Add Fantom.getFabricUpdateProps (#52108)

Summary:
Pull Request resolved: #52108

## Changelog:

[General] [Added] - Add Fantom.getFabricUpdateProps

For reading fabric update props scheduled via `UIManager::updateShadowTree`

Reviewed By: rshest

Differential Revision: D76857429

fbshipit-source-id: d19312d0b1c6460258a7949054e66313f05afdbf

Author: zeyap

packages/react-native/React/Fabric/RCTScheduler.mm

@@ -72,6 +72,12 @@ void schedulerShouldSynchronouslyUpdateViewOnUIThread(facebook::react::Tag tag,
     [scheduler.delegate schedulerDidSynchronouslyUpdateViewOnUIThread:tag props:props];
   }
 
+  void schedulerDidUpdateShadowTree(const std::unordered_map<Tag, folly::dynamic> &tagToProps) override
+  {
+    // Does nothing.
+    // This delegate method is not currently used on iOS.
+  }
+
  private:
   void *scheduler_;
 };

packages/react-native/ReactAndroid/src/main/jni/react/fabric/FabricUIManagerBinding.cpp

@@ -722,6 +722,11 @@ void FabricUIManagerBinding::schedulerShouldSynchronouslyUpdateViewOnUIThread(
   }
 }
 
+void FabricUIManagerBinding::schedulerDidUpdateShadowTree(
+    const std::unordered_map<Tag, folly::dynamic>& /*tagToProps*/) {
+  // no-op
+}
+
 void FabricUIManagerBinding::onAnimationStarted() {
   auto mountingManager = getMountingManager("onAnimationStarted");
   if (!mountingManager) {

packages/react-native/ReactAndroid/src/main/jni/react/fabric/FabricUIManagerBinding.h

@@ -126,6 +126,9 @@ class FabricUIManagerBinding : public jni::HybridClass<FabricUIManagerBinding>,
       Tag tag,
       const folly::dynamic& props) override;
 
+  void schedulerDidUpdateShadowTree(
+      const std::unordered_map<Tag, folly::dynamic>& tagToProps) override;
+
   void setPixelDensity(float pointScaleFactor);
 
   void driveCxxAnimations();

packages/react-native/ReactCommon/react/renderer/scheduler/Scheduler.cpp

@@ -320,6 +320,13 @@ void Scheduler::uiManagerShouldSynchronouslyUpdateViewOnUIThread(
   }
 }
 
+void Scheduler::uiManagerDidUpdateShadowTree(
+    const std::unordered_map<Tag, folly::dynamic>& tagToProps) {
+  if (delegate_ != nullptr) {
+    delegate_->schedulerDidUpdateShadowTree(tagToProps);
+  }
+}
+
 void Scheduler::uiManagerShouldAddEventListener(
     std::shared_ptr<const EventListener> listener) {
   addEventListener(listener);

packages/react-native/ReactCommon/react/renderer/scheduler/Scheduler.h

@@ -97,6 +97,8 @@ class Scheduler final : public UIManagerDelegate {
   void uiManagerShouldSynchronouslyUpdateViewOnUIThread(
       Tag tag,
       const folly::dynamic& props) override;
+  void uiManagerDidUpdateShadowTree(
+      const std::unordered_map<Tag, folly::dynamic>& tagToProps) override;
   void uiManagerShouldAddEventListener(
       std::shared_ptr<const EventListener> listener) final;
   void uiManagerShouldRemoveEventListener(

packages/react-native/ReactCommon/react/renderer/scheduler/SchedulerDelegate.h

@@ -68,6 +68,9 @@ class SchedulerDelegate {
       Tag tag,
       const folly::dynamic& props) = 0;
 
+  virtual void schedulerDidUpdateShadowTree(
+      const std::unordered_map<Tag, folly::dynamic>& tagToProps) = 0;
+
   virtual ~SchedulerDelegate() noexcept = default;
 };
 

packages/react-native/ReactCommon/react/renderer/uimanager/UIManagerDelegate.h

@@ -66,6 +66,12 @@ class UIManagerDelegate {
       Tag tag,
       const folly::dynamic& props) = 0;
 
+  /*
+   * Called after updateShadowTree is invoked.
+   */
+  virtual void uiManagerDidUpdateShadowTree(
+      const std::unordered_map<Tag, folly::dynamic>& tagToProps) = 0;
+
   /*
    * Add event listener.
    */

packages/react-native/ReactCommon/react/renderer/uimanager/UIManagerUpdateShadowTree.cpp

@@ -218,6 +218,10 @@ void UIManager::updateShadowTree(
       LOG(ERROR) << "Root ShadowNode has not been cloned";
     }
   });
+
+  if (delegate_ != nullptr) {
+    delegate_->uiManagerDidUpdateShadowTree(tagToProps);
+  }
 }
 
 } // namespace facebook::react

packages/react-native/ReactCxxPlatform/react/renderer/scheduler/SchedulerDelegateImpl.cpp

@@ -58,4 +58,9 @@ void SchedulerDelegateImpl::schedulerShouldSynchronouslyUpdateViewOnUIThread(
   mountingManager_->synchronouslyUpdateViewOnUIThread(tag, props);
 }
 
+void SchedulerDelegateImpl::schedulerDidUpdateShadowTree(
+    const std::unordered_map<Tag, folly::dynamic>& tagToProps) {
+  mountingManager_->onUpdateShadowTree(tagToProps);
+}
+
 } // namespace facebook::react

packages/react-native/ReactCxxPlatform/react/renderer/scheduler/SchedulerDelegateImpl.h

@@ -56,6 +56,9 @@ class SchedulerDelegateImpl : public SchedulerDelegate {
       Tag tag,
       const folly::dynamic& props) override;
 
+  void schedulerDidUpdateShadowTree(
+      const std::unordered_map<Tag, folly::dynamic>& tagToProps) override;
+
   std::shared_ptr<IMountingManager> mountingManager_;
 };