From e223f2c2bf31e9712d0ea2a36f614958aeb286fb Mon Sep 17 00:00:00 2001
From: Valentin Shergin <shergin@fb.com>
Date: Wed, 1 Jul 2020 18:23:06 -0700
Subject: [PATCH] Fabric: Gating for on-demand view mounting in ScrollView

Summary:
Just gating.

Changelog: [Internal] Fabric-specific internal change.

Reviewed By: sammy-SC

Differential Revision: D22325692

fbshipit-source-id: 14cdfb4bf10ad00e090a91659138639360020fca
---
 React/Fabric/RCTSurfacePresenter.mm | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/React/Fabric/RCTSurfacePresenter.mm b/React/Fabric/RCTSurfacePresenter.mm
index 2d4e6593a61..5b5ab91cec7 100644
--- a/React/Fabric/RCTSurfacePresenter.mm
+++ b/React/Fabric/RCTSurfacePresenter.mm
@@ -23,6 +23,8 @@
 #import <React/RCTSurfaceView.h>
 #import <React/RCTUtils.h>
 
+#import <React/RCTScrollViewComponentView.h>
+
 #import <react/componentregistry/ComponentDescriptorFactory.h>
 #import <react/components/root/RootShadowNode.h>
 #import <react/config/ReactNativeConfig.h>
@@ -288,6 +290,10 @@ static inline LayoutContext RCTGetLayoutContext()
 {
   auto reactNativeConfig = _contextContainer->at<std::shared_ptr<ReactNativeConfig const>>("ReactNativeConfig");
 
+  if (reactNativeConfig && reactNativeConfig->getBool("react_fabric:scrollview_on_demand_mounting_ios")) {
+    RCTSetEnableOnDemandViewMounting(YES);
+  }
+
   auto componentRegistryFactory =
       [factory = wrapManagedObject(_mountingManager.componentViewRegistry.componentViewFactory)](
           EventDispatcher::Weak const &eventDispatcher, ContextContainer::Shared const &contextContainer) {