Unity 2D Dragger Script

Dragger.cs

using System;
using DG.Tweening;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;

public class Dragger : MonoBehaviour, IDragHandler
{
    public GameObject target;
    public bool dragable = true;

    public float smoothTime = 0.1F;
    private Vector2 velocity = Vector2.zero;

    public UnityEvent afterCollide;

    public void OnDrag(PointerEventData eventData)
    {
        if (dragable)
        {
            var mousePosition = Input.mousePosition;
            transform.position = Vector2.SmoothDamp(transform.position,
                new Vector2(mousePosition.x, mousePosition.y), ref velocity, smoothTime);
        }
    }

    void OnTriggerEnter2D(Collider2D col)
    {
        if (col.transform.name == target.name)
        {
            afterCollide.Invoke();
        }
    }
}