Expose the backend via UIManager

Differential Revision: D81137954

Author: Bartlomiej Bloniarz

packages/react-native/ReactCommon/react/renderer/animated/NativeAnimatedNodesManagerProvider.cpp

@@ -66,13 +66,17 @@ NativeAnimatedNodesManagerProvider::getOrCreate(
         };
 
     if (ReactNativeFeatureFlags::useSharedAnimatedBackend()) {
+      // TODO: this should be initialized outside of animated, but for now it
+      // was convenient to do it here
       animationBackend_ = std::make_shared<AnimationBackend>(
           std::move(startOnRenderCallback_),
           std::move(stopOnRenderCallback_),
           std::move(directManipulationCallback));
 
       nativeAnimatedNodesManager_ =
           std::make_shared<NativeAnimatedNodesManager>(animationBackend_);
+
+      uiManager->setAnimationBackend(animationBackend_);
     } else {
       nativeAnimatedNodesManager_ =
           std::make_shared<NativeAnimatedNodesManager>(

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

@@ -678,6 +678,15 @@ void UIManager::setNativeAnimatedDelegate(
   nativeAnimatedDelegate_ = delegate;
 }
 
+void UIManager::setAnimationBackend(
+    std::shared_ptr<AnimationBackend> animationBackend) {
+  animationBackend_ = animationBackend;
+}
+
+std::shared_ptr<AnimationBackend> UIManager::getAnimationBackend() {
+  return animationBackend_;
+}
+
 void UIManager::animationTick() const {
   if (animationDelegate_ != nullptr &&
       animationDelegate_->shouldAnimateFrame()) {

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

@@ -36,6 +36,7 @@ namespace facebook::react {
 class UIManagerBinding;
 class UIManagerCommitHook;
 class UIManagerMountHook;
+class AnimationBackend;
 
 class UIManager final : public ShadowTreeDelegate {
  public:
@@ -55,13 +56,16 @@ class UIManager final : public ShadowTreeDelegate {
    */
   void setDelegate(UIManagerDelegate* delegate);
   UIManagerDelegate* getDelegate();
+  std::shared_ptr<AnimationBackend> animationBackend_;
 
   /**
    * Sets and gets the UIManager's Animation APIs delegate.
    * The delegate is stored as a raw pointer, so the owner must null
    * the pointer before being destroyed.
    */
   void setAnimationDelegate(UIManagerAnimationDelegate* delegate);
+  void setAnimationBackend(std::shared_ptr<AnimationBackend> animationBackend);
+  std::shared_ptr<AnimationBackend> getAnimationBackend();
 
   /**
    * Execute stopSurface on any UIMAnagerAnimationDelegate.