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* Introduce ASCollectionViewLayout - `ASCollectionViewLayout` is an async `UICollectionViewLayout` that encapsulates its layout calculation logic into a separate thread-safe object which can be used ahead of time and/or on multiple threads. - `ASDataController` now can prepare for a new layout resulted from a change set before `ASCollectionView` even knows about it. By the time the change set it ready to be consumed by `ASCollectionView`, its new layout is also ready. - New `ASCollectionViewLayoutCalculating` protocol that is simple and generic enough that many types of calculators can be built on top. `ASCollectionViewLayoutSpecCalculator` conforms to `ASCollectionViewLayoutCalculating` protocol and can be backed by any layout spec (e.g `ASStackLayoutSpec`, `PIMasonryLayoutSpec`, etc). We can even build a `ASCollectionViewLayoutYogaCalculator` that uses Yoga internally. - A built-in `ASCollectionViewFlowLayoutCalculator` that is a subclass of `ASCollectionViewLayoutSpecCalculator` and uses a multi-threaded multi-line `ASStackLayoutSpec` internally. The result is a performant and thread-safe flow layout calculator. - Finally, `ASCollectionViewLayout` can be subclassed to handle a specific type of calculator with optimizations implemented based on the knowledge of such calculator. For example, `ASCollectionViewFlowLayout` can have a highly optimized implementation of `-layoutAttributesForElementsInRect:`. Protocolize layout calculator providing and consuming Add flex wrap documentation Add a `multithreaded` flag to ASStackLayoutSpec that forces it to dispatch even if it's off main - Update ASCollectionViewFlowLayoutSpecCalculator to use that flag. Minor change in ASCollectionViewLayout Implement Mosaic layout calculator Minor change Fix project file Rename and fix project file Skip fetching constrained size only if a layout calculator is available Update examples/ASCollectionView Remove unnecessary change in ASTableView Address comments Rename collection view calculator protocols Minor changes after rebasing with master Add ASLegacyCollectionLayoutCalculator for backward compatibility Remove ASCollectionLayoutSpecCalculator Remove ASLegacyCollectionLayoutCalculator Introduce ASCollectionLayout - A wrapper object that contains content size and an element to rect table. - Collection layout calculators to return this new object instead of an ASLayout. Before adding a content cache Finishing hooking up ASCollectionLayoutDataSource to ASCollectionNode Stash Finish ASCollectionLayout Rough impl of ASCollectionFlowLayout Revert changes in CustomCollectionView example Move ASRectTable back to Private * Rename ASCollectionContentAttributes to ASCollectionLayoutState * Address other comments * Introduce ASCollectionLayoutDelegate and make ASCollectionLayout private * Address comments * API tweaks: - Replace `-layoutContextWithElementMap:` in ASCollectionLayoutDelegate with `-additionalInfoForLayoutWithElements:`. The returned object is then stored in ASCollectionLayoutContext for later lookups. - ASCollectionLayoutContext has no public initializer. - ASDataControllerLayoutDelegate no longer requires a context of type ASCollectionLayoutContext but simply an `id`. This helps decouple ASDataController and ASCollectionLayout. - Rename `elementMap` to `elements`. - Rename `visibleMap` to `visibleElements`. - Other minor changes. * Rename ASCGSizeHash to ASHashFromCGSize * Make sure to call super in -[ASCollectionLayout prepareLayout] * Update example/ASCollectionView to use ASCollectionFlowLayoutDelegate * Remove unnecessary change
114 lines
5.9 KiB
Objective-C
114 lines
5.9 KiB
Objective-C
//
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// ASStackLayoutSpec.h
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// AsyncDisplayKit
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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 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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#import <AsyncDisplayKit/ASLayoutSpec.h>
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#import <AsyncDisplayKit/ASStackLayoutDefines.h>
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NS_ASSUME_NONNULL_BEGIN
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/**
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A simple layout spec that stacks a list of children vertically or horizontally.
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- All children are initially laid out with the an infinite available size in the stacking direction.
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- In the other direction, this spec's constraint is passed.
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- The children's sizes are summed in the stacking direction.
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- If this sum is less than this spec's minimum size in stacking direction, children with flexGrow are flexed.
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- If it is greater than this spec's maximum size in the stacking direction, children with flexShrink are flexed.
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- If, even after flexing, the sum is still greater than this spec's maximum size in the stacking direction,
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justifyContent determines how children are laid out.
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For example:
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- Suppose stacking direction is Vertical, min-width=100, max-width=300, min-height=200, max-height=500.
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- All children are laid out with min-width=100, max-width=300, min-height=0, max-height=INFINITY.
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- If the sum of the childrens' heights is less than 200, children with flexGrow are flexed larger.
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- If the sum of the childrens' heights is greater than 500, children with flexShrink are flexed smaller.
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Each child is shrunk by `((sum of heights) - 500)/(number of flexShrink-able children)`.
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- If the sum of the childrens' heights is greater than 500 even after flexShrink-able children are flexed,
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justifyContent determines how children are laid out.
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*/
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@interface ASStackLayoutSpec : ASLayoutSpec
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/**
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Specifies the direction children are stacked in. If horizontalAlignment and verticalAlignment were set,
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they will be resolved again, causing justifyContent and alignItems to be updated accordingly
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*/
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@property (nonatomic, assign) ASStackLayoutDirection direction;
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/** The amount of space between each child. */
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@property (nonatomic, assign) CGFloat spacing;
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/**
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Specifies how children are aligned horizontally. Depends on the stack direction, setting the alignment causes either
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justifyContent or alignItems to be updated. The alignment will remain valid after future direction changes.
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Thus, it is preferred to those properties
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*/
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@property (nonatomic, assign) ASHorizontalAlignment horizontalAlignment;
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/**
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Specifies how children are aligned vertically. Depends on the stack direction, setting the alignment causes either
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justifyContent or alignItems to be updated. The alignment will remain valid after future direction changes.
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Thus, it is preferred to those properties
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*/
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@property (nonatomic, assign) ASVerticalAlignment verticalAlignment;
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/** The amount of space between each child. Defaults to ASStackLayoutJustifyContentStart */
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@property (nonatomic, assign) ASStackLayoutJustifyContent justifyContent;
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/** Orientation of children along cross axis. Defaults to ASStackLayoutAlignItemsStretch */
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@property (nonatomic, assign) ASStackLayoutAlignItems alignItems;
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/** Whether children are stacked into a single or multiple lines. Defaults to single line (ASStackLayoutFlexWrapNoWrap) */
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@property (nonatomic, assign) ASStackLayoutFlexWrap flexWrap;
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/** Orientation of lines along cross axis if there are multiple lines. Defaults to ASStackLayoutAlignContentStart */
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@property (nonatomic, assign) ASStackLayoutAlignContent alignContent;
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/** Whether this stack can dispatch to other threads, regardless of which thread it's running on */
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@property (nonatomic, assign, getter=isConcurrent) BOOL concurrent;
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- (instancetype)init;
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/**
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@param direction The direction of the stack view (horizontal or vertical)
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@param spacing The spacing between the children
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@param justifyContent If no children are flexible, this describes how to fill any extra space
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@param alignItems Orientation of the children along the cross axis
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@param children ASLayoutElement children to be positioned.
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*/
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+ (instancetype)stackLayoutSpecWithDirection:(ASStackLayoutDirection)direction
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spacing:(CGFloat)spacing
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justifyContent:(ASStackLayoutJustifyContent)justifyContent
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alignItems:(ASStackLayoutAlignItems)alignItems
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children:(NSArray<id<ASLayoutElement>> *)children AS_WARN_UNUSED_RESULT;
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/**
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@param direction The direction of the stack view (horizontal or vertical)
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@param spacing The spacing between the children
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@param justifyContent If no children are flexible, this describes how to fill any extra space
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@param alignItems Orientation of the children along the cross axis
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@param flexWrap Whether children are stacked into a single or multiple lines
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@param alignContent Orientation of lines along cross axis if there are multiple lines
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@param children ASLayoutElement children to be positioned.
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*/
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+ (instancetype)stackLayoutSpecWithDirection:(ASStackLayoutDirection)direction
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spacing:(CGFloat)spacing
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justifyContent:(ASStackLayoutJustifyContent)justifyContent
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alignItems:(ASStackLayoutAlignItems)alignItems
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flexWrap:(ASStackLayoutFlexWrap)flexWrap
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alignContent:(ASStackLayoutAlignContent)alignContent
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children:(NSArray<id<ASLayoutElement>> *)children AS_WARN_UNUSED_RESULT;
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/**
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* @return A stack layout spec with direction of ASStackLayoutDirectionVertical
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**/
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+ (instancetype)verticalStackLayoutSpec AS_WARN_UNUSED_RESULT;
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/**
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* @return A stack layout spec with direction of ASStackLayoutDirectionHorizontal
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**/
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+ (instancetype)horizontalStackLayoutSpec AS_WARN_UNUSED_RESULT;
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@end
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NS_ASSUME_NONNULL_END
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