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678c201dbc
These conditions already had assertions, but at runtime, an insufficiently tested and incorrect ASLayoutSpec could generate values that cause UIKit to enter an infinite loop (e.g. inside of UICollectionView layout validation).
82 lines
2.7 KiB
Objective-C
82 lines
2.7 KiB
Objective-C
/*
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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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#pragma once
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#import <UIKit/UIKit.h>
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#import <AsyncDisplayKit/ASBaseDefines.h>
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/**
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A dimension relative to constraints to be provided in the future.
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*/
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typedef NS_ENUM(NSInteger, ASRelativeDimensionType) {
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/** Just a number. It will always resolve to exactly this amount. This is the default type. */
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ASRelativeDimensionTypePoints,
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/** Multiplied to a provided parent amount to resolve a final amount. */
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ASRelativeDimensionTypePercent,
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};
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typedef struct {
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ASRelativeDimensionType type;
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CGFloat value;
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} ASRelativeDimension;
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/** Expresses an inclusive range of sizes. Used to provide a simple constraint to layout. */
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typedef struct {
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CGSize min;
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CGSize max;
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} ASSizeRange;
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extern ASRelativeDimension const ASRelativeDimensionUnconstrained;
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#define isValidForLayout(x) ((isnormal(x) || x == 0.0) && x >= 0.0 && x < (CGFLOAT_MAX / 2.0))
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ASDISPLAYNODE_EXTERN_C_BEGIN
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NS_ASSUME_NONNULL_BEGIN
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#pragma mark ASRelativeDimension
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extern ASRelativeDimension ASRelativeDimensionMake(ASRelativeDimensionType type, CGFloat value);
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extern ASRelativeDimension ASRelativeDimensionMakeWithPoints(CGFloat points);
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extern ASRelativeDimension ASRelativeDimensionMakeWithPercent(CGFloat percent);
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extern ASRelativeDimension ASRelativeDimensionCopy(ASRelativeDimension aDimension);
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extern BOOL ASRelativeDimensionEqualToRelativeDimension(ASRelativeDimension lhs, ASRelativeDimension rhs);
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extern NSString *NSStringFromASRelativeDimension(ASRelativeDimension dimension);
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extern CGFloat ASRelativeDimensionResolve(ASRelativeDimension dimension, CGFloat parent);
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#pragma mark -
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#pragma mark ASSizeRange
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extern ASSizeRange ASSizeRangeMake(CGSize min, CGSize max);
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/** Creates an ASSizeRange with the provided size as both min and max */
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extern ASSizeRange ASSizeRangeMakeExactSize(CGSize size);
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/** Clamps the provided CGSize between the [min, max] bounds of this ASSizeRange. */
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extern CGSize ASSizeRangeClamp(ASSizeRange sizeRange, CGSize size);
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/**
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Intersects another size range. If the other size range does not overlap in either dimension, this size range
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"wins" by returning a single point within its own range that is closest to the non-overlapping range.
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*/
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extern ASSizeRange ASSizeRangeIntersect(ASSizeRange sizeRange, ASSizeRange otherSizeRange);
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extern BOOL ASSizeRangeEqualToSizeRange(ASSizeRange lhs, ASSizeRange rhs);
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extern NSString *NSStringFromASSizeRange(ASSizeRange sizeRange);
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NS_ASSUME_NONNULL_END
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ASDISPLAYNODE_EXTERN_C_END
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