Refactor BaseProps.resolveborderMetrics method (#45554)

Summary:
Pull Request resolved: #45554

In this diff I'm extracting the creation of borderWidth into its own method, this is necessary for next diffs of the stack.

Nh behavior change is introduced here

changelog: [internal] internal

Reviewed By: NickGerleman

Differential Revision: D59942306

fbshipit-source-id: 85d39b64deaa4e8a8632d6f4aab72f626e594b5d

packages/react-native/ReactCommon/react/renderer/components/view/BaseViewProps.cpp

@@ -432,12 +432,8 @@ static BorderRadii radiiPercentToPoint(
   };
 }
 
-BorderMetrics BaseViewProps::resolveBorderMetrics(
-    const LayoutMetrics& layoutMetrics) const {
-  auto isRTL =
-      bool{layoutMetrics.layoutDirection == LayoutDirection::RightToLeft};
-
-  auto borderWidths = CascadedBorderWidths{
+CascadedBorderWidths BaseViewProps::getBorderWidths() const {
+  return CascadedBorderWidths{
       /* .left = */ optionalFloatFromYogaValue(
           yogaStyle.border(yoga::Edge::Left)),
       /* .top = */
@@ -457,6 +453,14 @@ BorderMetrics BaseViewProps::resolveBorderMetrics(
       /* .all = */
       optionalFloatFromYogaValue(yogaStyle.border(yoga::Edge::All)),
   };
+}
+
+BorderMetrics BaseViewProps::resolveBorderMetrics(
+    const LayoutMetrics& layoutMetrics) const {
+  auto isRTL =
+      bool{layoutMetrics.layoutDirection == LayoutDirection::RightToLeft};
+
+  auto borderWidths = getBorderWidths();
 
   BorderRadii radii = radiiPercentToPoint(
       borderRadii.resolve(isRTL, ValueUnit{0.0f, UnitType::Point}),

packages/react-native/ReactCommon/react/renderer/components/view/BaseViewProps.h

@@ -96,6 +96,7 @@ class BaseViewProps : public YogaStylableProps, public AccessibilityProps {
 
 #pragma mark - Convenience Methods
 
+  CascadedBorderWidths getBorderWidths() const;
   BorderMetrics resolveBorderMetrics(const LayoutMetrics& layoutMetrics) const;
   Transform resolveTransform(const LayoutMetrics& layoutMetrics) const;
   bool getClipsContentToBounds() const;