/*

* 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/ASRelativeLayoutSpec.h>

/** How the child is centered within the spec. */

typedef NS_OPTIONS(NSUInteger, ASCenterLayoutSpecCenteringOptions) {

/** The child is positioned in {0,0} relatively to the layout bounds */

ASCenterLayoutSpecCenteringNone = 0,

/** The child is centered along the X axis */

ASCenterLayoutSpecCenteringX = 1 << 0,

/** The child is centered along the Y axis */

ASCenterLayoutSpecCenteringY = 1 << 1,

/** Convenience option to center both along the X and Y axis */

ASCenterLayoutSpecCenteringXY = ASCenterLayoutSpecCenteringX | ASCenterLayoutSpecCenteringY

};

/** How much space the spec will take up. */

typedef NS_OPTIONS(NSUInteger, ASCenterLayoutSpecSizingOptions) {

/** The spec will take up the maximum size possible */

ASCenterLayoutSpecSizingOptionDefault = ASRelativeLayoutSpecSizingOptionDefault,

/** The spec will take up the minimum size possible along the X axis */

ASCenterLayoutSpecSizingOptionMinimumX = ASRelativeLayoutSpecSizingOptionMinimumWidth,

/** The spec will take up the minimum size possible along the Y axis */

ASCenterLayoutSpecSizingOptionMinimumY = ASRelativeLayoutSpecSizingOptionMinimumHeight,

/** Convenience option to take up the minimum size along both the X and Y axis */

ASCenterLayoutSpecSizingOptionMinimumXY = ASRelativeLayoutSpecSizingOptionMinimumSize

};

NS_ASSUME_NONNULL_BEGIN

/** Lays out a single layoutable child and position it so that it is centered into the layout bounds.

* NOTE: ASRelativeLayoutSpec offers all of the capabilities of Center, and more.

* Check it out if you would like to be able to position the child at any corner or the middle of an edge.

*/

@interface ASCenterLayoutSpec : ASRelativeLayoutSpec

@property (nonatomic, assign) ASCenterLayoutSpecCenteringOptions centeringOptions;

@property (nonatomic, assign) ASCenterLayoutSpecSizingOptions sizingOptions;

/**

* Initializer.

*

* @param centeringOptions How the child is centered.

*

* @param sizingOptions How much space will be taken up.

*

* @param child The child to center.

*/

+ (instancetype)centerLayoutSpecWithCenteringOptions:(ASCenterLayoutSpecCenteringOptions)centeringOptions

sizingOptions:(ASCenterLayoutSpecSizingOptions)sizingOptions

child:(id<ASLayoutable>)child;

@end

NS_ASSUME_NONNULL_END