This is a subclass of NSView and is used to draw rulers in an NSScrollView. A ruler view keeps track of the units used to convert measurements between pixels and whatever unit the client specifies should be displayed by the ruler view. A ruler view may contain ruler markers, which are instances of the class NSRulerMarker.

@interface NSRulerView : NSView
// Initializers
- (id)initWithScrollView:(NSScrollView *)scrollView orientation:(NSRulerOrientation)orientation;
// Accessor Methods
- (void)setReservedThicknessForAccessoryView:(float)thickness;
- (float)reservedThicknessForAccessoryView;
- (void)setScrollView:(NSScrollView *)scrollView;
- (NSScrollView *)scrollView;
- (void)setOriginOffset:(float)offset;
- (float)originOffset;
- (void)setOrientation:(NSRulerOrientation)orientation;
- (NSRulerOrientation)orientation;
- (void)setClientView:(NSView *)client;
- (NSView *)clientView;
- (void)setReservedThicknessForMarkers:(float)thickness;
- (float)reservedThicknessForMarkers;
- (void)setMarkers:(NSArray *)markers;
- (NSArray *)markers;
- (void)setRuleThickness:(float)thickness;
- (float)ruleThickness;
- (void)setAccessoryView:(NSView *)accessory;
- (NSView *)accessoryView;
- (void)setMeasurementUnits:(NSString *)unitName;
- (NSString *)measurementUnits;
// Class Methods
+ (void)registerUnitWithName:(NSString *)unitName abbreviation:(NSString *)abbreviation unitToPointsConversionFactor:(float)conversionFactor tepUpCycle:(NSArray *)stepUpCycle stepDownCycle:(NSArray *)stepDownCycle;
// Instance Methods
- (void)addMarker:(NSRulerMarker *)marker;
- (float)baselineLocation;
- (void)drawHashMarksAndLabelsInRect:(NSRect)rect;
- (void)drawMarkersInRect:(NSRect)rect;
- (void)invalidateHashMarks;
- (BOOL)isFlipped;
- (void)moveRulerlineFromLocation:(float)oldLocation toLocation:(float)newLocation;
- (void)removeMarker:(NSRulerMarker *)marker;
- (float)requiredThickness;
- (BOOL)trackMarker:(NSRulerMarker *)marker withMouseEvent:(NSEvent *)event;