using UnityEngine;

using UnityEngine.Events;

using UnityEngine.EventSystem;

[System.Serializable]

public class DragEvent : UnityEvent<Vector2>{}

​

public abstract class DragBaseUI: MonoBehaviour, IDragHangler, IBeginDragHandler, IEndDragHandler, IPointerExitHandler, IpointerEnterHandler

{

    public DragEvent dragEvent;

    protected bool entered;

    void IPointerEnterHandler.OnPointerEnter(PointerEventData eventData)

    {

        entered = true;

    }

    void IPointerExitHandler.OnPointerExit(PointerEventData eventData)

    {

        entered = false;

    }

    public abstract void OnDrag(PointerEventData eventData);

    public abstract void OnBeginDrag(PointerEventData eventData);

    public abstract void OnEndDrag(PointerEventData eventData);

}