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73 lines
2.4 KiB
Objective-C
Executable File
73 lines
2.4 KiB
Objective-C
Executable File
//
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// ASTextKitShadower.h
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// AsyncDisplayKit
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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#import <UIKit/UIKit.h>
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#import <AsyncDisplayKit/ASBaseDefines.h>
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/**
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* @abstract an immutable class for calculating shadow padding drawing a shadowed background for text
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*/
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AS_SUBCLASSING_RESTRICTED
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@interface ASTextKitShadower : NSObject
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+ (ASTextKitShadower *)shadowerWithShadowOffset:(CGSize)shadowOffset
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shadowColor:(UIColor *)shadowColor
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shadowOpacity:(CGFloat)shadowOpacity
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shadowRadius:(CGFloat)shadowRadius;
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/**
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* @abstract The offset from the top-left corner at which the shadow starts.
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* @discussion A positive width will move the shadow to the right.
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* A positive height will move the shadow downwards.
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*/
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@property (nonatomic, readonly, assign) CGSize shadowOffset;
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//! CGColor in which the shadow is drawn
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@property (nonatomic, readonly, strong) UIColor *shadowColor;
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//! Alpha of the shadow
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@property (nonatomic, readonly, assign) CGFloat shadowOpacity;
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//! Radius, in pixels
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@property (nonatomic, readonly, assign) CGFloat shadowRadius;
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/**
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* @abstract The edge insets which represent shadow padding
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* @discussion Each edge inset is less than or equal to zero.
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*
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* Example:
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* CGRect boundsWithoutShadowPadding; // Large enough to fit text, not large enough to fit the shadow as well
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* UIEdgeInsets shadowPadding = [shadower shadowPadding];
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* CGRect boundsWithShadowPadding = UIEdgeInsetsRect(boundsWithoutShadowPadding, shadowPadding);
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*/
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- (UIEdgeInsets)shadowPadding;
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- (CGSize)insetSizeWithConstrainedSize:(CGSize)constrainedSize;
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- (CGRect)insetRectWithConstrainedRect:(CGRect)constrainedRect;
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- (CGSize)outsetSizeWithInsetSize:(CGSize)insetSize;
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- (CGRect)outsetRectWithInsetRect:(CGRect)insetRect;
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- (CGRect)offsetRectWithInternalRect:(CGRect)internalRect;
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- (CGPoint)offsetPointWithInternalPoint:(CGPoint)internalPoint;
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- (CGPoint)offsetPointWithExternalPoint:(CGPoint)externalPoint;
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/**
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* @abstract draws the shadow for text in the provided CGContext
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* @discussion Call within the text node's +drawRect method
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*/
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- (void)setShadowInContext:(CGContextRef)context;
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@end
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