Remove the use of legacy flag and log the diff if its used

Summary: Check if the layout tree is different if we do not use legacy flags. If they are different then report to the client

Reviewed By: emilsjolander

Differential Revision: D6856812

fbshipit-source-id: e4724d80702cc75c1894e348e137b24e663573d2

yoga/YGNode.cpp

@@ -572,6 +572,13 @@ void YGNode::markDirtyAndPropogate() {
   }
 }
 
+void YGNode::markDirtyAndPropogateDownwards() {
+  isDirty_ = true;
+  for_each(children_.begin(), children_.end(), [](YGNodeRef childNode) {
+    childNode->markDirtyAndPropogateDownwards();
+  });
+}
+
 float YGNode::resolveFlexGrow() {
   // Root nodes flexGrow should always be 0
   if (parent_ == nullptr) {
@@ -666,3 +673,57 @@ float YGNode::getLeadingPaddingAndBorder(
     const float widthSize) {
   return getLeadingPadding(axis, widthSize) + getLeadingBorder(axis);
 }
+
+bool YGNode::didUseLegacyFlag() {
+  bool didUseLegacyFlag = layout_.didUseLegacyFlag;
+  if (didUseLegacyFlag) {
+    return true;
+  }
+  for (const auto& child : children_) {
+    if (child->layout_.didUseLegacyFlag) {
+      didUseLegacyFlag = true;
+      break;
+    }
+  }
+  return didUseLegacyFlag;
+}
+
+void YGNode::setAndPropogateUseLegacyFlag(bool useLegacyFlag) {
+  config_->useLegacyStretchBehaviour = useLegacyFlag;
+  for_each(children_.begin(), children_.end(), [=](YGNodeRef childNode) {
+    childNode->getConfig()->useLegacyStretchBehaviour = useLegacyFlag;
+  });
+}
+
+void YGNode::setLayoutDoesLegacyFlagAffectsLayout(
+    bool doesLegacyFlagAffectsLayout) {
+  layout_.doesLegacyStretchFlagAffectsLayout = doesLegacyFlagAffectsLayout;
+}
+
+void YGNode::setLayoutDidUseLegacyFlag(bool didUseLegacyFlag) {
+  layout_.didUseLegacyFlag = didUseLegacyFlag;
+}
+
+bool YGNode::isLayoutTreeEqualToNode(const YGNode& node) const {
+  if (children_.size() != node.children_.size()) {
+    return false;
+  }
+  if (layout_ != node.layout_) {
+    return false;
+  }
+  if (children_.size() == 0) {
+    return true;
+  }
+
+  bool isLayoutTreeEqual = true;
+  YGNodeRef otherNodeChildren = nullptr;
+  for (std::vector<YGNodeRef>::size_type i = 0; i < children_.size(); ++i) {
+    otherNodeChildren = node.children_[i];
+    isLayoutTreeEqual =
+        children_[i]->isLayoutTreeEqualToNode(*otherNodeChildren);
+    if (!isLayoutTreeEqual) {
+      return false;
+    }
+  }
+  return isLayoutTreeEqual;
+}