using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Media;
using System.Windows;

namespace YY.Admin.Core.Extension
{
    /// <summary>
    /// 窗体的扩展类
    /// </summary>
    public static class WindowExtensions
    {
        /// <summary>
        /// 查找子控件
        /// </summary>
        /// <typeparam name="T">子控件的类型</typeparam>
        /// <param name="obj">要找的是obj的子控件</param>
        /// <param name="name">想找的子控件的Name属性</param>
        /// <returns>目标子控件</returns>
        public static T GetChildObject<T>(this DependencyObject obj, string name) where T : FrameworkElement
        {
            DependencyObject child = null;
            T grandChild = null;

            for (int i = 0; i <= VisualTreeHelper.GetChildrenCount(obj) - 1; i++)
            {
                child = VisualTreeHelper.GetChild(obj, i);

                if (child is T && (((T)child).Name == name | string.IsNullOrEmpty(name)))
                {
                    return (T)child;
                }
                else
                {
                    grandChild = GetChildObject<T>(child, name);
                    if (grandChild != null)
                        return grandChild;
                }
            }
            return null;
        }
    }
}