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git-subtree-dir: submodules/AsyncDisplayKit git-subtree-mainline: d06f423e0ed3df1fed9bd10d79ee312a9179b632 git-subtree-split: 02bedc12816e251ad71777f9d2578329b6d2bef6
54 lines
2.1 KiB
Objective-C
54 lines
2.1 KiB
Objective-C
//
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// ASTextKitContext.h
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// Texture
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//
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// Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
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// Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <UIKit/UIKit.h>
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#import <AsyncDisplayKit/ASAvailability.h>
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#if AS_ENABLE_TEXTNODE
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#import <AsyncDisplayKit/ASBaseDefines.h>
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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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AS_SUBCLASSING_RESTRICTED
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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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/**
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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:(AS_NOESCAPE 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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#endif
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