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ASContextTransitioning.h
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//
// ASContextTransitioning.h
// AsyncDisplayKit
//
// Created by Levi McCallum on 2/4/16.
//
// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
#import <AsyncDisplayKit/ASDimension.h>
@class ASDisplayNode;
@class ASLayout;
NS_ASSUME_NONNULL_BEGIN
extern NSString * const ASTransitionContextFromLayoutKey;
extern NSString * const ASTransitionContextToLayoutKey;
@protocol ASContextTransitioning <NSObject>
/**
@abstract Defines if the given transition is animated
*/
- (BOOL)isAnimated;
/**
* @abstract Retrieve either the "from" or "to" layout
*/
- (nullable ASLayout *)layoutForKey:(NSString *)key;
/**
* @abstract Retrieve either the "from" or "to" constrainedSize
*/
- (ASSizeRange)constrainedSizeForKey:(NSString *)key;
/**
* @abstract Retrieve the subnodes from either the "from" or "to" layout
*/
- (NSArray<ASDisplayNode *> *)subnodesForKey:(NSString *)key;
/**
* @abstract Subnodes that have been inserted in the layout transition
*/
- (NSArray<ASDisplayNode *> *)insertedSubnodes;
/**
* @abstract Subnodes that will be removed in the layout transition
*/
- (NSArray<ASDisplayNode *> *)removedSubnodes;
/**
@abstract The frame for the given node before the transition began.
@discussion Returns CGRectNull if the node was not in the hierarchy before the transition.
*/
- (CGRect)initialFrameForNode:(ASDisplayNode *)node;
/**
@abstract The frame for the given node when the transition completes.
@discussion Returns CGRectNull if the node is no longer in the hierarchy after the transition.
*/
- (CGRect)finalFrameForNode:(ASDisplayNode *)node;
/**
@abstract Invoke this method when the transition is completed in `animateLayoutTransition:`
@discussion Passing NO to `didComplete` will set the original layout as the new layout.
*/
- (void)completeTransition:(BOOL)didComplete;
@end
NS_ASSUME_NONNULL_END