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

public class BaseView : MonoBehaviour
{
    public Canvas Canvas
    {
        get
        {
            return GameObject.FindObjectOfType<Canvas>();
        }
    }

    protected virtual void Awake()
    {
        OnInit(this.gameObject);
    }

    protected virtual void OnInit(GameObject obj)
    {
        SetActive<Transform>(this.gameObject.transform);
    }


    protected void SetActive<T>(T obj, bool state = true) where T: Component
    {
        if(obj == null)
        {
            Debug.LogError("传入对象为空");
            return;
        }
        obj.gameObject.SetActive(state);
    }
    protected void SetActive(GameObject obj, bool state = true)
    {
        if (obj == null)
        {
            Debug.LogError("传入对象为空");
            return;
        }
        obj.SetActive(state);
    }
    protected void AddListener(Button btn, Action action)
    {
        if (btn != null)
        {
            btn.onClick.AddListener(() =>
            {
                if (action != null)
                {
                    action();
                }
            });
        }
        else
        {
            Debug.LogError(btn.name + "对象的身上的Button组件为null");
        }
    }
    protected void SetText(Text txt, string context = "")
    {
        if (txt != null)
            txt.text = context;
    }

    /// <summary>
    /// 递归查找子对象
    /// </summary>
    /// <param name="trans"></param>
    /// <param name="childName"></param>
    /// <returns></returns>
    public GameObject GetChild(Transform trans, string childName)
    {
        Transform child = trans.Find(childName);
        if (child != null)
        {
            return child.gameObject;
        }
        int count = trans.childCount;
        GameObject go = null;
        int idx = 0;
        while (idx < count)
        {
            child = trans.GetChild(idx);
            go = GetChild(child, childName);
            if (go != null)
            {
                return go;
            }
            idx++;
        }
        return null;
    }
    public T GetChild<T>(Transform trans, string childName) where T : Component
    {
        if (trans == null)
        {
            Debug.LogError("传入父物体为空。无法查找");
            return default(T);
        }
        GameObject go = GetChild(trans, childName);
        if (go == null)
        {
            Debug.LogWarning("查找到的对象为 空。无法获取");
            return null;
        }
        return go.GetComponent<T>();
    }

}