From ac41e017d85696914b8ac5f06f985205bae17115 Mon Sep 17 00:00:00 2001
From: "Frank A. Krueger" <fak@praeclarum.org>
Date: Wed, 18 Apr 2018 17:14:21 -0700
Subject: [PATCH] Implement INotifyPropertyChanged

---
 Ooui/EventTarget.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Ooui/EventTarget.cs b/Ooui/EventTarget.cs
index 84ee2f0..c2bee13 100644
--- a/Ooui/EventTarget.cs
+++ b/Ooui/EventTarget.cs
@@ -2,11 +2,12 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
+using System.ComponentModel;
 
 namespace Ooui
 {
     [Newtonsoft.Json.JsonConverter (typeof (EventTargetJsonConverter))]
-    public abstract class EventTarget
+    public abstract class EventTarget : INotifyPropertyChanged
     {
         readonly List<Message> stateMessages = new List<Message> ();
 
@@ -17,6 +18,8 @@ namespace Ooui
 
         public string TagName { get; private set; }
 
+        public event PropertyChangedEventHandler PropertyChanged;
+
         public event Action<Message> MessageSent;
 
         public IReadOnlyList<Message> StateMessages {
@@ -96,6 +99,7 @@ namespace Ooui
 
         protected virtual void OnPropertyChanged (string propertyName)
         {
+            PropertyChanged?.Invoke (this, new PropertyChangedEventArgs (propertyName));
         }
 
         public const char IdPrefix = '\u2999';