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git-subtree-dir: submodules/AsyncDisplayKit git-subtree-mainline: d06f423e0ed3df1fed9bd10d79ee312a9179b632 git-subtree-split: 02bedc12816e251ad71777f9d2578329b6d2bef6
60 lines
1.8 KiB
Objective-C
60 lines
1.8 KiB
Objective-C
//
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// ASLayoutSpec+Subclasses.h
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// Texture
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//
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// Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
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// Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
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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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* 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) CGPoint position;
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@end
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NS_ASSUME_NONNULL_END
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