UnityEngine.EventSystems.PointerInputModule.ShouldStartDrag C# (CSharp) Method

        private static bool ShouldStartDrag(Vector2 pressPos, Vector2 currentPos, float threshold, bool useDragThreshold)
        {
            if (!useDragThreshold)
            {
                return true;
            }
            Vector2 vector = pressPos - currentPos;
            return (vector.sqrMagnitude >= (threshold * threshold));
        }

 protected virtual void ProcessDrag(PointerEventData pointerEvent)
 {        /*	used in StandaloneInputModule.ProcessToucheEvents() and StandaloneInputModule.ProcessMouseEvent(int id)
           *     call OnBeginDrag
           *     call OnPointerUp, if for some reason pointerPress != pointerDrag
           *     call OnDrag
           */
     if (pointerEvent.IsPointerMoving() && Cursor.lockState != CursorLockMode.Locked && !(pointerEvent.pointerDrag == null))
     {
         if (!pointerEvent.dragging && PointerInputModule.ShouldStartDrag(pointerEvent.pressPosition, pointerEvent.position, (float)base.eventSystem.pixelDragThreshold, pointerEvent.useDragThreshold))
         {
             ExecuteEvents.Execute <IBeginDragHandler>(pointerEvent.pointerDrag, pointerEvent, ExecuteEvents.beginDragHandler);
             pointerEvent.dragging = true;
         }
         if (pointerEvent.dragging)
         {
             if (pointerEvent.pointerPress != pointerEvent.pointerDrag)
             {
                 ExecuteEvents.Execute <IPointerUpHandler>(pointerEvent.pointerPress, pointerEvent, ExecuteEvents.pointerUpHandler);
                 pointerEvent.eligibleForClick = false;
                 pointerEvent.pointerPress     = null;
                 pointerEvent.rawPointerPress  = null;
             }
             ExecuteEvents.Execute <IDragHandler>(pointerEvent.pointerDrag, pointerEvent, ExecuteEvents.dragHandler);
         }
     }
 }