Migrate TrackingAnimatedNode.java to Kotlin (#45656)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/45656

TrackingAnimatedNode.java -> TrackingAnimatedNode.kt

changelog: [internal] internal

Reviewed By: rshest

Differential Revision: D60080041

fbshipit-source-id: b78070783cb24d4aed43827fdc866e6f9bb5a1bc

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/animated/TrackingAnimatedNode.java

@@ -1,50 +0,0 @@
-/*
- * 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.
- */
-
-package com.facebook.react.animated;
-
-import com.facebook.react.bridge.JavaOnlyMap;
-import com.facebook.react.bridge.ReadableMap;
-
-/* package */ class TrackingAnimatedNode extends AnimatedNode {
-
-  private final NativeAnimatedNodesManager mNativeAnimatedNodesManager;
-  private final int mAnimationId;
-  private final int mToValueNode;
-  private final int mValueNode;
-  private final JavaOnlyMap mAnimationConfig;
-
-  TrackingAnimatedNode(ReadableMap config, NativeAnimatedNodesManager nativeAnimatedNodesManager) {
-    mNativeAnimatedNodesManager = nativeAnimatedNodesManager;
-    mAnimationId = config.getInt("animationId");
-    mToValueNode = config.getInt("toValue");
-    mValueNode = config.getInt("value");
-    mAnimationConfig = JavaOnlyMap.deepClone(config.getMap("animationConfig"));
-  }
-
-  @Override
-  public void update() {
-    AnimatedNode toValue = mNativeAnimatedNodesManager.getNodeById(mToValueNode);
-    mAnimationConfig.putDouble("toValue", ((ValueAnimatedNode) toValue).getValue());
-    mNativeAnimatedNodesManager.startAnimatingNode(
-        mAnimationId, mValueNode, mAnimationConfig, null);
-  }
-
-  @Override
-  public String prettyPrint() {
-    return "TrackingAnimatedNode["
-        + tag
-        + "]: animationID: "
-        + mAnimationId
-        + " toValueNode: "
-        + mToValueNode
-        + " valueNode: "
-        + mValueNode
-        + " animationConfig: "
-        + mAnimationConfig;
-  }
-}

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/animated/TrackingAnimatedNode.kt

@@ -0,0 +1,36 @@
+/*
+ * 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.
+ */
+
+package com.facebook.react.animated
+
+import com.facebook.react.bridge.JavaOnlyMap
+import com.facebook.react.bridge.ReadableMap
+
+internal class TrackingAnimatedNode(
+    config: ReadableMap,
+    private val nativeAnimatedNodesManager: NativeAnimatedNodesManager
+) : AnimatedNode() {
+  private val animationId: Int = config.getInt("animationId")
+  private val toValueNode: Int = config.getInt("toValue")
+  private val valueNode: Int = config.getInt("value")
+  private val animationConfig: JavaOnlyMap = JavaOnlyMap.deepClone(config.getMap("animationConfig"))
+
+  public override fun update() {
+    val toValue = nativeAnimatedNodesManager.getNodeById(toValueNode)
+    val valAnimatedNode = toValue as? ValueAnimatedNode
+    if (valAnimatedNode != null) {
+      animationConfig.putDouble("toValue", valAnimatedNode.getValue())
+    } else {
+      animationConfig.putNull("toValue")
+    }
+    nativeAnimatedNodesManager.startAnimatingNode(animationId, valueNode, animationConfig, null)
+  }
+
+  public override fun prettyPrint(): String =
+      "TrackingAnimatedNode[$tag]: animationID: $animationId toValueNode: $toValueNode " +
+          "valueNode: $valueNode animationConfig: $animationConfig"
+}