using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Diagnostics;

namespace WpfBrowserApplication1
{
    /// <summary>
    /// Page1.xaml 的交互逻辑
    /// </summary>
    public partial class Page1 : Page
    {
        public Page1()
        {
            InitializeComponent();
        }

        private void Page_Loaded(object sender, RoutedEventArgs e)
        {
            ResourcePermission resourcePer = new ResourcePermission() { Name="tb3",Avaliable=0};
            object obj = PrintLogicalTree(this, resourcePer);

            if (obj is TextBlock)
            {
                TextBlock btn = obj as TextBlock;
                MessageBox.Show(btn.Text);
            }
            else if (obj is TextBox)
            {
                TextBox tb = obj as TextBox;
                MessageBox.Show(tb.Text);
            }
            else if (obj is Button)
            {
                Button btn = obj as Button;
                btn.IsEnabled = false;
            }
        }

        object PrintLogicalTree(object obj, ResourcePermission resourcePermission)
        {
            if (obj == null)
                return null;

            if (obj is TextBlock)
            {
                TextBlock btn = obj as TextBlock;
                if (resourcePermission.Name.Equals(btn.Name))
                {
                    if (resourcePermission.Avaliable==0)
                        btn.Visibility = Visibility.Collapsed;
                    else
                        btn.Visibility = Visibility.Visible;

                    return btn;
                }
            }
            else if (obj is TextBox)
            {
                TextBox tb = obj as TextBox;
                if (resourcePermission.Equals(tb.Name))
                    return tb;
            }
            else if (obj is Button)
            {
                Button btn = obj as Button;
                if (resourcePermission.Equals(btn.Name))
                    return btn;
            }

            //如果不是DependencyObject，如string等类型
            //if (!(obj is DependencyObject))
            //    return null;

            object result = null;
            //递归打印逻辑树
            foreach (object child in LogicalTreeHelper.GetChildren(
                obj as DependencyObject))
            {
                if (child is DependencyObject)
                {
                    result = PrintLogicalTree(child, resourcePermission);
                }

                if (result != null)
                    break;
            }

            return result;
        }

        enum ResourceTypeEnum
        {
            Button = 1,
            TextBlock = 2,
            Textbox=3,
            Combox=4,
        }

        class ResourcePermission
        {
            public string Name { get; set; }

            public Int16 Avaliable { get; set; }
        }
       
        DependencyObject PrintVisualTree(DependencyObject obj,string value)
        {
            if (obj == null)
                return null;

            //打印空格，方便查看
            Debug.WriteLine(obj);
            if (obj is TextBlock)
            {
                TextBlock tb = obj as TextBlock;
                if(value.Equals(tb.Name))
                    return tb;
            }
           
            //  递归打印视觉树
            DependencyObject result = null;
           
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
            {
                result= PrintVisualTree(VisualTreeHelper.GetChild(obj, i),value);
                if (result != null)
                    break;
            }

            return result;
        }
    }

}

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