1 files changed, 35 insertions, 0 deletions
diff --git a/src/SMAPI/Events/ItemStackSizeChange.cs b/src/SMAPI/Events/ItemStackSizeChange.cs
new file mode 100644
index 00000000..35369be2
--- /dev/null
+++ b/src/SMAPI/Events/ItemStackSizeChange.cs
@@ -0,0 +1,35 @@
+using StardewValley;
+
+namespace StardewModdingAPI.Events
+{
+    /// <summary>An inventory item stack size change.</summary>
+    public class ItemStackSizeChange
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The item whose stack size changed.</summary>
+        public Item Item { get; }
+
+        /// <summary>The previous stack size.</summary>
+        public int OldSize { get; }
+
+        /// <summary>The new stack size.</summary>
+        public int NewSize { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="item">The item whose stack size changed.</param>
+        /// <param name="oldSize">The previous stack size.</param>
+        /// <param name="newSize">The new stack size.</param>
+        public ItemStackSizeChange(Item item, int oldSize, int newSize)
+        {
+            this.Item = item;
+            this.OldSize = oldSize;
+            this.NewSize = newSize;
+        }
+    }
+}