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56 lines
1.5 KiB
Plaintext
56 lines
1.5 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 "ASOverlayLayoutNode.h"
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#import "ASAssert.h"
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#import "ASBaseDefines.h"
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@implementation ASOverlayLayoutNode
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{
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id<ASLayoutable> _overlay;
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id<ASLayoutable> _child;
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}
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+ (instancetype)newWithChild:(id<ASLayoutable>)child overlay:(id<ASLayoutable>)overlay
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{
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ASOverlayLayoutNode *n = [super new];
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if (n) {
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ASDisplayNodeAssertNotNil(child, @"Child that will be overlayed on shouldn't be nil");
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n->_overlay = overlay;
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n->_child = child;
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}
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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 overlay on top of it.
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*/
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- (ASLayout *)calculateLayoutThatFits:(ASSizeRange)constrainedSize
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{
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ASLayout *contentsLayout = [_child calculateLayoutThatFits:constrainedSize];
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contentsLayout.position = CGPointZero;
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NSMutableArray *layoutChildren = [NSMutableArray arrayWithObject:contentsLayout];
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if (_overlay) {
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ASLayout *overlayLayout = [_overlay calculateLayoutThatFits:{contentsLayout.size, contentsLayout.size}];
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overlayLayout.position = CGPointZero;
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[layoutChildren addObject:overlayLayout];
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}
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return [ASLayout newWithLayoutableObject:self size:contentsLayout.size children:layoutChildren];
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}
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@end
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