//
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// MASConstraint+Private.h
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// Masonry
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//
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// Created by Nick Tymchenko on 29/04/14.
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// Copyright (c) 2014 cloudling. All rights reserved.
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//
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#import "MASConstraint.h"
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@protocol MASConstraintDelegate;
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@interface MASConstraint ()
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/**
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* Whether or not to check for an existing constraint instead of adding constraint
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*/
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@property (nonatomic, assign) BOOL updateExisting;
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/**
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* Usually MASConstraintMaker but could be a parent MASConstraint
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*/
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@property (nonatomic, weak) id<MASConstraintDelegate> delegate;
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/**
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* Based on a provided value type, is equal to calling:
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* NSNumber - setOffset:
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* NSValue with CGPoint - setPointOffset:
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* NSValue with CGSize - setSizeOffset:
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* NSValue with MASEdgeInsets - setInsets:
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*/
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- (void)setLayoutConstantWithValue:(NSValue *)value;
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@end
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@interface MASConstraint (Abstract)
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/**
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* Sets the constraint relation to given NSLayoutRelation
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* returns a block which accepts one of the following:
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* MASViewAttribute, UIView, NSValue, NSArray
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* see readme for more details.
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*/
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- (MASConstraint * (^)(id, NSLayoutRelation))equalToWithRelation;
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/**
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* Override to set a custom chaining behaviour
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*/
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- (MASConstraint *)addConstraintWithLayoutAttribute:(NSLayoutAttribute)layoutAttribute;
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@end
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@protocol MASConstraintDelegate <NSObject>
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/**
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* Notifies the delegate when the constraint needs to be replaced with another constraint. For example
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* A MASViewConstraint may turn into a MASCompositeConstraint when an array is passed to one of the equality blocks
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*/
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- (void)constraint:(MASConstraint *)constraint shouldBeReplacedWithConstraint:(MASConstraint *)replacementConstraint;
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- (MASConstraint *)constraint:(MASConstraint *)constraint addConstraintWithLayoutAttribute:(NSLayoutAttribute)layoutAttribute;
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@end
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