Cancel a drag and drop movement

Hello!

I want to cancel a drag and drop movement programmatically. Is there a way to do this?

I am using right now the interfaces IBeginDragHandler, IDragHandler, IEndDragHandler.

What I am trying to do: I want to cancel the dragging when I leave a certain area. So when I leave the OnEndDrag Method should be called and the drag is ended.

PS: Right now I have an internal variable to see if am still dragging and stop it if I leave the area. Right now, OnEndDrag is called twice. not really ideal.

  using UnityEngine;

  using UnityEngine.UI;

  using System.Collections;

  using UnityEngine.EventSystems;

  public class DraggableCard : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler {

      public Text nameText;

      Vector3 startPosition;

      Transform startParent;

      bool dragging = false;

      public EventTrigger parentBox;

      void Start () {

          EventTrigger.Entry entry = new EventTrigger.Entry();

          entry.eventID = EventTriggerType.PointerExit;

          entry.callback = new EventTrigger.TriggerEvent();

          UnityEngine.Events.UnityAction<BaseEventData> callback =

              new UnityEngine.Events.UnityAction<BaseEventData>(PointerExit);

          entry.callback.AddListener(callback);

          parentBox.delegates.Add(entry);

      }

      public string Info {

          get { return nameText.text; }

          set { nameText.text = value; }

      }

      public void OnBeginDrag (PointerEventData eventData)

      {

          dragging = true;

          startPosition = transform.position;

          startParent = transform.parent;

      }

      public void OnDrag (PointerEventData eventData)

      {

          if (dragging) {

              Vector3 pos = transform.position;

              pos.x = eventData.position.x;

              transform.position = pos;

          }

      }

      public void OnEndDrag (PointerEventData eventData)

      {

          if (dragging) {

              StartCoroutine(SmoothMove (transform.position, startPosition,

0.2f)); dragging = false;

          }

      }

      public void PointerExit(BaseEventData data) {

          Debug.Log ("We Left!");

          OnEndDrag (null);

      }

  }

 

Thanks, Matthias