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

namespace PDF_Office.Tools
{
    public static class CommonHelper
    {
        /// <summary>
        /// 查找对象目标类型的父类控件
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static T FindVisualParent<T>(DependencyObject obj) where T : class
        {
            try
            {
                while (obj != null)
                {
                    if (obj is T)
                        return obj as T;

                    obj = VisualTreeHelper.GetParent(obj);
                }
                return null;
            }
            catch { return null; }
        }

        /// <summary>
        /// 根据对象查找目标类型的子类
        /// </summary>
        /// <typeparam name="childItem"></typeparam>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static childItem FindVisualChild<childItem>(DependencyObject obj)
             where childItem : DependencyObject
        {
            try
            {
                for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
                {
                    DependencyObject child = VisualTreeHelper.GetChild(obj, i);
                    if (child != null && child is childItem)
                        return (childItem)child;
                    else
                    {
                        childItem childOfChild = FindVisualChild<childItem>(child);
                        if (childOfChild != null)
                            return childOfChild;
                    }
                }
                return null;
            }
            catch { return null; }
        }
    }
}