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58 lines
2.4 KiB
Plaintext
58 lines
2.4 KiB
Plaintext
/* 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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#import "ASTextNodeTextKitHelpers.h"
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@interface ASTextKitComponents ()
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// read-write redeclarations
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@property (nonatomic, strong, readwrite) NSTextStorage *textStorage;
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@property (nonatomic, strong, readwrite) NSTextContainer *textContainer;
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@property (nonatomic, strong, readwrite) NSLayoutManager *layoutManager;
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@end
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@implementation ASTextKitComponents
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+ (ASTextKitComponents *)componentsWithAttributedSeedString:(NSAttributedString *)attributedSeedString
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textContainerSize:(CGSize)textContainerSize
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{
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ASTextKitComponents *components = [[ASTextKitComponents alloc] init];
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// Create the TextKit component stack with our default configuration.
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components.textStorage = (attributedSeedString ? [[NSTextStorage alloc] initWithAttributedString:attributedSeedString] : [[NSTextStorage alloc] init]);
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components.layoutManager = [[NSLayoutManager alloc] init];
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[components.textStorage addLayoutManager:components.layoutManager];
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components.textContainer = [[NSTextContainer alloc] initWithSize:textContainerSize];
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components.textContainer.lineFragmentPadding = 0.0; // We want the text laid out up to the very edges of the text-view.
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[components.layoutManager addTextContainer:components.textContainer];
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return components;
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}
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- (CGSize)sizeForConstrainedWidth:(CGFloat)constrainedWidth
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{
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ASTextKitComponents *components = self;
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// If our text-view's width is already the constrained width, we can use our existing TextKit stack for this sizing calculation.
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// Otherwise, we create a temporary stack to size for `constrainedWidth`.
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if (CGRectGetWidth(components.textView.bounds) != constrainedWidth) {
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components = [ASTextKitComponents componentsWithAttributedSeedString:components.textStorage textContainerSize:CGSizeMake(constrainedWidth, FLT_MAX)];
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}
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// Force glyph generation and layout, which may not have happened yet (and isn't triggered by -usedRectForTextContainer:).
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[components.layoutManager ensureLayoutForTextContainer:components.textContainer];
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CGSize textSize = [components.layoutManager usedRectForTextContainer:components.textContainer].size;
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return textSize;
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}
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@end
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