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2f99951732
* Initial commit to move [ASLayoutSpec children] from std::map to NSMutableArray * Add NSFastEnumeration to ASLayoutable * ASNullLayoutSpec is a Singleton now * Move ASLayoutSpecPrivate in Private folder * Move to NSArrayPointer and remove ASNullLayoutSpec * Revert "Move to NSArrayPointer and remove ASNullLayoutSpec" This reverts commit 9ab9cf7024b1f6e1984d84fe58af2b84e84cdf94. * Move to childAtIndex: and setChild:atIndex:
97 lines
3.5 KiB
Objective-C
97 lines
3.5 KiB
Objective-C
//
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// ASLayoutSpec.h
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// AsyncDisplayKit
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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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 <AsyncDisplayKit/ASLayoutable.h>
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#import <AsyncDisplayKit/ASAsciiArtBoxCreator.h>
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NS_ASSUME_NONNULL_BEGIN
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/**
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* A layout spec is an immutable object that describes a layout, loosely inspired by React.
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*/
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@interface ASLayoutSpec : NSObject <ASLayoutable>
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/**
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* Creation of a layout spec should only happen by a user in layoutSpecThatFits:. During that method, a
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* layout spec can be created and mutated. Once it is passed back to ASDK, the isMutable flag will be
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* set to NO and any further mutations will cause an assert.
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*/
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@property (nonatomic, assign) BOOL isMutable;
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/**
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* Parent of the layout spec
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*/
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@property (nullable, nonatomic, weak) id<ASLayoutable> parent;
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/**
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* Adds a child to this layout spec using a default identifier.
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*
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* @param child A child to be added.
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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 should use this method to set the "primary" child. It can then use setChild:forIdentifier:
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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:forIdentifier: internally. For example, ASBackgroundLayoutSpec exposes a backgroundChild
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* property that behind the scenes is calling setChild:forIdentifier:.
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*/
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@property (nullable, strong, nonatomic) id<ASLayoutable> child;
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/**
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* Adds childen to this layout spec.
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*
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* @param children An array of ASLayoutable children to be added.
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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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* reponsibility of holding on to the spec children. Some layout specs, like ASStackLayoutSpec,
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* can take an unknown number of children. In this case, the this method should be used.
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* For good measure, in these layout specs it probably makes sense to define
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* setChild: and setChild:forIdentifier: methods to do something appropriate or to assert.
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*/
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@property (nullable, strong, nonatomic) NSArray<id<ASLayoutable>> *children;
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@end
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/**
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* An ASLayoutSpec subclass that can wrap a ASLayoutable and calculates the layout of the child.
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*/
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@interface ASWrapperLayoutSpec : ASLayoutSpec
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/*
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* Returns an ASWrapperLayoutSpec object with the given layoutable as child
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*/
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+ (instancetype)wrapperWithLayoutable:(id<ASLayoutable>)layoutable;
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/*
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* Returns an ASWrapperLayoutSpec object initialized with the given layoutable as child
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*/
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- (instancetype)initWithLayoutable:(id<ASLayoutable>)layoutable NS_DESIGNATED_INITIALIZER;;
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/*
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* Init not available for ASWrapperLayoutSpec
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*/
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- (instancetype)init __unavailable;
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@end
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@interface ASLayoutSpec (Debugging) <ASLayoutableAsciiArtProtocol>
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/**
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* Used by other layout specs to create ascii art debug strings
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*/
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+ (NSString *)asciiArtStringForChildren:(NSArray *)children parentName:(NSString *)parentName direction:(ASStackLayoutDirection)direction;
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+ (NSString *)asciiArtStringForChildren:(NSArray *)children parentName:(NSString *)parentName;
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@end
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NS_ASSUME_NONNULL_END
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