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[ASCornerLayoutSpec] New layout spec class for declarative corner ele…
…ment layout. (TextureGroup#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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