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65 lines
2.2 KiB
Objective-C
65 lines
2.2 KiB
Objective-C
//
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// ASDisplayNodeLayout.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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#pragma once
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#import <AsyncDisplayKit/ASDimension.h>
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@class ASLayout;
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/*
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* Represents a connection between an ASLayout and a ASDisplayNode
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* ASDisplayNode uses this to store additional information that are necessary besides the layout
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*/
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struct ASDisplayNodeLayout {
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ASLayout *layout;
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ASSizeRange constrainedSize;
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CGSize parentSize;
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BOOL requestedLayoutFromAbove;
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BOOL _dirty;
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/*
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* Create a new display node layout with
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* @param layout The layout to associate, usually returned from a call to -layoutThatFits:parentSize:
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* @param constrainedSize Constrained size used to create the layout
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* @param parentSize Parent size used to create the layout
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*/
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ASDisplayNodeLayout(ASLayout *layout, ASSizeRange constrainedSize, CGSize parentSize)
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: layout(layout), constrainedSize(constrainedSize), parentSize(parentSize), requestedLayoutFromAbove(NO), _dirty(NO) {};
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/*
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* Creates a layout without any layout associated. By default this display node layout is dirty.
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*/
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ASDisplayNodeLayout()
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: layout(nil), constrainedSize({{0, 0}, {0, 0}}), parentSize({0, 0}), requestedLayoutFromAbove(NO), _dirty(YES) {};
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/**
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* Returns if the display node layout is dirty as it was invalidated or it was created without a layout.
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*/
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BOOL isDirty();
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/**
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* Returns if ASDisplayNode is still valid for a given constrained and parent size
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*/
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BOOL isValidForConstrainedSizeParentSize(ASSizeRange constrainedSize, CGSize parentSize);
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/**
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* Invalidate the display node layout
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*/
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void invalidate();
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};
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