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85 lines
2.8 KiB
Plaintext
85 lines
2.8 KiB
Plaintext
//
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// ASTextKitContext.mm
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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 "ASTextKitContext.h"
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#if AS_ENABLE_TEXTNODE
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#import "ASLayoutManager.h"
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#import <AsyncDisplayKit/ASThread.h>
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#include <memory>
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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::shared_ptr<AS::Mutex> __instanceLock__;
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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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{
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if (self = [super init]) {
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static dispatch_once_t onceToken;
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static AS::Mutex *mutex;
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dispatch_once(&onceToken, ^{
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mutex = new AS::Mutex();
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});
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// Concurrently initialising TextKit components crashes (rdar://18448377) so we use a global lock.
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AS::MutexLocker l(*mutex);
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__instanceLock__ = std::make_shared<AS::Mutex>();
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// Create the TextKit component stack with our default configuration.
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_textStorage = [[NSTextStorage alloc] init];
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_layoutManager = [[ASLayoutManager alloc] init];
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_layoutManager.usesFontLeading = NO;
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[_textStorage addLayoutManager:_layoutManager];
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// Instead of calling [NSTextStorage initWithAttributedString:], setting attributedString just after calling addlayoutManager can fix CJK language layout issues.
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// See https://github.com/facebook/AsyncDisplayKit/issues/2894
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if (attributedString) {
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[_textStorage setAttributedString:attributedString];
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}
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_textContainer = [[ASCustomTextContainer alloc] initWithSize:constrainedSize textStorage:nil];
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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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- (void)performBlockWithLockedTextKitComponents:(NS_NOESCAPE void (^)(NSLayoutManager *,
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NSTextStorage *,
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NSTextContainer *))block
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{
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AS::MutexLocker l(*__instanceLock__);
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if (block) {
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block(_layoutManager, _textStorage, _textContainer);
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}
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}
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@end
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#endif
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