VGridControlBase.CustomDrawRowValueCell Event

Enables data cells to be painted manually.

Namespace: DevExpress.XtraVerticalGrid

Assembly: DevExpress.XtraVerticalGrid.v23.2.dll

NuGet Packages: DevExpress.Win.Navigation, DevExpress.Win.VerticalGrid

Declaration

C#

public event CustomDrawRowValueCellEventHandler CustomDrawRowValueCell

VB.NET

Public Event CustomDrawRowValueCell As CustomDrawRowValueCellEventHandler

Event Data

The CustomDrawRowValueCell event's data class is CustomDrawRowValueCellEventArgs. The following properties provide information specific to this event:

Property	Description
Appearance	Gets the painted element’s appearance settings. Inherited from CustomDrawEventArgs.
Bounds	Gets a value specifying limits for the drawing area. Inherited from CustomDrawEventArgs.
Cache	Gets an object which specifies the storage for the most used pens, fonts and brushes. Inherited from CustomDrawEventArgs.
CellIndex	Gets the index of the painted row data cell.
CellText	Gets or sets the text displayed in the painted cell.
CellValue	Gets the painted cell’s value.
Enabled	Gets a value indicating whether end-users can modify cell values within the painted row.
Graphics	Gets an object used to paint. Inherited from CustomDrawEventArgs.
Handled	Gets or sets a value specifying whether an event was handled, if handled, default actions are not required. Inherited from CustomDrawEventArgs.
IsRightToLeft	Gets a value indicating whether the VGridControl‘s elements are aligned to support locales using right-to-left fonts. Inherited from CustomDrawEventArgs.
Item	Returns the RepositoryItem for which the VGridControlBase.CustomDrawRowValueCell event was raised.
ObjectArgs	Gets an object containing information about the painted element. Inherited from CustomDrawEventArgs.
Painter	Gets the painter object that provides the default element’s painting mechanism. Inherited from CustomDrawEventArgs.
Properties	Provides properties specific to the row being custom painted. Inherited from CustomDrawRowEventArgs.
RecordIndex	Gets the index of the painted cell’s record.
Row	Gets the row whose element is to be drawn. Inherited from CustomDrawRowEventArgs.
RowValueInfo	Gets information on the row value view.

The event data class exposes the following methods:

Method	Description
DefaultDraw()	Performs default painting of an element. Inherited from CustomDrawEventArgs.
DrawHtml(HtmlTemplate, DxHtmlPainterContext, Action<DxHtmlPainterArgs>)	Paints the required HTML template inside an element that raised this event. The context parameter allows you to assign an object that transfers mouse events to template elements. Inherited from CustomDrawEventArgs.
DrawHtml(HtmlTemplate, Action<DxHtmlPainterArgs>)	Paints the required HTML template inside an element that raised this event. Inherited from CustomDrawEventArgs.

Remarks

The CustomDrawRowValueCell event is raised before a data cell is painted. The cell is identified by the event parameter’s CustomDrawRowEventArgs.Row, CustomDrawRowValueCellEventArgs.RecordIndex and CustomDrawRowValueCellEventArgs.CellIndex properties.

The CustomDrawRowValueCell event can be used for two purposes:

• To manually paint all or only particular data cells. Note that you need to set the CustomDrawEventArgs.Handled parameter to true to indicate that the default painting is not required for the cell.
• Change the cell’s settings (text, appearance, etc.) and leave the CustomDrawEventArgs.Handled parameter set to false. This will paint cells using the default mechanism but with modified settings.

Important

Do not change cell values, modify the control’s layout, or change the control’s object model in the events used for custom control painting. Actions that update the layout can cause the control to malfunction.

Example

The following sample code handles the VGridControlBase.CustomDrawRowHeaderCell, VGridControlBase.CustomDrawRowValueCell and VGridControlBase.CustomDrawSeparator events to custom paint cells in a multi-editor row.

C#

using DevExpress.XtraVerticalGrid.Rows;

using System.Drawing.Drawing2D;
using DevExpress.XtraVerticalGrid.Events;

private void Form1_Load(object sender, EventArgs e) {
    vGridControl1.OptionsView.ShowRootLevelIndent = false;
    MultiEditorRow meRow = (vGridControl1.Rows[0] as MultiEditorRow);
    if (meRow != null) {
        meRow.SeparatorKind = SeparatorKind.String;
        meRow.SeparatorString = "/";
    }
}

Font fontRegular = new Font("Tahoma", 10);
Font fontBold = new Font("Tahoma", 10, FontStyle.Bold);

private void vGridControl1_CustomDrawSeparator(object sender, DevExpress.XtraVerticalGrid.Events.CustomDrawSeparatorEventArgs e) {
   Font font = fontRegular;
    Brush brush = Brushes.Orange;
    if(e.IsHeaderSeparator) {
        font = fontBold;
        brush = Brushes.LightGray;
    }
    e.Cache.FillRectangle(brush, e.Bounds);
    e.Cache.DrawString("/", font, Brushes.DarkBlue, e.Bounds, e.Appearance.GetStringFormat());
    e.Handled = true;
}

private void vGridControl1_CustomDrawRowValueCell(object sender, DevExpress.XtraVerticalGrid.Events.CustomDrawRowValueCellEventArgs e) {
    e.Cache.FillRectangle(Brushes.Orange, Rectangle.Inflate(e.Bounds, 1, 1));
    e.Cache.DrawString(e.CellText, e.Appearance.Font, Brushes.Black, e.Bounds, e.Appearance.GetStringFormat());
    e.Handled = true;
}

private void vGridControl1_CustomDrawRowHeaderCell(object sender, DevExpress.XtraVerticalGrid.Events.CustomDrawRowHeaderCellEventArgs e) {
    Rectangle rect = Rectangle.Inflate(e.Bounds, 1, 1);
    Rectangle rectText = Rectangle.Inflate(e.Bounds, -2, 0);
    e.Cache.FillRectangle(Brushes.LightGray, rect);
    e.Cache.DrawString(e.Caption, e.Appearance.Font, Brushes.Black, rectText, e.Appearance.GetStringFormat());
    e.Handled = true;
}

VB.NET

Imports DevExpress.XtraVerticalGrid.Rows

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    VGridControl1.OptionsView.ShowRootLevelIndent = False
    Dim meRow As MultiEditorRow = (TryCast(VGridControl1.Rows(0), MultiEditorRow))
    If Not meRow Is Nothing Then
        meRow.SeparatorKind = SeparatorKind.String
        meRow.SeparatorString = "/"
    End If
End Sub

Private fontRegular As Font = New Font("Tahoma", 10)
Private fontBold As Font = New Font("Tahoma", 10, FontStyle.Bold)

Private Sub VGridControl1_CustomDrawRowValueCell(sender As Object, e As DevExpress.XtraVerticalGrid.Events.CustomDrawRowValueCellEventArgs) Handles VGridControl1.CustomDrawRowValueCell
    e.Cache.FillRectangle(Brushes.Orange, Rectangle.Inflate(e.Bounds, 1, 1))
    e.Cache.DrawString(e.CellText, e.Appearance.Font, Brushes.Black, e.Bounds, e.Appearance.GetStringFormat())
    e.Handled = True
End Sub

Private Sub VGridControl1_CustomDrawRowHeaderCell(sender As Object, e As DevExpress.XtraVerticalGrid.Events.CustomDrawRowHeaderCellEventArgs) Handles VGridControl1.CustomDrawRowHeaderCell
    Dim rect As Rectangle = Rectangle.Inflate(e.Bounds, 1, 1)
    Dim rectText As Rectangle = Rectangle.Inflate(e.Bounds, -2, 0)
    e.Cache.FillRectangle(Brushes.LightGray, rect)
    e.Cache.DrawString(e.Caption, e.Appearance.Font, Brushes.Black, rectText, e.Appearance.GetStringFormat())
    e.Handled = True
End Sub

Private Sub VGridControl1_CustomDrawSeparator(sender As Object, e As DevExpress.XtraVerticalGrid.Events.CustomDrawSeparatorEventArgs) Handles VGridControl1.CustomDrawSeparator
    Dim font As Font = fontRegular
    Dim brush As Brush = Brushes.Orange
    If e.IsHeaderSeparator Then
        font = fontBold
        brush = Brushes.LightGray
    End If
    e.Cache.FillRectangle(brush, e.Bounds)
    e.Cache.DrawString("/", font, Brushes.DarkBlue, e.Bounds, e.Appearance.GetStringFormat())
    e.Handled = True
End Sub