Mini Kabibi Habibi

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.IO;

using System.Windows.Forms;


namespace DevExpress.XtraTreeList.Demos {
    public partial class ExplorerNew : TutorialControl {
        public ExplorerNew() {
            InitializeComponent();
            TutorialInfo.WhatsThisCodeFile = "CS\\TreeListMainDemo\\Modules\\ExplorerNew.cs";
            TutorialInfo.WhatsThisXMLFile = "DevExpress.XtraTreeList.Demos.CodeInfo.ExplorerNew.xml";
            InitData();
        }

        //<treeList1>
        void InitData() {
            treeList1.DataSource = new object();
        }

        bool loadDrives = false;

        private void treeList1_VirtualTreeGetChildNodes(object sender, DevExpress.XtraTreeList.VirtualTreeGetChildNodesInfo e) {
            Cursor current = Cursor.Current;
            Cursor.Current = Cursors.WaitCursor;
            if (!loadDrives) {
                string[] roots = Directory.GetLogicalDrives();
                e.Children = roots;
                loadDrives = true;
            }
            else {
                try {
                    string path = (string)e.Node;
                    if (Directory.Exists(path)) {
                        string[] dirs = Directory.GetDirectories(path);
                        string[] files = Directory.GetFiles(path);
                        string[] arr = new string[dirs.Length + files.Length];
                        dirs.CopyTo(arr, 0);
                        files.CopyTo(arr, dirs.Length);
                        e.Children = arr;
                    }
                    else e.Children = new object[] { };
                }
                catch { e.Children = new object[] { }; }
            }
            Cursor.Current = current;
        }

        private void treeList1_VirtualTreeGetCellValue(object sender, DevExpress.XtraTreeList.VirtualTreeGetCellValueInfo e) {
            DirectoryInfo di = new DirectoryInfo((string)e.Node);
            if (e.Column == colName) e.CellData = di.Name;
            if (e.Column == colType) {
                if (IsDrive((string)e.Node)) e.CellData = "Drive";
                else if (!IsFile(di))
                    e.CellData = "Folder";
                else
                    e.CellData = "File";
            }
            if (e.Column == colSize) {
                if (IsFile(di)) {
                    e.CellData = new FileInfo((string)e.Node).Length;
                }
                else e.CellData = null;
            }
        }


        bool IsFile(DirectoryInfo info) {
            try {
                return (info.Attributes & FileAttributes.Directory) == 0;
            }
            catch {
                return false;
            }
        }
        bool IsDrive(string val) {
            string[] drives = Directory.GetLogicalDrives();
            foreach(string drive in drives) {
                if(drive.Equals(val)) return true;
            }
            return false;
        }
        //</treeList1>


        private void treeList1_GetStateImage(object sender, DevExpress.XtraTreeList.GetStateImageEventArgs e) {
            if(e.Node.GetDisplayText("Type") == "Folder")
                e.NodeImageIndex = e.Node.Expanded ? 1 : 0;
            else if(e.Node.GetDisplayText("Type") == "File") e.NodeImageIndex = 2;
            else e.NodeImageIndex = 3;
        }

        private void treeList1_CustomDrawNodeCell(object sender, DevExpress.XtraTreeList.CustomDrawNodeCellEventArgs e) {
            if(e.Column == this.colSize) {
                if(e.Node.GetDisplayText("Type") == "File") {
                    e.Appearance.TextOptions.HAlignment = DevExpress.Utils.HorzAlignment.Far;
                    e.Appearance.Font = new Font(e.Appearance.Font, FontStyle.Italic);
                    Int64 size = Convert.ToInt64(e.Node.GetValue("Size"));
                    if(size >= 1024)
                        e.CellText = string.Format("{0:### ### ###} KB", size / 1024);
                    else e.CellText = string.Format("{0} Bytes", size);
                }
                else e.CellText = String.Format("<{0}>", e.Node.GetDisplayText("Type"));
            }

            if(e.Column == this.colName) {
                if(e.Node.GetDisplayText("Type") == "File") {
                    e.Appearance.Font = new Font(e.Appearance.Font, FontStyle.Bold);
                }
            }
        }

    }
}