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70 lines
2.5 KiB
Objective-C
70 lines
2.5 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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#import <UIKit/UIKit.h>
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#import <AsyncDisplayKit/ASAssert.h>
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#import <AsyncDisplayKit/ASLayoutable.h>
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extern CGPoint const CGPointNull;
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extern BOOL CGPointIsNull(CGPoint point);
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/** Represents a computed immutable layout tree. */
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@interface ASLayout : NSObject
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@property (nonatomic, readonly) id<ASLayoutable> layoutableObject;
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@property (nonatomic, readonly) CGSize size;
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/**
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* Position in parent. Default to CGPointNull.
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*
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* @discussion Before being used as a sublayout, this property must be set and no longer equal CGPointNull.
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*
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* @discussion Unlike all other properties, this property is read-write because often by initializaion time, it has yet been determined.
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* To enforce immutability, this property can be set once and only once.
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*
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*/
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@property (nonatomic, readwrite) CGPoint position;
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/**
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* Array of ASLayouts. Each must have a valid non-null position.
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*/
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@property (nonatomic, readonly) NSArray *sublayouts;
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+ (instancetype)newWithLayoutableObject:(id<ASLayoutable>)layoutableObject
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size:(CGSize)size
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position:(CGPoint)position
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sublayouts:(NSArray *)sublayouts;
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/**
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* Convenience that has CGPointNull position.
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*/
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+ (instancetype)newWithLayoutableObject:(id<ASLayoutable>)layoutableObject
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size:(CGSize)size
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sublayouts:(NSArray *)sublayouts;
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/**
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* Convenience that has CGPointNull position and no sublayouts.
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*/
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+ (instancetype)newWithLayoutableObject:(id<ASLayoutable>)layoutableObject size:(CGSize)size;
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/**
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* @abstract Evaluates a given predicate block against each object in the receiving layout tree
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* and returns a new, 1-level deep layout containing the objects for which the predicate block returns true.
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*
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* @param predicateBlock The block is applied to a layout to be evaluated.
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* The block takes 1 argument: evaluatedLayout - the layout to be evaluated.
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* The block returns YES if evaluatedLayout evaluates to true, otherwise NO.
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*
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* @return A new, 1-level deep layout containing the layouts for which the predicate block returns true.
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*/
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- (ASLayout *)flattenedLayoutUsingPredicateBlock:(BOOL (^)(ASLayout *evaluatedLayout))predicateBlock;
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@end
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