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125 lines
4.0 KiB
Objective-C
125 lines
4.0 KiB
Objective-C
//
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// ASPageTable.h
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// Texture
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//
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// Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
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//
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#ifndef MINIMAL_ASDK
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#import <Foundation/Foundation.h>
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#import <UIKit/UIKit.h>
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#import <AsyncDisplayKit/ASAssert.h>
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#import <AsyncDisplayKit/ASBaseDefines.h>
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@class ASCollectionElement;
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NS_ASSUME_NONNULL_BEGIN
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/**
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* Represents x and y coordinates of a page.
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*/
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typedef uintptr_t ASPageCoordinate;
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/**
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* Returns a page coordinate with the given x and y values. Both of them must be less than 65,535.
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*/
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AS_EXTERN ASPageCoordinate ASPageCoordinateMake(uint16_t x, uint16_t y) AS_WARN_UNUSED_RESULT;
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/**
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* Returns coordinate of the page that contains the specified point.
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* Similar to CGRectContainsPoint, a point is considered inside a page if its lie inside the page or on the minimum X or minimum Y edge.
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*
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* @param point The point that the page at the returned should contain. Any negative of the point will be corrected to 0.0
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*
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* @param pageSize The size of each page.
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*/
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AS_EXTERN ASPageCoordinate ASPageCoordinateForPageThatContainsPoint(CGPoint point, CGSize pageSize) AS_WARN_UNUSED_RESULT;
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AS_EXTERN uint16_t ASPageCoordinateGetX(ASPageCoordinate pageCoordinate) AS_WARN_UNUSED_RESULT;
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AS_EXTERN uint16_t ASPageCoordinateGetY(ASPageCoordinate pageCoordinate) AS_WARN_UNUSED_RESULT;
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AS_EXTERN CGRect ASPageCoordinateGetPageRect(ASPageCoordinate pageCoordinate, CGSize pageSize) AS_WARN_UNUSED_RESULT;
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/**
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* Returns coordinate pointers for pages that intersect the specified rect. For each pointer, use ASPageCoordinateFromPointer() to get the original coordinate.
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* The specified rect is restricted to the bounds of a content rect that has an origin of {0, 0} and a size of the given contentSize.
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*
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* @param rect The rect intersecting the target pages.
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*
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* @param contentSize The combined size of all pages.
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*
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* @param pageSize The size of each page.
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*/
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AS_EXTERN NSPointerArray * _Nullable ASPageCoordinatesForPagesThatIntersectRect(CGRect rect, CGSize contentSize, CGSize pageSize) AS_WARN_UNUSED_RESULT;
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/**
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* An alias for an NSMapTable created to store objects using ASPageCoordinates as keys.
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*
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* You should not call -objectForKey:, -setObject:forKey:, or -removeObjectForKey:
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* on these objects.
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*/
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typedef NSMapTable ASPageTable;
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/**
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* A page to array of layout attributes table.
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*/
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typedef ASPageTable<id, NSMutableArray<UICollectionViewLayoutAttributes *> *> ASPageToLayoutAttributesTable;
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/**
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* A category for creating & using map tables meant for storing objects using ASPage as keys.
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*/
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@interface NSMapTable<id, ObjectType> (ASPageTableMethods)
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/**
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* Creates a new page table with (NSMapTableStrongMemory | NSMapTableObjectPointerPersonality) for values.
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*/
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+ (ASPageTable *)pageTableForStrongObjectPointers NS_RETURNS_RETAINED;
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/**
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* Creates a new page table with (NSMapTableWeakMemory | NSMapTableObjectPointerPersonality) for values.
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*/
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+ (ASPageTable *)pageTableForWeakObjectPointers NS_RETURNS_RETAINED;
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/**
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* Builds a new page to layout attributes from the given layout attributes.
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*
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* @param layoutAttributesEnumerator The layout attributes to build from
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*
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* @param contentSize The combined size of all pages.
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*
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* @param pageSize The size of each page.
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*/
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+ (ASPageToLayoutAttributesTable *)pageTableWithLayoutAttributes:(id<NSFastEnumeration>)layoutAttributesEnumerator contentSize:(CGSize)contentSize pageSize:(CGSize)pageSize NS_RETURNS_RETAINED;
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/**
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* Retrieves the object for a given page, or nil if the page is not found.
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*
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* @param page A page to lookup the object for.
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*/
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- (nullable ObjectType)objectForPage:(ASPageCoordinate)page;
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/**
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* Sets the given object for the associated page.
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*
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* @param object The object to store as value.
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*
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* @param page The page to use for the rect.
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*/
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- (void)setObject:(ObjectType)object forPage:(ASPageCoordinate)page;
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/**
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* Removes the object for the given page, if one exists.
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*
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* @param page The page to remove.
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*/
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- (void)removeObjectForPage:(ASPageCoordinate)page;
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@end
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NS_ASSUME_NONNULL_END
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#endif
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