From af1918d5454a9dd560a2bd353e2a119dabe75d4c Mon Sep 17 00:00:00 2001
From: Ellpeck <megamaximal@gmail.com>
Date: Wed, 20 May 2020 00:48:53 +0200
Subject: [PATCH] added child addition and removal callbacks

---
 MLEM.Ui/Elements/Element.cs | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/MLEM.Ui/Elements/Element.cs b/MLEM.Ui/Elements/Element.cs
index 920c162..f2089d1 100644
--- a/MLEM.Ui/Elements/Element.cs
+++ b/MLEM.Ui/Elements/Element.cs
@@ -152,6 +152,8 @@ namespace MLEM.Ui.Elements {
         public OtherElementCallback OnSelectedElementChanged;
         public TabNextElementCallback GetTabNextElement;
         public GamepadNextElementCallback GetGamepadNextElement;
+        public OtherElementCallback OnChildAdded;
+        public OtherElementCallback OnChildRemoved;
 
         public StyleProp<NinePatch> SelectionIndicator;
         public StyleProp<SoundEffectInstance> ActionSound;
@@ -179,8 +181,8 @@ namespace MLEM.Ui.Elements {
             element.AndChildren(e => {
                 e.Root = this.Root;
                 e.System = this.System;
-                if (this.Root != null)
-                    this.Root.OnElementAdded(e);
+                this.Root?.OnElementAdded(e);
+                this.OnChildAdded?.Invoke(this, e);
             });
             this.SetSortedChildrenDirty();
             element.SetAreaDirty();
@@ -196,8 +198,8 @@ namespace MLEM.Ui.Elements {
             element.AndChildren(e => {
                 e.Root = null;
                 e.System = null;
-                if (this.Root != null)
-                    this.Root.OnElementRemoved(e);
+                this.Root?.OnElementRemoved(e);
+                this.OnChildRemoved?.Invoke(this, e);
             });
             this.SetSortedChildrenDirty();
         }