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Assets/Scripts/ObjectQ.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+//Handle Objects in Queue
+public class ObjectQ : MonoBehaviour
+{
+    //all objects in the Q(ueue) are stored here
+    [SerializeField]
+    private List<QableObject> queue = new List<QableObject>();
+    [SerializeField]
+    private Material material;
+
+    private QableObject currentObject = null;
+    private int currentIndex = 0;
+    private State currentState = State.Changing;
+    
+
+    //switch to next or previous object in Q
+    public void Change(bool previous = false)
+    {
+        if(queue.Count < 2 || currentState != State.ViewMode)
+            return;
+
+        currentIndex = previous ? currentIndex - 1 : currentIndex + 1;
+        currentIndex = (currentIndex + queue.Count) % queue.Count;
+        StartCoroutine(ShowNext());
+        currentState = State.Changing;
+    }
+
+    //add Object to Q
+    public void Add(GameObject gameObject)
+    {
+        var o = gameObject.AddComponent<QableObject>();
+        gameObject.transform.SetParent(transform);
+        gameObject.transform.position = transform.position;
+        o.renderer.material = material;
+
+        queue.Add(o);
+        
+        //if no object is currently visible then show the first object in Q
+        if(currentObject == null)
+            StartCoroutine(ShowNext());
+    }
+
+    //Show next object from currentIndex
+    private IEnumerator ShowNext()
+    {
+        if(currentObject != null)
+            yield return StartCoroutine(currentObject.Dissolve());
+        
+        currentObject = queue[currentIndex];
+        StartCoroutine(currentObject.Dissolve(true));
+        currentState = State.ViewMode;
+    }
+
+    
+    //States of ObjectQ
+    public enum State
+    {
+        ViewMode,
+        Changing
+    }
+    
+}
+
+