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62 lines
1.6 KiB
Plaintext
62 lines
1.6 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 "ASBackgroundLayoutNode.h"
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#import "ASAssert.h"
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#import "ASBaseDefines.h"
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#import "ASLayoutNodeSubclass.h"
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@interface ASBackgroundLayoutNode ()
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{
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ASLayoutNode *_node;
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ASLayoutNode *_background;
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}
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@end
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@implementation ASBackgroundLayoutNode
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+ (instancetype)newWithNode:(ASLayoutNode *)node background:(ASLayoutNode *)background
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{
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if (node == nil) {
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return nil;
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}
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ASBackgroundLayoutNode *n = [super new];
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n->_node = node;
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n->_background = background;
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return n;
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}
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+ (instancetype)new
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{
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ASDISPLAYNODE_NOT_DESIGNATED_INITIALIZER();
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}
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/**
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First layout the contents, then fit the background image.
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*/
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- (ASLayout *)calculateLayoutThatFits:(ASSizeRange)constrainedSize
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{
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ASLayout *contentsLayout = [_node calculateLayoutThatFits:constrainedSize];
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NSMutableArray *children = [NSMutableArray arrayWithCapacity:2];
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if (_background) {
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// Size background to exactly the same size.
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ASLayout *backgroundLayout = [_background calculateLayoutThatFits:{contentsLayout.size, contentsLayout.size}];
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[children addObject:[ASLayoutChild newWithPosition:{0,0} layout:backgroundLayout]];
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}
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[children addObject:[ASLayoutChild newWithPosition:{0,0} layout:contentsLayout]];
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return [ASLayout newWithNode:self size:contentsLayout.size children:children];
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}
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@end
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