■ TreeList 클래스의 BeforeExpand 이벤트를 사용해 언바운드 모드의 데이터를 동적으로 로딩하는 방법을 보여준다.
▶ MainForm.cs
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using System.IO; using System.Windows.Forms; using DevExpress.Utils; using DevExpress.XtraEditors; using DevExpress.XtraTreeList; using DevExpress.XtraTreeList.Columns; using DevExpress.XtraTreeList.Nodes; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : XtraForm { //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); TreeListColumn fullNameColumn = new TreeListColumn(); fullNameColumn.FieldName = "FullName"; fullNameColumn.Caption = "FullName"; TreeListColumn nameColumn = new TreeListColumn(); nameColumn.FieldName = "Name"; nameColumn.Caption = "Name"; nameColumn.MinWidth = 30; nameColumn.Width = 250; nameColumn.VisibleIndex = 0; TreeListColumn typeColumn = new TreeListColumn(); typeColumn.FieldName = "Type"; typeColumn.Caption = "Type"; typeColumn.Width = 100; typeColumn.VisibleIndex = 1; TreeListColumn sizeColumn = new TreeListColumn(); sizeColumn.FieldName = "Size"; sizeColumn.Caption = "Size(Bytes)"; sizeColumn.AppearanceCell.Options.UseTextOptions = true; sizeColumn.AppearanceCell.TextOptions.HAlignment = HorzAlignment.Far; sizeColumn.Format.FormatType = FormatType.Numeric; sizeColumn.Format.FormatString = "n0"; sizeColumn.Width = 100; sizeColumn.VisibleIndex = 2; this.treeList.Columns.AddRange ( new TreeListColumn[] { fullNameColumn, nameColumn, typeColumn, sizeColumn } ); this.treeList.OptionsView.AutoWidth = false; this.treeList.OptionsBehavior.AutoNodeHeight = false; this.treeList.OptionsBehavior.Editable = false; this.treeList.StateImageList = this.imageList; this.treeList.BeforeExpand += treeList_BeforeExpand; this.treeList.AfterExpand += treeList_AfterExpand; this.treeList.AfterCollapse += treeList_AfterCollapse; AddFolderNode("C:\\", null); this.treeList.BestFitColumns(); } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 트리 리스트 확장 전 처리하기 - treeList_BeforeExpand(sender, e) /// <summary> /// 트리 리스트 확장 전 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void treeList_BeforeExpand(object sender, BeforeExpandEventArgs e) { if(e.Node.Tag != null) { Cursor cursor = Cursor.Current; Cursor.Current = Cursors.WaitCursor; AddFolderNode(e.Node.GetDisplayText("FullName"), e.Node); e.Node.Tag = null; Cursor.Current = cursor; } } #endregion #region 트리 리스트 확장 후 처리하기 - treeList_AfterExpand(sender, e) /// <summary> /// 트리 리스트 확장 후 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void treeList_AfterExpand(object sender, NodeEventArgs e) { if(e.Node.StateImageIndex != 1) { e.Node.StateImageIndex = 2; } } #endregion #region 트리 리스트 축소 후 처리하기 - treeList_AfterCollapse(sender, e) /// <summary> /// 트리 리스트 축소 후 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void treeList_AfterCollapse(object sender, NodeEventArgs e) { if(e.Node.StateImageIndex != 1) { e.Node.StateImageIndex = 0; } } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 파일 소유 여부 구하기 - HasFile(parentPath) /// <summary> /// 파일 소유 여부 구하기 /// </summary> /// <param name="parentPath">부모 경로</param> /// <returns>파일 소유 여부</returns> private bool HasFile(string parentPath) { string[] pathArray = Directory.GetFiles(parentPath); if(pathArray.Length > 0) { return true; } pathArray = Directory.GetDirectories(parentPath); if(pathArray.Length > 0) { return true; } return false; } #endregion #region 파일 노드 추가하기 - AddFileNode(parentPath, parentNode) /// <summary> /// 파일 노드 추가하기 /// </summary> /// <param name="parentPath">부모 경로</param> /// <param name="parentNode">부모 노드</param> private void AddFileNode(string parentPath, TreeListNode parentNode) { TreeListNode node; FileInfo fileInfo; try { string[] pathArray = Directory.GetFiles(parentPath); foreach(string path in pathArray) { fileInfo = new FileInfo(path); node = this.treeList.AppendNode ( new object[] { path, fileInfo.Name, "File", fileInfo.Length }, parentNode ); node.StateImageIndex = 1; node.HasChildren = false; } } catch { } } #endregion #region 폴더 노드 추가하기 - AddFolderNode(parentPath, parentNode) /// <summary> /// 폴더 노드 추가하기 /// </summary> /// <param name="parentPath">부모 경로</param> /// <param name="parentNode">부모 노드</param> private void AddFolderNode(string parentPath, TreeListNode parentNode) { this.treeList.BeginUnboundLoad(); TreeListNode node; DirectoryInfo directoryInfo; try { string[] pathArray = Directory.GetDirectories(parentPath); foreach(string path in pathArray) { try { directoryInfo = new DirectoryInfo(path); node = treeList.AppendNode ( new object[] { path, directoryInfo.Name, "Folder", null }, parentNode ); node.StateImageIndex = 0; node.HasChildren = HasFile(path); if(node.HasChildren) { node.Tag = true; } } catch { } } } catch { } AddFileNode(parentPath, parentNode); this.treeList.EndUnboundLoad(); } #endregion } } |
