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CPTAnnotation.m
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199 lines (160 loc) · 5.09 KB
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#import "CPTAnnotation.h"
#import "CPTAnnotationHostLayer.h"
#import "NSCoderExtensions.h"
/** @brief An annotation positions a content layer relative to some anchor point.
*
* Annotations can be used to add text or images that are anchored to a feature
* of a graph. For example, the graph title is an annotation anchored to the graph.
* The annotation content layer can be any CPTLayer.
**/
@implementation CPTAnnotation
/** @property nullable CPTLayer *contentLayer
* @brief The annotation content.
**/
@synthesize contentLayer;
/** @property nullable CPTAnnotationHostLayer *annotationHostLayer
* @brief The host layer for the annotation content.
**/
@synthesize annotationHostLayer;
/** @property CGPoint displacement
* @brief The displacement from the layer anchor point.
**/
@synthesize displacement;
/** @property CGPoint contentAnchorPoint
* @brief The anchor point for the content layer.
**/
@synthesize contentAnchorPoint;
/** @property CGFloat rotation
* @brief The rotation of the label in radians.
**/
@synthesize rotation;
#pragma mark -
#pragma mark Init/Dealloc
/// @name Initialization
/// @{
/** @brief Initializes a newly allocated CPTAnnotation object.
*
* The initialized object will have the following properties:
* - @ref annotationHostLayer = @nil
* - @ref contentLayer = @nil
* - @ref displacement = (@num{0.0}, @num{0.0})
* - @ref contentAnchorPoint = (@num{0.5}, @num{0.5})
* - @ref rotation = @num{0.0}
*
* @return The initialized object.
**/
-(nonnull instancetype)init
{
if ((self = [super init])) {
annotationHostLayer = nil;
contentLayer = nil;
displacement = CGPointZero;
contentAnchorPoint = CPTPointMake(0.5, 0.5);
rotation = CPTFloat(0.0);
}
return self;
}
/// @}
#pragma mark -
#pragma mark NSCoding Methods
/// @cond
-(void)encodeWithCoder:(nonnull NSCoder *)coder
{
[coder encodeConditionalObject:self.annotationHostLayer forKey:@"CPTAnnotation.annotationHostLayer"];
[coder encodeObject:self.contentLayer forKey:@"CPTAnnotation.contentLayer"];
[coder encodeCPTPoint:self.contentAnchorPoint forKey:@"CPTAnnotation.contentAnchorPoint"];
[coder encodeCPTPoint:self.displacement forKey:@"CPTAnnotation.displacement"];
[coder encodeCGFloat:self.rotation forKey:@"CPTAnnotation.rotation"];
}
-(nullable instancetype)initWithCoder:(nonnull NSCoder *)coder
{
if ((self = [super init])) {
annotationHostLayer = [coder decodeObjectOfClass:[CPTAnnotationHostLayer class]
forKey:@"CPTAnnotation.annotationHostLayer"];
contentLayer = [coder decodeObjectOfClass:[CPTLayer class]
forKey:@"CPTAnnotation.contentLayer"];
contentAnchorPoint = [coder decodeCPTPointForKey:@"CPTAnnotation.contentAnchorPoint"];
displacement = [coder decodeCPTPointForKey:@"CPTAnnotation.displacement"];
rotation = [coder decodeCGFloatForKey:@"CPTAnnotation.rotation"];
}
return self;
}
/// @endcond
#pragma mark -
#pragma mark NSSecureCoding Methods
/// @cond
+(BOOL)supportsSecureCoding
{
return YES;
}
/// @endcond
#pragma mark -
#pragma mark Description
/// @cond
-(nullable NSString *)description
{
return [NSString stringWithFormat:@"<%@ {%@}>", super.description, self.contentLayer];
}
/// @endcond
#pragma mark -
#pragma mark Accessors
/// @cond
-(void)setContentLayer:(nullable CPTLayer *)newLayer
{
if ( newLayer != contentLayer ) {
[contentLayer removeFromSuperlayer];
contentLayer = newLayer;
if ( newLayer ) {
CPTLayer *layer = newLayer;
CPTAnnotationHostLayer *hostLayer = self.annotationHostLayer;
[hostLayer addSublayer:layer];
}
}
}
-(void)setAnnotationHostLayer:(nullable CPTAnnotationHostLayer *)newLayer
{
if ( newLayer != annotationHostLayer ) {
CPTLayer *myContent = self.contentLayer;
[myContent removeFromSuperlayer];
annotationHostLayer = newLayer;
if ( myContent ) {
[newLayer addSublayer:myContent];
}
}
}
-(void)setDisplacement:(CGPoint)newDisplacement
{
if ( !CGPointEqualToPoint(newDisplacement, displacement)) {
displacement = newDisplacement;
[self.contentLayer.superlayer setNeedsLayout];
}
}
-(void)setContentAnchorPoint:(CGPoint)newAnchorPoint
{
if ( !CGPointEqualToPoint(newAnchorPoint, contentAnchorPoint)) {
contentAnchorPoint = newAnchorPoint;
[self.contentLayer.superlayer setNeedsLayout];
}
}
-(void)setRotation:(CGFloat)newRotation
{
if ( newRotation != rotation ) {
rotation = newRotation;
[self.contentLayer.superlayer setNeedsLayout];
}
}
/// @endcond
@end
#pragma mark -
#pragma mark Layout
@implementation CPTAnnotation(AbstractMethods)
/** @brief Positions the content layer relative to its reference anchor.
*
* This method must be overridden by subclasses. The default implementation
* does nothing.
**/
-(void)positionContentLayer
{
// Do nothing--implementation provided by subclasses
}
@end