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59 lines
2.7 KiB
Objective-C
59 lines
2.7 KiB
Objective-C
/* Copyright (c) 2014-present, Facebook, Inc.
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* All rights reserved.
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*
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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 <Foundation/Foundation.h>
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/*
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* Use this class to compose new attributed strings. You may use the normal
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* attributed string calls on this the same way you would on a normal mutable
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* attributed string, but it coalesces your changes into transactions on the
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* actual string allowing improvements in performance.
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*
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* @discussion This is a use-once and throw away class for each string you make.
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* Since this class is designed for increasing performance, we actually hand
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* back the internally managed mutable attributed string in the
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* `composedAttributedString` call. So once you make that call, any more
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* changes will actually modify the string that was handed back to you in that
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* method.
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*
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* Combination of multiple calls into single attribution is managed through
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* merging of attribute dictionaries over ranges. For best performance, call
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* collections of attributions over a single range together. So for instance,
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* don't call addAttributes for range1, then range2, then range1 again. Group
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* them together so you call addAttributes for both range1 together, and then
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* range2.
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*
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* Also please note that switching between addAttribute and setAttributes in the
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* middle of composition is a bad idea for performance because they have
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* semantically different meanings, and trigger a commit of the pending
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* attributes.
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*
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* Please note that ALL of the standard NSString methods are left unimplemented.
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*/
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@interface ASMutableAttributedStringBuilder : NSMutableAttributedString
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- (instancetype)initWithString:(NSString *)str attributes:(NSDictionary *)attrs;
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- (instancetype)initWithAttributedString:(NSAttributedString *)attrStr;
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- (void)replaceCharactersInRange:(NSRange)range withString:(NSString *)str;
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- (void)setAttributes:(NSDictionary *)attrs range:(NSRange)range;
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- (void)addAttribute:(NSString *)name value:(id)value range:(NSRange)range;
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- (void)addAttributes:(NSDictionary *)attrs range:(NSRange)range;
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- (void)removeAttribute:(NSString *)name range:(NSRange)range;
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- (void)replaceCharactersInRange:(NSRange)range withAttributedString:(NSAttributedString *)attrString;
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- (void)insertAttributedString:(NSAttributedString *)attrString atIndex:(NSUInteger)loc;
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- (void)appendAttributedString:(NSAttributedString *)attrString;
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- (void)deleteCharactersInRange:(NSRange)range;
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- (void)setAttributedString:(NSAttributedString *)attrString;
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- (NSMutableAttributedString *)composedAttributedString;
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@end
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