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49 lines
1.9 KiB
Objective-C
49 lines
1.9 KiB
Objective-C
//
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// ASTextKitFontSizeAdjuster.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 <Foundation/Foundation.h>
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#import "ASTextKitAttributes.h"
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#import "ASTextKitContext.h"
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@interface ASTextKitFontSizeAdjuster : NSObject
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@property (nonatomic, assign) CGSize constrainedSize;
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/**
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* Creates a class that will return a scale factor the will make a string fit inside the constrained size.
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*
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* "Fitting" means that both the longest word in the string will fit without breaking in the constrained
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* size's width AND that the entire string will try to fit within attribute's maximumLineCount. The amount
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* that the string will scale is based upon the attribute's pointSizeScaleFactors. If the string cannot fit
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* in the given width/number of lines, the smallest scale factor will be returned.
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*
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* @param context The text kit context
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* @param constrainedSize The constrained size to render into
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* @param textComponentAttributes The renderer's text attributes
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*/
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- (instancetype)initWithContext:(ASTextKitContext *)context
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constrainedSize:(CGSize)constrainedSize
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textKitAttributes:(const ASTextKitAttributes &)textComponentAttributes;
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/**
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* Returns the best fit scale factor for the text
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*/
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- (CGFloat)scaleFactor;
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/**
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* Takes all of the attributed string attributes dealing with size (font size, line spacing, kerning, etc) and
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* scales them by the scaleFactor. I wouldn't be surprised if I missed some in here.
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*/
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+ (void)adjustFontSizeForAttributeString:(NSMutableAttributedString *)attrString withScaleFactor:(CGFloat)scaleFactor;
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@end
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