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93 lines
2.8 KiB
Plaintext
93 lines
2.8 KiB
Plaintext
//
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// ASOverlayLayoutSpec.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/ASOverlayLayoutSpec.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 kUnderlayChildIndex = 0;
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static NSUInteger const kOverlayChildIndex = 1;
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@implementation ASOverlayLayoutSpec
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#pragma mark - Class
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+ (instancetype)overlayLayoutSpecWithChild:(id<ASLayoutElement>)child overlay:(id<ASLayoutElement>)overlay
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{
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return [[self alloc] initWithChild:child overlay:overlay];
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}
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#pragma mark - Lifecycle
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- (instancetype)initWithChild:(id<ASLayoutElement>)child overlay:(id<ASLayoutElement>)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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self.child = child;
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self.overlay = overlay;
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return self;
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}
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#pragma mark - Setter / Getter
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- (void)setChild:(id<ASLayoutElement>)child
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{
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ASDisplayNodeAssertNotNil(child, @"Child that will be overlayed on shouldn't be nil");
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[super setChild:child atIndex:kUnderlayChildIndex];
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}
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- (id<ASLayoutElement>)child
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{
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return [super childAtIndex:kUnderlayChildIndex];
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}
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- (void)setOverlay:(id<ASLayoutElement>)overlay
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{
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ASDisplayNodeAssertNotNil(overlay, @"Overlay cannot be nil");
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[super setChild:overlay atIndex:kOverlayChildIndex];
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}
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- (id<ASLayoutElement>)overlay
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{
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return [super childAtIndex:kOverlayChildIndex];
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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 overlay on top of it.
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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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contentsLayout.position = CGPointZero;
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NSMutableArray *sublayouts = [NSMutableArray arrayWithObject:contentsLayout];
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if (self.overlay) {
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ASLayout *overlayLayout = [self.overlay layoutThatFits:ASSizeRangeMake(contentsLayout.size)
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parentSize: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 layoutWithLayoutElement:self size:contentsLayout.size sublayouts:sublayouts];
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}
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@end
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