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67 lines
3.1 KiB
Objective-C
67 lines
3.1 KiB
Objective-C
/* 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 <UIKit/UIKit.h>
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#import <AsyncDisplayKit/ASBaseDefines.h>
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NS_ASSUME_NONNULL_BEGIN
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ASDISPLAYNODE_INLINE CGFloat ceilPixelValueForScale(CGFloat f, CGFloat scale)
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{
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// Round up to device pixel (.5 on retina)
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return ceilf(f * scale) / scale;
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}
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ASDISPLAYNODE_INLINE CGSize ceilSizeValue(CGSize s)
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{
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CGFloat screenScale = [UIScreen mainScreen].scale;
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s.width = ceilPixelValueForScale(s.width, screenScale);
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s.height = ceilPixelValueForScale(s.height, screenScale);
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return s;
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}
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@interface ASTextKitComponents : NSObject
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/**
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@abstract Creates the stack of TextKit components.
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@param attributedSeedString The attributed string to seed the returned text storage with, or nil to receive an blank text storage.
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@param textContainerSize The size of the text-container. Typically, size specifies the constraining width of the layout, and FLT_MAX for height. Pass CGSizeZero if these components will be hooked up to a UITextView, which will manage the text container's size itself.
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@return An `ASTextKitComponents` containing the created components. The text view component will be nil.
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@discussion The returned components will be hooked up together, so they are ready for use as a system upon return.
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*/
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+ (instancetype)componentsWithAttributedSeedString:(nullable NSAttributedString *)attributedSeedString
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textContainerSize:(CGSize)textContainerSize;
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/**
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@abstract Creates the stack of TextKit components.
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@param textStorage The NSTextStorage to use.
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@param textContainerSize The size of the text-container. Typically, size specifies the constraining width of the layout, and FLT_MAX for height. Pass CGSizeZero if these components will be hooked up to a UITextView, which will manage the text container's size itself.
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@param layoutManager The NSLayoutManager to use.
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@return An `ASTextKitComponents` containing the created components. The text view component will be nil.
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@discussion The returned components will be hooked up together, so they are ready for use as a system upon return.
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*/
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+ (instancetype)componentsWithTextStorage:(NSTextStorage *)textStorage
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textContainerSize:(CGSize)textContainerSize
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layoutManager:(NSLayoutManager *)layoutManager;
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/**
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@abstract Returns the bounding size for the text view's text.
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@param constrainedWidth The constraining width to be used during text-sizing. Usually, this value should be the receiver's calculated size.
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@result A CGSize representing the bounding size for the receiver's text.
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*/
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- (CGSize)sizeForConstrainedWidth:(CGFloat)constrainedWidth;
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@property (nonatomic, strong, readonly) NSTextStorage *textStorage;
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@property (nonatomic, strong, readonly) NSTextContainer *textContainer;
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@property (nonatomic, strong, readonly) NSLayoutManager *layoutManager;
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@property (nullable, nonatomic, strong) UITextView *textView;
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@end
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NS_ASSUME_NONNULL_END
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