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48 lines
2.1 KiB
Objective-C
Executable File
48 lines
2.1 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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#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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