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Assets/Oculus/Interaction/Runtime/Scripts/Extensions/MonoBehaviourStartExtensions.cs

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+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * Licensed under the Oculus SDK License Agreement (the "License");
+ * you may not use the Oculus SDK except in compliance with the License,
+ * which is provided at the time of installation or download, or which
+ * otherwise accompanies this software in either electronic or hard copy form.
+ *
+ * You may obtain a copy of the License at
+ *
+ * https://developer.oculus.com/licenses/oculussdk/
+ *
+ * Unless required by applicable law or agreed to in writing, the Oculus SDK
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System;
+using UnityEngine;
+
+namespace Oculus.Interaction
+{
+    /// <summary>
+    /// By adding BeginStart and EndStart at the beginning and end of Start, MonoBehaviours with
+    /// OnEnable and OnDisable logic can wrap their contents within a _started flag and effectively
+    /// skip over logic in those methods until after Start has been invoked.
+    ///
+    /// To not bypass the Unity Lifecycle, the enabled property is used to disable the most derived
+    /// MonoBehaviour, invoke Start up the hierarchy chain, and finally re-enable the MonoBehaviour.
+    /// </summary>
+    public static class MonoBehaviourStartExtensions
+    {
+        public static void BeginStart(this MonoBehaviour monoBehaviour, ref bool started,
+                                      Action baseStart = null)
+        {
+            if (!started)
+            {
+                monoBehaviour.enabled = false;
+                started = true;
+                baseStart?.Invoke();
+                started = false;
+            }
+            else
+            {
+                baseStart?.Invoke();
+            }
+        }
+
+        public static void EndStart(this MonoBehaviour monoBehaviour, ref bool started)
+        {
+            if (!started)
+            {
+                started = true;
+                monoBehaviour.enabled = true;
+            }
+        }
+    }
+}