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Src/Unity/Scripts/UX/Popup/UXPopup.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using BITKit;
+using BITKit.UX;
+using UnityEngine;
+using UnityEngine.UIElements;
+
+namespace BITKit.UX
+{
+	[Serializable]
+	public class UXPopupSelector:IUXPopup
+	{
+		[SerializeReference,SubclassSelector] private IReference popupPath;
+		public void Popup(string content, float duration = 3)
+		{
+			UXPopup.Dictionary[popupPath.Value].Popup(content,duration);
+		}
+	}
+	public sealed class UXPopup : MonoBehaviour,IUXPopup
+	{
+		internal static readonly Dictionary<string,UXPopup> Dictionary=new();
+		
+		[SerializeField] private UIDocument document;
+		[SerializeReference, SubclassSelector] private IReference containerPath;
+		[SerializeReference, SubclassSelector] private IReference popupPath;
+		[SerializeField] private VisualTreeAsset popupTemplate;
+
+		private VisualElement container;
+
+		private readonly List<ViewModel> instances = new();
+			
+			private class ViewModel
+			{
+				public VisualElement visualElement;
+				public float exitTime;
+				public bool disposed;
+			}
+			
+		private void Start()
+		{
+			container = document.rootVisualElement.Q<VisualElement>(containerPath.Value);
+			
+			Dictionary.Add(popupPath.Value,this);
+			
+			destroyCancellationToken.Register(() => Dictionary.Remove(popupPath.Value));
+			
+			container.Clear();
+		}
+
+		private void Update()
+		{
+			foreach (var x in instances.Where(x=>Time.time > x.exitTime))
+			{
+				x.visualElement.RemoveFromHierarchy();
+				x.visualElement.SetOpacity(
+					Mathf.MoveTowards(x.visualElement.GetOpacity(),0,Time.deltaTime)
+					);
+				x.disposed = x.visualElement.GetOpacity() is 0;
+			}
+			instances.RemoveAll(x =>x.disposed);
+
+			container.SetActive(container.childCount > 0);
+		}
+
+		public void Popup(string content, float duration = 3)
+		{
+			var visualElement =new UXContainer(container.Create<VisualElement>(popupTemplate.CloneTree))
+				{
+					contextLabel =
+					{
+						text = content
+					}
+				};
+			instances.Add(new ViewModel()
+			{
+				visualElement = visualElement,
+				exitTime = Time.time + duration
+			});
+		}
+	}
+}