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69 lines
2.3 KiB
Objective-C
69 lines
2.3 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 <Foundation/Foundation.h>
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@class ASLayoutSpec;
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@class ASLayoutOptions;
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@protocol ASLayoutable;
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struct ASLayoutableContext {
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int32_t transitionID;
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BOOL needsVisualizeNode;
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};
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extern int32_t const ASLayoutableContextInvalidTransitionID;
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extern int32_t const ASLayoutableContextDefaultTransitionID;
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extern struct ASLayoutableContext const ASLayoutableContextNull;
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extern BOOL ASLayoutableContextIsNull(struct ASLayoutableContext context);
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extern struct ASLayoutableContext ASLayoutableContextMake(int32_t transitionID, BOOL needsVisualizeNode);
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extern void ASLayoutableSetCurrentContext(struct ASLayoutableContext context);
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extern struct ASLayoutableContext ASLayoutableGetCurrentContext();
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extern void ASLayoutableClearCurrentContext();
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/**
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* The base protocol for ASLayoutable. Generally the methods/properties in this class do not need to be
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* called by the end user and are only called internally. However, there may be a case where the methods are useful.
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*/
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@protocol ASLayoutablePrivate <NSObject>
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/**
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* @abstract This method can be used to give the user a chance to wrap an ASLayoutable in an ASLayoutSpec
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* just before it is added to a parent ASLayoutSpec. For example, if you wanted an ASTextNode that was always
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* inside of an ASInsetLayoutSpec, you could subclass ASTextNode and implement finalLayoutable so that it wraps
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* itself in an inset spec.
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*
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* Note that any ASLayoutable other than self that is returned MUST set isFinalLayoutable to YES. Make sure
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* to do this BEFORE adding a child to the ASLayoutable.
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*
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* @return The layoutable that will be added to the parent layout spec. Defaults to self.
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*/
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- (id<ASLayoutable>)finalLayoutable;
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/**
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* A flag to indicate that this ASLayoutable was created in finalLayoutable. This MUST be set to YES
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* before adding a child to this layoutable.
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*/
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@property (nonatomic, assign) BOOL isFinalLayoutable;
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/**
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* The class that holds all of the layoutOptions set on an ASLayoutable.
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*/
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@property (nonatomic, strong, readonly) ASLayoutOptions *layoutOptions;
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@end
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