add mouse scroll event (#310)

2 files changed, 41 insertions, 0 deletions

diff --git a/src/SMAPI/Events/IInputEvents.cs b/src/SMAPI/Events/IInputEvents.cs
index 938c772b..64d82c57 100644
--- a/src/SMAPI/Events/IInputEvents.cs
+++ b/src/SMAPI/Events/IInputEvents.cs
@@ -13,5 +13,8 @@ namespace StardewModdingAPI.Events
 
         /// <summary>Raised after the player moves the in-game cursor.</summary>
         event EventHandler<InputCursorMovedArgsInput> CursorMoved;
+
+        /// <summary>Raised after the player scrolls the mouse wheel.</summary>
+        event EventHandler<InputMouseWheelScrolledEventArgs> MouseWheelScrolled;
     }
 }
diff --git a/src/SMAPI/Events/InputMouseWheelScrolledEventArgs.cs b/src/SMAPI/Events/InputMouseWheelScrolledEventArgs.cs
new file mode 100644
index 00000000..9afab9cc
--- /dev/null
+++ b/src/SMAPI/Events/InputMouseWheelScrolledEventArgs.cs
@@ -0,0 +1,38 @@
+using System;
+
+namespace StardewModdingAPI.Events
+{
+    /// <summary>Event arguments when the player scrolls the mouse wheel.</summary>
+    public class InputMouseWheelScrolledEventArgs : EventArgs
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The cursor position.</summary>
+        public ICursorPosition Position { get; }
+
+        /// <summary>The old scroll value.</summary>
+        public int OldValue { get; }
+
+        /// <summary>The new scroll value.</summary>
+        public int NewValue { get; }
+
+        /// <summary>The amount by which the scroll value changed.</summary>
+        public int Delta => this.NewValue - this.OldValue;
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="position">The cursor position.</param>
+        /// <param name="oldValue">The old scroll value.</param>
+        /// <param name="newValue">The new scroll value.</param>
+        public InputMouseWheelScrolledEventArgs(ICursorPosition position, int oldValue, int newValue)
+        {
+            this.Position = position;
+            this.OldValue = oldValue;
+            this.NewValue = newValue;
+        }
+    }
+}