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80 lines
2.4 KiB
Objective-C
80 lines
2.4 KiB
Objective-C
//
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// ASLayoutSpec+Subclasses.h
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// AsyncDisplayKit
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//
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// Created by Michael Schneider on 9/15/16.
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// Copyright © 2016 Facebook. All rights reserved.
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//
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#import <Foundation/Foundation.h>
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#import <AsyncDisplayKit/ASLayoutSpec.h>
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#import <AsyncDisplayKit/ASLayout.h>
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NS_ASSUME_NONNULL_BEGIN
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@protocol ASLayoutElement;
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@interface ASLayoutSpec (Subclassing)
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/**
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* Helper method for finalLayoutElement support
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*
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* @warning If you are getting recursion crashes here after implementing finalLayoutElement, make sure
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* that you are setting isFinalLayoutElement flag to YES. This must be one BEFORE adding a child
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* to the new ASLayoutElement.
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*
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* For example:
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* - (id<ASLayoutElement>)finalLayoutElement
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* {
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* ASInsetLayoutSpec *insetSpec = [[ASInsetLayoutSpec alloc] init];
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* insetSpec.insets = UIEdgeInsetsMake(10,10,10,10);
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* insetSpec.isFinalLayoutElement = YES;
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* [insetSpec setChild:self];
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* return insetSpec;
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* }
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*
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* @see finalLayoutElement
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*/
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- (id<ASLayoutElement>)layoutElementToAddFromLayoutElement:(id<ASLayoutElement>)child;
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/**
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* Adds a child with the given identifier to this layout spec.
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*
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* @param child A child to be added.
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*
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* @param index An index associated with the child.
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*
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* @discussion Every ASLayoutSpec must act on at least one child. The ASLayoutSpec base class takes the
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* responsibility of holding on to the spec children. Some layout specs, like ASInsetLayoutSpec,
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* only require a single child.
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*
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* For layout specs that require a known number of children (ASBackgroundLayoutSpec, for example)
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* a subclass can use the setChild method to set the "primary" child. It should then use this method
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* to set any other required children. Ideally a subclass would hide this from the user, and use the
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* setChild:forIndex: internally. For example, ASBackgroundLayoutSpec exposes a backgroundChild
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* property that behind the scenes is calling setChild:forIndex:.
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*/
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- (void)setChild:(id<ASLayoutElement>)child atIndex:(NSUInteger)index;
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/**
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* Returns the child added to this layout spec using the given index.
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*
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* @param index An identifier associated with the the child.
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*/
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- (nullable id<ASLayoutElement>)childAtIndex:(NSUInteger)index;
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@end
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@interface ASLayout ()
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/**
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* Position in parent. Default to CGPointNull.
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*
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* @discussion When being used as a sublayout, this property must not equal CGPointNull.
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*/
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@property (nonatomic, assign, readwrite) CGPoint position;
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@end
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NS_ASSUME_NONNULL_END
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