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86 lines
3.9 KiB
Objective-C
86 lines
3.9 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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#import <AsyncDisplayKit/ASLayoutSpec.h>
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@protocol ASLayoutable;
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/**
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* A store for all of the options defined by ASLayoutSpec subclasses. All implementors of ASLayoutable own a
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* ASLayoutOptions. When certain layoutSpecs need option values, they are read from this class.
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*
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* Unless you wish to create a custom layout spec, ASLayoutOptions can largerly be ignored. Instead you can access
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* the layout option properties exposed in ASLayoutable directly, which will set the values in ASLayoutOptions
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* behind the scenes.
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*/
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@interface ASLayoutOptions : NSObject <ASStackLayoutable, ASStaticLayoutable, NSCopying>
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/**
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* Sets the class name for the ASLayoutOptions subclasses that will be created when a node or layoutSpec's options
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* are first accessed.
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*
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* If you create a custom layoutSpec that includes new options, you will want to subclass ASLayoutOptions to add
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* the new layout options for your layoutSpec(s). In order to make sure your subclass is created instead of an
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* instance of ASLayoutOptions, call setDefaultLayoutOptionsClass: early in app launch (applicationDidFinishLaunching:)
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* with your subclass's class.
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*
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* @param defaultLayoutOptionsClass The class of ASLayoutOptions that will be lazily created for a node or layout spec.
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*/
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+ (void)setDefaultLayoutOptionsClass:(Class)defaultLayoutOptionsClass;
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/**
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* @return the Class of ASLayoutOptions that will be created for a node or layoutspec. Defaults to [ASLayoutOptions class];
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*/
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+ (Class)defaultLayoutOptionsClass;
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#pragma mark - Subclasses should implement these!
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/**
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* Initializes a new ASLayoutOptions using the given layoutable to assign any intrinsic option values.
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* This init function sets a sensible default value for each layout option. If you create a subclass of
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* ASLayoutOptions, your subclass should do the same.
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*
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* @param layoutable The layoutable that will own these options. The layoutable will be used to set any intrinsic
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* layoutOptions. For example, if the layoutable is an ASTextNode the ascender/descender values will get set.
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*
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* @return a new instance of ASLayoutOptions
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*/
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- (instancetype)initWithLayoutable:(id<ASLayoutable>)layoutable;
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/**
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* Copies the values of layoutOptions into self. This is useful when placing a layoutable inside of another. Consider
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* an ASTextNode that you want to align to the baseline by putting it in an ASStackLayoutSpec. Before that, you want
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* to inset the ASTextNode by placing it in an ASInsetLayoutSpec. An ASInsetLayoutSpec will not have any information
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* about the ASTextNode's ascender/descender unless we copy over the layout options from ASTextNode to ASInsetLayoutSpec.
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* This is done automatically and should not need to be called directly. It is listed here to make sure that any
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* ASLayoutOptions subclass implements the method.
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*
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* @param layoutOptions The layoutOptions to copy from
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*/
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- (void)copyIntoOptions:(ASLayoutOptions *)layoutOptions;
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#pragma mark - ASStackLayoutable
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@property (nonatomic, readwrite) CGFloat spacingBefore;
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@property (nonatomic, readwrite) CGFloat spacingAfter;
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@property (nonatomic, readwrite) BOOL flexGrow;
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@property (nonatomic, readwrite) BOOL flexShrink;
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@property (nonatomic, readwrite) ASRelativeDimension flexBasis;
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@property (nonatomic, readwrite) ASStackLayoutAlignSelf alignSelf;
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@property (nonatomic, readwrite) CGFloat ascender;
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@property (nonatomic, readwrite) CGFloat descender;
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#pragma mark - ASStaticLayoutable
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@property (nonatomic, readwrite) ASRelativeSizeRange sizeRange;
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@property (nonatomic, readwrite) CGPoint layoutPosition;
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@end
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