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a58844379c
This provides internal features on _ASAsyncTransaction and ASDisplayNode to facilitate implementing public API that allows clients to choose if they would prefer to block on the completion of unfinished rendering, rather than allow a placeholder state to become visible. The internal features are: -[_ASAsyncTransaction waitUntilComplete] -[ASDisplayNode recursivelyEnsureDisplay] Also provided are two such implementations: -[ASCellNode setNeverShowPlaceholders:], which integrates with both Tables and Collections -[ASViewController setNeverShowPlaceholders:], which should work with Nav and Tab controllers. Lastly, on ASDisplayNode, a new property .shouldBypassEnsureDisplay allows individual node types to exempt themselves from blocking the main thread on their display. By implementing the feature at the ASCellNode level rather than ASTableView & ASCollectionView, developers can retain fine-grained control on display characteristics. For example, certain cell types may be appropriate to display to the user with placeholders, whereas others may not. Follow-up work will include unit tests, revisiting names, and the header locations of definitions.
25 lines
954 B
Objective-C
25 lines
954 B
Objective-C
/* Copyright (c) 2014-present, Facebook, Inc.
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* All rights reserved.
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*
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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 <UIKit/UIKit.h>
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@class _ASAsyncTransaction;
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/// A group of transaction container layers, for which the current transactions are committed together at the end of the next runloop tick.
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@interface _ASAsyncTransactionGroup : NSObject
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/// The main transaction group is scheduled to commit on every tick of the main runloop.
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+ (instancetype)mainTransactionGroup;
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+ (void)commit;
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/// Add a transaction container to be committed.
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/// @param containerLayer A layer containing a transaction to be commited. May or may not be a container layer.
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/// @see ASAsyncTransactionContainer
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- (void)addTransactionContainer:(CALayer *)containerLayer;
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@end
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