ASRatioLayoutSpec.h

//
//  ASRatioLayoutSpec.h
//  AsyncDisplayKit
//
//  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/ASLayoutSpec.h>

NS_ASSUME_NONNULL_BEGIN

@protocol ASLayoutElement;

/**
 Ratio layout spec
 For when the content should respect a certain inherent ratio but can be scaled (think photos or videos)
 The ratio passed is the ratio of height / width you expect

 For a ratio 0.5, the spec will have a flat rectangle shape
  _ _ _ _
 |       |
 |_ _ _ _|

 For a ratio 2.0, the spec will be twice as tall as it is wide
  _ _
 |   |
 |   |
 |   |
 |_ _|

 **/
@interface ASRatioLayoutSpec : ASLayoutSpec

@property (nonatomic, assign) CGFloat ratio;

+ (instancetype)ratioLayoutSpecWithRatio:(CGFloat)ratio child:(id<ASLayoutElement>)child AS_WARN_UNUSED_RESULT;

@end

NS_ASSUME_NONNULL_END