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96 lines
4.5 KiB
Objective-C
96 lines
4.5 KiB
Objective-C
//
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// ASRelativeLayoutSpec.h
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// Texture
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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 /ASDK-Licenses directory of this source tree. An additional
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// grant of patent rights can be found in the PATENTS file in the same directory.
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//
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// Modifications to this file made after 4/13/2017 are: Copyright (c) 2017-present,
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// Pinterest, Inc. Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <AsyncDisplayKit/ASLayoutSpec.h>
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/**
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* How the child is positioned within the spec.
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*
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* The default option will position the child at point 0.
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* Swift: use [] for the default behavior.
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*/
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typedef NS_ENUM(NSUInteger, ASRelativeLayoutSpecPosition) {
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/** The child is positioned at point 0 */
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ASRelativeLayoutSpecPositionNone = 0,
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/** The child is positioned at point 0 relatively to the layout axis (ie left / top most) */
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ASRelativeLayoutSpecPositionStart = 1,
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/** The child is centered along the specified axis */
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ASRelativeLayoutSpecPositionCenter = 2,
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/** The child is positioned at the maximum point of the layout axis (ie right / bottom most) */
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ASRelativeLayoutSpecPositionEnd = 3,
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};
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/**
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* How much space the spec will take up.
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*
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* The default option will allow the spec to take up the maximum size possible.
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* Swift: use [] for the default behavior.
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*/
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typedef NS_OPTIONS(NSUInteger, ASRelativeLayoutSpecSizingOption) {
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/** The spec will take up the maximum size possible */
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ASRelativeLayoutSpecSizingOptionDefault,
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/** The spec will take up the minimum size possible along the X axis */
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ASRelativeLayoutSpecSizingOptionMinimumWidth = 1 << 0,
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/** The spec will take up the minimum size possible along the Y axis */
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ASRelativeLayoutSpecSizingOptionMinimumHeight = 1 << 1,
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/** Convenience option to take up the minimum size along both the X and Y axis */
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ASRelativeLayoutSpecSizingOptionMinimumSize = ASRelativeLayoutSpecSizingOptionMinimumWidth | ASRelativeLayoutSpecSizingOptionMinimumHeight,
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};
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NS_ASSUME_NONNULL_BEGIN
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/** Lays out a single layoutElement child and positions it within the layout bounds according to vertical and horizontal positional specifiers.
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* Can position the child at any of the 4 corners, or the middle of any of the 4 edges, as well as the center - similar to "9-part" image areas.
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*/
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@interface ASRelativeLayoutSpec : ASLayoutSpec
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// You may create a spec with alloc / init, then set any non-default properties; or use a convenience initialize that accepts all properties.
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@property (nonatomic, assign) ASRelativeLayoutSpecPosition horizontalPosition;
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@property (nonatomic, assign) ASRelativeLayoutSpecPosition verticalPosition;
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@property (nonatomic, assign) ASRelativeLayoutSpecSizingOption sizingOption;
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/*!
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* @discussion convenience constructor for a ASRelativeLayoutSpec
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* @param horizontalPosition how to position the item on the horizontal (x) axis
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* @param verticalPosition how to position the item on the vertical (y) axis
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* @param sizingOption how much size to take up
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* @param child the child to layout
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* @return a configured ASRelativeLayoutSpec
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*/
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+ (instancetype)relativePositionLayoutSpecWithHorizontalPosition:(ASRelativeLayoutSpecPosition)horizontalPosition
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verticalPosition:(ASRelativeLayoutSpecPosition)verticalPosition
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sizingOption:(ASRelativeLayoutSpecSizingOption)sizingOption
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child:(id<ASLayoutElement>)child AS_WARN_UNUSED_RESULT;
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/*!
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* @discussion convenience initializer for a ASRelativeLayoutSpec
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* @param horizontalPosition how to position the item on the horizontal (x) axis
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* @param verticalPosition how to position the item on the vertical (y) axis
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* @param sizingOption how much size to take up
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* @param child the child to layout
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* @return a configured ASRelativeLayoutSpec
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*/
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- (instancetype)initWithHorizontalPosition:(ASRelativeLayoutSpecPosition)horizontalPosition
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verticalPosition:(ASRelativeLayoutSpecPosition)verticalPosition
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sizingOption:(ASRelativeLayoutSpecSizingOption)sizingOption
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child:(id<ASLayoutElement>)child;
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@end
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NS_ASSUME_NONNULL_END
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