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Yoga.cpp
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Yoga.cpp
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/**
* Copyright (c) 2014-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#include "Yoga.h"
#include <string.h>
#include <algorithm>
#include "Utils.h"
#include "YGNode.h"
#include "YGNodePrint.h"
#include "Yoga-internal.h"
#ifdef _MSC_VER
#include <float.h>
/* define fmaxf if < VC12 */
#if _MSC_VER < 1800
__forceinline const float fmaxf(const float a, const float b) {
return (a > b) ? a : b;
}
#endif
#endif
#ifdef ANDROID
static int YGAndroidLog(const YGConfigRef config,
const YGNodeRef node,
YGLogLevel level,
const char *format,
va_list args);
#else
static int YGDefaultLog(const YGConfigRef config,
const YGNodeRef node,
YGLogLevel level,
const char *format,
va_list args);
#endif
static YGConfig gYGConfigDefaults = {
.experimentalFeatures =
{
[YGExperimentalFeatureWebFlexBasis] = false,
},
.useWebDefaults = false,
.useLegacyStretchBehaviour = false,
.pointScaleFactor = 1.0f,
#ifdef ANDROID
.logger = &YGAndroidLog,
#else
.logger = &YGDefaultLog,
#endif
.cloneNodeCallback = nullptr,
.context = nullptr,
};
const YGValue YGValueZero = {.value = 0, .unit = YGUnitPoint};
const YGValue YGValueUndefined = {YGUndefined, YGUnitUndefined};
const YGValue YGValueAuto = {YGUndefined, YGUnitAuto};
#ifdef ANDROID
#include <android/log.h>
static int YGAndroidLog(const YGConfigRef config,
const YGNodeRef node,
YGLogLevel level,
const char *format,
va_list args) {
int androidLevel = YGLogLevelDebug;
switch (level) {
case YGLogLevelFatal:
androidLevel = ANDROID_LOG_FATAL;
break;
case YGLogLevelError:
androidLevel = ANDROID_LOG_ERROR;
break;
case YGLogLevelWarn:
androidLevel = ANDROID_LOG_WARN;
break;
case YGLogLevelInfo:
androidLevel = ANDROID_LOG_INFO;
break;
case YGLogLevelDebug:
androidLevel = ANDROID_LOG_DEBUG;
break;
case YGLogLevelVerbose:
androidLevel = ANDROID_LOG_VERBOSE;
break;
}
const int result = __android_log_vprint(androidLevel, "yoga", format, args);
return result;
}
#else
#define YG_UNUSED(x) (void)(x);
static int YGDefaultLog(const YGConfigRef config,
const YGNodeRef node,
YGLogLevel level,
const char *format,
va_list args) {
YG_UNUSED(config);
YG_UNUSED(node);
switch (level) {
case YGLogLevelError:
case YGLogLevelFatal:
return vfprintf(stderr, format, args);
case YGLogLevelWarn:
case YGLogLevelInfo:
case YGLogLevelDebug:
case YGLogLevelVerbose:
default:
return vprintf(format, args);
}
}
#undef YG_UNUSED
#endif
bool YGFloatIsUndefined(const float value) {
return std::isnan(value);
}
const YGValue* YGComputedEdgeValue(
const std::array<YGValue, YGEdgeCount>& edges,
const YGEdge edge,
const YGValue* const defaultValue) {
if (edges[edge].unit != YGUnitUndefined) {
return &edges[edge];
}
if ((edge == YGEdgeTop || edge == YGEdgeBottom) &&
edges[YGEdgeVertical].unit != YGUnitUndefined) {
return &edges[YGEdgeVertical];
}
if ((edge == YGEdgeLeft || edge == YGEdgeRight || edge == YGEdgeStart || edge == YGEdgeEnd) &&
edges[YGEdgeHorizontal].unit != YGUnitUndefined) {
return &edges[YGEdgeHorizontal];
}
if (edges[YGEdgeAll].unit != YGUnitUndefined) {
return &edges[YGEdgeAll];
}
if (edge == YGEdgeStart || edge == YGEdgeEnd) {
return &YGValueUndefined;
}
return defaultValue;
}
void* YGNodeGetContext(YGNodeRef node) {
return node->getContext();
}
void YGNodeSetContext(YGNodeRef node, void* context) {
return node->setContext(context);
}
YGMeasureFunc YGNodeGetMeasureFunc(YGNodeRef node) {
return node->getMeasure();
}
void YGNodeSetMeasureFunc(YGNodeRef node, YGMeasureFunc measureFunc) {
node->setMeasureFunc(measureFunc);
}
YGBaselineFunc YGNodeGetBaselineFunc(YGNodeRef node) {
return node->getBaseline();
}
void YGNodeSetBaselineFunc(YGNodeRef node, YGBaselineFunc baselineFunc) {
node->setBaseLineFunc(baselineFunc);
}
YGPrintFunc YGNodeGetPrintFunc(YGNodeRef node) {
return node->getPrintFunc();
}
void YGNodeSetPrintFunc(YGNodeRef node, YGPrintFunc printFunc) {
node->setPrintFunc(printFunc);
}
bool YGNodeGetHasNewLayout(YGNodeRef node) {
return node->getHasNewLayout();
}
void YGNodeSetHasNewLayout(YGNodeRef node, bool hasNewLayout) {
node->setHasNewLayout(hasNewLayout);
}
YGNodeType YGNodeGetNodeType(YGNodeRef node) {
return node->getNodeType();
}
void YGNodeSetNodeType(YGNodeRef node, YGNodeType nodeType) {
return node->setNodeType(nodeType);
}
bool YGNodeIsDirty(YGNodeRef node) {
return node->isDirty();
}
int32_t gNodeInstanceCount = 0;
int32_t gConfigInstanceCount = 0;
WIN_EXPORT YGNodeRef YGNodeNewWithConfig(const YGConfigRef config) {
const YGNodeRef node = new YGNode();
YGAssertWithConfig(
config, node != nullptr, "Could not allocate memory for node");
gNodeInstanceCount++;
if (config->useWebDefaults) {
node->setStyleFlexDirection(YGFlexDirectionRow);
node->setStyleAlignContent(YGAlignStretch);
}
node->setConfig(config);
return node;
}
YGNodeRef YGNodeNew(void) {
return YGNodeNewWithConfig(&gYGConfigDefaults);
}
YGNodeRef YGNodeClone(YGNodeRef oldNode) {
YGNodeRef node = new YGNode(*oldNode);
YGAssertWithConfig(
oldNode->getConfig(),
node != nullptr,
"Could not allocate memory for node");
gNodeInstanceCount++;
node->setParent(nullptr);
return node;
}
void YGNodeFree(const YGNodeRef node) {
if (node->getParent()) {
node->getParent()->removeChild(node);
node->setParent(nullptr);
}
const uint32_t childCount = YGNodeGetChildCount(node);
for (uint32_t i = 0; i < childCount; i++) {
const YGNodeRef child = YGNodeGetChild(node, i);
child->setParent(nullptr);
}
node->clearChildren();
free(node);
gNodeInstanceCount--;
}
void YGNodeFreeRecursive(const YGNodeRef root) {
while (YGNodeGetChildCount(root) > 0) {
const YGNodeRef child = YGNodeGetChild(root, 0);
if (child->getParent() != root) {
// Don't free shared nodes that we don't own.
break;
}
YGNodeRemoveChild(root, child);
YGNodeFreeRecursive(child);
}
YGNodeFree(root);
}
void YGNodeReset(const YGNodeRef node) {
YGAssertWithNode(node,
YGNodeGetChildCount(node) == 0,
"Cannot reset a node which still has children attached");
YGAssertWithNode(
node,
node->getParent() == nullptr,
"Cannot reset a node still attached to a parent");
node->clearChildren();
const YGConfigRef config = node->getConfig();
*node = YGNode();
if (config->useWebDefaults) {
node->setStyleFlexDirection(YGFlexDirectionRow);
node->setStyleAlignContent(YGAlignStretch);
}
node->setConfig(config);
}
int32_t YGNodeGetInstanceCount(void) {
return gNodeInstanceCount;
}
int32_t YGConfigGetInstanceCount(void) {
return gConfigInstanceCount;
}
// Export only for C#
YGConfigRef YGConfigGetDefault() {
return &gYGConfigDefaults;
}
YGConfigRef YGConfigNew(void) {
const YGConfigRef config = (const YGConfigRef)malloc(sizeof(YGConfig));
YGAssert(config != nullptr, "Could not allocate memory for config");
if (config == nullptr) {
abort();
}
gConfigInstanceCount++;
memcpy(config, &gYGConfigDefaults, sizeof(YGConfig));
return config;
}
void YGConfigFree(const YGConfigRef config) {
free(config);
gConfigInstanceCount--;
}
void YGConfigCopy(const YGConfigRef dest, const YGConfigRef src) {
memcpy(dest, src, sizeof(YGConfig));
}
void YGNodeInsertChild(const YGNodeRef node, const YGNodeRef child, const uint32_t index) {
YGAssertWithNode(
node,
child->getParent() == nullptr,
"Child already has a parent, it must be removed first.");
YGAssertWithNode(
node,
node->getMeasure() == nullptr,
"Cannot add child: Nodes with measure functions cannot have children.");
node->cloneChildrenIfNeeded();
node->insertChild(child, index);
child->setParent(node);
node->markDirtyAndPropogate();
}
void YGNodeRemoveChild(const YGNodeRef parent, const YGNodeRef excludedChild) {
// This algorithm is a forked variant from cloneChildrenIfNeeded in YGNode
// that excludes a child.
const uint32_t childCount = YGNodeGetChildCount(parent);
if (childCount == 0) {
// This is an empty set. Nothing to remove.
return;
}
const YGNodeRef firstChild = YGNodeGetChild(parent, 0);
if (firstChild->getParent() == parent) {
// If the first child has this node as its parent, we assume that it is already unique.
// We can now try to delete a child in this list.
if (parent->removeChild(excludedChild)) {
excludedChild->setLayout(
YGNode().getLayout()); // layout is no longer valid
excludedChild->setParent(nullptr);
parent->markDirtyAndPropogate();
}
return;
}
// Otherwise we have to clone the node list except for the child we're trying to delete.
// We don't want to simply clone all children, because then the host will need to free
// the clone of the child that was just deleted.
const YGNodeClonedFunc cloneNodeCallback =
parent->getConfig()->cloneNodeCallback;
uint32_t nextInsertIndex = 0;
for (uint32_t i = 0; i < childCount; i++) {
const YGNodeRef oldChild = parent->getChild(i);
if (excludedChild == oldChild) {
// Ignore the deleted child. Don't reset its layout or parent since it is still valid
// in the other parent. However, since this parent has now changed, we need to mark it
// as dirty.
parent->markDirtyAndPropogate();
continue;
}
const YGNodeRef newChild = YGNodeClone(oldChild);
parent->replaceChild(newChild, nextInsertIndex);
newChild->setParent(parent);
if (cloneNodeCallback) {
cloneNodeCallback(oldChild, newChild, parent, nextInsertIndex);
}
nextInsertIndex++;
}
while (nextInsertIndex < childCount) {
parent->removeChild(nextInsertIndex);
nextInsertIndex++;
}
}
void YGNodeRemoveAllChildren(const YGNodeRef parent) {
const uint32_t childCount = YGNodeGetChildCount(parent);
if (childCount == 0) {
// This is an empty set already. Nothing to do.
return;
}
const YGNodeRef firstChild = YGNodeGetChild(parent, 0);
if (firstChild->getParent() == parent) {
// If the first child has this node as its parent, we assume that this child set is unique.
for (uint32_t i = 0; i < childCount; i++) {
const YGNodeRef oldChild = YGNodeGetChild(parent, i);
oldChild->setLayout(YGNode().getLayout()); // layout is no longer valid
oldChild->setParent(nullptr);
}
parent->clearChildren();
parent->markDirtyAndPropogate();
return;
}
// Otherwise, we are not the owner of the child set. We don't have to do anything to clear it.
parent->setChildren(YGVector());
parent->markDirtyAndPropogate();
}
YGNodeRef YGNodeGetChild(const YGNodeRef node, const uint32_t index) {
if (index < node->getChildren().size()) {
return node->getChild(index);
}
return nullptr;
}
uint32_t YGNodeGetChildCount(const YGNodeRef node) {
return static_cast<uint32_t>(node->getChildren().size());
}
YGNodeRef YGNodeGetParent(const YGNodeRef node) {
return node->getParent();
}
void YGNodeMarkDirty(const YGNodeRef node) {
YGAssertWithNode(
node,
node->getMeasure() != nullptr,
"Only leaf nodes with custom measure functions"
"should manually mark themselves as dirty");
node->markDirtyAndPropogate();
}
void YGNodeCopyStyle(const YGNodeRef dstNode, const YGNodeRef srcNode) {
if (!(dstNode->getStyle() == srcNode->getStyle())) {
dstNode->setStyle(srcNode->getStyle());
dstNode->markDirtyAndPropogate();
}
}
float YGNodeStyleGetFlexGrow(const YGNodeRef node) {
return YGFloatIsUndefined(node->getStyle().flexGrow)
? kDefaultFlexGrow
: node->getStyle().flexGrow;
}
float YGNodeStyleGetFlexShrink(const YGNodeRef node) {
return YGFloatIsUndefined(node->getStyle().flexShrink)
? (node->getConfig()->useWebDefaults ? kWebDefaultFlexShrink
: kDefaultFlexShrink)
: node->getStyle().flexShrink;
}
#define YG_NODE_STYLE_PROPERTY_SETTER_IMPL( \
type, name, paramName, instanceName) \
void YGNodeStyleSet##name(const YGNodeRef node, const type paramName) { \
if (node->getStyle().instanceName != paramName) { \
YGStyle style = node->getStyle(); \
style.instanceName = paramName; \
node->setStyle(style); \
node->markDirtyAndPropogate(); \
} \
}
#define YG_NODE_STYLE_PROPERTY_SETTER_UNIT_IMPL( \
type, name, paramName, instanceName) \
void YGNodeStyleSet##name(const YGNodeRef node, const type paramName) { \
YGValue value = { \
.value = paramName, \
.unit = YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPoint, \
}; \
if ((node->getStyle().instanceName.value != value.value && \
value.unit != YGUnitUndefined) || \
node->getStyle().instanceName.unit != value.unit) { \
YGStyle style = node->getStyle(); \
style.instanceName = value; \
node->setStyle(style); \
node->markDirtyAndPropogate(); \
} \
} \
\
void YGNodeStyleSet##name##Percent( \
const YGNodeRef node, const type paramName) { \
YGValue value = { \
.value = paramName, \
.unit = \
YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPercent, \
}; \
if ((node->getStyle().instanceName.value != value.value && \
value.unit != YGUnitUndefined) || \
node->getStyle().instanceName.unit != value.unit) { \
YGStyle style = node->getStyle(); \
\
style.instanceName = value; \
node->setStyle(style); \
node->markDirtyAndPropogate(); \
} \
}
#define YG_NODE_STYLE_PROPERTY_SETTER_UNIT_AUTO_IMPL( \
type, name, paramName, instanceName) \
void YGNodeStyleSet##name(const YGNodeRef node, const type paramName) { \
YGValue value = { \
.value = paramName, \
.unit = YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPoint, \
}; \
if ((node->getStyle().instanceName.value != value.value && \
value.unit != YGUnitUndefined) || \
node->getStyle().instanceName.unit != value.unit) { \
YGStyle style = node->getStyle(); \
style.instanceName = value; \
node->setStyle(style); \
node->markDirtyAndPropogate(); \
} \
} \
\
void YGNodeStyleSet##name##Percent( \
const YGNodeRef node, const type paramName) { \
if (node->getStyle().instanceName.value != paramName || \
node->getStyle().instanceName.unit != YGUnitPercent) { \
YGStyle style = node->getStyle(); \
style.instanceName.value = paramName; \
style.instanceName.unit = \
YGFloatIsUndefined(paramName) ? YGUnitAuto : YGUnitPercent; \
node->setStyle(style); \
node->markDirtyAndPropogate(); \
} \
} \
\
void YGNodeStyleSet##name##Auto(const YGNodeRef node) { \
if (node->getStyle().instanceName.unit != YGUnitAuto) { \
YGStyle style = node->getStyle(); \
style.instanceName.value = YGUndefined; \
style.instanceName.unit = YGUnitAuto; \
node->setStyle(style); \
node->markDirtyAndPropogate(); \
} \
}
#define YG_NODE_STYLE_PROPERTY_IMPL(type, name, paramName, instanceName) \
YG_NODE_STYLE_PROPERTY_SETTER_IMPL(type, name, paramName, instanceName) \
\
type YGNodeStyleGet##name(const YGNodeRef node) { \
return node->getStyle().instanceName; \
}
#define YG_NODE_STYLE_PROPERTY_UNIT_IMPL(type, name, paramName, instanceName) \
YG_NODE_STYLE_PROPERTY_SETTER_UNIT_IMPL( \
float, name, paramName, instanceName) \
\
type YGNodeStyleGet##name(const YGNodeRef node) { \
return node->getStyle().instanceName; \
}
#define YG_NODE_STYLE_PROPERTY_UNIT_AUTO_IMPL( \
type, name, paramName, instanceName) \
YG_NODE_STYLE_PROPERTY_SETTER_UNIT_AUTO_IMPL( \
float, name, paramName, instanceName) \
\
type YGNodeStyleGet##name(const YGNodeRef node) { \
return node->getStyle().instanceName; \
}
#define YG_NODE_STYLE_EDGE_PROPERTY_UNIT_AUTO_IMPL(type, name, instanceName) \
void YGNodeStyleSet##name##Auto(const YGNodeRef node, const YGEdge edge) { \
if (node->getStyle().instanceName[edge].unit != YGUnitAuto) { \
YGStyle style = node->getStyle(); \
style.instanceName[edge].value = YGUndefined; \
style.instanceName[edge].unit = YGUnitAuto; \
node->setStyle(style); \
node->markDirtyAndPropogate(); \
} \
}
#define YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL( \
type, name, paramName, instanceName) \
void YGNodeStyleSet##name( \
const YGNodeRef node, const YGEdge edge, const float paramName) { \
YGValue value = { \
.value = paramName, \
.unit = YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPoint, \
}; \
if ((node->getStyle().instanceName[edge].value != value.value && \
value.unit != YGUnitUndefined) || \
node->getStyle().instanceName[edge].unit != value.unit) { \
YGStyle style = node->getStyle(); \
style.instanceName[edge] = value; \
node->setStyle(style); \
node->markDirtyAndPropogate(); \
} \
} \
\
void YGNodeStyleSet##name##Percent( \
const YGNodeRef node, const YGEdge edge, const float paramName) { \
YGValue value = { \
.value = paramName, \
.unit = \
YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPercent, \
}; \
if ((node->getStyle().instanceName[edge].value != value.value && \
value.unit != YGUnitUndefined) || \
node->getStyle().instanceName[edge].unit != value.unit) { \
YGStyle style = node->getStyle(); \
style.instanceName[edge] = value; \
node->setStyle(style); \
node->markDirtyAndPropogate(); \
} \
} \
\
WIN_STRUCT(type) \
YGNodeStyleGet##name(const YGNodeRef node, const YGEdge edge) { \
return WIN_STRUCT_REF(node->getStyle().instanceName[edge]); \
}
#define YG_NODE_STYLE_EDGE_PROPERTY_IMPL(type, name, paramName, instanceName) \
void YGNodeStyleSet##name( \
const YGNodeRef node, const YGEdge edge, const float paramName) { \
YGValue value = { \
.value = paramName, \
.unit = YGFloatIsUndefined(paramName) ? YGUnitUndefined : YGUnitPoint, \
}; \
if ((node->getStyle().instanceName[edge].value != value.value && \
value.unit != YGUnitUndefined) || \
node->getStyle().instanceName[edge].unit != value.unit) { \
YGStyle style = node->getStyle(); \
style.instanceName[edge] = value; \
node->setStyle(style); \
node->markDirtyAndPropogate(); \
} \
} \
\
float YGNodeStyleGet##name(const YGNodeRef node, const YGEdge edge) { \
return node->getStyle().instanceName[edge].value; \
}
#define YG_NODE_LAYOUT_PROPERTY_IMPL(type, name, instanceName) \
type YGNodeLayoutGet##name(const YGNodeRef node) { \
return node->getLayout().instanceName; \
}
#define YG_NODE_LAYOUT_RESOLVED_PROPERTY_IMPL(type, name, instanceName) \
type YGNodeLayoutGet##name(const YGNodeRef node, const YGEdge edge) { \
YGAssertWithNode( \
node, \
edge <= YGEdgeEnd, \
"Cannot get layout properties of multi-edge shorthands"); \
\
if (edge == YGEdgeLeft) { \
if (node->getLayout().direction == YGDirectionRTL) { \
return node->getLayout().instanceName[YGEdgeEnd]; \
} else { \
return node->getLayout().instanceName[YGEdgeStart]; \
} \
} \
\
if (edge == YGEdgeRight) { \
if (node->getLayout().direction == YGDirectionRTL) { \
return node->getLayout().instanceName[YGEdgeStart]; \
} else { \
return node->getLayout().instanceName[YGEdgeEnd]; \
} \
} \
\
return node->getLayout().instanceName[edge]; \
}
// YG_NODE_PROPERTY_IMPL(void *, Context, context, context);
// YG_NODE_PROPERTY_IMPL(YGPrintFunc, PrintFunc, printFunc, print);
// YG_NODE_PROPERTY_IMPL(bool, HasNewLayout, hasNewLayout, hasNewLayout);
// YG_NODE_PROPERTY_IMPL(YGNodeType, NodeType, nodeType, nodeType);
YG_NODE_STYLE_PROPERTY_IMPL(YGDirection, Direction, direction, direction);
YG_NODE_STYLE_PROPERTY_IMPL(YGFlexDirection, FlexDirection, flexDirection, flexDirection);
YG_NODE_STYLE_PROPERTY_IMPL(YGJustify, JustifyContent, justifyContent, justifyContent);
YG_NODE_STYLE_PROPERTY_IMPL(YGAlign, AlignContent, alignContent, alignContent);
YG_NODE_STYLE_PROPERTY_IMPL(YGAlign, AlignItems, alignItems, alignItems);
YG_NODE_STYLE_PROPERTY_IMPL(YGAlign, AlignSelf, alignSelf, alignSelf);
YG_NODE_STYLE_PROPERTY_IMPL(YGPositionType, PositionType, positionType, positionType);
YG_NODE_STYLE_PROPERTY_IMPL(YGWrap, FlexWrap, flexWrap, flexWrap);
YG_NODE_STYLE_PROPERTY_IMPL(YGOverflow, Overflow, overflow, overflow);
YG_NODE_STYLE_PROPERTY_IMPL(YGDisplay, Display, display, display);
YG_NODE_STYLE_PROPERTY_IMPL(float, Flex, flex, flex);
YG_NODE_STYLE_PROPERTY_SETTER_IMPL(float, FlexGrow, flexGrow, flexGrow);
YG_NODE_STYLE_PROPERTY_SETTER_IMPL(float, FlexShrink, flexShrink, flexShrink);
YG_NODE_STYLE_PROPERTY_UNIT_AUTO_IMPL(YGValue, FlexBasis, flexBasis, flexBasis);
YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL(YGValue, Position, position, position);
YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL(YGValue, Margin, margin, margin);
YG_NODE_STYLE_EDGE_PROPERTY_UNIT_AUTO_IMPL(YGValue, Margin, margin);
YG_NODE_STYLE_EDGE_PROPERTY_UNIT_IMPL(YGValue, Padding, padding, padding);
YG_NODE_STYLE_EDGE_PROPERTY_IMPL(float, Border, border, border);
YG_NODE_STYLE_PROPERTY_UNIT_AUTO_IMPL(YGValue, Width, width, dimensions[YGDimensionWidth]);
YG_NODE_STYLE_PROPERTY_UNIT_AUTO_IMPL(YGValue, Height, height, dimensions[YGDimensionHeight]);
YG_NODE_STYLE_PROPERTY_UNIT_IMPL(YGValue, MinWidth, minWidth, minDimensions[YGDimensionWidth]);
YG_NODE_STYLE_PROPERTY_UNIT_IMPL(YGValue, MinHeight, minHeight, minDimensions[YGDimensionHeight]);
YG_NODE_STYLE_PROPERTY_UNIT_IMPL(YGValue, MaxWidth, maxWidth, maxDimensions[YGDimensionWidth]);
YG_NODE_STYLE_PROPERTY_UNIT_IMPL(YGValue, MaxHeight, maxHeight, maxDimensions[YGDimensionHeight]);
// Yoga specific properties, not compatible with flexbox specification
YG_NODE_STYLE_PROPERTY_IMPL(float, AspectRatio, aspectRatio, aspectRatio);
YG_NODE_LAYOUT_PROPERTY_IMPL(float, Left, position[YGEdgeLeft]);
YG_NODE_LAYOUT_PROPERTY_IMPL(float, Top, position[YGEdgeTop]);
YG_NODE_LAYOUT_PROPERTY_IMPL(float, Right, position[YGEdgeRight]);
YG_NODE_LAYOUT_PROPERTY_IMPL(float, Bottom, position[YGEdgeBottom]);
YG_NODE_LAYOUT_PROPERTY_IMPL(float, Width, dimensions[YGDimensionWidth]);
YG_NODE_LAYOUT_PROPERTY_IMPL(float, Height, dimensions[YGDimensionHeight]);
YG_NODE_LAYOUT_PROPERTY_IMPL(YGDirection, Direction, direction);
YG_NODE_LAYOUT_PROPERTY_IMPL(bool, HadOverflow, hadOverflow);
YG_NODE_LAYOUT_RESOLVED_PROPERTY_IMPL(float, Margin, margin);
YG_NODE_LAYOUT_RESOLVED_PROPERTY_IMPL(float, Border, border);
YG_NODE_LAYOUT_RESOLVED_PROPERTY_IMPL(float, Padding, padding);
uint32_t gCurrentGenerationCount = 0;
bool YGLayoutNodeInternal(const YGNodeRef node,
const float availableWidth,
const float availableHeight,
const YGDirection parentDirection,
const YGMeasureMode widthMeasureMode,
const YGMeasureMode heightMeasureMode,
const float parentWidth,
const float parentHeight,
const bool performLayout,
const char *reason,
const YGConfigRef config);
bool YGFloatsEqual(const float a, const float b) {
if (YGFloatIsUndefined(a)) {
return YGFloatIsUndefined(b);
}
return fabs(a - b) < 0.0001f;
}
static void YGNodePrintInternal(const YGNodeRef node,
const YGPrintOptions options) {
std::string str;
facebook::yoga::YGNodeToString(&str, node, options, 0);
YGLog(node, YGLogLevelDebug, str.c_str());
}
void YGNodePrint(const YGNodeRef node, const YGPrintOptions options) {
YGNodePrintInternal(node, options);
}
const std::array<YGEdge, 4> leading = {
{YGEdgeTop, YGEdgeBottom, YGEdgeLeft, YGEdgeRight}};
const std::array<YGEdge, 4> trailing = {
{YGEdgeBottom, YGEdgeTop, YGEdgeRight, YGEdgeLeft}};
static const std::array<YGEdge, 4> pos = {{
YGEdgeTop,
YGEdgeBottom,
YGEdgeLeft,
YGEdgeRight,
}};
static const std::array<YGDimension, 4> dim = {
{YGDimensionHeight, YGDimensionHeight, YGDimensionWidth, YGDimensionWidth}};
static inline float YGNodeTrailingPaddingAndBorder(const YGNodeRef node,
const YGFlexDirection axis,
const float widthSize) {
return node->getTrailingPadding(axis, widthSize) +
node->getTrailingBorder(axis);
}
static inline float YGNodeMarginForAxis(const YGNodeRef node,
const YGFlexDirection axis,
const float widthSize) {
return node->getLeadingMargin(axis, widthSize) +
node->getTrailingMargin(axis, widthSize);
}
static inline float YGNodePaddingAndBorderForAxis(const YGNodeRef node,
const YGFlexDirection axis,
const float widthSize) {
return node->getLeadingPaddingAndBorder(axis, widthSize) +
YGNodeTrailingPaddingAndBorder(node, axis, widthSize);
}
static inline YGAlign YGNodeAlignItem(const YGNodeRef node, const YGNodeRef child) {
const YGAlign align = child->getStyle().alignSelf == YGAlignAuto
? node->getStyle().alignItems
: child->getStyle().alignSelf;
if (align == YGAlignBaseline &&
YGFlexDirectionIsColumn(node->getStyle().flexDirection)) {
return YGAlignFlexStart;
}
return align;
}
static float YGBaseline(const YGNodeRef node) {
if (node->getBaseline() != nullptr) {
const float baseline = node->getBaseline()(
node,
node->getLayout().measuredDimensions[YGDimensionWidth],
node->getLayout().measuredDimensions[YGDimensionHeight]);
YGAssertWithNode(node,
!YGFloatIsUndefined(baseline),
"Expect custom baseline function to not return NaN");
return baseline;
}
YGNodeRef baselineChild = nullptr;
const uint32_t childCount = YGNodeGetChildCount(node);
for (uint32_t i = 0; i < childCount; i++) {
const YGNodeRef child = YGNodeGetChild(node, i);
if (child->getLineIndex() > 0) {
break;
}
if (child->getStyle().positionType == YGPositionTypeAbsolute) {
continue;
}
if (YGNodeAlignItem(node, child) == YGAlignBaseline) {
baselineChild = child;
break;
}
if (baselineChild == nullptr) {
baselineChild = child;
}
}
if (baselineChild == nullptr) {
return node->getLayout().measuredDimensions[YGDimensionHeight];
}
const float baseline = YGBaseline(baselineChild);
return baseline + baselineChild->getLayout().position[YGEdgeTop];
}
static bool YGIsBaselineLayout(const YGNodeRef node) {
if (YGFlexDirectionIsColumn(node->getStyle().flexDirection)) {
return false;
}
if (node->getStyle().alignItems == YGAlignBaseline) {
return true;
}
const uint32_t childCount = YGNodeGetChildCount(node);
for (uint32_t i = 0; i < childCount; i++) {
const YGNodeRef child = YGNodeGetChild(node, i);
if (child->getStyle().positionType == YGPositionTypeRelative &&
child->getStyle().alignSelf == YGAlignBaseline) {
return true;
}
}
return false;
}
static inline float YGNodeDimWithMargin(const YGNodeRef node,
const YGFlexDirection axis,
const float widthSize) {
return node->getLayout().measuredDimensions[dim[axis]] +
node->getLeadingMargin(axis, widthSize) +
node->getTrailingMargin(axis, widthSize);
}
static inline bool YGNodeIsStyleDimDefined(const YGNodeRef node,
const YGFlexDirection axis,
const float parentSize) {
return !(
node->getResolvedDimension(dim[axis]).unit == YGUnitAuto ||
node->getResolvedDimension(dim[axis]).unit == YGUnitUndefined ||
(node->getResolvedDimension(dim[axis]).unit == YGUnitPoint &&
node->getResolvedDimension(dim[axis]).value < 0.0f) ||
(node->getResolvedDimension(dim[axis]).unit == YGUnitPercent &&
(node->getResolvedDimension(dim[axis]).value < 0.0f ||
YGFloatIsUndefined(parentSize))));
}
static inline bool YGNodeIsLayoutDimDefined(const YGNodeRef node, const YGFlexDirection axis) {
const float value = node->getLayout().measuredDimensions[dim[axis]];
return !YGFloatIsUndefined(value) && value >= 0.0f;
}
static float YGNodeBoundAxisWithinMinAndMax(const YGNodeRef node,
const YGFlexDirection axis,
const float value,
const float axisSize) {
float min = YGUndefined;
float max = YGUndefined;
if (YGFlexDirectionIsColumn(axis)) {
min = YGResolveValue(
node->getStyle().minDimensions[YGDimensionHeight], axisSize);
max = YGResolveValue(
node->getStyle().maxDimensions[YGDimensionHeight], axisSize);
} else if (YGFlexDirectionIsRow(axis)) {
min = YGResolveValue(
node->getStyle().minDimensions[YGDimensionWidth], axisSize);
max = YGResolveValue(
node->getStyle().maxDimensions[YGDimensionWidth], axisSize);
}
float boundValue = value;
if (!YGFloatIsUndefined(max) && max >= 0.0f && boundValue > max) {
boundValue = max;
}
if (!YGFloatIsUndefined(min) && min >= 0.0f && boundValue < min) {
boundValue = min;
}
return boundValue;
}
// Like YGNodeBoundAxisWithinMinAndMax but also ensures that the value doesn't go
// below the
// padding and border amount.
static inline float YGNodeBoundAxis(const YGNodeRef node,
const YGFlexDirection axis,
const float value,
const float axisSize,
const float widthSize) {
return fmaxf(YGNodeBoundAxisWithinMinAndMax(node, axis, value, axisSize),
YGNodePaddingAndBorderForAxis(node, axis, widthSize));
}
static void YGNodeSetChildTrailingPosition(const YGNodeRef node,
const YGNodeRef child,
const YGFlexDirection axis) {
const float size = child->getLayout().measuredDimensions[dim[axis]];
child->setLayoutPosition(
node->getLayout().measuredDimensions[dim[axis]] - size -
child->getLayout().position[pos[axis]],
trailing[axis]);
}
static void YGConstrainMaxSizeForMode(const YGNodeRef node,
const enum YGFlexDirection axis,
const float parentAxisSize,
const float parentWidth,
YGMeasureMode *mode,
float *size) {
const float maxSize =
YGResolveValue(
node->getStyle().maxDimensions[dim[axis]], parentAxisSize) +
YGNodeMarginForAxis(node, axis, parentWidth);
switch (*mode) {
case YGMeasureModeExactly:
case YGMeasureModeAtMost:
*size = (YGFloatIsUndefined(maxSize) || *size < maxSize) ? *size : maxSize;
break;
case YGMeasureModeUndefined:
if (!YGFloatIsUndefined(maxSize)) {
*mode = YGMeasureModeAtMost;
*size = maxSize;
}
break;
}
}
static void YGNodeComputeFlexBasisForChild(const YGNodeRef node,
const YGNodeRef child,
const float width,
const YGMeasureMode widthMode,
const float height,
const float parentWidth,
const float parentHeight,
const YGMeasureMode heightMode,
const YGDirection direction,
const YGConfigRef config) {
const YGFlexDirection mainAxis =
YGResolveFlexDirection(node->getStyle().flexDirection, direction);
const bool isMainAxisRow = YGFlexDirectionIsRow(mainAxis);
const float mainAxisSize = isMainAxisRow ? width : height;
const float mainAxisParentSize = isMainAxisRow ? parentWidth : parentHeight;
float childWidth;
float childHeight;
YGMeasureMode childWidthMeasureMode;
YGMeasureMode childHeightMeasureMode;
const float resolvedFlexBasis =
YGResolveValue(child->resolveFlexBasisPtr(), mainAxisParentSize);
const bool isRowStyleDimDefined = YGNodeIsStyleDimDefined(child, YGFlexDirectionRow, parentWidth);
const bool isColumnStyleDimDefined =
YGNodeIsStyleDimDefined(child, YGFlexDirectionColumn, parentHeight);
if (!YGFloatIsUndefined(resolvedFlexBasis) && !YGFloatIsUndefined(mainAxisSize)) {
if (YGFloatIsUndefined(child->getLayout().computedFlexBasis) ||
(YGConfigIsExperimentalFeatureEnabled(
child->getConfig(), YGExperimentalFeatureWebFlexBasis) &&
child->getLayout().computedFlexBasisGeneration !=
gCurrentGenerationCount)) {
child->setLayoutComputedFlexBasis(fmaxf(
resolvedFlexBasis,
YGNodePaddingAndBorderForAxis(child, mainAxis, parentWidth)));
}
} else if (isMainAxisRow && isRowStyleDimDefined) {
// The width is definite, so use that as the flex basis.
child->setLayoutComputedFlexBasis(fmaxf(
YGResolveValue(