From 0f4a14a4c2968b212a4109cfc1eb89867cab1bdc Mon Sep 17 00:00:00 2001
From: Jose Medrano <josmed@microsoft.com>
Date: Wed, 16 Feb 2022 18:18:33 +0100
Subject: Creates ProxyRowResponder manage responder between rows in
 NSOutlineView

---
 .../Controls/ProxyRowResponder.cs                  | 48 ++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 Xamarin.PropertyEditing.Mac/Controls/ProxyRowResponder.cs

diff --git a/Xamarin.PropertyEditing.Mac/Controls/ProxyRowResponder.cs b/Xamarin.PropertyEditing.Mac/Controls/ProxyRowResponder.cs
new file mode 100644
index 0000000..6f0784e
--- /dev/null
+++ b/Xamarin.PropertyEditing.Mac/Controls/ProxyRowResponder.cs
@@ -0,0 +1,48 @@
+using System;
+
+namespace Xamarin.PropertyEditing.Mac
+{
+	internal enum ProxyRowType
+	{
+		SingleView,
+		FirstView,
+		LastView
+	}
+
+	internal class ProxyRowResponder
+	{
+		protected WeakReference<PropertyEditorControl> editorControl;
+
+		readonly ProxyRowType rowType;
+
+		public ProxyRowResponder (PropertyEditorControl editorControl, ProxyRowType rowType)
+		{
+			this.rowType = rowType;
+			this.editorControl = new WeakReference<PropertyEditorControl> (editorControl);
+		}
+
+		public bool NextResponder()
+		{
+			if (this.editorControl.TryGetTarget (out var editor))
+			{
+				if (this.rowType == ProxyRowType.LastView || this.rowType == ProxyRowType.SingleView) {
+					editor.OnNextResponderRequested ();
+					return true;
+				}
+			}
+			return false;
+		}
+
+		public bool PreviousResponder ()
+		{
+			if (this.editorControl.TryGetTarget (out var editor))
+			{
+				if (this.rowType == ProxyRowType.FirstView || this.rowType == ProxyRowType.SingleView) {
+					editor.OnPreviousResponderRequested ();
+					return true;
+				}
+			}
+			return false;
+		}
+	}
+}
-- 
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