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69 lines
1.9 KiB
Plaintext
69 lines
1.9 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 "ASOverlayLayoutSpec.h"
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#import "ASAssert.h"
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#import "ASBaseDefines.h"
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#import "ASLayout.h"
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@implementation ASOverlayLayoutSpec
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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)initWithChild:(id<ASLayoutable>)child overlay:(id<ASLayoutable>)overlay
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{
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if (!(self = [super init])) {
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return nil;
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}
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ASDisplayNodeAssertNotNil(child, @"Child that will be overlayed on shouldn't be nil");
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_overlay = overlay;
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_child = child;
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return self;
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}
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+ (instancetype)overlayLayoutSpecWithChild:(id<ASLayoutable>)child overlay:(id<ASLayoutable>)overlay
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{
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return [[self alloc] initWithChild:child overlay:overlay];
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}
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- (void)setChild:(id<ASLayoutable>)child
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{
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ASDisplayNodeAssert(self.isMutable, @"Cannot set properties when layout spec is not mutable");
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_child = child;
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}
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- (void)setOverlay:(id<ASLayoutable>)overlay
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{
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ASDisplayNodeAssert(self.isMutable, @"Cannot set properties when layout spec is not mutable");
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_overlay = overlay;
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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 *)measureWithSizeRange:(ASSizeRange)constrainedSize
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{
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ASLayout *contentsLayout = [_child measureWithSizeRange:constrainedSize];
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contentsLayout.position = CGPointZero;
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NSMutableArray *sublayouts = [NSMutableArray arrayWithObject:contentsLayout];
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if (_overlay) {
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ASLayout *overlayLayout = [_overlay measureWithSizeRange:{contentsLayout.size, contentsLayout.size}];
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overlayLayout.position = CGPointZero;
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[sublayouts addObject:overlayLayout];
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}
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return [ASLayout layoutWithLayoutableObject:self size:contentsLayout.size sublayouts:sublayouts];
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}
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@end
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