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node_modules/react-native/ReactCommon/react/renderer/uimanager/UIManagerMountHook.h

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+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <react/renderer/components/root/RootShadowNode.h>
+#include "UIManager.h"
+
+namespace facebook::react {
+
+class ShadowTree;
+class UIManager;
+
+/*
+ * Implementing a mount hook allows to observe Shadow Trees being mounted in
+ * the host platform.
+ */
+class UIManagerMountHook {
+ public:
+  /*
+   * Called right after a `ShadowTree` is mounted in the host platform.
+   */
+  virtual void shadowTreeDidMount(
+      const RootShadowNode::Shared &rootShadowNode,
+      HighResTimeStamp mountTime) noexcept = 0;
+
+  virtual void shadowTreeDidUnmount(SurfaceId /*surfaceId*/, HighResTimeStamp /*unmountTime*/) noexcept
+  {
+    // Default no-op implementation for backwards compatibility.
+  }
+
+  virtual ~UIManagerMountHook() noexcept = default;
+};
+
+} // namespace facebook::react