using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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;
using System.Globalization;
using System.Windows;
using System.Windows.Data;
using System.Windows.Media.Imaging;
using System.IO;

namespace Wpf_lab2_zawadkaf
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>



        public partial class MainWindow : Window
        {
            public MainWindow()
            {
                InitializeComponent();
                DriveInfo[] drives = DriveInfo.GetDrives();
                foreach (DriveInfo driveInfo in drives)
                    trvStructure.Items.Add(CreateTreeItem(driveInfo));
            }

            public void TreeViewItem_Expanded(object sender, RoutedEventArgs e)
            {
                TreeViewItem item = e.Source as TreeViewItem;
                if ((item.Items.Count == 1) && (item.Items[0] is string))
                {
                    item.Items.Clear();

                    DirectoryInfo expandedDir = null;
                    if (item.Tag is DriveInfo)
                        expandedDir = (item.Tag as DriveInfo).RootDirectory;
                    if (item.Tag is DirectoryInfo)
                        expandedDir = (item.Tag as DirectoryInfo);
                    try
                    {
                        foreach (DirectoryInfo subDir in expandedDir.GetDirectories())
                            item.Items.Add(CreateTreeItem(subDir));
                    }
                    catch { }
                }
            }

            private TreeViewItem CreateTreeItem(object o)
            {
                TreeViewItem item = new TreeViewItem();
                item.Header = o.ToString();
                item.Tag = o;
                item.Items.Add("Loading...");
                return item;
            }
        }
    }