Base Scene

Assets/Scripts/UI/Canvas/CanvasFader.cs

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+using Exsersewo.Nydaliv.Extensions;
+using System.Collections;
+using UnityEngine;
+
+namespace Exsersewo.UI.Canvas
+{
+    public class CanvasFader : MonoBehaviour
+    {
+        public MenuType MenuType;
+        public bool Visible => GetComponent<CanvasGroup>().alpha > 0.9f;
+
+        IEnumerator ChangeVisibility(bool lerp, bool show, float TimeToLerp)
+        {
+            float timeLerped = 0;
+
+            var group = GetComponent<CanvasGroup>();
+
+            group.interactable = group.blocksRaycasts = show;
+
+            if (lerp)
+            {
+                while (timeLerped < TimeToLerp)
+                {
+                    var lerped = Mathf.Lerp(0, 1, timeLerped / TimeToLerp);
+
+                    if (lerped > 0.9)
+                        lerped = 1;
+                    else if (lerped < 0.1)
+                        lerped = 0;
+
+                    group.alpha = show ? lerped : 1 - lerped;
+
+                    timeLerped += Time.unscaledDeltaTime;
+
+                    yield return null;
+                }
+            }
+            else
+            {
+                group.alpha = show ? 1 : 0;
+            }
+
+            yield return null;
+        }
+
+        public void HidePanel(bool lerp, float TimeToLerp)
+        {
+            StartCoroutine(ChangeVisibility(lerp, false, TimeToLerp));
+        }
+
+        public void ShowPanel(bool lerp, float TimeToLerp)
+        {
+            StartCoroutine(ChangeVisibility(lerp, true, TimeToLerp));
+        }
+    }
+}

Assets/Scripts/UI/Canvas/CanvasFader.cs.meta

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Assets/Scripts/UI/Canvas/CanvasManager.cs

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+using System.Linq;
+using UnityEngine;
+
+namespace Exsersewo.UI.Canvas
+{
+    [RequireComponent(typeof(CanvasGroup))]
+    public class CanvasManager : MonoBehaviour
+    {
+        public CanvasFader[] Canvases;
+        public float TimeToLerp;
+
+        void ChangeCanvas(MenuType menu, bool lerp)
+        {
+            var toZero = Canvases.Where(x => x.MenuType != menu).ToList();
+            var toOne = Canvases.FirstOrDefault(x => x.MenuType == menu);
+
+            toZero.ForEach(x =>
+            {
+                var fader = x.GetComponent<CanvasFader>();
+                if (fader.Visible)
+                {
+                    fader.HidePanel(lerp, TimeToLerp);
+                }
+            });
+
+            toOne.GetComponent<CanvasFader>().ShowPanel(lerp, TimeToLerp);
+        }
+
+        public void ChangeToCanvas(CanvasFader menu)
+            => ChangeToCanvas(menu.MenuType);
+
+        public void ChangeToCanvas(MenuType menu)
+            => ChangeCanvas(menu, false);
+
+        public void LerpToCanvas(CanvasFader menu)
+            => LerpToCanvas(menu.MenuType);
+
+        public void LerpToCanvas(MenuType menu)
+            => ChangeCanvas(menu, true);
+    }
+
+    [System.Serializable]
+    public enum MenuType
+    {
+        Game = 0,
+        Stats = 1,
+        Codex = 2
+    }
+}

Assets/Scripts/UI/Canvas/CanvasManager.cs.meta

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