Seperate function for second pass
Reviewed By: emilsjolander Differential Revision: D6833635 fbshipit-source-id: 7680a67db8bfe22f8fb86407159888882f3a3353
This commit is contained in:
Pritesh Nandgaonkar
Facebook Github Bot
parent
fda861a889
commit
ca91f0e3ac
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@ -1701,6 +1701,183 @@ static YGCollectFlexItemsRowValues YGCalculateCollectFlexItemsRowValues(
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return flexAlgoRowMeasurement;
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}
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static void YGDistributeFreeSpaceSecondPass(
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YGCollectFlexItemsRowValues& collectedFlexItemsValues,
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const YGNodeRef node,
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const YGFlexDirection mainAxis,
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const YGFlexDirection crossAxis,
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const float mainAxisParentSize,
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const float availableInnerMainDim,
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const float availableInnerCrossDim,
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const float availableInnerWidth,
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const float availableInnerHeight,
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const bool flexBasisOverflows,
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const YGMeasureMode measureModeCrossDim,
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const bool performLayout,
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const YGConfigRef config) {
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float childFlexBasis = 0;
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float flexShrinkScaledFactor = 0;
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float flexGrowFactor = 0;
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float deltaFreeSpace = 0;
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const bool isMainAxisRow = YGFlexDirectionIsRow(mainAxis);
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const bool isNodeFlexWrap = node->getStyle().flexWrap != YGWrapNoWrap;
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for (auto currentRelativeChild : collectedFlexItemsValues.relativeChildren) {
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childFlexBasis = YGNodeBoundAxisWithinMinAndMax(
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currentRelativeChild,
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mainAxis,
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currentRelativeChild->getLayout().computedFlexBasis,
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mainAxisParentSize);
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float updatedMainSize = childFlexBasis;
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if (collectedFlexItemsValues.remainingFreeSpace < 0) {
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flexShrinkScaledFactor =
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-currentRelativeChild->resolveFlexShrink() * childFlexBasis;
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// Is this child able to shrink?
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if (flexShrinkScaledFactor != 0) {
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float childSize;
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if (collectedFlexItemsValues.totalFlexShrinkScaledFactors == 0) {
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childSize = childFlexBasis + flexShrinkScaledFactor;
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} else {
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childSize = childFlexBasis +
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(collectedFlexItemsValues.remainingFreeSpace /
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collectedFlexItemsValues.totalFlexShrinkScaledFactors) *
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flexShrinkScaledFactor;
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}
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updatedMainSize = YGNodeBoundAxis(
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currentRelativeChild,
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mainAxis,
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childSize,
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availableInnerMainDim,
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availableInnerWidth);
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}
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} else if (collectedFlexItemsValues.remainingFreeSpace > 0) {
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flexGrowFactor = currentRelativeChild->resolveFlexGrow();
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// Is this child able to grow?
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if (flexGrowFactor != 0) {
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updatedMainSize = YGNodeBoundAxis(
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currentRelativeChild,
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mainAxis,
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childFlexBasis +
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collectedFlexItemsValues.remainingFreeSpace /
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collectedFlexItemsValues.totalFlexGrowFactors *
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flexGrowFactor,
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availableInnerMainDim,
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availableInnerWidth);
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}
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}
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deltaFreeSpace -= updatedMainSize - childFlexBasis;
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const float marginMain = YGNodeMarginForAxis(
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currentRelativeChild, mainAxis, availableInnerWidth);
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const float marginCross = YGNodeMarginForAxis(
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currentRelativeChild, crossAxis, availableInnerWidth);
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float childCrossSize;
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float childMainSize = updatedMainSize + marginMain;
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YGMeasureMode childCrossMeasureMode;
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YGMeasureMode childMainMeasureMode = YGMeasureModeExactly;
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if (!YGFloatIsUndefined(currentRelativeChild->getStyle().aspectRatio)) {
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childCrossSize = isMainAxisRow ? (childMainSize - marginMain) /
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currentRelativeChild->getStyle().aspectRatio
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: (childMainSize - marginMain) *
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currentRelativeChild->getStyle().aspectRatio;
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childCrossMeasureMode = YGMeasureModeExactly;
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childCrossSize += marginCross;
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} else if (
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!YGFloatIsUndefined(availableInnerCrossDim) &&
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!YGNodeIsStyleDimDefined(
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currentRelativeChild, crossAxis, availableInnerCrossDim) &&
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measureModeCrossDim == YGMeasureModeExactly &&
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!(isNodeFlexWrap && flexBasisOverflows) &&
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YGNodeAlignItem(node, currentRelativeChild) == YGAlignStretch &&
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currentRelativeChild->marginLeadingValue(crossAxis).unit !=
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YGUnitAuto &&
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currentRelativeChild->marginTrailingValue(crossAxis).unit !=
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YGUnitAuto) {
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childCrossSize = availableInnerCrossDim;
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childCrossMeasureMode = YGMeasureModeExactly;
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} else if (!YGNodeIsStyleDimDefined(
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currentRelativeChild, crossAxis, availableInnerCrossDim)) {
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childCrossSize = availableInnerCrossDim;
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childCrossMeasureMode = YGFloatIsUndefined(childCrossSize)
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? YGMeasureModeUndefined
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: YGMeasureModeAtMost;
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} else {
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childCrossSize =
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YGResolveValue(
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currentRelativeChild->getResolvedDimension(dim[crossAxis]),
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availableInnerCrossDim) +
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marginCross;
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const bool isLoosePercentageMeasurement =
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currentRelativeChild->getResolvedDimension(dim[crossAxis]).unit ==
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YGUnitPercent &&
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measureModeCrossDim != YGMeasureModeExactly;
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childCrossMeasureMode =
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YGFloatIsUndefined(childCrossSize) || isLoosePercentageMeasurement
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? YGMeasureModeUndefined
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: YGMeasureModeExactly;
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}
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YGConstrainMaxSizeForMode(
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currentRelativeChild,
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mainAxis,
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availableInnerMainDim,
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availableInnerWidth,
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&childMainMeasureMode,
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&childMainSize);
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YGConstrainMaxSizeForMode(
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currentRelativeChild,
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crossAxis,
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availableInnerCrossDim,
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availableInnerWidth,
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&childCrossMeasureMode,
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&childCrossSize);
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const bool requiresStretchLayout =
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!YGNodeIsStyleDimDefined(
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currentRelativeChild, crossAxis, availableInnerCrossDim) &&
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YGNodeAlignItem(node, currentRelativeChild) == YGAlignStretch &&
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currentRelativeChild->marginLeadingValue(crossAxis).unit !=
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YGUnitAuto &&
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currentRelativeChild->marginTrailingValue(crossAxis).unit != YGUnitAuto;
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const float childWidth = isMainAxisRow ? childMainSize : childCrossSize;
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const float childHeight = !isMainAxisRow ? childMainSize : childCrossSize;
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const YGMeasureMode childWidthMeasureMode =
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isMainAxisRow ? childMainMeasureMode : childCrossMeasureMode;
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const YGMeasureMode childHeightMeasureMode =
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!isMainAxisRow ? childMainMeasureMode : childCrossMeasureMode;
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// Recursively call the layout algorithm for this child with the updated
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// main size.
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YGLayoutNodeInternal(
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currentRelativeChild,
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childWidth,
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childHeight,
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node->getLayout().direction,
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childWidthMeasureMode,
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childHeightMeasureMode,
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availableInnerWidth,
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availableInnerHeight,
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performLayout && !requiresStretchLayout,
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"flex",
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config);
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node->setLayoutHadOverflow(
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node->getLayout().hadOverflow |
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currentRelativeChild->getLayout().hadOverflow);
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}
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collectedFlexItemsValues.remainingFreeSpace += deltaFreeSpace;
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}
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// It distributes the free space to the flexible items, for those flexible items
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// whose min and max constraints are triggered, the clamped size is removed from
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// the remaingfreespace.
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@ -2126,15 +2303,7 @@ static void YGNodelayoutImpl(const YGNodeRef node,
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-collectedFlexItemsValues.sizeConsumedOnCurrentLine;
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}
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const float originalRemainingFreeSpace =
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collectedFlexItemsValues.remainingFreeSpace;
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float deltaFreeSpace = 0;
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if (!canSkipFlex) {
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float childFlexBasis;
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float flexShrinkScaledFactor;
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float flexGrowFactor;
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// Do two passes over the flex items to figure out how to distribute the
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// remaining space.
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// The first pass finds the items whose min/max constraints trigger,
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@ -2166,169 +2335,22 @@ static void YGNodelayoutImpl(const YGNodeRef node,
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availableInnerWidth);
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// Second pass: resolve the sizes of the flexible items
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deltaFreeSpace = 0;
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for (auto currentRelativeChild :
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collectedFlexItemsValues.relativeChildren) {
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childFlexBasis = YGNodeBoundAxisWithinMinAndMax(
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currentRelativeChild,
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mainAxis,
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currentRelativeChild->getLayout().computedFlexBasis,
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mainAxisParentSize);
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float updatedMainSize = childFlexBasis;
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if (collectedFlexItemsValues.remainingFreeSpace < 0) {
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flexShrinkScaledFactor =
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-currentRelativeChild->resolveFlexShrink() * childFlexBasis;
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// Is this child able to shrink?
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if (flexShrinkScaledFactor != 0) {
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float childSize;
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if (collectedFlexItemsValues.totalFlexShrinkScaledFactors == 0) {
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childSize = childFlexBasis + flexShrinkScaledFactor;
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} else {
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childSize = childFlexBasis +
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(collectedFlexItemsValues.remainingFreeSpace /
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collectedFlexItemsValues.totalFlexShrinkScaledFactors) *
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flexShrinkScaledFactor;
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}
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updatedMainSize = YGNodeBoundAxis(
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currentRelativeChild,
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mainAxis,
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childSize,
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availableInnerMainDim,
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availableInnerWidth);
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}
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} else if (collectedFlexItemsValues.remainingFreeSpace > 0) {
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flexGrowFactor = currentRelativeChild->resolveFlexGrow();
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// Is this child able to grow?
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if (flexGrowFactor != 0) {
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updatedMainSize = YGNodeBoundAxis(
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currentRelativeChild,
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mainAxis,
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childFlexBasis +
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collectedFlexItemsValues.remainingFreeSpace /
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collectedFlexItemsValues.totalFlexGrowFactors *
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flexGrowFactor,
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availableInnerMainDim,
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availableInnerWidth);
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}
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}
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deltaFreeSpace -= updatedMainSize - childFlexBasis;
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const float marginMain = YGNodeMarginForAxis(
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currentRelativeChild, mainAxis, availableInnerWidth);
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const float marginCross = YGNodeMarginForAxis(
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currentRelativeChild, crossAxis, availableInnerWidth);
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float childCrossSize;
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float childMainSize = updatedMainSize + marginMain;
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YGMeasureMode childCrossMeasureMode;
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YGMeasureMode childMainMeasureMode = YGMeasureModeExactly;
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if (!YGFloatIsUndefined(currentRelativeChild->getStyle().aspectRatio)) {
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childCrossSize = isMainAxisRow ? (childMainSize - marginMain) /
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currentRelativeChild->getStyle().aspectRatio
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: (childMainSize - marginMain) *
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currentRelativeChild->getStyle().aspectRatio;
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childCrossMeasureMode = YGMeasureModeExactly;
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childCrossSize += marginCross;
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} else if (
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!YGFloatIsUndefined(availableInnerCrossDim) &&
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!YGNodeIsStyleDimDefined(
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currentRelativeChild, crossAxis, availableInnerCrossDim) &&
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measureModeCrossDim == YGMeasureModeExactly &&
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!(isNodeFlexWrap && flexBasisOverflows) &&
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YGNodeAlignItem(node, currentRelativeChild) == YGAlignStretch &&
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currentRelativeChild->marginLeadingValue(crossAxis).unit !=
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YGUnitAuto &&
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currentRelativeChild->marginTrailingValue(crossAxis).unit !=
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YGUnitAuto) {
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childCrossSize = availableInnerCrossDim;
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childCrossMeasureMode = YGMeasureModeExactly;
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} else if (!YGNodeIsStyleDimDefined(
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currentRelativeChild,
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crossAxis,
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availableInnerCrossDim)) {
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childCrossSize = availableInnerCrossDim;
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childCrossMeasureMode = YGFloatIsUndefined(childCrossSize)
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? YGMeasureModeUndefined
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: YGMeasureModeAtMost;
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} else {
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childCrossSize =
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YGResolveValue(
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currentRelativeChild->getResolvedDimension(dim[crossAxis]),
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availableInnerCrossDim) +
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marginCross;
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const bool isLoosePercentageMeasurement =
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currentRelativeChild->getResolvedDimension(dim[crossAxis]).unit ==
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YGUnitPercent &&
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measureModeCrossDim != YGMeasureModeExactly;
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childCrossMeasureMode =
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YGFloatIsUndefined(childCrossSize) || isLoosePercentageMeasurement
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? YGMeasureModeUndefined
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: YGMeasureModeExactly;
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}
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YGConstrainMaxSizeForMode(
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currentRelativeChild,
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mainAxis,
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availableInnerMainDim,
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availableInnerWidth,
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&childMainMeasureMode,
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&childMainSize);
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YGConstrainMaxSizeForMode(
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currentRelativeChild,
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crossAxis,
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availableInnerCrossDim,
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availableInnerWidth,
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&childCrossMeasureMode,
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&childCrossSize);
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const bool requiresStretchLayout =
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!YGNodeIsStyleDimDefined(
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currentRelativeChild, crossAxis, availableInnerCrossDim) &&
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YGNodeAlignItem(node, currentRelativeChild) == YGAlignStretch &&
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currentRelativeChild->marginLeadingValue(crossAxis).unit !=
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YGUnitAuto &&
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currentRelativeChild->marginTrailingValue(crossAxis).unit !=
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YGUnitAuto;
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const float childWidth = isMainAxisRow ? childMainSize : childCrossSize;
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const float childHeight =
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!isMainAxisRow ? childMainSize : childCrossSize;
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const YGMeasureMode childWidthMeasureMode =
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isMainAxisRow ? childMainMeasureMode : childCrossMeasureMode;
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const YGMeasureMode childHeightMeasureMode =
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!isMainAxisRow ? childMainMeasureMode : childCrossMeasureMode;
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// Recursively call the layout algorithm for this child with the updated
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// main size.
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YGLayoutNodeInternal(
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currentRelativeChild,
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childWidth,
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childHeight,
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direction,
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childWidthMeasureMode,
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childHeightMeasureMode,
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availableInnerWidth,
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availableInnerHeight,
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performLayout && !requiresStretchLayout,
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"flex",
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config);
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node->setLayoutHadOverflow(
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node->getLayout().hadOverflow |
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currentRelativeChild->getLayout().hadOverflow);
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currentRelativeChild = currentRelativeChild->getNextChild();
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}
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YGDistributeFreeSpaceSecondPass(
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collectedFlexItemsValues,
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node,
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mainAxis,
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crossAxis,
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mainAxisParentSize,
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availableInnerMainDim,
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availableInnerCrossDim,
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availableInnerWidth,
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availableInnerHeight,
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flexBasisOverflows,
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measureModeCrossDim,
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performLayout,
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config);
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}
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collectedFlexItemsValues.remainingFreeSpace =
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originalRemainingFreeSpace + deltaFreeSpace;
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node->setLayoutHadOverflow(
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node->getLayout().hadOverflow |
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(collectedFlexItemsValues.remainingFreeSpace < 0));
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