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Src/Unity/Scripts/UX/Core/UXToolTips.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.EventSystems;
+using UnityEngine.InputSystem;
+using UnityEngine.UIElements;
+
+namespace BITKit.UX
+{
+	public class UXToolTips : MonoBehaviour
+	{
+		private VisualElement root;
+		private Label label;
+
+		private void Start()
+		{
+			root = GetComponent<UIDocument>().rootVisualElement;
+			label = root.Q<Label>();
+		}
+
+		private void Update()
+		{
+			var tooltip = CurrentToolTip(root.panel);
+			if (tooltip != "")
+			{
+				var mouse = Mouse.current;
+				if (mouse is null) return;
+				var mousePos = mouse.position.ReadValue();
+				mousePos.y = Screen.height - mousePos.y;
+				var pos =RuntimePanelUtils.ScreenToPanel(label.panel,mousePos);
+				pos.x += 24;
+				if (pos.x + label.layout.width > label.panel.visualTree.layout.width)
+				{
+					//pos.x = label.panel.visualTree.layout.width - label.layout.width - label.layout.width;
+					pos.x-=label.layout.width+48;
+				}
+				
+				label.visible = true;
+				label.text = tooltip;
+				label.transform.position = pos;
+			}
+			else
+			{
+				label.visible = false;
+			}
+		}
+
+		private string CurrentToolTip(IPanel panel)
+		{
+			// https://docs.unity3d.com/2022.2/Documentation/Manual/UIE-faq-event-and-input-system.html
+
+			if (!EventSystem.current.IsPointerOverGameObject()) return "";
+
+			var screenPosition = Input.mousePosition;
+			screenPosition.y = Screen.height - screenPosition.y;
+
+			VisualElement ve = panel.Pick(RuntimePanelUtils.ScreenToPanel(panel, screenPosition));
+			return ve == null ? "" : ve.tooltip;
+		}
+	}
+}
+