//
//  ASPendingStateController.h
//  AsyncDisplayKit
//
//  Created by Adlai Holler on 1/7/16.
//  Copyright © 2016 Facebook. All rights reserved.
//

#import <Foundation/Foundation.h>

@class ASDisplayNode;

NS_ASSUME_NONNULL_BEGIN

/**
 A singleton that is responsible for applying changes to
 UIView/CALayer properties of display nodes when they
 have been set on background threads.
 
 This controller will enqueue run-loop events to flush changes
 but if you need 
 */
@interface ASPendingStateController : NSObject

+ (ASPendingStateController *)sharedInstance;

@property (nonatomic, readonly) BOOL hasChanges;

/**
 Flush all pending states for nodes now. Any UIView/CALayer properties
 that have been set in the background will be applied to their
 corresponding views/layers before this method returns.
 
 You must call this method on the main thread.
 */
- (void)flush;

/**
 Register this node as having pending state that needs
 */
- (void)registerNode:(ASDisplayNode *)node;

@end

NS_ASSUME_NONNULL_END