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96 lines
4.3 KiB
Objective-C
96 lines
4.3 KiB
Objective-C
//
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// ASTextKitCoreTextAdditions.h
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// Texture
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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 /ASDK-Licenses directory of this source tree. An additional
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// grant of patent rights can be found in the PATENTS file in the same directory.
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//
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// Modifications to this file made after 4/13/2017 are: Copyright (c) 2017-present,
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// Pinterest, Inc. Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <Foundation/Foundation.h>
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#import <UIKit/UIKit.h>
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#import <AsyncDisplayKit/ASBaseDefines.h>
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NS_ASSUME_NONNULL_BEGIN
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ASDISPLAYNODE_EXTERN_C_BEGIN
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/**
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@abstract Returns whether a given attribute is an unsupported Core Text attribute.
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@param attributeName The name of the attribute
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@discussion The following Core Text attributes are not supported on NSAttributedString, and thus will not be preserved during the conversion:
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- kCTForegroundColorFromContextAttributeName
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- kCTSuperscriptAttributeName
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- kCTGlyphInfoAttributeName
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- kCTCharacterShapeAttributeName
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- kCTLanguageAttributeName
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- kCTRunDelegateAttributeName
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- kCTBaselineClassAttributeName
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- kCTBaselineInfoAttributeName
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- kCTBaselineReferenceInfoAttributeName
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- kCTWritingDirectionAttributeName
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- kCTUnderlineColorAttributeName
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@result Whether attributeName is an unsupported Core Text attribute.
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*/
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BOOL ASAttributeWithNameIsUnsupportedCoreTextAttribute(NSString *attributeName);
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/**
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@abstract Returns an attributes dictionary for use by NSAttributedString, given a dictionary of Core Text attributes.
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@param coreTextAttributes An NSDictionary whose keys are CFAttributedStringRef attributes.
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@discussion The following Core Text attributes are not supported on NSAttributedString, and thus will not be preserved during the conversion:
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- kCTForegroundColorFromContextAttributeName
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- kCTSuperscriptAttributeName
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- kCTGlyphInfoAttributeName
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- kCTCharacterShapeAttributeName
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- kCTLanguageAttributeName
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- kCTRunDelegateAttributeName
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- kCTBaselineClassAttributeName
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- kCTBaselineInfoAttributeName
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- kCTBaselineReferenceInfoAttributeName
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- kCTWritingDirectionAttributeName
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- kCTUnderlineColorAttributeName
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@result An NSDictionary of attributes for use by NSAttributedString.
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*/
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extern NSDictionary *NSAttributedStringAttributesForCoreTextAttributes(NSDictionary *coreTextAttributes);
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/**
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@abstract Returns an NSAttributedString whose Core Text attributes have been converted, where possible, to NSAttributedString attributes.
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@param dirtyAttributedString An NSAttributedString that may contain Core Text attributes.
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@result An NSAttributedString that's preserved as many CFAttributedString attributes as possible.
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*/
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extern NSAttributedString *ASCleanseAttributedStringOfCoreTextAttributes(NSAttributedString *dirtyAttributedString);
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ASDISPLAYNODE_EXTERN_C_END
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#pragma mark -
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#pragma mark -
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@interface NSParagraphStyle (ASTextKitCoreTextAdditions)
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/**
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@abstract Returns an NSParagraphStyle initialized with the paragraph specifiers from the given CTParagraphStyleRef.
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@param coreTextParagraphStyle A Core Text paragraph style.
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@discussion It is important to note that not all CTParagraphStyle specifiers are supported by NSParagraphStyle, and consequently, this is a lossy conversion. Notably, the following specifiers will not preserved:
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- kCTParagraphStyleSpecifierTabStops
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- kCTParagraphStyleSpecifierDefaultTabInterval
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- kCTParagraphStyleSpecifierMaximumLineSpacing
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- kCTParagraphStyleSpecifierMinimumLineSpacing
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- kCTParagraphStyleSpecifierLineSpacingAdjustment
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- kCTParagraphStyleSpecifierLineBoundsOptions
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@result An NSParagraphStyle initialized with as many of the paragraph specifiers from `coreTextParagraphStyle` as possible.
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*/
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+ (instancetype)paragraphStyleWithCTParagraphStyle:(CTParagraphStyleRef)coreTextParagraphStyle;
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@end
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NS_ASSUME_NONNULL_END
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