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Src/Unity/Scripts/UX/SnackBar/UXSnackBar.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using BITKit;
+using BITKit.Tween;
+using BITKit.UX;
+using Cysharp.Threading.Tasks;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace Net.BITKit.UX.SnackBar
+{
+    public class UXSnackBar<TPanel> : UIToolkitSubPanel<TPanel>,ISnackBar where TPanel :IUXPanel
+    {
+        [UXBindPath("snack_bar-container")] private VisualElement _snackBarContainer;
+
+        private VisualTreeAsset _template;
+        
+        private readonly ValidHandle _waitHandle = new ValidHandle();
+
+        public UXSnackBar(IServiceProvider serviceProvider) : base(serviceProvider)
+        {
+        }
+
+        protected override void OnInitiated()
+        {
+            base.OnInitiated();
+            _template = _snackBarContainer.Q<TemplateContainer>().templateSource;
+            
+            _snackBarContainer.Clear();
+            
+            BITAppForUnity.AllowCursor.AddListener(OnAllowCursor);
+        }
+
+        private void OnAllowCursor(bool obj)
+        {
+            if (obj)
+            {
+                _waitHandle.AddElement(this);
+            }
+            else
+            {
+                _waitHandle.RemoveElement(this);
+            }
+        }
+
+        public async void Add(string message, Severity severity = Severity.Normal)
+        {
+            var ve = _snackBarContainer.Create(_template);
+            
+            ve.AddToClassList($"severity-{severity.ToString().ToLower()}");
+
+            ve.Get<Label>().text = message;
+
+            if (ve.Q("VisualElement--1") is { } bar)
+            {
+                await BITween.Lerp(x => bar.style.width = new StyleLength(Length.Percent(x)), 0f, 100, 5, Mathf.Lerp);
+            }
+            else
+            {
+                await UniTask.Delay(5000);
+            }
+
+            await _waitHandle;
+            
+            ve.RemoveFromHierarchy();
+        }
+    }
+
+}