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dc3be352af
- Add content offset bridging property to table and collection node - And use it in `ASCollectionLayout` to avoid measuring unrelated nodes during the first layout. - Update CHANGELOG and highlight deprecated methods
108 lines
3.3 KiB
Objective-C
108 lines
3.3 KiB
Objective-C
//
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// ASCollectionLayoutContext.m
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// Texture
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//
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// Copyright (c) 2017-present, Pinterest, Inc. All rights reserved.
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// 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/ASCollectionLayoutContext.h>
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#import <AsyncDisplayKit/ASCollectionLayoutContext+Private.h>
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#import <AsyncDisplayKit/ASAssert.h>
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#import <AsyncDisplayKit/ASCollectionLayoutDelegate.h>
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#import <AsyncDisplayKit/ASCollectionLayoutCache.h>
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#import <AsyncDisplayKit/ASElementMap.h>
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#import <AsyncDisplayKit/ASEqualityHelpers.h>
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#import <AsyncDisplayKit/ASHashing.h>
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@implementation ASCollectionLayoutContext {
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Class<ASCollectionLayoutDelegate> _layoutDelegateClass;
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__weak ASCollectionLayoutCache *_layoutCache;
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}
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- (instancetype)initWithViewportSize:(CGSize)viewportSize
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initialContentOffset:(CGPoint)initialContentOffset
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scrollableDirections:(ASScrollDirection)scrollableDirections
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elements:(ASElementMap *)elements
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layoutDelegateClass:(Class<ASCollectionLayoutDelegate>)layoutDelegateClass
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layoutCache:(ASCollectionLayoutCache *)layoutCache
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additionalInfo:(id)additionalInfo
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{
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self = [super init];
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if (self) {
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_viewportSize = viewportSize;
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_initialContentOffset = initialContentOffset;
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_scrollableDirections = scrollableDirections;
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_elements = elements;
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_layoutDelegateClass = layoutDelegateClass;
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_layoutCache = layoutCache;
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_additionalInfo = additionalInfo;
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}
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return self;
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}
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- (Class<ASCollectionLayoutDelegate>)layoutDelegateClass
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{
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return _layoutDelegateClass;
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}
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- (ASCollectionLayoutCache *)layoutCache
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{
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return _layoutCache;
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}
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// NOTE: Some properties, like initialContentOffset and layoutCache are ignored in -isEqualToContext: and -hash.
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// That is because contexts can be equal regardless of the content offsets or layout caches.
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- (BOOL)isEqualToContext:(ASCollectionLayoutContext *)context
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{
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if (context == nil) {
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return NO;
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}
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// NOTE: ASObjectIsEqual returns YES when both objects are nil.
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// So don't use ASObjectIsEqual on _elements.
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// It is a weak property and 2 layouts generated from different sets of elements
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// should never be considered the same even if they are nil now.
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return CGSizeEqualToSize(_viewportSize, context.viewportSize)
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&& _scrollableDirections == context.scrollableDirections
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&& [_elements isEqual:context.elements]
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&& _layoutDelegateClass == context.layoutDelegateClass
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&& ASObjectIsEqual(_additionalInfo, context.additionalInfo);
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}
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- (BOOL)isEqual:(id)other
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{
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if (self == other) {
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return YES;
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}
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if (! [other isKindOfClass:[ASCollectionLayoutContext class]]) {
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return NO;
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}
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return [self isEqualToContext:other];
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}
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- (NSUInteger)hash
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{
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struct {
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CGSize viewportSize;
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ASScrollDirection scrollableDirections;
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NSUInteger elementsHash;
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NSUInteger layoutDelegateClassHash;
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NSUInteger additionalInfoHash;
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} data = {
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_viewportSize,
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_scrollableDirections,
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_elements.hash,
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_layoutDelegateClass.hash,
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[_additionalInfo hash]
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};
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return ASHashBytes(&data, sizeof(data));
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}
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@end
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