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6238e5edbd
* Before truncate a text storage in ASTextKitContext reset the text storage to original value * Fix ASTextNode tests We should pass in the constrained size in both cases and the sizes should be the same. We adjust the calculated size in ASTextNode to be a bit narrower in the second case if we truncate again with the calculated size as constrained size it will truncate more and the resulting size will shrink.
62 lines
2.7 KiB
Objective-C
Executable File
62 lines
2.7 KiB
Objective-C
Executable File
//
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// ASTextKitContext.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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typedef NSTextStorage *(^ASTextKitContextTextStorageCreationBlock)(NSAttributedString *attributedString);
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/**
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A threadsafe container for the TextKit components that ASTextKit uses to lay out and truncate its text.
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This container is the sole owner and manager of the TextKit classes. This is an important model because of major
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thread safety issues inside vanilla TextKit. It provides a central locking location for accessing TextKit methods.
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*/
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@interface ASTextKitContext : NSObject
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/**
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Initializes a context and its associated TextKit components.
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Initialization of TextKit components is a globally locking operation so be careful of bottlenecks with this class.
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*/
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- (instancetype)initWithAttributedString:(NSAttributedString *)attributedString
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lineBreakMode:(NSLineBreakMode)lineBreakMode
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maximumNumberOfLines:(NSUInteger)maximumNumberOfLines
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exclusionPaths:(NSArray *)exclusionPaths
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constrainedSize:(CGSize)constrainedSize
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layoutManagerCreationBlock:(NSLayoutManager * (^)(void))layoutCreationBlock
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layoutManagerDelegate:(id<NSLayoutManagerDelegate>)layoutManagerDelegate
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textStorageCreationBlock:(ASTextKitContextTextStorageCreationBlock)textStorageCreationBlock;
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/**
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Set the constrained size for the text context.
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*/
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@property (nonatomic, assign, readwrite) CGSize constrainedSize;
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/**
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Resets the text storage to the original value in case it was truncated before. This method is called within
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a locked context.
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*/
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- (void)resetTextStorage;
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/**
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All operations on TextKit values MUST occur within this locked context. Simultaneous access (even non-mutative) to
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TextKit components may cause crashes.
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The block provided MUST not call out to client code from within its scope or it is possible for this to cause deadlocks
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in your application. Use with EXTREME care.
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Callers MUST NOT keep a ref to these internal objects and use them later. This WILL cause crashes in your application.
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*/
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- (void)performBlockWithLockedTextKitComponents:(void (^)(NSLayoutManager *layoutManager,
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NSTextStorage *textStorage,
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NSTextContainer *textContainer))block;
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@end
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