Hệ thống Tooltip đơn giản cho UI

/* TooltipManager.cs (Singleton) */
using UnityEngine;
using TMPro;

public class TooltipManager : MonoBehaviour
{
    public static TooltipManager Instance { get; private set; }
    public Tooltip tooltip;

    void Awake()
    {
        if (Instance != null && Instance != this) Destroy(gameObject); else Instance = this;
    }

    void Start()
    {
        if (tooltip != null) tooltip.gameObject.SetActive(false);
    }

    public void ShowTooltip(string content)
    {
        if (tooltip != null)
        {
            tooltip.SetText(content);
            tooltip.gameObject.SetActive(true);
        }
    }

    public void HideTooltip()
    {
        if (tooltip != null) tooltip.gameObject.SetActive(false);
    }
}

/* Tooltip.cs */
using UnityEngine;
using TMPro;

public class Tooltip : MonoBehaviour
{
    public TextMeshProUGUI contentField;
    public RectTransform backgroundRectTransform;
    private RectTransform rectTransform;

    void Awake()
    {
        rectTransform = GetComponent<RectTransform>();
    }

    void Update()
    {
        // Follow mouse position
        transform.position = Input.mousePosition;

        // Adjust pivot to stay on screen
        Vector2 pivot = new Vector2(Input.mousePosition.x / Screen.width, Input.mousePosition.y / Screen.height > 0.5f ? 1 : 0);
        rectTransform.pivot = pivot;
    }

    public void SetText(string content)
    {
        contentField.text = content;
        // Optional: Adjust background size based on text length
        backgroundRectTransform.sizeDelta = new Vector2(contentField.preferredWidth + 20f, contentField.preferredHeight + 20f);
    }
}

/* TooltipTrigger.cs */
using UnityEngine;
using UnityEngine.EventSystems;

public class TooltipTrigger : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler
{
    [TextArea]
    public string content;

    public void OnPointerEnter(PointerEventData eventData)
    {
        TooltipManager.Instance.ShowTooltip(content);
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        TooltipManager.Instance.HideTooltip();
    }
}