TianJin_23/Assets/Scripts/UIControl/MiddleButtonDrag.cs

using System.Runtime.InteropServices;
using UnityEngine;

public class MiddleButtonDrag : MonoBehaviour 
{

    public GameObject Target;

    private Vector3 prevPos = Vector3.zero;

    private Vector3 FirstOutPosition = Vector3.zero;


    void LateUpdate()
    {
        if (Input.GetMouseButtonDown(2))
        {
            var screenSpace = Camera.main.WorldToScreenPoint(Target.transform.position);
            prevPos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z);
            FirstOutPosition = prevPos;
           
        }

        if (Input.GetMouseButtonUp(2))
        {
            //prevPos = Vector3.zero;
            //Cursor.visible = true;
        }
        
        if (Input.GetMouseButton(2))
        {
            var screenSpace = Camera.main.WorldToScreenPoint(Target.transform.position);

            var currPos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z);

            var prev = Camera.main.ScreenToWorldPoint(prevPos);
            var curr = Camera.main.ScreenToWorldPoint(currPos);

            var offset = curr - prev;

            offset.y = 0;
            Target.transform.position += -offset;

            prevPos = currPos;

            //Cursor.visible = false;



            //if (currPos.x < 0 || currPos.x > Screen.width)
            //{
            //    Cursor.lockState = CursorLockMode.Locked;
            //    Cursor.lockState = CursorLockMode.None;
               
            //    var screenSpace_ = Camera.main.WorldToScreenPoint(Target.transform.position);
            //    prevPos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace_.z);
            //}
            //else if (currPos.y < 0 || currPos.y > Screen.height)
            //{
            //    Cursor.lockState = CursorLockMode.Locked;
            //    Cursor.lockState = CursorLockMode.None;
              
            //    var screenSpace_ = Camera.main.WorldToScreenPoint(Target.transform.position);
            //    prevPos = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace_.z);
            //}

        }



    }
}