using TMPro;
using UnityEngine;
using UnityEngine.UI;


[RequireComponent(typeof(Mask))]
[RequireComponent(typeof(Image))]
public class TextScroll : MonoBehaviour
{


    private TextMeshProUGUI txt;
    private Text txt1;

    private RectTransform rtf;

    private RectTransform rtfTxt;

    private bool isScroll;


    private float scrollLen;
    private float curPosx;
    private float scrollSpeed = 20;
    public void Awake()
    {

        rtf = GetComponent<RectTransform>();

        txt = rtf.GetChild(0).GetComponent<TextMeshProUGUI>();

        txt1 = rtf.GetChild(0).GetComponent<Text>();

    }
    public void CheckScroll()
    {
        var cttWidth = rtf.rect.width;
        float len = 0;

        if (txt != null)
        {
            len = txt.preferredWidth;
            rtfTxt = txt.rectTransform;
        }
        else if (txt1 != null)
        {
            len = txt1.preferredWidth;
            rtfTxt = txt1.rectTransform;
        }

        isScroll = len != 0 && (cttWidth < len);

        if (isScroll)
        {
            rtfTxt.pivot = new Vector2(0, 0.5f);
            rtfTxt.anchoredPosition = Vector2.zero;
            scrollLen = -(len - cttWidth);
            curPosx = 0;
        }

    }


    public void Update()
    {

        if (!isScroll) return;

        curPosx -= Time.deltaTime * scrollSpeed;


        rtfTxt.anchoredPosition = new Vector2(curPosx, 0);

        if (curPosx < scrollLen)
        {
            curPosx = 0;
        }

    }



}