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ca2885cf06
* Implement ASPageTable - It is a screen page table that can be used to quickly filter out objects in a certain rect without checking each and every one of them. - ASCollectionLayoutState generates and keeps a table that maps page to layout attributes within that page. - ASCollectionLayout (and later, ASCollectionGalleryLayoutDelegate) consults its layout state for `layoutAttributesForElementsInRect:`. This ensures the method can return as quickly as possible, especially on a large data set (I heard some people have galleries with thousands of photos!). * Address comments * Handle items that span multiple pages * Make danger happy
88 lines
3.5 KiB
Objective-C
88 lines
3.5 KiB
Objective-C
//
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// ASCollectionFlowLayoutDelegate.m
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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/ASCollectionFlowLayoutDelegate.h>
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#import <AsyncDisplayKit/ASCellNode.h>
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#import <AsyncDisplayKit/ASCollectionLayoutState.h>
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#import <AsyncDisplayKit/ASCollectionElement.h>
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#import <AsyncDisplayKit/ASCollectionLayoutContext.h>
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#import <AsyncDisplayKit/ASElementMap.h>
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#import <AsyncDisplayKit/ASLayout.h>
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#import <AsyncDisplayKit/ASStackLayoutSpec.h>
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@implementation ASCollectionFlowLayoutDelegate {
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ASScrollDirection _scrollableDirections;
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}
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- (instancetype)init
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{
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return [self initWithScrollableDirections:ASScrollDirectionVerticalDirections];
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}
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- (instancetype)initWithScrollableDirections:(ASScrollDirection)scrollableDirections
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{
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self = [super init];
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if (self) {
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_scrollableDirections = scrollableDirections;
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}
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return self;
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}
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- (ASSizeRange)sizeRangeThatFits:(CGSize)viewportSize
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{
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ASSizeRange sizeRange = ASSizeRangeUnconstrained;
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if (ASScrollDirectionContainsVerticalDirection(_scrollableDirections) == NO) {
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sizeRange.min.height = viewportSize.height;
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sizeRange.max.height = viewportSize.height;
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}
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if (ASScrollDirectionContainsHorizontalDirection(_scrollableDirections) == NO) {
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sizeRange.min.width = viewportSize.width;
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sizeRange.max.width = viewportSize.width;
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}
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return sizeRange;
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}
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- (id)additionalInfoForLayoutWithElements:(ASElementMap *)elements
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{
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return nil;
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}
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- (ASCollectionLayoutState *)calculateLayoutWithContext:(ASCollectionLayoutContext *)context
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{
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ASElementMap *elements = context.elements;
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NSMutableArray<ASCellNode *> *children = ASArrayByFlatMapping(elements.itemElements, ASCollectionElement *element, element.node);
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if (children.count == 0) {
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return [[ASCollectionLayoutState alloc] initWithContext:context
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contentSize:CGSizeZero
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elementToLayoutAttributesTable:[NSMapTable elementToLayoutAttributesTable]];
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}
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ASStackLayoutSpec *stackSpec = [ASStackLayoutSpec stackLayoutSpecWithDirection:ASStackLayoutDirectionHorizontal
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spacing:0
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justifyContent:ASStackLayoutJustifyContentStart
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alignItems:ASStackLayoutAlignItemsStart
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flexWrap:ASStackLayoutFlexWrapWrap
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alignContent:ASStackLayoutAlignContentStart
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children:children];
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stackSpec.concurrent = YES;
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ASLayout *layout = [stackSpec layoutThatFits:[self sizeRangeThatFits:context.viewportSize]];
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return [[ASCollectionLayoutState alloc] initWithContext:context layout:layout];
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}
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@end
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