定制个别单元格的外观

可以通过接管 TreeList.NodeCellStyle 事件来定制个别单元格的外观。在单元格被绘制之前，此事件为每个单元格发生。

改变单元格外观的其他方式是接管 TreeList.CustomDrawNodeCell 事件。注意，通过自定义绘制事件改变的元素外观在打印和导出控件时不起作用。要获得更多关于实现自定义绘制的信息，请参阅自定义绘制

下面的示例代码接管了 TreeList.NodeCellStyle 事件来修改“Budget”列中取值大于 500,000 的单元格的外观。

下面的插图展示了运行结果。

C#	复制代码
using DevExpress.XtraTreeList; private void treeList1_NodeCellStyle(object sender, GetCustomNodeCellStyleEventArgs e) { // Modifying the appearance settings used to paint the "Budget" column's cells // whose values are greater than 500,000 . if (e.Column.FieldName != "Budget") return; if (Convert.ToInt32(e.Node.GetValue(e.Column.AbsoluteIndex)) > 500000) { e.Appearance.BackColor = Color.FromArgb(80, 255, 0, 255); e.Appearance.ForeColor = Color.White; e.Appearance.Font = new Font(e.Appearance.Font, FontStyle.Bold); } }

C#

复制代码

using DevExpress.XtraTreeList;

private void treeList1_NodeCellStyle(object sender, GetCustomNodeCellStyleEventArgs e) {
   // Modifying the appearance settings used to paint the "Budget" column's cells
   // whose values are greater than 500,000 .
   if (e.Column.FieldName != "Budget") return;
   if (Convert.ToInt32(e.Node.GetValue(e.Column.AbsoluteIndex)) > 500000) {
      e.Appearance.BackColor = Color.FromArgb(80, 255, 0, 255);
      e.Appearance.ForeColor = Color.White;
      e.Appearance.Font = new Font(e.Appearance.Font, FontStyle.Bold);
   }
}

Visual Basic	复制代码
Imports DevExpress.XtraTreeList Private Sub TreeList1_NodeCellStyle(ByVal sender As Object, _ ByVal e As GetCustomNodeCellStyleEventArgs) Handles TreeList1.CustomNodeCellStyle ' Modifying the appearance settings used to paint the "Budget" column's cells ' whose values are greater than 500,000 . If e.Column.FieldValue <> "Budget" Exit Sub If Convert.ToInt32(e.Node.GetValue(BudgetColumnID)) > 500000 Then e.Appearance.BackColor = Color.FromArgb(80, 255, 0, 255) e.Appearance.ForeColor = Color.White e.Appearance.Font = New Font(e.Appearance.Font, FontStyle.Bold) End If End Sub

Visual Basic

复制代码

Imports DevExpress.XtraTreeList

Private Sub TreeList1_NodeCellStyle(ByVal sender As Object, _
ByVal e As GetCustomNodeCellStyleEventArgs) Handles TreeList1.CustomNodeCellStyle
   ' Modifying the appearance settings used to paint the "Budget" column's cells
   ' whose values are greater than 500,000 .
   If e.Column.FieldValue <> "Budget" Exit Sub
   If Convert.ToInt32(e.Node.GetValue(BudgetColumnID)) > 500000 Then
      e.Appearance.BackColor = Color.FromArgb(80, 255, 0, 255)
      e.Appearance.ForeColor = Color.White
      e.Appearance.Font = New Font(e.Appearance.Font, FontStyle.Bold)
   End If
End Sub

下面的示例代码接管了 TreeList.CustomDrawNodeCell 事件。此事件用于执行节点单元格的自定义绘制。以相同的方式绘制所有节点单元格。但是，可以根据节点设置执行不同的绘制。请参阅 CustomDraw 演示获得更复杂的节点绘制示例。

下面的插图显示了示例代码的运行结果。

C#	复制代码
using System.Drawing; using System.Drawing.Drawing2D; using DevExpress.XtraTreeList; private void treeList1_CustomDrawNodeCell(object sender, CustomDrawNodeCellEventArgs e) { // obtaining brushes for cells of focused and unfocused nodes Brush backBrush, foreBrush; if (e.Node != (sender as TreeList).FocusedNode) { backBrush = new LinearGradientBrush(e.Bounds, Color.Orange, Color.PeachPuff, LinearGradientMode.Horizontal); foreBrush = new SolidBrush(Color.Black); } else { backBrush = new SolidBrush(Color.DarkBlue); foreBrush = new SolidBrush(Color.PeachPuff); } // filling the background e.Graphics.FillRectangle(backBrush, e.Bounds); // painting node value e.Graphics.DrawString(e.CellText, e.Appearance.Font, foreBrush, e.Bounds, e.Appearance.GetStringFormat()); // prohibiting default painting e.Handled = true; }

C#

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using System.Drawing;
using System.Drawing.Drawing2D;
using DevExpress.XtraTreeList;

private void treeList1_CustomDrawNodeCell(object sender, CustomDrawNodeCellEventArgs e) {
   // obtaining brushes for cells of focused and unfocused nodes
   Brush backBrush, foreBrush;
   if (e.Node != (sender as TreeList).FocusedNode) {
      backBrush = new LinearGradientBrush(e.Bounds, Color.Orange, Color.PeachPuff, 
        LinearGradientMode.Horizontal);
      foreBrush = new SolidBrush(Color.Black);
   }
   else {
      backBrush = new SolidBrush(Color.DarkBlue);
      foreBrush = new SolidBrush(Color.PeachPuff);
   }
   // filling the background
   e.Graphics.FillRectangle(backBrush, e.Bounds);
   // painting node value
   e.Graphics.DrawString(e.CellText, e.Appearance.Font, foreBrush, e.Bounds, 
     e.Appearance.GetStringFormat());

   // prohibiting default painting
   e.Handled = true;
}

Visual Basic	复制代码
Imports System.Drawing Imports System.Drawing.Drawing2D Imports DevExpress.XtraTreeList Private Sub TreeList1_CustomDrawNodeCell(ByVal sender As Object, _ ByVal e As CustomDrawNodeCellEventArgs) Handles TreeList1.CustomDrawNodeCell ' obtaining brushes for cells of focused and unfocused nodes Dim BackBrush, ForeBrush As Brush If e.Node.Id <> sender.FocusedNode.Id Then BackBrush = New LinearGradientBrush(e.Bounds, Color.Orange, Color.PeachPuff, _ LinearGradientMode.Horizontal) ForeBrush = New SolidBrush(Color.Black) Else BackBrush = New SolidBrush(Color.DarkBlue) ForeBrush = New SolidBrush(Color.PeachPuff) End If ' filling the background e.Graphics.FillRectangle(BackBrush, e.Bounds) ' painting node value Dim ValueRect As New RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, _ e.Bounds.Height) e.Graphics.DrawString(e.CellText, e.Appearance.Font, ForeBrush, ValueRect, _ e.Appearance.GetStringFormat()) ' prohibiting default painting e.Handled = True End Sub

Visual Basic

复制代码

Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports DevExpress.XtraTreeList

Private Sub TreeList1_CustomDrawNodeCell(ByVal sender As Object, _
ByVal e As CustomDrawNodeCellEventArgs) Handles TreeList1.CustomDrawNodeCell
   ' obtaining brushes for cells of focused and unfocused nodes
   Dim BackBrush, ForeBrush As Brush
   If e.Node.Id <> sender.FocusedNode.Id Then
      BackBrush = New LinearGradientBrush(e.Bounds, Color.Orange, Color.PeachPuff, _
        LinearGradientMode.Horizontal)
      ForeBrush = New SolidBrush(Color.Black)
   Else
      BackBrush = New SolidBrush(Color.DarkBlue)
      ForeBrush = New SolidBrush(Color.PeachPuff)
   End If
   ' filling the background
   e.Graphics.FillRectangle(BackBrush, e.Bounds)
   ' painting node value
   Dim ValueRect As New RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, _
     e.Bounds.Height)
   e.Graphics.DrawString(e.CellText, e.Appearance.Font, ForeBrush, ValueRect, _
     e.Appearance.GetStringFormat())

   ' prohibiting default painting
   e.Handled = True
End Sub