From 995d4b4c36575dd7d78ff16398265a18b2bca2d3 Mon Sep 17 00:00:00 2001
From: Andrew Datsenko <asd@meta.com>
Date: Tue, 30 Jul 2024 05:40:59 -0700
Subject: [PATCH] 
 xplat/js/react-native-github/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/layoutanimation/SimpleSpringInterpolator.java
 (#45739)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/45739

Changelog: [Internal]

Reviewed By: tdn120

Differential Revision: D60233508

fbshipit-source-id: fcf666cb5d2a935c85b0b4507739d002b58f8141
---
 .../SimpleSpringInterpolator.java             | 50 -------------------
 .../SimpleSpringInterpolator.kt               | 48 ++++++++++++++++++
 2 files changed, 48 insertions(+), 50 deletions(-)
 delete mode 100644 packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/layoutanimation/SimpleSpringInterpolator.java
 create mode 100644 packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/layoutanimation/SimpleSpringInterpolator.kt

diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/layoutanimation/SimpleSpringInterpolator.java b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/layoutanimation/SimpleSpringInterpolator.java
deleted file mode 100644
index 84cbe2ae9ca..00000000000
--- a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/layoutanimation/SimpleSpringInterpolator.java
+++ /dev/null
@@ -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.uimanager.layoutanimation;
-
-import android.view.animation.Interpolator;
-import com.facebook.infer.annotation.Nullsafe;
-import com.facebook.react.bridge.ReadableMap;
-import com.facebook.react.bridge.ReadableType;
-
-/** Simple spring interpolator */
-// TODO(7613736): Improve spring interpolator with friction and damping variable support
-/* package */ @Nullsafe(Nullsafe.Mode.LOCAL)
-class SimpleSpringInterpolator implements Interpolator {
-
-  private static final float FACTOR = 0.5f;
-  public static final String PARAM_SPRING_DAMPING = "springDamping";
-  private final float mSpringDamping;
-
-  public static float getSpringDamping(ReadableMap params) {
-    if (params.getType(PARAM_SPRING_DAMPING).equals(ReadableType.Number)) {
-      return (float) params.getDouble(PARAM_SPRING_DAMPING);
-    } else {
-      return FACTOR;
-    }
-  }
-
-  public SimpleSpringInterpolator() {
-    mSpringDamping = FACTOR;
-  }
-
-  public SimpleSpringInterpolator(float springDamping) {
-    mSpringDamping = springDamping;
-  }
-
-  @Override
-  public float getInterpolation(float input) {
-    // Using mSpringDamping in this equation is not really the exact mathematical springDamping, but
-    // a good approximation
-    // We need to replace this equation with the right Factor that accounts for damping and friction
-    return (float)
-        (1
-            + Math.pow(2, -10 * input)
-                * Math.sin((input - mSpringDamping / 4) * Math.PI * 2 / mSpringDamping));
-  }
-}
diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/layoutanimation/SimpleSpringInterpolator.kt b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/layoutanimation/SimpleSpringInterpolator.kt
new file mode 100644
index 00000000000..1be3ade96c7
--- /dev/null
+++ b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/layoutanimation/SimpleSpringInterpolator.kt
@@ -0,0 +1,48 @@
+/*
+ * 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.uimanager.layoutanimation
+
+import android.view.animation.Interpolator
+import com.facebook.react.bridge.ReadableMap
+import com.facebook.react.bridge.ReadableType
+import com.facebook.react.bridge.ReadableType.Number
+
+/** Simple spring interpolator */
+// TODO(7613736): Improve spring interpolator with friction and damping variable support
+/* package */
+internal class SimpleSpringInterpolator : Interpolator {
+  private val _springDamping: Float
+
+  @JvmOverloads
+  public constructor(springDamping: Float = FACTOR) {
+    _springDamping = springDamping
+  }
+
+  override public fun getInterpolation(input: Float): Float =
+      // Using mSpringDamping in this equation is not really the exact mathematical springDamping,
+      // but a good approximation
+      // We need to replace this equation with the right Factor that accounts for damping and
+      // friction
+      (1 +
+              Math.pow(2.0, (-10 * input).toDouble()) *
+                  Math.sin((input - _springDamping / 4) * Math.PI * 2 / _springDamping))
+          .toFloat()
+
+  public companion object {
+    private const val FACTOR = 0.5f
+    public const val PARAM_SPRING_DAMPING: String = "springDamping"
+
+    @JvmStatic
+    public fun getSpringDamping(params: ReadableMap): Float =
+        if (params.getType(PARAM_SPRING_DAMPING) == ReadableType.Number) {
+          params.getDouble(PARAM_SPRING_DAMPING).toFloat()
+        } else {
+          FACTOR
+        }
+  }
+}