유니티 C# 인벤토리 드래그 앤 드롭 시스템 간단 구현 Inventory Drag and Drop

유니티 C# 인벤토리 드래그 앤 드롭 시스템 간단 구현 Inventory Drag and Drop

 

InventorySlot.cs 작성

using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class InventorySlot : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler, IPointerClickHandler, IPointerEnterHandler, IPointerExitHandler
{
    private Transform originalParent;
    private CanvasGroup canvasGroup;
    private RectTransform rectTransform;

    public Item item;
    private float lastClickTime;
    private const float doubleClickTime = 0.3f;

    private void Awake()
    {
        canvasGroup = GetComponent<CanvasGroup>();
        rectTransform = GetComponent<RectTransform>();
    }

    public void OnBeginDrag(PointerEventData eventData)
    {
        originalParent = transform.parent;
        transform.SetParent(transform.root);
        canvasGroup.blocksRaycasts = false;
        canvasGroup.alpha = 0.6f;
    }

    public void OnDrag(PointerEventData eventData)
    {
        rectTransform.anchoredPosition += eventData.delta;
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        transform.SetParent(originalParent);
        canvasGroup.blocksRaycasts = true;
        canvasGroup.alpha = 1f;

        // 드롭한 대상이 인벤토리 슬롯인지 확인
        if (eventData.pointerEnter != null && eventData.pointerEnter.GetComponent<InventorySlot>() != null)
        {
            InventorySlot targetSlot = eventData.pointerEnter.GetComponent<InventorySlot>();
            SwapItems(targetSlot);
        }

        rectTransform.anchoredPosition = Vector3.zero;
    }

    void SwapItems(InventorySlot targetSlot)
    {
        Item tempItem = targetSlot.item;
        targetSlot.item = this.item;
        this.item = tempItem;

        UpdateSlotUI();
        targetSlot.UpdateSlotUI();
    }

    public void UpdateSlotUI()
    {
        if (item != null)
        {
            GetComponentInChildren<Image>().sprite = item.itemIcon;
            GetComponentInChildren<Image>().enabled = true;
        }
        else
        {
            GetComponentInChildren<Image>().enabled = false;
        }
    }
}