Windows窗体DataGridView单元中的主机TreeView

我想为DataGridView创建一个TreeView列。 我在这里通过扩展TreeView 来跟踪示例，如下所示。

public class TreeViewEditingControl : TreeView, IDataGridViewEditingControl public class TreeViewCell : DataGridViewComboBoxCell // Not sure whether this should be DataGridViewTextBoxCell 

这是我的问题。 我可以在单元格中看到Treeview，但是我不知道当用户单击一个单元格时（如ComboBox扩展），如何增加Cell / TreeView的高度。 有没有人对此有任何想法？

Answer 1

我会生成一个带有TreeCtrl Docked的新的无边框表单，我用CalendarControl完成了它，它运行良好。 如果将表单的左上角设置为正在编辑的单元格的左上角，则用户将不会知道区别。 希望这是你正在寻找的。

编辑：

这是我为文件选择单元格所做的实现。 当您单击它进行编辑时，它会在单元格中显示一个“浏览”按钮，它会打开一个FileOpenDialog。 代码很冗长，但我认为您可以选择需要实现的部分。

 public class DataGridViewFileColumn : DataGridViewColumn { public DataGridViewFileColumn() : base(new DataGridViewFileCell()) { BrowseLabel = "..."; SaveFullPath = false; } public override DataGridViewCell CellTemplate { get { return base.CellTemplate; } set { // Ensure that the cell used for the template is a DataGridViewFileCell. if (value != null && !value.GetType().IsAssignableFrom(typeof(DataGridViewFileCell))) { throw new InvalidCastException("Must be a DataGridViewFileCell"); } base.CellTemplate = value; } } [Description("Label to place on Browse button"),Category("Appearance")] [DefaultValue("...")] public string BrowseLabel { get; set; } [Description("Save full path name"), Category("Behavior")] [DefaultValue(true)] public bool SaveFullPath { get; set; } } public class DataGridViewFileCell : DataGridViewTextBoxCell { public DataGridViewFileCell() : base() { } public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle) { // Set the value of the editing control to the current cell value. base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle); FileEditingControl ctl = (FileEditingControl)DataGridView.EditingControl; // Use the default row value when Value property is null. if (this.Value == null) { ctl.Filename = this.DefaultNewRowValue.ToString(); } else { ctl.Filename = this.Value.ToString(); } } public override Type EditType { get { // Return the type of the editing control that DataGridViewFileCell uses. return typeof(FileEditingControl); } } public override Type ValueType { get { // Return the type of the value that DataGridViewFileCell contains. return typeof(string); } } } class FileEditingControl : FileTextBox, IDataGridViewEditingControl { DataGridView dataGridView; private bool valueChanged = false; int rowIndex; public FileEditingControl() { } #region IDataGridViewEditingControl implementations public object EditingControlFormattedValue { get { return Filename; } set { if (value is String) { try { Filename = (String)value; } catch { Filename = value.ToString(); } } } } public object GetEditingControlFormattedValue( DataGridViewDataErrorContexts context) { return EditingControlFormattedValue; } public void ApplyCellStyleToEditingControl( DataGridViewCellStyle dataGridViewCellStyle) { this.Font = dataGridViewCellStyle.Font; } public int EditingControlRowIndex { get { return rowIndex; } set { rowIndex = value; } } public bool EditingControlWantsInputKey( Keys key, bool dataGridViewWantsInputKey) { switch (key & Keys.KeyCode) { case Keys.Left: case Keys.Up: case Keys.Down: case Keys.Right: case Keys.Home: case Keys.End: case Keys.PageDown: case Keys.PageUp: return true; default: return !dataGridViewWantsInputKey; } } public void PrepareEditingControlForEdit(bool selectAll) { } public bool RepositionEditingControlOnValueChange { get { return false; } } public DataGridView EditingControlDataGridView { get { return dataGridView; } set { dataGridView = value; } } public bool EditingControlValueChanged { get { return valueChanged; } set { valueChanged = value; } } public Cursor EditingPanelCursor { get { return base.Cursor; } } #endregion protected override void OnValueChanged(FileEventArgs eventargs) { // Notify the DataGridView that the contents of the cell // have changed. valueChanged = true; this.EditingControlDataGridView.NotifyCurrentCellDirty(true); base.OnValueChanged(eventargs); } } public partial class FileTextBox : UserControl { #region Constructors public FileTextBox() { InitializeComponent(); Tooltip = new ToolTip(); SaveFullPath = false; AllowMultipleFiles = false; BrowseLabel = "..."; } #endregion Constructors #region Properties /// 
 /// Tooltip object used to show full path name /// 
 private ToolTip Tooltip; /// 
 /// Return the full path or just the filename? /// 
 [Description("Save Full Path"), Category("Behavior")] [DefaultValue(false)] public bool SaveFullPath { get; set; } /// 
 /// String representing the filename for this control /// 
 public override string Text { get { return base.Text; } set { if (base.Text != value) { base.Text = value; Tooltip.SetToolTip(this, base.Text); Invalidate(); OnValueChanged(new FileEventArgs(base.Text)); } } } [Description("Browse Label"), Category("Appearance")] [DefaultValue("...")] public string BrowseLabel { get { return Browse.Text; } set { Browse.Text = value; Browse.Width = TextRenderer.MeasureText(Browse.Text, Browse.Font).Width + 8; Browse.Location = new Point(this.Width - Browse.Width, Browse.Location.Y); } } [Description("Allow Multiple Files"), Category("Behavior")] [DefaultValue(false)] public bool AllowMultipleFiles { get; set; } /// 
 /// Selected filename (same as Text property) /// 
 [Description("Filename"), Category("Data")] public string Filename { get { return Text; } set { Text = value; } } #endregion Properties #region Event Handlers /// 
 /// Event raised when /// 
 public event EventHandler ValueChanged; protected virtual void OnValueChanged(FileEventArgs eventargs) { eventargs.Filename = Filename; if (this.ValueChanged != null) this.ValueChanged(this, eventargs); } private void Browse_Click(object sender, EventArgs e) { OpenFileDialog dlg = new OpenFileDialog(); dlg.FileName = Text; dlg.Multiselect = AllowMultipleFiles; if (dlg.ShowDialog() == DialogResult.OK) { if (SaveFullPath) Text = dlg.FileName; else Text = dlg.SafeFileName; } } protected override void OnPaint(PaintEventArgs e) { // Draw the client window Rectangle r = new Rectangle(new Point(0, 0), new Size(Size.Width-1, Size.Height-1)); Graphics g = e.Graphics; g.FillRectangle(new SolidBrush(SystemColors.Window), r); g.DrawRectangle(new Pen(VisualStyleInformation.TextControlBorder), r); rY += Margin.Top; r.Width -= Browse.Width; // Fill with Text TextRenderer.DrawText(g, Text, Font, r, ForeColor, TextFormatFlags.PathEllipsis); base.OnPaint(e); } private void FileTextBox_DragDrop(object sender, DragEventArgs e) { DataObject data = (DataObject)e.Data; StringCollection filenames = data.GetFileDropList(); if ( filenames.Count == 1) Text = filenames[0]; } private void FileTextBox_DragEnter(object sender, DragEventArgs e) { DataObject data = (DataObject)e.Data; StringCollection filenames = data.GetFileDropList(); if (/*!AllowMultipleFiles &&*/ filenames.Count == 1) e.Effect = DragDropEffects.Link; } #endregion Event Handlers } public class FileEventArgs : EventArgs { public FileEventArgs(string Text) { Filename = Text; } /// 
 /// Name of the file in the control /// 
 public String Filename { get; set; } }