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Assets/Samples/Crest/5.4.2/Examples/Scripts/ExamplesController.cs

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+// Crest Water System
+// Copyright © 2024 Wave Harmonic. All rights reserved.
+
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+
+namespace WaveHarmonic.Crest.Examples
+{
+#if !CREST_DEBUG
+    [AddComponentMenu("")]
+#endif
+    sealed class ExamplesController : MonoBehaviour
+    {
+        [@DecoratedField, SerializeField]
+        KeyCode _Previous = KeyCode.Comma;
+
+        [@DecoratedField, SerializeField]
+        KeyCode _Next = KeyCode.Period;
+
+        [SerializeField]
+        List<GameObject> _Prefabs = new();
+
+        int _Index = 0;
+
+        public void Previous() => Cycle(true);
+        public void Next() => Cycle(false);
+
+        void OnEnable()
+        {
+            if (_Prefabs.Count == 0)
+            {
+                enabled = false;
+                return;
+            }
+
+            var prefab = Instantiate(_Prefabs[_Index]);
+            prefab.transform.SetParent(transform, worldPositionStays: true);
+        }
+
+        void OnDisable()
+        {
+            var child = transform.GetChild(0);
+            if (child == null)
+            {
+                return;
+            }
+
+            Destroy(child.gameObject);
+        }
+
+        void Update()
+        {
+            if (Input.GetKeyUp(_Previous))
+            {
+                Previous();
+            }
+            else if (Input.GetKeyUp(_Next))
+            {
+                Next();
+            }
+        }
+
+        internal void Cycle(bool isReverse = false)
+        {
+            _Index += isReverse ? -1 : 1;
+
+            // Wrap index.
+            if (_Index < 0) _Index = _Prefabs.Count - 1;
+            if (_Index == _Prefabs.Count) _Index = 0;
+
+            var go = transform.GetChild(0).gameObject;
+            go.SetActive(false);
+
+            Helpers.Destroy(go);
+
+            var prefab = Instantiate(_Prefabs[_Index]);
+            prefab.transform.SetParent(transform, worldPositionStays: true);
+        }
+    }
+
+#if UNITY_EDITOR
+    [CustomEditor(typeof(ExamplesController))]
+    sealed class ExamplesControllerEditor : Editor.Inspector
+    {
+        protected override void RenderInspectorGUI()
+        {
+            base.RenderInspectorGUI();
+
+            var target = this.target as ExamplesController;
+
+            if (GUILayout.Button("Previous"))
+            {
+                target.Previous();
+            }
+
+            if (GUILayout.Button("Next"))
+            {
+                target.Next();
+            }
+        }
+    }
+#endif
+}