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47 lines
1.7 KiB
Objective-C
47 lines
1.7 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 <AsyncDisplayKit/ASDimension.h>
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#import <AsyncDisplayKit/ASStackLayoutDefines.h>
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#import <AsyncDisplayKit/ASLayoutOptions.h>
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@class ASLayout;
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@class ASLayoutSpec;
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/**
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* The ASLayoutable protocol declares a method for measuring the layout of an object. A class must implement the method
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* so that instances of that class can be used to build layout trees. The protocol also provides information
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* about how an object should be laid out within an ASStackLayoutSpec.
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*/
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@protocol ASLayoutable <NSObject>
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/**
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* @abstract Calculate a layout based on given size range.
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*
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* @param constrainedSize The minimum and maximum sizes the receiver should fit in.
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*
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* @return An ASLayout instance defining the layout of the receiver and its children.
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*/
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- (ASLayout *)measureWithSizeRange:(ASSizeRange)constrainedSize;
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/**
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@abstract Give this object a last chance to add itself to a container ASLayoutable (most likely an ASLayoutSpec) before
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being added to a ASLayoutSpec.
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For example, consider a node whose superclass is laid out via calculateLayoutThatFits:. The subclass cannot implement
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layoutSpecThatFits: since its ASLayout is already being created by calculateLayoutThatFits:. By implementing this method
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a subclass can wrap itself in an ASLayoutSpec right before it is added to a layout spec.
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It is rare that a class will need to implement this method.
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*/
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- (id<ASLayoutable>)finalLayoutable;
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@end
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