UIItemSlot.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria.UI;
 
namespace Terraria.GameContent.UI.Elements;
 
public class UIItemSlot : UIElement
{
    private Item[] _itemArray;
 
    private int _itemIndex;
 
    private int _itemSlotContext;
 
    public UIItemSlot(Item[] itemArray, int itemIndex, int itemSlotContext)
    {
        _itemArray = itemArray;
        _itemIndex = itemIndex;
        _itemSlotContext = itemSlotContext;
        Width = new StyleDimension(48f, 0f);
        Height = new StyleDimension(48f, 0f);
    }
 
    private void HandleItemSlotLogic()
    {
        if (base.IsMouseHovering)
        {
            Main.LocalPlayer.mouseInterface = true;
            Item inv = _itemArray[_itemIndex];
            ItemSlot.OverrideHover(ref inv, _itemSlotContext);
            ItemSlot.LeftClick(ref inv, _itemSlotContext);
            ItemSlot.RightClick(ref inv, _itemSlotContext);
            ItemSlot.MouseHover(ref inv, _itemSlotContext);
            _itemArray[_itemIndex] = inv;
        }
    }
 
    protected override void DrawSelf(SpriteBatch spriteBatch)
    {
        HandleItemSlotLogic();
        Item inv = _itemArray[_itemIndex];
        Vector2 position = GetDimensions().Center() + new Vector2(52f, 52f) * -0.5f * Main.inventoryScale;
        ItemSlot.Draw(spriteBatch, ref inv, _itemSlotContext, position);
    }
}