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c#教程之C#自定义DataGridViewColumn显示TreeView
- 2018-04-24 19:48 来源:未知
新疆25选7开奖号码 www.d1dx0.cn 我们可以自定义DataGridView的DataGridViewColumn来实现自定义的列,下面介绍一下如何通过扩展DataGridViewColumn来实现一个TreeViewColumn
1.TreeViewColumn类
TreeViewColumn继承自DataGridViewColumn,为了动态给TreeViewColumn传入一个TreeView,这里暴露出一个公共属性_root,可以绑定一个初始化的TreeView. 另外需要重写DataGridCell类型的CellTemplate,这里返还一个TreeViewCell(需要自定义)
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/// <summary> /// Host TreeView In DataGridView Cell /// </summary> public class TreeViewColumn : DataGridViewColumn { public TreeViewColumn() : base ( new TreeViewCell()) { } [Description( "Set TreeView Root in DataGridView Cell" ), Category( "TreeView" )] public TreeView _root { get { return Roots.tree;} set {Roots.tree=value;} } public override DataGridViewCell CellTemplate { get { return base .CellTemplate; } set { // Ensure that the cell used for the template is a TreeViewCell. if (value != null && !value.GetType().IsAssignableFrom( typeof (TreeViewCell))) { throw new InvalidCastException( "Must be a TreeViewCell" ); } base .CellTemplate = value; } } } |
2.TreeViewCell类
上面TreeViewColumn重写了CellTemplate,返回的就是自定义的TreeViewCell,这里就是具体实现其逻辑。一般来说选择树控件的节点后,返回的是一个文本信息,是文本类型,可以继承DataGridViewTextBoxCell,并重写InitializeEditingControl来进行自定义的DataGridView.EditingControl (编辑控件)。
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public class TreeViewCell : DataGridViewTextBoxCell { public TreeViewCell() : base () { //初始设置 } 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); TreeViewEditingControl ctl = DataGridView.EditingControl as TreeViewEditingControl; // Use the default row value when Value property is null. if ( this .Value == null ) { ctl.SelectedNode = new TreeNode( this .DefaultNewRowValue.ToString()); } else { ctl.SelectedNode = new TreeNode( this .Value.ToString()); } } public override Type EditType { get { // Return the type of the editing control that CalendarCell uses. return typeof (TreeViewEditingControl); } } public override Type ValueType { get { // Return the type of the value that CalendarCell contains. return typeof (String); } } public override object DefaultNewRowValue { get { // Use the current date and time as the default value. return "" ; } } } |
3.TreeViewEditingControl类
TreeViewEditingControl为编辑控件,当用户编辑TreeViewCell时,显示的为树编辑控件,需要继承TreeView,同时实现IDataGridViewEditingControl接口,实现以下方法:
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public class TreeViewEditingControl : TreeView, IDataGridViewEditingControl { DataGridView dataGridView; private bool valueChanged = false ; int rowIndex; public TreeViewEditingControl() { try { //必须加Roots.tree.Nodes[].Clone() 否则报错 不能在多处增添或插入项,必须首先将其从当前位置移除或将其克隆 this .Nodes.Add(Roots.tree.Nodes[].Clone() as TreeNode); this .SelectedNode = this .Nodes[]; } catch (Exception ex) { MessageBox.Show(ex.Message); } } // Implements the IDataGridViewEditingControl.EditingControlFormattedValue // property. public object EditingControlFormattedValue { get { return this .SelectedNode.Text; } set { if (value is String) { try { // This will throw an exception of the string is // null, empty, or not in the format of a date. this .SelectedNode = new TreeNode((String)value); } catch { // In the case of an exception, just use the // default value so we're not left with a null // value. this .SelectedNode = new TreeNode( "" ); } } } } // Implements the // IDataGridViewEditingControl.GetEditingControlFormattedValue method. public object GetEditingControlFormattedValue( DataGridViewDataErrorContexts context) { return EditingControlFormattedValue; } // Implements the // IDataGridViewEditingControl.ApplyCellStyleToEditingControl method. public void ApplyCellStyleToEditingControl( DataGridViewCellStyle dataGridViewCellStyle) { this .Font = dataGridViewCellStyle.Font; this .ForeColor = dataGridViewCellStyle.ForeColor; this .BackColor = dataGridViewCellStyle.BackColor; } // Implements the IDataGridViewEditingControl.EditingControlRowIndex // property. public int EditingControlRowIndex { get { return rowIndex; } set { rowIndex = value; } } // Implements the IDataGridViewEditingControl.EditingControlWantsInputKey // method. public bool EditingControlWantsInputKey( Keys key, bool dataGridViewWantsInputKey) { // Let the TreeViewPicker handle the keys listed. 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; } } // Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit // method. public void PrepareEditingControlForEdit( bool selectAll) { // No preparation needs to be done. } // Implements the IDataGridViewEditingControl // .RepositionEditingControlOnValueChange property. public bool RepositionEditingControlOnValueChange { get { return false ; } } // Implements the IDataGridViewEditingControl // .EditingControlDataGridView property. public DataGridView EditingControlDataGridView { get { return dataGridView; } set { dataGridView = value; } } // Implements the IDataGridViewEditingControl // .EditingControlValueChanged property. public bool EditingControlValueChanged { get { return valueChanged; } set { valueChanged = value; } } // Implements the IDataGridViewEditingControl // .EditingPanelCursor property. public Cursor EditingPanelCursor { get { return base .Cursor; } } protected override void OnAfterExpand(TreeViewEventArgs e) { base .OnAfterExpand(e); this .dataGridView.Columns[ this .dataGridView.CurrentCell.ColumnIndex].Width = this .Width+; this .dataGridView.Rows[ this .dataGridView.CurrentCell.RowIndex].Height = this .Height+; } protected override void OnAfterSelect(TreeViewEventArgs e) { // Notify the DataGridView that the contents of the cell // have changed. valueChanged = true ; this .EditingControlDataGridView.NotifyCurrentCellDirty( true ); base .OnAfterSelect(e); } } |
为了在不同类之间传递参数,定义一个全局静态类:
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/// <summary> /// 静态类的静态属性,用于在不同class间传递参数 /// </summary> public static class Roots { //从前台绑定树 public static TreeView tree = null ; } |
完整代码为:
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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows.Forms; using System.ComponentModel; namespace Host_Controls_in_Windows_Forms_DataGridView_Cells { /// <summary> /// 静态类的静态属性,用于在不同class间传递参数 /// </summary> public static class Roots { //从前台绑定树 public static TreeView tree = null ; } /// <summary> /// Host TreeView In DataGridView Cell /// </summary> public class TreeViewColumn : DataGridViewColumn { public TreeViewColumn() : base ( new TreeViewCell()) { } [Description( "Set TreeView Root in DataGridView Cell" ), Category( "TreeView" )] public TreeView _root { get { return Roots.tree;} set {Roots.tree=value;} } public override DataGridViewCell CellTemplate { get { return base .CellTemplate; } set { // Ensure that the cell used for the template is a TreeViewCell. if (value != null && !value.GetType().IsAssignableFrom( typeof (TreeViewCell))) { throw new InvalidCastException( "Must be a TreeViewCell" ); } base .CellTemplate = value; } } } //---------------------------------------------------------------------- public class TreeViewCell : DataGridViewTextBoxCell { public TreeViewCell() : base () { //初始设置 } 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); TreeViewEditingControl ctl = DataGridView.EditingControl as TreeViewEditingControl; // Use the default row value when Value property is null. if ( this .Value == null ) { ctl.SelectedNode = new TreeNode( this .DefaultNewRowValue.ToString()); } else { ctl.SelectedNode = new TreeNode( this .Value.ToString()); } } public override Type EditType { get { // Return the type of the editing control that CalendarCell uses. return typeof (TreeViewEditingControl); } } public override Type ValueType { get { // Return the type of the value that CalendarCell contains. return typeof (String); } } public override object DefaultNewRowValue { get { // Use the current date and time as the default value. return "" ; } } } //----------------------------------------------------------------- public class TreeViewEditingControl : TreeView, IDataGridViewEditingControl { DataGridView dataGridView; private bool valueChanged = false ; int rowIndex; public TreeViewEditingControl() { try { //必须加Roots.tree.Nodes[].Clone() 否则报错 不能在多处增添或插入项,必须首先将其从当前位置移除或将其克隆 this .Nodes.Add(Roots.tree.Nodes[].Clone() as TreeNode); this .SelectedNode = this .Nodes[]; } catch (Exception ex) { MessageBox.Show(ex.Message); } } // Implements the IDataGridViewEditingControl.EditingControlFormattedValue // property. public object EditingControlFormattedValue { get { return this .SelectedNode.Text; } set { if (value is String) { try { // This will throw an exception of the string is // null, empty, or not in the format of a date. this .SelectedNode = new TreeNode((String)value); } catch { // In the case of an exception, just use the // default value so we're not left with a null // value. this .SelectedNode = new TreeNode( "" ); } } } } // Implements the // IDataGridViewEditingControl.GetEditingControlFormattedValue method. public object GetEditingControlFormattedValue( DataGridViewDataErrorContexts context) { return EditingControlFormattedValue; } // Implements the // IDataGridViewEditingControl.ApplyCellStyleToEditingControl method. public void ApplyCellStyleToEditingControl( DataGridViewCellStyle dataGridViewCellStyle) { this .Font = dataGridViewCellStyle.Font; this .ForeColor = dataGridViewCellStyle.ForeColor; this .BackColor = dataGridViewCellStyle.BackColor; } // Implements the IDataGridViewEditingControl.EditingControlRowIndex // property. public int EditingControlRowIndex { get { return rowIndex; } set { rowIndex = value; } } // Implements the IDataGridViewEditingControl.EditingControlWantsInputKey // method. public bool EditingControlWantsInputKey( Keys key, bool dataGridViewWantsInputKey) { // Let the TreeViewPicker handle the keys listed. 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; } } // Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit // method. public void PrepareEditingControlForEdit( bool selectAll) { // No preparation needs to be done. } // Implements the IDataGridViewEditingControl // .RepositionEditingControlOnValueChange property. public bool RepositionEditingControlOnValueChange { get { return false ; } } // Implements the IDataGridViewEditingControl // .EditingControlDataGridView property. public DataGridView EditingControlDataGridView { get { return dataGridView; } set { dataGridView = value; } } // Implements the IDataGridViewEditingControl // .EditingControlValueChanged property. public bool EditingControlValueChanged { get { return valueChanged; } set { valueChanged = value; } } // Implements the IDataGridViewEditingControl // .EditingPanelCursor property. public Cursor EditingPanelCursor { get { return base .Cursor; } } protected override void OnAfterExpand(TreeViewEventArgs e) { base .OnAfterExpand(e); this .dataGridView.Columns[ this .dataGridView.CurrentCell.ColumnIndex].Width = this .Width+; this .dataGridView.Rows[ this .dataGridView.CurrentCell.RowIndex].Height = this .Height+; } protected override void OnAfterSelect(TreeViewEventArgs e) { // Notify the DataGridView that the contents of the cell // have changed. valueChanged = true ; this .EditingControlDataGridView.NotifyCurrentCellDirty( true ); base .OnAfterSelect(e); } } } |
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