From 2cc77f42cd02f670391eff94564b4b1248d792ac Mon Sep 17 00:00:00 2001
From: Ellpeck <me@ellpeck.de>
Date: Tue, 8 Jun 2021 21:36:42 +0200
Subject: [PATCH] added events for when a root element is added or removed from
 a ui

---
 MLEM.Ui/UiSystem.cs | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/MLEM.Ui/UiSystem.cs b/MLEM.Ui/UiSystem.cs
index 8439b72..6caceaa 100644
--- a/MLEM.Ui/UiSystem.cs
+++ b/MLEM.Ui/UiSystem.cs
@@ -268,6 +268,7 @@ namespace MLEM.Ui {
                 e.SetAreaDirty();
             });
             this.OnRootAdded?.Invoke(root);
+            root.OnAddedToUi?.Invoke(this);
             this.SortRoots();
             return root;
         }
@@ -289,6 +290,7 @@ namespace MLEM.Ui {
                 e.SetAreaDirty();
             });
             this.OnRootRemoved?.Invoke(root);
+            root.OnRemovedFromUi?.Invoke(this);
         }
 
         /// <summary>
@@ -417,9 +419,17 @@ namespace MLEM.Ui {
         /// </summary>
         public Element.GenericCallback OnElementAdded;
         /// <summary>
-        /// Even that is invoked when a <see cref="Element"/> is removed rom this root element of any of its children.
+        /// Event that is invoked when a <see cref="Element"/> is removed rom this root element of any of its children.
         /// </summary>
         public Element.GenericCallback OnElementRemoved;
+        /// <summary>
+        /// Event that is invoked when this <see cref="RootElement"/> gets added to a <see cref="UiSystem"/> in <see cref="UiSystem.Add"/> 
+        /// </summary>
+        public Action<UiSystem> OnAddedToUi;
+        /// <summary>
+        /// Event that is invoked when this <see cref="RootElement"/> gets removed from a <see cref="UiSystem"/> in <see cref="UiSystem.Remove"/> 
+        /// </summary>
+        public Action<UiSystem> OnRemovedFromUi;
 
         internal RootElement(string name, Element element, UiSystem system) {
             this.Name = name;