Unity UI drag and drop model selection function

using ;
using ;
using UnityEngine;

public class UIModelUtil : MonoBehaviour
{
  public Animator animator;
  public int id;
  public int index;

}

using ;
using ;
using UnityEngine;

public class UIModelControl : MonoBehaviour
{
  public Transform modelsParent;
  public Transform centerPos;
  public float interval;
  public bool loop;

  List<UIModelUtil> models;
  bool isPressing;
  public UIDrag dragComp;


  Vector3 mousePos;

  private void Awake()
  {
    if(models == null)
    {
      int i = 0;
      models = new List<UIModelUtil>();
      foreach(UIModelUtil util in <UIModelUtil>())
      {
        (util);
        // = i;
        Vector3 pos = ;
         = i * interval;
         = pos;
        i++;
      }
    }
  }

  private void Start()
  {
    JumpToSelect();
  }

  
  private void Update()
  {
    //Accept drag events    if (isPressing)
    {
      float x = GetInputDeltaX();
      int dir = 0;
      if (x > 0) dir = 1;
      else if (x < 0) dir = -1;

      //Resolution correction      if (dir == 0) return;
      x = (x) / () * 800f;
      if (x > 800f) x = 800f;

      //Offset      float currectX = (0, interval, x / 800f) * dir;
      Vector3 pos = ;
       += currectX;



        Transform right = GetRight().transform;
        Transform left = GetLeft().transform;
      //Set borders when not looping      if ( > 2 || !loop ||  == 1)
      {
    

        if ( + interval / 10 < -)  = -( + interval / 10);
        else if ( - interval / 10 > -)  = -( - interval / 10);

        // = pos;
      }
      // When there are only two cycles      else if ( == 2 && loop)
      {

        Transform selected = GetSelect().transform;
        //The current one is on the right and drag to the right        if (selected == right && dir < 0)
        {
          
          Vector3 leftPos = ;
           =  + interval;
           = leftPos;
        }
        //The current one is on the left and drag to the left        else if (selected == left && dir > 0)
        {
          Vector3 rightPos = ;
           =  - interval;
           = rightPos;
        }
      }
       = pos;
      
      AfterSelect();
    }
  }


  void AfterSelect()
  {
    foreach(UIModelUtil util in models)
    {
      float dis = GetXDis(util);
      //Set display      if (dis > interval)
        (false);
      else
      { 
        //The closer you get to the middle, the more forward you get        (true);
        float t = (dis) / interval;
        float y = (, , t);
        Vector3 pos = ;
         = y;
         = pos;
      }

    }
    //Location correction during loop    if (loop &&  > 2)
    {
      Transform right = GetRight().transform;
      Transform left = GetLeft().transform;
      Transform selected = GetSelect().transform;
      if (selected == right)
      {
        Vector3 pos = ;
         += interval;
         = pos;
      }
      else if (selected == left)
      {
        Vector3 pos = ;
         -= interval;
         = pos;
      }
    }
    //Set the UI selection status    (GetSelect().id, GetSelect().index);
  }

  //Select by id   UIModelUtil GetById(int id)
  {
    if (models == null) return null;
    UIModelUtil target = null;

    foreach (UIModelUtil util in models)
    {
      if ( == id) return util;
    }
    return target;
  }

  //Get the currently selected   UIModelUtil GetSelect()
  {
    if (models == null) return null;
    float min = 9999;

    UIModelUtil target = null;

    foreach(UIModelUtil util in models)
    {
      float dis = ( GetXDis(util));
      if(dis < min)
      {
        target = util;
        min = dis;
      }
    }
    return target;
  }

  //The one on the rightmost of all models   UIModelUtil GetRight()
  {
    if (models == null) return null;
    float max = -9999;

    UIModelUtil target = null;

    foreach(UIModelUtil util in models)
    {
      float dis = ;
      if(dis > max)
      {
        target = util;
        max = dis;
      }
    }

    return target;
  }

  //The one on the leftmost of all models   UIModelUtil GetLeft()
  {
    if (models == null) return null;
    float min = 9999;

    UIModelUtil target = null;

    foreach(UIModelUtil util in models)
    {
      float dis = ;
      if(dis < min)
      {
        target = util;
        min = dis;
      }
    }


    return target;
  }

  // Press the UI control to trigger  public void OnPress()
  {
    if (isPressing) return;
    isPressing = true;

    if ()
      mousePos = ;
    else
      mousePos = (0).position;
    if (backing != null) StopCoroutine(backing);
  }

  //Universal control release trigger  public void OnRelease()
  {
    backing = StartCoroutine(ToSelect());
    isPressing = false;
  }


  Coroutine backing;
  //Offset after release  IEnumerator ToSelect()
  {


    UIModelUtil selected = GetSelect();
    float dis = GetXDis(selected);
    float time =  (0, 1f, (dis) / interval);
    float timer = 0;
    Vector3 from = ;
    Vector3 to = from;
     = -;

    while(timer < time)
    {
      timer += ;
      float t = timer / time;
      Vector3 pos = (from, to, t);
       = pos;
      AfterSelect();
      yield return null;
    }
    backing = null;

  }

  //Get finger offset  float GetInputDeltaX()
  {
    Vector3 pos;
    if ()
      pos = ;
    else
      pos = (0).position;
    Vector3 delta = pos - mousePos;
    //(pos +"/"+mousePos +"/"+ );
    mousePos = pos;
    return ;
      
  }

  // Calculate the X-axis distance of the offset center position  float GetXDis(UIModelUtil util)
  {
    return  - ;
  }

  // Jump to the selected id  public void JumpToSelect()
  {
    int id = ;
    Vector3 pos = ;
    UIModelUtil selected = GetById(id);
     = -;
     = pos;

    AfterSelect();
  }


}

using ;
using ;
using UnityEngine;
using ;
public class UIDrag : MonoBehaviour,IPointerDownHandler, IPointerUpHandler
{
  public UIModelControl control;

  virtual public void OnPointerDown(PointerEventData data)
  {
    ();
  }

  virtual public void OnPointerUp(PointerEventData data)
  {
    ();
  }

  virtual public void OnSelected(int id, int index)
  {

  }
}