mirror of
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83 lines
2.2 KiB
Plaintext
83 lines
2.2 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 "ASBackgroundLayoutSpec.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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static NSString * const kBackgroundChildKey = @"kBackgroundChildKey";
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@interface ASBackgroundLayoutSpec ()
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@end
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@implementation ASBackgroundLayoutSpec
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- (instancetype)initWithChild:(id<ASLayoutable>)child background:(id<ASLayoutable>)background
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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 cannot be nil");
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[self setChild:child];
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self.background = background;
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return self;
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}
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+ (instancetype)backgroundLayoutSpecWithChild:(id<ASLayoutable>)child background:(id<ASLayoutable>)background;
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{
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return [[self alloc] initWithChild:child background:background];
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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 *)measureWithSizeRange:(ASSizeRange)constrainedSize
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{
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ASLayout *contentsLayout = [[self child] measureWithSizeRange:constrainedSize];
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NSMutableArray *sublayouts = [NSMutableArray arrayWithCapacity:2];
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if (self.background) {
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// Size background to exactly the same size.
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ASLayout *backgroundLayout = [self.background measureWithSizeRange:{contentsLayout.size, contentsLayout.size}];
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backgroundLayout.position = CGPointZero;
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[sublayouts addObject:backgroundLayout];
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}
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contentsLayout.position = CGPointZero;
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[sublayouts addObject:contentsLayout];
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return [ASLayout layoutWithLayoutableObject:self size:contentsLayout.size sublayouts:sublayouts];
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}
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- (void)setBackground:(id<ASLayoutable>)background
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{
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[super setChild:background forIdentifier:kBackgroundChildKey];
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}
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- (id<ASLayoutable>)background
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{
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return [super childForIdentifier:kBackgroundChildKey];
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}
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- (void)setChildren:(NSArray *)children
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{
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ASDisplayNodeAssert(NO, @"not supported by this layout spec");
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}
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- (NSArray *)children
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{
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ASDisplayNodeAssert(NO, @"not supported by this layout spec");
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return nil;
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}
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@end
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