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98 lines
2.9 KiB
Plaintext
98 lines
2.9 KiB
Plaintext
//
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// ASBackgroundLayoutSpec.mm
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// Texture
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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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 /ASDK-Licenses directory of this source tree. An additional
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// grant of patent rights can be found in the PATENTS file in the same directory.
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//
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// Modifications to this file made after 4/13/2017 are: Copyright (c) 2017-present,
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// Pinterest, Inc. Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <AsyncDisplayKit/ASBackgroundLayoutSpec.h>
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#import <AsyncDisplayKit/ASLayoutSpec+Subclasses.h>
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#import <AsyncDisplayKit/ASAssert.h>
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static NSUInteger const kForegroundChildIndex = 0;
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static NSUInteger const kBackgroundChildIndex = 1;
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@implementation ASBackgroundLayoutSpec
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#pragma mark - Class
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+ (instancetype)backgroundLayoutSpecWithChild:(id<ASLayoutElement>)child background:(id<ASLayoutElement>)background;
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{
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return [[self alloc] initWithChild:child background:background];
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}
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#pragma mark - Lifecycle
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- (instancetype)initWithChild:(id<ASLayoutElement>)child background:(id<ASLayoutElement>)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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self.child = child;
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self.background = background;
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return self;
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}
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#pragma mark - ASLayoutSpec
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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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restrictedToSize:(ASLayoutElementSize)size
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relativeToParentSize:(CGSize)parentSize
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{
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ASLayout *contentsLayout = [self.child layoutThatFits:constrainedSize parentSize:parentSize];
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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 layoutThatFits:ASSizeRangeMake(contentsLayout.size)
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parentSize:parentSize];
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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 layoutWithLayoutElement:self size:contentsLayout.size sublayouts:sublayouts];
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}
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#pragma mark - Background
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- (void)setChild:(id<ASLayoutElement>)child
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{
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ASDisplayNodeAssertNotNil(child, @"Child cannot be nil");
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[super setChild:child atIndex:kForegroundChildIndex];
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}
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- (id<ASLayoutElement>)child
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{
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return [super childAtIndex:kForegroundChildIndex];
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}
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- (void)setBackground:(id<ASLayoutElement>)background
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{
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ASDisplayNodeAssertNotNil(background, @"Background cannot be nil");
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[super setChild:background atIndex:kBackgroundChildIndex];
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}
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- (id<ASLayoutElement>)background
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{
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return [super childAtIndex:kBackgroundChildIndex];
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}
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@end
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