StellarXipher/Assets/Scripts/InventoryUI.cs

using UnityEngine;
using UnityEngine.UI;

public class InventoryUI : MonoBehaviour
{
    [SerializeField] private Image[] slotImages;
    [SerializeField] private Inventory inventory;
    [SerializeField] private Color normalColor = Color.white;
    [SerializeField] private Color highlightColor = Color.yellow;

    void Start()
    {
        RefreshUI();
    }

    public void RefreshUI()
    {
        for (int i = 0; i < slotImages.Length; i++)
        {
            Item itemInSlot = inventory.slots[i];
            if (itemInSlot != null && itemInSlot.itemIcon != null)
            {
                slotImages[i].sprite = itemInSlot.itemIcon;
                slotImages[i].color = normalColor;
            }
            else
            {
                slotImages[i].sprite = null;
                slotImages[i].color = new Color(1, 1, 1, 0);
            }
        }

        HighlightSlot(inventory.currentSlot);
    }

    private void HighlightSlot(int slotIndex)
    {
        if (slotIndex < 0 || slotIndex >= slotImages.Length)
            return;

        for (int i = 0; i < slotImages.Length; i++)
        {
            if (slotImages[i].sprite == null)
                slotImages[i].color = new Color(1, 1, 1, 0);
            else
                slotImages[i].color = normalColor;
        }

        slotImages[slotIndex].color = highlightColor;
    }
}