using System;
using TMPro;
using UnityEngine;

[ExecuteInEditMode]
public class FixRectWidthByString : MonoBehaviour
{
    public int minWidth = 40;
    private TextMeshProUGUI textComp;
    private void Awake()
    {
        textComp = GetComponentInChildren<TextMeshProUGUI>();
    }

    private void OnEnable()
    {
        SetRectSize();
    }
    private float GetTextWidth()
    {
        int width = 0;
        if (textComp != null)
        {
            var txt = textComp.text;
            var font = textComp.font.sourceFontFile;
            CharacterInfo characterInfo;
            font.RequestCharactersInTexture(txt, font.fontSize);
            for (int i = 0; i < txt.Length; i++)
            {
                font.GetCharacterInfo(txt[i], out characterInfo, font.fontSize);
                width += characterInfo.advance;
            }
        }
        return  width + minWidth;
    }

    [ContextMenu("激活")]
    private void SetRectSize()
    {
        GetComponent<RectTransform>().SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal,GetTextWidth());
    }
    
}