Need Help with Hovering Mouse Code

Question

I am new to Unity and C#. I have a script here for a card game where my card is supposed to move up and down when the pointer is hovered over the card. But when my point hovers over each card, they all move up together and not separately. They also move when they touch other UI elements, regardless of what they are. I am doing something wrong but I don't know what.

Here is my code:

//My Codes I needs help on.
   using UnityEngine;
   using System.Collections;
   using UnityEngine.EventSystems;

   public class Mouse_Detector_Temp : MonoBehaviour {
    public bool hovered;
    // Use this for initialization
    void Start ()
    {
        hovered = false;
    }

    // Update is called once per frame
    void Update ()
    {
        //This checks to see if you are hovered over.
        if (EventSystem.current.IsPointerOverGameObject ()) 
        {
            Debug.Log(gameObject);
            if (hovered == false)
            {
                transform.Translate(0,10,0);
                hovered = true;
            }
        }
        else
        {
            if (hovered == true)
            {
                transform.Translate(0,-10,0);
                hovered = false;
            }
        }
    }

}

Additional Information: This code is run UI elements that are part of a Canvas (only way to do it, so that should be obvious).

Answer 1

I am not quite sure what this does:

if (EventSystem.current.IsPointerOverGameObject ()) 

But for me it seems as if this method just checks, if the pointer hovers over any gameobject. And as you are checking this, for each card, in each frame, I think it is obvious, why you get that effect. Again: this only holds if the method does what I think.

You can overcome this problem by somehow checking, if the hovered object is also the actual object. And as you already have an event system, it would be nicer to register all the cards to an hover event and just do the moving in the update method.

Answer 2

I figured out how to fix this myself. This took me days just to find an answer to this question. I hope other people who find this question can use this answer.

//My Codes I needs help on.
using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using UnityEngine.EventSystems;

public class Mouse_Detector_Temp : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler {
    private bool hovered;

    // Use this for initialization
    void Start ()
    {
        hovered = false;

    }

    // Update is called once per frame
    void Update ()
    {

    }

    public void OnPointerEnter(PointerEventData eventData)
    {
        Debug.Log(gameObject);
        if (hovered == false)
        {
            transform.Translate(0,10,0);
            hovered = true;
        }
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        transform.Translate(0,-10,0);
        hovered = false;
    }
}

First I found out. For graphics, you need to use OnPointerEnter and OnPointerExit instead of EventSystem.current.IsPointerOverGameObject ()

And IT WASN'T WORKING, because... I was not aware I needed to add this:

public class Mouse_Detector_Temp : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler

To use OnPointerEnter and OnPointerExit.

I figured it out.