using System.Windows;
using System.Windows.Media;

namespace Muchinfo.PC.Common.Helpers
{
    public class WPFVisualTreeHelper
    {
        /// <summary>
        /// 从父容器中查找指定类型的控件
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="parent"></param>
        /// <returns></returns>
        public static T FindVisualChild<T>(DependencyObject parent) where T : DependencyObject
        {
            if (parent == null) return null;
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
            {
                var childObject = VisualTreeHelper.GetChild(parent, i);
                if (childObject == null) return null;
                var child = childObject as T;
                if (child == null)
                {
                    var childItem = FindVisualChild<T>(childObject);
                    if (childItem != null) return childItem;
                }
                return child;
            }
            return null;
        }

        /// <summary>
        /// 查找指定类型的父容器
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="child">The child.</param>
        /// <returns>``0.</returns>
        public static T FindVisualParent<T>(DependencyObject child) where T : DependencyObject
        {
            if (child == null) return null;
            var parentObject = VisualTreeHelper.GetParent(child);
            if (parentObject == null) return null;
            var parent = parentObject as T;
            return parent ?? FindVisualParent<T>(parentObject);
        }

        ///// <summary>
        ///// Finds the child.
        ///// </summary>
        ///// <typeparam name="T"></typeparam>
        ///// <param name="node">The node.</param>
        ///// <returns>``0.</returns>
        //public static T FindChild<T>(DependencyObject node)
        //    where T : DependencyObject
        //{
        //    if (node == null) return null;

        //    T found = null;
        //    var childlen = VisualTreeHelper.GetChildrenCount(node);
        //    for (int i = 0; i < childlen; i++)
        //    {
        //        var child = VisualTreeHelper.GetChild(node, i);
        //        var target = child as T;
        //        if (target == null)
        //        {
        //            found = FindChild<T>(child);
        //            if (found != null)
        //                break;
        //        }
        //        else
        //        {
        //            found = (T)child;
        //            break;
        //        }
        //    }

        //    return found;
        //}
    }
}