From ee7d9e8424294575ef8ce8f52240fb306fd90e62 Mon Sep 17 00:00:00 2001
From: reddyashish <43763136+reddyashish@users.noreply.github.com>
Date: Thu, 12 Nov 2020 00:57:45 -0500
Subject: [PATCH] Public event for view extensions indicating a close action on
 the sidebar.

---
 src/DynamoCoreWpf/Extensions/ViewLoadedParams.cs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/DynamoCoreWpf/Extensions/ViewLoadedParams.cs b/src/DynamoCoreWpf/Extensions/ViewLoadedParams.cs
index a24629a431b..4433a4a8790 100644
--- a/src/DynamoCoreWpf/Extensions/ViewLoadedParams.cs
+++ b/src/DynamoCoreWpf/Extensions/ViewLoadedParams.cs
@@ -83,6 +83,7 @@ internal ViewLoadedParams(DynamoView dynamoV, DynamoViewModel dynamoVM) :
             dynamoMenu = dynamoView.titleBar.ChildOfType<Menu>();
             ViewStartupParams = new ViewStartupParams(dynamoVM);
             DynamoSelection.Instance.Selection.CollectionChanged += OnSelectionCollectionChanged;
+            DynamoView.CloseExtension += OnViewExtensionClosed;
         }
 
         public void AddMenuItem(MenuBarType type, MenuItem menuItem, int index = -1)
@@ -147,6 +148,18 @@ private void OnSelectionCollectionChanged(object sender, NotifyCollectionChanged
             }
         }
 
+        /// <summary>
+        /// Event raised when the view extension is closed.
+        /// </summary>
+        public event Action<String> ViewExtensionClosed;
+        private void OnViewExtensionClosed(String extensionTabName)
+        {
+            if (ViewExtensionClosed != null)
+            {
+                ViewExtensionClosed(extensionTabName);
+            }
+        }
+
         private void AddItemToMenu(MenuBarType type, Control itemToAdd, int index)
         {
             if (dynamoMenu == null) return;