Display image by using tooltip

Question

I want to display the image using a tooltip. So when I point to the 3dobject, it will display the image that I already created. Right now I already set the sprite in the tooltip but I have an error in the function HideToolTip. In this function, I want to hide the image when the arrow/cursor is away from the object.

------TooltipManager Script-----

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using TMPro;

public class TooltipManager : MonoBehaviour
{
    public static TooltipManager _instance;

    public Image imageComponent;

    //public SpriteRenderer imageComponent;
    // SpriteRenderer spriteRenderer = gameObject.GetComponent<SpriteRenderer>();

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

    // Start is called before the first frame update
    void Start()
    {
        Cursor.visible = true;
        gameObject.SetActive(false);
    }

    // Update is called once per frame
    void Update()
    {
        transform.position = Input.mousePosition;
    }

    public void SetAndShowToolTip(Sprite Image)
    {
        gameObject.SetActive(true);
        imageComponent.sprite = Image;
    }

    public void HideToolTip()
    {
        gameObject.SetActive(false);
        imageComponent.sprite = Sprite.Destroy();
    }

}

Right now, I have an error in HideToolTip function.

------Tooltip Script-----

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class Tooltip : MonoBehaviour
{
    public Sprite Image;

    private void OnMouseEnter()
    {
        TooltipManager._instance.SetAndShowToolTip(Image);
    }

    private void OnMouseExit()
    {
        TooltipManager._instance.HideToolTip();
    }
}

Answer 1

If you look up the documentation of the method Destroy, you will see that it requires the thing you want to destroy as an argument.

So instead of imageComponent.sprite = Sprite.Destroy();, you would write:

Destroy(imageComponent.sprite)

However, destroying the whole sprite asset just to hide the tooltip might be a bit radical. It would be better to use the Image.visible property:

imageComponent.visible = false;

Note how reading the documentation can literally save you days of waiting for people to answer your questions on the Internet. Being able to find and read documentation is one of the most important skills for a software developer.

Answer 2

You can use Unity event system and IPointerEnterHandler, IPointerExitHandler interfaces so something like this:

using UnityEngine;
using UnityEngine.EventSystems;

public class Tooltip : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler
{
    [SerializeField] private GameObject tooltipPanel;
    public void OnPointerEnter(PointerEventData eventData)
    {
        tooltipPanel.SetActive(true);
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        tooltipPanel.SetActive(false);
    }
}

Just make sure you have a physic raycaster on your camera and collider on objects. If you use it on UI make sure the UI objects has raycast target enable.