ScrollRect.OnBeginDrag

Description

Handling for when the content is beging being dragged.

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems; // Required when using event data

public class ExampleClass : MonoBehaviour, IBeginDragHandler // required interface when using the OnBeginDrag method.
{
    //Do this when the user starts dragging the element this script is attached to..
    public void OnBeginDrag(PointerEventData data)
    {
        Debug.Log("They started dragging " + this.name);
    }
}