using UnityEngine;
using System.Collections;
using UnityEngine.UI;


/// <summary>
/// 超链接按钮 参考资料 [1] 陌的专栏 http://blog.csdn.net/juan_bo/article/details/52301302
/// </summary>
public class UILinkButton : MonoBehaviour
{

    private Text linkText;

    public string m_url;

    void Awake()
    {
        var tfText = transform.Find("Text");
        if (tfText)
            linkText = transform.Find("Text").GetComponent<Text>();

    }
    void Start()
    {
        CreateLink(linkText, onButtonClick);
    }

    public void CreateLink(Text text, UnityEngine.Events.UnityAction onClickBtn)
    {
        if (text == null)
            return;

        //克隆Text，获得相同的属性
        Text underline = Instantiate(text) as Text;
        underline.name = "Underline";

        underline.transform.SetParent(text.transform);
        RectTransform rt = underline.rectTransform;

        underline.transform.localScale = Vector3.one;

        //设置下划线坐标和位置
        rt.anchoredPosition3D = Vector3.zero;
        rt.offsetMax = Vector2.zero;
        rt.offsetMin = Vector2.zero;
        rt.anchorMax = Vector2.one;
        rt.anchorMin = Vector2.zero;


        underline.text = "_";
        float perlineWidth = underline.preferredWidth;      //单个下划线宽度
        float width = text.preferredWidth;
        int lineCount = (int)Mathf.Round(width / perlineWidth);

        for (int i = 1; i < lineCount; i++)
            underline.text += "_";

        var btn = text.gameObject.AddComponent<UIButton>();
        btn.onClick.AddListener(onClickBtn);
    }

    //点击响应
    void onButtonClick()
    {
        if (string.IsNullOrEmpty(m_url))
            return;

        Application.OpenURL(m_url);

    }
}