update

Packages/app.rive.rive-unity/Runtime/DataBinding/ViewModelInstanceProperty.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Concurrent;
+
+namespace Rive
+{
+    /// <summary>
+    /// Base class representing any value that can be a property of a ViewModelInstance.
+    /// This includes both primitive property values and nested view model instances.
+    /// </summary>
+    public abstract class ViewModelInstanceProperty
+    {
+        /// <summary>
+        /// Cache of property instances to avoid creating multiple instances for the same native property
+        /// </summary>
+        private static readonly ConcurrentDictionary<IntPtr, WeakReference<ViewModelInstanceProperty>> s_propertiesCache =
+            new ConcurrentDictionary<IntPtr, WeakReference<ViewModelInstanceProperty>>();
+
+        /// <summary>
+        /// Adds a globally cached view model property for a given pointer.
+        /// </summary>
+        /// <param name="ptr"> The pointer to the property.</param>
+        /// <param name="property"> The C# property to cache.</param>
+        internal static void AddGloballyCachedVMPropertyForPointer(IntPtr ptr, ViewModelInstanceProperty property)
+        {
+            s_propertiesCache[ptr] = new WeakReference<ViewModelInstanceProperty>(property);
+        }
+
+        /// <summary>
+        /// Tries to get a globally cached view model property for a given pointer.
+        /// </summary>
+        /// <param name="ptr"> The pointer to the property.</param>
+        /// <param name="property"> The C# property to cache.</param>
+        /// <returns></returns>
+        internal static bool TryGetGloballyCachedVMPropertyForPointer(IntPtr ptr, out ViewModelInstanceProperty property)
+        {
+            if (s_propertiesCache.TryGetValue(ptr, out var weakReference) &&
+                weakReference.TryGetTarget(out property))
+            {
+                return true;
+            }
+
+            property = null;
+            return false;
+        }
+
+        /// <summary>
+        /// Removes a cached view model property for a given pointer.
+        /// /// </summary>
+        /// <param name="ptr"> The pointer to the property.</param>
+        internal static void RemoveCachedPropertyForPointer(IntPtr ptr)
+        {
+            s_propertiesCache.TryRemove(ptr, out _);
+        }
+    }
+}