu, with: NSEvent?)`](/documentation/AppKit/NSView/didCloseMenu(_:with:)) Called after a contextual menu that was displayed from the receiving view has been closed. ### Responding to Cursor Movements [`func addCursorRect(NSRect, cursor: NSCursor)`](/documentation/AppKit/NSView/addCursorRect(_:cursor:)) Establishes the cursor to be used when the mouse pointer lies within a specified region. [`func removeCursorRect(NSRect, cursor: NSCursor)`](/documentation/AppKit/NSView/removeCursorRect(_:cursor:)) Completely removes a cursor rectangle from the view. [`func discardCursorRects()`](/documentation/AppKit/NSView/discardCursorRects()) Invalidates all cursor rectangles set up using [`addCursorRect(_:cursor:)`](/documentation/AppKit/NSView/addCursorRect(_:cursor:)). [`func resetCursorRects()`](/documentation/AppKit/NSView/resetCursorRects()) Overridden by subclasses to define their default cursor rectangles. ### Providing a Tool Tip [`var toolTip: String?`](/documentation/AppKit/NSView/toolTip) The text for the view’s tooltip. [`func addToolTip(NSRect, owner: Any, userData: UnsafeMutableRawPointer?) -> NSView.ToolTipTag`](/documentation/AppKit/NSView/addToolTip(_:owner:userData:)) Creates a tooltip for a defined area in the view and returns a tag that identifies the tooltip rectangle. [`func removeAllToolTips()`](/documentation/AppKit/NSView/removeAllToolTips()) Removes all tooltips assigned to the view. [`func removeToolTip(NSView.ToolTipTag)`](/documentation/AppKit/NSView/removeToolTip(_:)) Removes the tooltip identified by specified tag. [`typealias ToolTipTag`](/documentation/AppKit/NSView/ToolTipTag) This type describes the rectangle used to identify a tooltip rectangle. ### Displaying Definition Windows [`func showDefinition(for: NSAttributedString?, at: NSPoint)`](/documentation/AppKit/NSView/showDefinition(for:at:)) Shows a window displaying the definition of the attributed string at the specified point. [`func showDefinition(for: NSAttributedString?, range: NSRange, options: [NSView.DefinitionOptionKey : Any]?, baselineOriginProvider: ((NSRange) -> NSPoint)?)`](/documentation/AppKit/NSView/showDefinition(for:range:options:baselineOriginProvider:)) Shows a window displaying the definition of the specified range of the attributed string. [`struct DefinitionOptionKey`](/documentation/AppKit/NSView/DefinitionOptionKey) Keys to include in your definition. [`struct DefinitionPresentationType`](/documentation/AppKit/NSView/DefinitionPresentationType) Presentation options for the window. ### Getting the Focus View [`class var focusView: NSView?`](/documentation/AppKit/NSView/focusView) The currently focused view object. ### Synchronizing with Ruler Views [`func rulerView(NSRulerView, didAdd: NSRulerMarker)`](/documentation/AppKit/NSView/rulerView(_:didAdd:)) Informs the client that `aRulerView` allowed the user to add `aMarker`. [`func rulerView(NSRulerView, didMove: NSRulerMarker)`](/documentation/AppKit/NSView/rulerView(_:didMove:)) Informs the client that `aRulerView` allowed the user to move `aMarker`. [`func rulerView(NSRulerView, didRemove: NSRulerMarker)`](/documentation/AppKit/NSView/rulerView(_:didRemove:)) Informs the client that `aRulerView` allowed the user to remove `aMarker`. [`func rulerView(NSRulerView, handleMouseDownWith: NSEvent)`](/documentation/AppKit/NSView/rulerView(_:handleMouseDownWith:)) Informs the client that the user has pressed the mouse button while the cursor is in the ruler area of `aRulerView`. [`func rulerView(NSRulerView, locationFor: NSPoint) -> CGFloat`](/documentation/AppKit/NSView/rulerView(_:locationFor:)) [`func rulerView(NSRulerView, pointForLocation: CGFloat) -> NSPoint`](/documentation/AppKit/NSView/rulerView(_:pointForLocation:)) [`func rulerView(NSRulerView, shouldAdd: NSRulerMarker) -> Bool`](/documentation/AppKit/NSView/rulerView(_:shouldAdd:)) Requests permission for `aRulerView` to add `aMarker`, an NSRulerMarker being dragged onto the ruler by the user. [`func rulerView(NSRulerView, shouldMove: NSRulerMarker) -> Bool`](/documentation/AppKit/NSView/rulerView(_:shouldMove:)) Requests permission for `aRulerView` to move `aMarker`. [`func rulerView(NSRulerView, shouldRemove: NSRulerMarker) -> Bool`](/documentation/AppKit/NSView/rulerView(_:shouldRemove:)) Requests permission for `aRulerView` to remove `aMarker`. [`func rulerView(NSRulerView, willAdd: NSRulerMarker, atLocation: CGFloat) -> CGFloat`](/documentation/AppKit/NSView/rulerView(_:willAdd:atLocation:)) Informs the client that `aRulerView` will add the new NSRulerMarker, `aMarker`. [`func rulerView(NSRulerView, willMove: NSRulerMarker, toLocation: CGFloat) -> CGFloat`](/documentation/AppKit/NSView/rulerView(_:willMove:toLocation:)) Informs the client that `aRulerView` will move `aMarker`, an NSRulerMarker already on the ruler view. [`func rulerView(NSRulerView, willSetClientView: NSView)`](/documentation/AppKit/NSView/rulerView(_:willSetClientView:)) Informs the client view that `aRulerView` is about to be appropriated by `newClient`. ### Synchronizing with the display’s refresh rate [`func displayLink(target: Any, selector: Selector) -> CADisplayLink`](/documentation/AppKit/NSView/displayLink(target:selector:)) Returns a new display link whose callback will be invoked in-sync with the display the view is on. --- 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)