Fabric: ParagraphShadowNode::updateLocalDataIfNeeded()

Summary: Now we don't update `LocalData` for `ParagraphShadowNode` if the attributed string hasn't changed.

Reviewed By: mdvacca

Differential Revision: D13160128

fbshipit-source-id: 6ffe76ad187452fa37ba36a132b885cbcedfd1d3

ReactCommon/fabric/components/text/paragraph/ParagraphShadowNode.cpp

@@ -32,11 +32,17 @@ void ParagraphShadowNode::setTextLayoutManager(
   textLayoutManager_ = textLayoutManager;
 }
 
-void ParagraphShadowNode::updateLocalData() {
+void ParagraphShadowNode::updateLocalDataIfNeeded() {
   ensureUnsealed();
 
+  auto attributedString = getAttributedString();
+  auto currentLocalData = std::static_pointer_cast<const ParagraphLocalData>(getLocalData());
+  if (currentLocalData && currentLocalData->getAttributedString() == attributedString) {
+    return;
+  }
+
   auto localData = std::make_shared<ParagraphLocalData>();
-  localData->setAttributedString(getAttributedString());
+  localData->setAttributedString(std::move(attributedString));
   localData->setTextLayoutManager(textLayoutManager_);
   setLocalData(localData);
 }
@@ -52,7 +58,7 @@ Size ParagraphShadowNode::measure(LayoutConstraints layoutConstraints) const {
 }
 
 void ParagraphShadowNode::layout(LayoutContext layoutContext) {
-  updateLocalData();
+  updateLocalDataIfNeeded();
   ConcreteViewShadowNode::layout(layoutContext);
 }
 

ReactCommon/fabric/components/text/paragraph/ParagraphShadowNode.h

@@ -58,7 +58,7 @@ class ParagraphShadowNode : public ConcreteViewShadowNode<
    * Creates a `LocalData` object (with `AttributedText` and
    * `TextLayoutManager`) if needed.
    */
-  void updateLocalData();
+  void updateLocalDataIfNeeded();
 
   SharedTextLayoutManager textLayoutManager_;