StellarXipher/Assets/Scripts/InventoryUI.cs

using UnityEngine;
using UnityEngine.UI;

public class InventoryUI : MonoBehaviour
{
    [SerializeField] private Image[] slotImages; // 10 UI Images
    [SerializeField] private Inventory inventory; // The fixed-slot Inventory

    // These let you pick highlight/normal colors in the Inspector
    [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); // or Color.clear
            }
        }

        HighlightSlot(inventory.currentSlot); // after we set sprites, highlight the active slot
    }

    private void HighlightSlot(int slotIndex)
    {
        // Make sure it's a valid index
        if (slotIndex < 0 || slotIndex >= slotImages.Length)
            return;

        // Set all slots to normal color
        for (int i = 0; i < slotImages.Length; i++)
        {
            // If the slot is empty, you might want to leave it "clear"
            // but let's just do normalColor for demonstration:
            if (slotImages[i].sprite == null)
                slotImages[i].color = new Color(1,1,1,0); // keep empty slot invisible
            else
                slotImages[i].color = normalColor;
        }

        // Now highlight the active slot
        slotImages[slotIndex].color = highlightColor;
    }
}