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110 lines
4.1 KiB
Objective-C
110 lines
4.1 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/ASRelativeSize.h>
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#import <AsyncDisplayKit/ASStackLayoutDefines.h>
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#import <AsyncDisplayKit/ASStackLayoutable.h>
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#import <AsyncDisplayKit/ASStaticLayoutable.h>
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#import <AsyncDisplayKit/ASLayoutablePrivate.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 layout
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* is defined by an ASLayout return value, and must specify 1) the size (but not position) of the
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* layoutable object, and 2) the size and position of all of its immediate child objects. The tree
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* recursion is driven by parents requesting layouts from their children in order to determine their
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* size, followed by the parents setting the position of the children once the size is known
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*
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* The protocol also implements a "family" of Layoutable protocols. These protocols contain layout
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* options that can be used for specific layout specs. For example, ASStackLayoutSpec has options
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* defining how a layoutable should shrink or grow based upon available space.
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*
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* These layout options are all stored in an ASLayoutOptions class (that is defined in ASLayoutablePrivate).
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* Generally you needn't worry about the layout options class, as the layoutable protocols allow all direct
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* access to the options via convenience properties. If you are creating custom layout spec, then you can
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* extend the backing layout options class to accomodate any new layout options.
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*/
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@protocol ASLayoutable <ASStackLayoutable, ASStaticLayoutable, ASLayoutablePrivate>
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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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#pragma mark - Layout options from the Layoutable Protocols
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#pragma mark - ASStackLayoutable
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/**
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* @abstract Additional space to place before this object in the stacking direction.
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* Used when attached to a stack layout.
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*/
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@property (nonatomic, readwrite) CGFloat spacingBefore;
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/**
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* @abstract Additional space to place after this object in the stacking direction.
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* Used when attached to a stack layout.
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*/
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@property (nonatomic, readwrite) CGFloat spacingAfter;
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/**
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* @abstract If the sum of childrens' stack dimensions is less than the minimum size, should this object grow?
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* Used when attached to a stack layout.
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*/
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@property (nonatomic, readwrite) BOOL flexGrow;
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/**
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* @abstract If the sum of childrens' stack dimensions is greater than the maximum size, should this object shrink?
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* Used when attached to a stack layout.
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*/
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@property (nonatomic, readwrite) BOOL flexShrink;
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/**
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* @abstract Specifies the initial size in the stack dimension for this object.
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* Default to ASRelativeDimensionUnconstrained.
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* Used when attached to a stack layout.
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*/
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@property (nonatomic, readwrite) ASRelativeDimension flexBasis;
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/**
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* @abstract Orientation of the object along cross axis, overriding alignItems
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* Used when attached to a stack layout.
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*/
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@property (nonatomic, readwrite) ASStackLayoutAlignSelf alignSelf;
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/**
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* @abstract Used for baseline alignment. The distance from the top of the object to its baseline.
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*/
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@property (nonatomic, readwrite) CGFloat ascender;
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/**
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* @abstract Used for baseline alignment. The distance from the baseline of the object to its bottom.
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*/
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@property (nonatomic, readwrite) CGFloat descender;
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#pragma mark - ASStaticLayoutable
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/**
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If specified, the child's size is restricted according to this size. Percentages are resolved relative to the static layout spec.
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*/
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@property (nonatomic, assign) ASRelativeSizeRange sizeRange;
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/** The position of this object within its parent spec. */
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@property (nonatomic, assign) CGPoint layoutPosition;
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@end
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