//[ContextMenu("Remove Component")]
      //void DoSomething()
      //{
      //    foreach (GameObject o in Selection.gameObjects)
      //    {
      //        DestroyImmediate(o, true);
      //    }
      //}

using UnityEngine.UI;

public class Test : MonoBehaviour,  IPointerDownHandler, IPointerUpHandler {

     public bool go_left = false;
     public bool go_right = false;

     void Start()
     {

     }

     void Update()
     {

         if (go_left == true)
         {
             Debug.Log("left");
         }

         if (go_right == true)
         {
             Debug.Log("right");
         }

     }

     public void OnPointerDown(PointerEventData eventData)
     {
         go_left = true;
         go_right = true;
     }

     public void OnPointerUp(PointerEventData eventData)
     {
         go_left = false;
         go_right = false;
     }
}

else
          {
              go_left = false;
              go_right = false;
          }