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Use a sentinel NSUInteger for node layout data #trivial (#428)

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* Use a sentinel NSUInteger for node layout data

* Add a comment

* Address feedback from @appleguy
This commit is contained in:
Adlai Holler
2017-07-10 05:10:04 -07:00
committed by Huy Nguyen
parent bc361caf5e
commit 1fa498873e
5 changed files with 31 additions and 54 deletions
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23
Source/Private/ASDisplayNodeLayout.h
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@@ -30,35 +30,26 @@ struct ASDisplayNodeLayout {
ASSizeRange constrainedSize;
CGSize parentSize;
BOOL requestedLayoutFromAbove;
BOOL _dirty;
NSUInteger version;
/*
* Create a new display node layout with
* @param layout The layout to associate, usually returned from a call to -layoutThatFits:parentSize:
* @param constrainedSize Constrained size used to create the layout
* @param parentSize Parent size used to create the layout
* @param version The version of the source layout data – see ASDisplayNode's _layoutVersion.
*/
ASDisplayNodeLayout(ASLayout *layout, ASSizeRange constrainedSize, CGSize parentSize)
: layout(layout), constrainedSize(constrainedSize), parentSize(parentSize), requestedLayoutFromAbove(NO), _dirty(NO) {};
ASDisplayNodeLayout(ASLayout *layout, ASSizeRange constrainedSize, CGSize parentSize, NSUInteger version)
: layout(layout), constrainedSize(constrainedSize), parentSize(parentSize), requestedLayoutFromAbove(NO), version(version) {};
/*
* Creates a layout without any layout associated. By default this display node layout is dirty.
*/
ASDisplayNodeLayout()
: layout(nil), constrainedSize({{0, 0}, {0, 0}}), parentSize({0, 0}), requestedLayoutFromAbove(NO), _dirty(YES) {};
: layout(nil), constrainedSize({{0, 0}, {0, 0}}), parentSize({0, 0}), requestedLayoutFromAbove(NO), version(0) {};
/**
* Returns if the display node layout is dirty as it was invalidated or it was created without a layout.
* Returns whether this is valid for a given constrained size, parent size, and version
*/
BOOL isDirty();
/**
* Returns if ASDisplayNode is still valid for a given constrained and parent size
*/
BOOL isValidForConstrainedSizeParentSize(ASSizeRange constrainedSize, CGSize parentSize);
/**
* Invalidate the display node layout
*/
void invalidate();
BOOL isValid(ASSizeRange constrainedSize, CGSize parentSize, NSUInteger version);
};