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75 lines
2.7 KiB
Plaintext
Executable File
75 lines
2.7 KiB
Plaintext
Executable File
/*
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* 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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*/
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#import <mutex>
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#import "ASTextKitContext.h"
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#import "ASLayoutManager.h"
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@implementation ASTextKitContext
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{
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// All TextKit operations (even non-mutative ones) must be executed serially.
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std::mutex _textKitMutex;
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NSLayoutManager *_layoutManager;
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NSTextStorage *_textStorage;
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NSTextContainer *_textContainer;
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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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layoutManagerFactory:(NSLayoutManager*(*)(void))layoutManagerFactory
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layoutManagerDelegate:(id<NSLayoutManagerDelegate>)layoutManagerDelegate
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{
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if (self = [super init]) {
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// Concurrently initialising TextKit components crashes (rdar://18448377) so we use a global lock.
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static std::mutex __static_mutex;
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std::lock_guard<std::mutex> l(__static_mutex);
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// Create the TextKit component stack with our default configuration.
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_textStorage = (attributedString ? [[NSTextStorage alloc] initWithAttributedString:attributedString] : [[NSTextStorage alloc] init]);
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_layoutManager = layoutManagerFactory ? layoutManagerFactory() : [[ASLayoutManager alloc] init];
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_layoutManager.usesFontLeading = NO;
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_layoutManager.delegate = layoutManagerDelegate;
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[_textStorage addLayoutManager:_layoutManager];
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_textContainer = [[NSTextContainer alloc] initWithSize:constrainedSize];
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// We want the text laid out up to the very edges of the container.
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_textContainer.lineFragmentPadding = 0;
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_textContainer.lineBreakMode = lineBreakMode;
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_textContainer.maximumNumberOfLines = maximumNumberOfLines;
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_textContainer.exclusionPaths = exclusionPaths;
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[_layoutManager addTextContainer:_textContainer];
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}
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return self;
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}
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- (CGSize)constrainedSize
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{
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return _textContainer.size;
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}
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- (void)setConstrainedSize:(CGSize)constrainedSize
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{
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_textContainer.size = constrainedSize;
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}
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- (void)performBlockWithLockedTextKitComponents:(void (^)(NSLayoutManager *,
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NSTextStorage *,
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NSTextContainer *))block
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{
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std::lock_guard<std::mutex> l(_textKitMutex);
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block(_layoutManager, _textStorage, _textContainer);
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}
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@end
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