From 1fc56113d2480c8604461abd368f80ab0e0fa101 Mon Sep 17 00:00:00 2001
From: Christoph Purrer <chpurrer@meta.com>
Date: Mon, 6 Jan 2025 09:58:14 -0800
Subject: [PATCH] Add getSurfaceProps helper method to SurfaceManager (#48487)

Summary:

[Changelog] [Internal] - Add getSurfaceProps helper method to SurfaceManager

When reload a reactHost we need to know which surface properties have been applied when starting the surface. This adds a utility function for that.

Reviewed By: rshest

Differential Revision: D67822459
---
 .../react/renderer/scheduler/SurfaceManager.cpp  | 16 ++++++++++++++++
 .../react/renderer/scheduler/SurfaceManager.h    | 13 +++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/packages/react-native/ReactCommon/react/renderer/scheduler/SurfaceManager.cpp b/packages/react-native/ReactCommon/react/renderer/scheduler/SurfaceManager.cpp
index 5e280a68349c07..f7457841fbe9ee 100644
--- a/packages/react-native/ReactCommon/react/renderer/scheduler/SurfaceManager.cpp
+++ b/packages/react-native/ReactCommon/react/renderer/scheduler/SurfaceManager.cpp
@@ -78,6 +78,22 @@ void SurfaceManager::stopAllSurfaces() const noexcept {
   }
 }
 
+std::optional<SurfaceManager::SurfaceProps> SurfaceManager::getSurfaceProps(
+    SurfaceId surfaceId) const noexcept {
+  std::optional<SurfaceManager::SurfaceProps> surfaceProps;
+
+  visit(surfaceId, [&](const SurfaceHandler& surfaceHandler) {
+    surfaceProps = SurfaceManager::SurfaceProps{
+        surfaceId,
+        surfaceHandler.getModuleName(),
+        surfaceHandler.getProps(),
+        surfaceHandler.getLayoutConstraints(),
+        surfaceHandler.getLayoutContext()};
+  });
+
+  return surfaceProps;
+}
+
 Size SurfaceManager::measureSurface(
     SurfaceId surfaceId,
     const LayoutConstraints& layoutConstraints,
diff --git a/packages/react-native/ReactCommon/react/renderer/scheduler/SurfaceManager.h b/packages/react-native/ReactCommon/react/renderer/scheduler/SurfaceManager.h
index fd60f788cc0127..f04ea0e74b0019 100644
--- a/packages/react-native/ReactCommon/react/renderer/scheduler/SurfaceManager.h
+++ b/packages/react-native/ReactCommon/react/renderer/scheduler/SurfaceManager.h
@@ -8,6 +8,7 @@
 #pragma once
 
 #include <mutex>
+#include <optional>
 #include <shared_mutex>
 #include <unordered_map>
 
@@ -29,6 +30,15 @@ class SurfaceManager final {
   explicit SurfaceManager(const Scheduler& scheduler) noexcept;
   ~SurfaceManager() noexcept;
 
+  /* SurfaceProps contain information about running surfaces */
+  struct SurfaceProps {
+    SurfaceId surfaceId;
+    std::string moduleName;
+    folly::dynamic props;
+    LayoutConstraints layoutConstraints;
+    LayoutContext layoutContext;
+  };
+
 #pragma mark - Surface Management
 
   void startSurface(
@@ -47,6 +57,9 @@ class SurfaceManager final {
 
   void stopAllSurfaces() const noexcept;
 
+  std::optional<SurfaceManager::SurfaceProps> getSurfaceProps(
+      SurfaceId surfaceId) const noexcept;
+
   Size measureSurface(
       SurfaceId surfaceId,
       const LayoutConstraints& layoutConstraints,