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64 lines
2.7 KiB
Objective-C
64 lines
2.7 KiB
Objective-C
//
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// ASCenterLayoutSpec.h
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// AsyncDisplayKit
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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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 <AsyncDisplayKit/ASRelativeLayoutSpec.h>
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/** How the child is centered within the spec. */
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typedef NS_OPTIONS(NSUInteger, ASCenterLayoutSpecCenteringOptions) {
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/** The child is positioned in {0,0} relatively to the layout bounds */
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ASCenterLayoutSpecCenteringNone = 0,
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/** The child is centered along the X axis */
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ASCenterLayoutSpecCenteringX = 1 << 0,
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/** The child is centered along the Y axis */
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ASCenterLayoutSpecCenteringY = 1 << 1,
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/** Convenience option to center both along the X and Y axis */
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ASCenterLayoutSpecCenteringXY = ASCenterLayoutSpecCenteringX | ASCenterLayoutSpecCenteringY
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};
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/** How much space the spec will take up. */
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typedef NS_OPTIONS(NSUInteger, ASCenterLayoutSpecSizingOptions) {
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/** The spec will take up the maximum size possible */
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ASCenterLayoutSpecSizingOptionDefault = ASRelativeLayoutSpecSizingOptionDefault,
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/** The spec will take up the minimum size possible along the X axis */
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ASCenterLayoutSpecSizingOptionMinimumX = ASRelativeLayoutSpecSizingOptionMinimumWidth,
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/** The spec will take up the minimum size possible along the Y axis */
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ASCenterLayoutSpecSizingOptionMinimumY = ASRelativeLayoutSpecSizingOptionMinimumHeight,
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/** Convenience option to take up the minimum size along both the X and Y axis */
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ASCenterLayoutSpecSizingOptionMinimumXY = ASRelativeLayoutSpecSizingOptionMinimumSize
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};
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NS_ASSUME_NONNULL_BEGIN
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/** Lays out a single layoutable child and position it so that it is centered into the layout bounds.
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* NOTE: ASRelativeLayoutSpec offers all of the capabilities of Center, and more.
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* Check it out if you would like to be able to position the child at any corner or the middle of an edge.
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*/
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@interface ASCenterLayoutSpec : ASRelativeLayoutSpec
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@property (nonatomic, assign) ASCenterLayoutSpecCenteringOptions centeringOptions;
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@property (nonatomic, assign) ASCenterLayoutSpecSizingOptions sizingOptions;
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/**
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* Initializer.
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*
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* @param centeringOptions How the child is centered.
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*
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* @param sizingOptions How much space will be taken up.
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*
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* @param child The child to center.
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*/
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+ (instancetype)centerLayoutSpecWithCenteringOptions:(ASCenterLayoutSpecCenteringOptions)centeringOptions
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sizingOptions:(ASCenterLayoutSpecSizingOptions)sizingOptions
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child:(id<ASLayoutable>)child;
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@end
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NS_ASSUME_NONNULL_END
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