f52ec78584
Summary: Pull Request resolved: https://github.com/facebook/yoga/pull/1721 X-link: https://github.com/facebook/react-native/pull/46938 The private internals of how we store styles needed to change a bit to support 3 new keyword values. Right now the only other keyword that can be stored is `auto`. As a result there isn't much fancy logic to support storing this and its just stored as a specific type inside of `StyleValueHandle`. There are only 3 bits for types (8 values), so it is not sustainable to just stuff every keyword in there. So the change writes the keyword as a value with a new `keyword` `Type`. I chose not to put `auto` in there even though it is a keyword since it is a hot path, I did not want to regress perf when I did not need to. I also make a new `StyleSizeValue` class to store size values - so values for `width`, `height`, etc. This way these new keywords are kept specific to sizes and we will not be able to create, for example, a margin: `max-content`. Changelog: [Internal] Reviewed By: NickGerleman Differential Revision: D63927512 fbshipit-source-id: 7285469d37ac4b05226183b56275c77f0c06996c
88 lines
1.7 KiB
C++
88 lines
1.7 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <stdbool.h>
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#include <yoga/YGEnums.h>
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#include <yoga/YGMacros.h>
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/**
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* Float value to represent "undefined" in style values.
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*/
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#ifdef __cplusplus
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#include <limits>
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constexpr float YGUndefined = std::numeric_limits<float>::quiet_NaN();
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#else
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#include <math.h>
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#define YGUndefined NAN
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#endif
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YG_EXTERN_C_BEGIN
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/**
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* Structure used to represent a dimension in a style.
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*/
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typedef struct YGValue {
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float value;
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YGUnit unit;
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} YGValue;
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/**
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* Constant for a dimension of "auto".
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*/
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YG_EXPORT extern const YGValue YGValueAuto;
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/**
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* Constant for a dimension which is not defined.
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*/
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YG_EXPORT extern const YGValue YGValueUndefined;
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/**
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* Constant for a dimension that is zero-length.
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*/
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YG_EXPORT extern const YGValue YGValueZero;
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/**
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* Whether a dimension represented as a float is defined.
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*/
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YG_EXPORT bool YGFloatIsUndefined(float value);
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YG_EXTERN_C_END
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// Equality operators for comparison of YGValue in C++
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#ifdef __cplusplus
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inline bool operator==(const YGValue& lhs, const YGValue& rhs) {
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if (lhs.unit != rhs.unit) {
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return false;
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}
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switch (lhs.unit) {
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case YGUnitUndefined:
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case YGUnitAuto:
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case YGUnitFitContent:
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case YGUnitMaxContent:
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case YGUnitStretch:
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return true;
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case YGUnitPoint:
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case YGUnitPercent:
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return lhs.value == rhs.value;
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}
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return false;
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}
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inline bool operator!=(const YGValue& lhs, const YGValue& rhs) {
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return !(lhs == rhs);
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}
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inline YGValue operator-(const YGValue& value) {
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return {-value.value, value.unit};
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}
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#endif
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