Merge pull request #12 from Frank-99/master

2019 final fix

Author: marijnz

Assets/ToolbarExtender/Scripts/Editor/ToolbarCallback.cs

@@ -2,7 +2,12 @@
 using UnityEngine;
 using UnityEditor;
 using System.Reflection;
+
+#if UNITY_2019_1_OR_NEWER
+using UnityEngine.UIElements;
+#else
 using UnityEngine.Experimental.UIElements;
+#endif
 
 namespace UnityToolbarExtender
 {
@@ -58,4 +63,4 @@ static void OnGUI()
 			if (handler != null) handler();
 		}
 	}
-}
+}

Assets/ToolbarExtender/Scripts/Editor/ToolbarExtender.cs

@@ -18,11 +18,18 @@ public static class ToolbarExtender
 		static ToolbarExtender()
 		{
 			Type toolbarType = typeof(Editor).Assembly.GetType("UnityEditor.Toolbar");
-			FieldInfo toolIcons = toolbarType.GetField("s_ShownToolIcons",
+			
+#if UNITY_2019_1_OR_NEWER
+			string fieldName = "k_ToolCount";
+#else
+			string fieldName = "s_ShownToolIcons";
+#endif
+			
+			FieldInfo toolIcons = toolbarType.GetField(fieldName,
 				BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Static);
 
 #if UNITY_2019_1_OR_NEWER
-			m_toolCount = 7;
+			m_toolCount = toolIcons != null ? ((int) toolIcons.GetValue(null)) : 7;
 #elif UNITY_2018_1_OR_NEWER
 			m_toolCount = toolIcons != null ? ((Array) toolIcons.GetValue(null)).Length : 6;
 #else