AsyncDisplayKit/AsyncDisplayKit/TextKit/ASTextKitShadower.h at master · rurza/AsyncDisplayKit · GitHub

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// ASTextKitShadower.h

// AsyncDisplayKit

// This source code is licensed under the BSD-style license found in the

// LICENSE file in the root directory of this source tree. An additional grant

// of patent rights can be found in the PATENTS file in the same directory.

#import <UIKit/UIKit.h>

/**

* @abstract an immutable class for calculating shadow padding drawing a shadowed background for text

@interface ASTextKitShadower : NSObject

+ (ASTextKitShadower *)shadowerWithShadowOffset:(CGSize)shadowOffset

shadowColor:(UIColor *)shadowColor

shadowOpacity:(CGFloat)shadowOpacity

shadowRadius:(CGFloat)shadowRadius;

/**

* @abstract The offset from the top-left corner at which the shadow starts.

* @discussion A positive width will move the shadow to the right.

* A positive height will move the shadow downwards.

@property (nonatomic, readonly, assign) CGSize shadowOffset;

//! CGColor in which the shadow is drawn

@property (nonatomic, readonly, strong) UIColor *shadowColor;

//! Alpha of the shadow

@property (nonatomic, readonly, assign) CGFloat shadowOpacity;

//! Radius, in pixels

@property (nonatomic, readonly, assign) CGFloat shadowRadius;

/**

* @abstract The edge insets which represent shadow padding

* @discussion Each edge inset is less than or equal to zero.

* Example:

* CGRect boundsWithoutShadowPadding; // Large enough to fit text, not large enough to fit the shadow as well

* UIEdgeInsets shadowPadding = [shadower shadowPadding];

* CGRect boundsWithShadowPadding = UIEdgeInsetsRect(boundsWithoutShadowPadding, shadowPadding);

- (UIEdgeInsets)shadowPadding;

- (CGSize)insetSizeWithConstrainedSize:(CGSize)constrainedSize;

- (CGRect)insetRectWithConstrainedRect:(CGRect)constrainedRect;

- (CGSize)outsetSizeWithInsetSize:(CGSize)insetSize;

- (CGRect)outsetRectWithInsetRect:(CGRect)insetRect;

- (CGRect)offsetRectWithInternalRect:(CGRect)internalRect;

- (CGPoint)offsetPointWithInternalPoint:(CGPoint)internalPoint;

- (CGPoint)offsetPointWithExternalPoint:(CGPoint)externalPoint;

/**

* @abstract draws the shadow for text in the provided CGContext

* @discussion Call within the text node's +drawRect method

- (void)setShadowInContext:(CGContextRef)context;

@end

AsyncDisplayKit/AsyncDisplayKit/TextKit/ASTextKitShadower.h at master · rurza/AsyncDisplayKit · GitHub

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