1 files changed, 46 insertions, 0 deletions

diff --git a/src/Editor/Text/Def/TextUICocoa/Input/InputEventArgs.cs b/src/Editor/Text/Def/TextUICocoa/Input/InputEventArgs.cs
new file mode 100644
index 0000000..6603af3
--- /dev/null
+++ b/src/Editor/Text/Def/TextUICocoa/Input/InputEventArgs.cs
@@ -0,0 +1,46 @@
+//
+//  Copyright (c) Microsoft Corporation. All rights reserved.
+//  Licensed under the MIT License. See License.txt in the project root for license information.
+//
+
+using System;
+
+using AppKit;
+
+namespace Microsoft.VisualStudio.Text.Editor
+{
+    /// <summary>
+    /// Base class wrapping a native <see cref="NSEvent"/> input event
+    /// that allows for indicating that the event has been handled.
+    /// </summary>
+    public abstract class InputEventArgs : EventArgs
+    {
+        /// <summary>
+        /// The event thas is being processed.
+        /// </summary>
+        public NSEvent Event { get; }
+
+        /// <summary>
+        /// The type of event that is being processed.
+        /// </summary>
+        public NSEventType Type => Event.Type;
+
+        /// <summary>
+        /// Modifier flags for the event.
+        /// </summary>
+        public NSEventModifierMask ModifierFlags => Event.ModifierFlags;
+
+        /// <summary>
+        /// Destination window for the event.
+        /// </summary>
+        public NSWindow Window => Event.Window;
+
+        /// <summary>
+        /// Whether or not this event has been handled.
+        /// </summary>
+        public bool Handled { get; set; }
+
+        private protected InputEventArgs(NSEvent @event)
+            => Event = @event ?? throw new ArgumentNullException(nameof(@event));
+    }
+}
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