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46 lines
1.7 KiB
Objective-C
46 lines
1.7 KiB
Objective-C
//
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// ASInsetLayoutSpec.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/ASAvailability.h>
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#import <AsyncDisplayKit/ASLayoutSpec.h>
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NS_ASSUME_NONNULL_BEGIN
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/**
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A layout spec that wraps another layoutElement child, applying insets around it.
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If the child has a size specified as a fraction, the fraction is resolved against this spec's parent
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size **after** applying insets.
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@example ASOuterLayoutSpec contains an ASInsetLayoutSpec with an ASInnerLayoutSpec. Suppose that:
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- ASOuterLayoutSpec is 200pt wide.
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- ASInnerLayoutSpec specifies its width as 100%.
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- The ASInsetLayoutSpec has insets of 10pt on every side.
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ASInnerLayoutSpec will have size 180pt, not 200pt, because it receives a parent size that has been adjusted for insets.
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If you're familiar with CSS: ASInsetLayoutSpec's child behaves similarly to "box-sizing: border-box".
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An infinite inset is resolved as an inset equal to all remaining space after applying the other insets and child size.
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@example An ASInsetLayoutSpec with an infinite left inset and 10px for all other edges will position it's child 10px from the right edge.
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*/
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@interface ASInsetLayoutSpec : ASLayoutSpec
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@property (nonatomic, assign) UIEdgeInsets insets;
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/**
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@param insets The amount of space to inset on each side.
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@param child The wrapped child to inset.
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*/
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+ (instancetype)insetLayoutSpecWithInsets:(UIEdgeInsets)insets child:(id<ASLayoutElement>)child AS_WARN_UNUSED_RESULT;
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@end
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NS_ASSUME_NONNULL_END
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