ButtonGridDrag.cs

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using System;
using UnityEngine.EventSystems;
 
public class ButtonGridDrag : ButtonGrid, IDragHandler, IEventSystemHandler
{
    public IDragParent dragParent;
 
    [NonSerialized]
    public bool dragged;
 
    public override void SetDragParent(IDragParent p)
    {
        dragParent = p;
    }
 
    public void OnDrag(PointerEventData data)
    {
        if (dragParent != null && (!CanDragLeftButton || data.button == PointerEventData.InputButton.Left) && (CanDragLeftButton || data.button == PointerEventData.InputButton.Right))
        {
            if (!dragged)
            {
                SE.DragStart();
                dragged = true;
                dragParent.OnStartDrag(this);
                OnPointerUpOnDrag(data);
            }
            else
            {
                dragParent.OnDrag(this);
            }
        }
    }
 
    public override void OnPointerUp(PointerEventData eventData)
    {
        if (dragged)
        {
            dragged = false;
            dragParent.OnEndDrag(this);
            UIInventory.RefreshAllList();
        }
        else
        {
            base.OnPointerUp(eventData);
        }
    }
}