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62 lines
1.8 KiB
Plaintext
62 lines
1.8 KiB
Plaintext
/*
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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 "ASLayout.h"
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#import "ASAssert.h"
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CGPoint const CGPointNull = {NAN, NAN};
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extern BOOL CGPointIsNull(CGPoint point)
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{
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return isnan(point.x) && isnan(point.y);
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}
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@implementation ASLayout
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+ (instancetype)newWithLayoutableObject:(id<ASLayoutable>)layoutableObject
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size:(CGSize)size
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position:(CGPoint)position
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children:(NSArray *)children
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{
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for (ASLayout *child in children) {
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ASDisplayNodeAssert(!CGPointIsNull(child.position), @"Invalid position is not allowed in children.");
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}
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ASLayout *l = [super new];
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if (l) {
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l->_layoutableObject = layoutableObject;
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l->_size = size;
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l->_position = position;
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l->_children = [children copy];
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}
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return l;
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}
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+ (instancetype)newWithLayoutableObject:(id<ASLayoutable>)layoutableObject
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size:(CGSize)size
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children:(NSArray *)children
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{
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return [self newWithLayoutableObject:layoutableObject size:size position:CGPointNull children:children];
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}
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+ (instancetype)newWithLayoutableObject:(id<ASLayoutable>)layoutableObject size:(CGSize)size
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{
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return [self newWithLayoutableObject:layoutableObject size:size children:nil];
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}
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- (void)setPosition:(CGPoint)position
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{
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ASDisplayNodeAssert(CGPointIsNull(_position), @"Position can be set once and only once.");
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ASDisplayNodeAssert(!CGPointIsNull(position), @"Position must not be set to null.");
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_position = position;
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}
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@end
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