2d camera panning

Hey, I'm trying to panning my camera like mobile panning, here is my current code.

 Vector3 move;
     private void CameraMovement1()
     {
         if (Input.GetMouseButtonDown(0))
         {
              dragOrigin = Input.mousePosition;
              return;
         }
         if (!Input.GetMouseButton(0))
             return;
 
             Vector3 pos = Camera.main.ScreenToViewportPoint(Input.mousePosition - dragOrigin);
             move = new Vector3(0, pos.y * dragspeed, 0);
 
             
             transform.Translate(-move * Time.deltaTime, Space.World);
                 
     }

In a mobile phone when you scrool Its keep going until you touch somewhere or scrolling speed decreases. But in my code if you want to scroll you have to keep scrolling. So, my question is how can i make mobile phone scrolling? Any idea, suggestion or something will be helpful.