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2f99951732
* Initial commit to move [ASLayoutSpec children] from std::map to NSMutableArray * Add NSFastEnumeration to ASLayoutable * ASNullLayoutSpec is a Singleton now * Move ASLayoutSpecPrivate in Private folder * Move to NSArrayPointer and remove ASNullLayoutSpec * Revert "Move to NSArrayPointer and remove ASNullLayoutSpec" This reverts commit 9ab9cf7024b1f6e1984d84fe58af2b84e84cdf94. * Move to childAtIndex: and setChild:atIndex:
111 lines
3.0 KiB
Plaintext
111 lines
3.0 KiB
Plaintext
//
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// ASLayoutSpec+Subclasses.m
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// AsyncDisplayKit
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//
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// Created by Michael Schneider on 9/15/16.
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// Copyright © 2016 Facebook. All rights reserved.
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//
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#import "ASLayoutSpec+Subclasses.h"
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#import "ASLayoutSpec.h"
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#import "ASLayoutSpecPrivate.h"
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#pragma mark - ASNullLayoutSpec
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@interface ASNullLayoutSpec : ASLayoutSpec
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- (instancetype)init __unavailable;
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+ (ASNullLayoutSpec *)null;
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@end
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@implementation ASNullLayoutSpec : ASLayoutSpec
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+ (ASNullLayoutSpec *)null
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{
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static ASNullLayoutSpec *sharedNullLayoutSpec = nil;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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sharedNullLayoutSpec = [[self alloc] init];
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});
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return sharedNullLayoutSpec;
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}
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- (BOOL)isMutable
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{
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return NO;
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}
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- (ASLayout *)calculateLayoutThatFits:(ASSizeRange)constrainedSize
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{
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return [ASLayout layoutWithLayoutable:self size:CGSizeZero];
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}
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@end
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#pragma mark - ASLayoutSpec (Subclassing)
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@implementation ASLayoutSpec (Subclassing)
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#pragma mark - Final layoutable
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- (id<ASLayoutable>)layoutableToAddFromLayoutable:(id<ASLayoutable>)child
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{
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if (self.isFinalLayoutable == NO) {
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id<ASLayoutable> finalLayoutable = [child finalLayoutable];
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if (finalLayoutable != child) {
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if (ASEnvironmentStatePropagationEnabled()) {
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ASEnvironmentStatePropagateUp(finalLayoutable, child.environmentState.layoutOptionsState);
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} else {
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// If state propagation is not enabled the layout options state needs to be copied manually
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ASEnvironmentState finalLayoutableEnvironmentState = finalLayoutable.environmentState;
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finalLayoutableEnvironmentState.layoutOptionsState = child.environmentState.layoutOptionsState;
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finalLayoutable.environmentState = finalLayoutableEnvironmentState;
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}
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return finalLayoutable;
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}
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}
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return child;
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}
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#pragma mark - Child with index
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- (void)setChild:(id<ASLayoutable>)child atIndex:(NSUInteger)index
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{
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ASDisplayNodeAssert(self.isMutable, @"Cannot set properties when layout spec is not mutable");
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id<ASLayoutable> layoutable = child ? [self layoutableToAddFromLayoutable:child] : [ASNullLayoutSpec null];
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if (child) {
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if (_childrenArray.count < index) {
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// Fill up the array with null objects until the index
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NSInteger i = _childrenArray.count;
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while (i < index) {
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_childrenArray[i] = [ASNullLayoutSpec null];
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i++;
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}
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}
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}
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// Replace object at the given index with the layoutable
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_childrenArray[index] = layoutable;
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// TODO: Should we propagate up the layoutable at it could happen that multiple children will propagated up their
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// layout options and one child will overwrite values from another child
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// [self propagateUpLayoutable:finalLayoutable];
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}
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- (id<ASLayoutable>)childAtIndex:(NSUInteger)index
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{
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id<ASLayoutable> layoutable = nil;
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if (index < _childrenArray.count) {
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layoutable = _childrenArray[index];
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}
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// Null layoutable should not be accessed
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ASDisplayNodeAssert(layoutable != [ASNullLayoutSpec null], @"Access child at index without set a child at that index");
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return layoutable;
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}
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@end
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