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[ASCornerLayoutSpec] New layout spec class for declarative corner ele…
…ment layout. (#657) * Add new layout spec class with snapshot testing. Update examples and CHANGELOG.md * Code review updates. * Open curly bracket in a new line.
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// | ||
// ASCornerLayoutSpec.h | ||
// Texture | ||
// | ||
// Copyright (c) 2017-present, Pinterest, Inc. All rights reserved. | ||
// Licensed under the Apache License, Version 2.0 (the "License"); | ||
// you may not use this file except in compliance with the License. | ||
// You may obtain a copy of the License at | ||
// | ||
// http://www.apache.org/licenses/LICENSE-2.0 | ||
// | ||
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#import <AsyncDisplayKit/ASLayoutSpec.h> | ||
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/** | ||
The corner location for positioning corner element. | ||
*/ | ||
typedef NS_ENUM(NSInteger, ASCornerLayoutLocation) { | ||
ASCornerLayoutLocationTopLeft, | ||
ASCornerLayoutLocationTopRight, | ||
ASCornerLayoutLocationBottomLeft, | ||
ASCornerLayoutLocationBottomRight, | ||
}; | ||
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NS_ASSUME_NONNULL_BEGIN | ||
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/** | ||
A layout spec that positions a corner element which relatives to the child element. | ||
@warning Both child element and corner element must have valid preferredSize for layout calculation. | ||
*/ | ||
@interface ASCornerLayoutSpec : ASLayoutSpec | ||
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/** | ||
A layout spec that positions a corner element which relatives to the child element. | ||
@param child A child that is laid out to determine the size of this spec. | ||
@param corner A layoutElement object that is laid out to a corner on the child. | ||
@param location The corner position option. | ||
@return An ASCornerLayoutSpec object with a given child and an layoutElement that act as corner. | ||
*/ | ||
- (instancetype)initWithChild:(id <ASLayoutElement>)child corner:(id <ASLayoutElement>)corner location:(ASCornerLayoutLocation)location AS_WARN_UNUSED_RESULT; | ||
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/** | ||
A layout spec that positions a corner element which relatives to the child element. | ||
@param child A child that is laid out to determine the size of this spec. | ||
@param corner A layoutElement object that is laid out to a corner on the child. | ||
@param location The corner position option. | ||
@return An ASCornerLayoutSpec object with a given child and an layoutElement that act as corner. | ||
*/ | ||
+ (instancetype)cornerLayoutSpecWithChild:(id <ASLayoutElement>)child corner:(id <ASLayoutElement>)corner location:(ASCornerLayoutLocation)location AS_WARN_UNUSED_RESULT; | ||
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/** | ||
A layoutElement object that is laid out to a corner on the child. | ||
*/ | ||
@property (nonatomic, strong) id <ASLayoutElement> corner; | ||
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/** | ||
The corner position option. | ||
*/ | ||
@property (nonatomic, assign) ASCornerLayoutLocation cornerLocation; | ||
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/** | ||
The point which offsets from the corner location. Use this property to make delta | ||
distance from the default corner location. Default is CGPointZero. | ||
*/ | ||
@property (nonatomic, assign) CGPoint offset; | ||
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/** | ||
Whether should include corner element into layout size calculation. If included, | ||
the layout size will be the union size of both child and corner; If not included, | ||
the layout size will be only child's size. Default is NO. | ||
*/ | ||
@property (nonatomic, assign) BOOL wrapsCorner; | ||
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@end | ||
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NS_ASSUME_NONNULL_END |
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