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39298f6694
Caching the envTraitCollection upon creation of `ASIndexedNodeContext` can lead to it becoming out of date. Ask the `id<ASEnvironment>` object for the trait collection when we need it.
83 lines
2.4 KiB
Plaintext
83 lines
2.4 KiB
Plaintext
//
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// ASIndexedNodeContext.mm
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// AsyncDisplayKit
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//
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// Created by Huy Nguyen on 2/28/16.
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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 "ASIndexedNodeContext.h"
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#import "ASEnvironmentInternal.h"
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#import "ASCellNode+Internal.h"
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#import <mutex>
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@interface ASIndexedNodeContext ()
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/// Required node block used to allocate a cell node. Nil after the first execution.
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@property (nonatomic, strong) ASCellNodeBlock nodeBlock;
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@end
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@implementation ASIndexedNodeContext {
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std::mutex _lock;
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ASCellNode *_node;
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}
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- (instancetype)initWithNodeBlock:(ASCellNodeBlock)nodeBlock
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indexPath:(NSIndexPath *)indexPath
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supplementaryElementKind:(nullable NSString *)supplementaryElementKind
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constrainedSize:(ASSizeRange)constrainedSize
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environment:(id<ASEnvironment>)environment
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{
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NSAssert(nodeBlock != nil && indexPath != nil, @"Node block and index path must not be nil");
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self = [super init];
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if (self) {
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_nodeBlock = nodeBlock;
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_indexPath = indexPath;
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_supplementaryElementKind = [supplementaryElementKind copy];
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_constrainedSize = constrainedSize;
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_environment = environment;
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}
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return self;
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}
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- (ASCellNode *)node
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{
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std::lock_guard<std::mutex> l(_lock);
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if (_nodeBlock != nil) {
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ASCellNode *node = _nodeBlock();
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_nodeBlock = nil;
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if (node == nil) {
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ASDisplayNodeFailAssert(@"Node block returned nil node! Index path: %@", _indexPath);
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node = [[ASCellNode alloc] init];
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}
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node.cachedIndexPath = _indexPath;
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node.supplementaryElementKind = _supplementaryElementKind;
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node.owningNode = (ASDisplayNode *)_environment;
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ASEnvironmentStatePropagateDown(node, [_environment environmentTraitCollection]);
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_node = node;
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}
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return _node;
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}
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- (ASCellNode *)nodeIfAllocated
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{
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std::lock_guard<std::mutex> l(_lock);
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return _node;
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}
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+ (NSArray<NSIndexPath *> *)indexPathsFromContexts:(NSArray<ASIndexedNodeContext *> *)contexts
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{
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NSMutableArray *result = [NSMutableArray arrayWithCapacity:contexts.count];
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for (ASIndexedNodeContext *ctx in contexts) {
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[result addObject:ctx.indexPath];
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}
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return result;
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}
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@end
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