Unity Project

reference
https://cardgames.io/yahtzee/

Library/PackageCache/com.unity.timeline@1.2.15/Editor/Signals/SignalAssetInspector.cs

@@ -0,0 +1,28 @@
+using JetBrains.Annotations;
+using UnityEngine;
+using UnityEngine.Timeline;
+
+namespace UnityEditor.Timeline.Signals
+{
+    [CustomEditor(typeof(SignalAsset))]
+    class SignalAssetInspector : Editor
+    {
+        [MenuItem("Assets/Create/Signal", false, 451)]
+        [UsedImplicitly]
+        public static void CreateNewSignal()
+        {
+            var icon = EditorGUIUtility.IconContent("SignalAsset Icon").image as Texture2D;
+            ProjectWindowUtil.StartNameEditingIfProjectWindowExists(0, CreateInstance<DoCreateSignalAsset>(), "New Signal.signal", icon, null);
+        }
+
+        class DoCreateSignalAsset : ProjectWindowCallback.EndNameEditAction
+        {
+            public override void Action(int instanceId, string pathName, string resourceFile)
+            {
+                var signalAsset = CreateInstance<SignalAsset>();
+                AssetDatabase.CreateAsset(signalAsset, pathName);
+                ProjectWindowUtil.ShowCreatedAsset(signalAsset);
+            }
+        }
+    }
+}