From 3dcbf9112b1ed1026d0965f6117990c680a4e944 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dino=20Fejzagi=C4=87?= <dino.f@live.de>
Date: Tue, 19 Dec 2023 19:54:58 +0100
Subject: [PATCH] Add Copy API for joint provider (#105)

---
 Runtime/Input/Hands/HandJointTransformProvider.cs  | 14 ++++++++++++++
 Runtime/Input/Hands/IHandJointTransformProvider.cs |  6 ++++++
 2 files changed, 20 insertions(+)

diff --git a/Runtime/Input/Hands/HandJointTransformProvider.cs b/Runtime/Input/Hands/HandJointTransformProvider.cs
index 93ea3f2d..c580d722 100644
--- a/Runtime/Input/Hands/HandJointTransformProvider.cs
+++ b/Runtime/Input/Hands/HandJointTransformProvider.cs
@@ -48,6 +48,20 @@ private void UpdateCache()
 
         private void InvalidateCache() => Cache.Clear();
 
+        /// <inheritdoc/>
+        public void Copy(IHandJointTransformProvider sourceProvider)
+        {
+            var jointCount = Enum.GetNames(typeof(HandJoint)).Length;
+            for (var i = 0; i < jointCount; i++)
+            {
+                var joint = (HandJoint)i;
+                if (sourceProvider.TryGetTransform(joint, out var transform))
+                {
+                    SetTransform(joint, transform);
+                }
+            }
+        }
+
         /// <inheritdoc/>
         public void SetTransform(HandJoint joint, Transform transform)
         {
diff --git a/Runtime/Input/Hands/IHandJointTransformProvider.cs b/Runtime/Input/Hands/IHandJointTransformProvider.cs
index a4079197..37cf9597 100644
--- a/Runtime/Input/Hands/IHandJointTransformProvider.cs
+++ b/Runtime/Input/Hands/IHandJointTransformProvider.cs
@@ -18,6 +18,12 @@ public interface IHandJointTransformProvider
         /// </summary>
         event Action JointTransformsChanged;
 
+        /// <summary>
+        /// Copies all joint <see cref="Transform"/> information from the <paramref name="sourceProvider"/>.
+        /// </summary>
+        /// <param name="sourceProvider">The <see cref="IHandJointTransformProvider"/> to copy from.</param>
+        void Copy(IHandJointTransformProvider sourceProvider);
+
         /// <summary>
         /// Sets the <see cref="Transform"/> for a given <see cref="HandJoint"/>.
         /// </summary>