how to do on single click fire and on drag appears the joystick and get the input from joystick

i have a joystick in my scene

1. on drag i want to do that take the input from joystick

2. on single tap fire i try on dragg(event data) and on pointer down but when i single click,the on drag function is called. here is my code public virtual void OnDrag(PointerEventData eventData) {

         if (HideOnRelease)
            {
                Hide(false);
            }
            // Unity remote multitouch related thing
            // When we feed fake PointerEventData we can't really provide a camera, 
            // it has a lot of private setters via not created objects, so even the Reflection magic won't help a lot here
            // Instead, we just provide an actual event camera as a public property so we can easily set it in the Input Helper class
            CurrentEventCamera = eventData.pressEventCamera ?? CurrentEventCamera;
   
            // We get the local position of the joystick
            Vector3 worldJoystickPosition;
            RectTransformUtility.ScreenPointToWorldPointInRectangle(_stickTransform, eventData.position,
                CurrentEventCamera, out worldJoystickPosition);
   
            // Then we change it's actual position so it snaps to the user's finger
            _stickTransform.position = worldJoystickPosition;
            // We then query it's anchored position. It's calculated internally and quite tricky to do from scratch here in C#
            var stickAnchoredPosition = _stickTransform.anchoredPosition;
   
            // Some bitwise logic for constraining the joystick along one of the axis
            // If the "Both" option was selected, non of these two checks will yield "true"
            if ((JoystickMoveAxis & ControlMovementDirection.Horizontal) == 0)
            {
   
                stickAnchoredPosition.x = _intermediateStickPosition.x;
            }
            if ((JoystickMoveAxis & ControlMovementDirection.Vertical) == 0)
            {
                stickAnchoredPosition.y = _intermediateStickPosition.y;
            }
   
            _stickTransform.anchoredPosition = stickAnchoredPosition;
   
            // Find current difference between the previous central point of the joystick and it's current position
            Vector2 difference = new Vector2(stickAnchoredPosition.x, stickAnchoredPosition.y) - _intermediateStickPosition;
   
            // Normalisation stuff
            var diffMagnitude = difference.magnitude;
            var normalizedDifference = difference / diffMagnitude;
   
            // If the joystick is being dragged outside of it's range
            if (diffMagnitude > MovementRange)
            {
   
                if (MoveBase && SnapsToFinger)
                {
                    // We move the base so it maps the new joystick center position
                    var baseMovementDifference = difference.magnitude - MovementRange;
                    var addition = normalizedDifference * baseMovementDifference;
                    _baseTransform.anchoredPosition += addition;
                    _intermediateStickPosition += addition;
                }
                else
                {
                    _stickTransform.anchoredPosition = _intermediateStickPosition + normalizedDifference * MovementRange;
                }
            }
   
            // We don't need any values that are greater than 1 or less than -1
            var horizontalValue = Mathf.Clamp(difference.x * _oneOverMovementRange, -1f, 1f);
            var verticalValue = Mathf.Clamp(difference.y * _oneOverMovementRange, -1f, 1f);
            // Finally, we update our virtual axis
            HorizintalAxis.Value = horizontalValue;
            VerticalAxis.Value = verticalValue;
   
        }
   
        public void OnPointerUp(PointerEventData eventData)
        {
            // When we lift our finger, we reset everything to the initial state
            _baseTransform.anchoredPosition = _initialBasePosition;
            _stickTransform.anchoredPosition = _initialStickPosition;
            _intermediateStickPosition = _initialStickPosition;
   
            HorizintalAxis.Value = VerticalAxis.Value = 0f;
   
            print ("pointer is up");
   
            // We also hide it if we specified that behaviour
            if (HideOnRelease)
            {
                Hide(true);
            }
        }
   
        public void OnPointerClick(PointerEventData eventData){
   
            print("on pointer click");
   
        }
        public void OnPointerDown(PointerEventData eventData)
        {
    
   

// fire here
//
// } // We also want to show it if we specified that behaviour // if (HideOnRelease) // { // Hide(false); // } }

     /// <summary>
     /// Simple "Hide" behaviour
     /// </summary>
     /// <param name="isHidden">Whether the joystick should be hidden</param>
     private void Hide(bool isHidden)
     {
         JoystickBase.gameObject.SetActive(!isHidden);
         Stick.gameObject.SetActive(!isHidden);
     }
 }

}