Moved out logic to calculate size consumed on a line into seperate function

Summary: Moved out logic to calculate size consumed on a line into seperate function

Reviewed By: emilsjolander

Differential Revision: D6797640

fbshipit-source-id: ad9757e7d603c0ce57f452b1e5c404037605bed9

yoga/Utils.h

@@ -11,6 +11,41 @@
 #include "YGNode.h"
 #include "Yoga-internal.h"
 
+// This struct is an helper model to hold the data for step 4 of flexbox
+// algo, which is collecting the flex items in a line.
+//
+// - itemsOnLine: Number of items which can fit in a line considering the
+// available Inner dimension, the flex items computed flexbasis and their
+// margin. It may be different than the difference between start and end
+// indicates because we skip over absolute-positioned items.
+//
+// - sizeConsumedOnCurrentLine: It is accumulation of the dimensions and margin
+// of all the children on the current line. This will be used in order to either
+// set the dimensions of the node if none already exist or to compute the
+// remaining space left for the flexible children.
+//
+// - totalFlexGrowFactors: total flex grow factors of flex items which are to be
+// layed in the current line
+//
+// - totalFlexShrinkFactors: total flex shrink factors of flex items which are
+// to be layed in the current line
+//
+// - endOfLineIndex: Its the end index of the last flex item which was examined
+// and it may or may not be part of the current line(as it may be absolutely
+// positioned or inculding it may have caused to overshoot availableInnerDim)
+//
+// - relativeChildren: Maintain a vector of the child nodes that can shrink
+// and/or grow.
+
+struct YGCollectFlexItemsRowValues {
+  uint32_t itemsOnLine;
+  float sizeConsumedOnCurrentLine;
+  float totalFlexGrowFactors;
+  float totalFlexShrinkScaledFactors;
+  float endOfLineIndex;
+  std::vector<YGNodeRef> relativeChildren;
+};
+
 bool YGValueEqual(const YGValue a, const YGValue b);
 
 YGFlexDirection YGFlexDirectionCross(