GridView.CustomDrawRowFooterCell Event

Enables you to paint group footer cells manually.

Namespace: DevExpress.XtraGrid.Views.Grid

Assembly: DevExpress.XtraGrid.v20.1.dll

Declaration

[DXCategory("CustomDraw")]
public event FooterCellCustomDrawEventHandler CustomDrawRowFooterCell
<DXCategory("CustomDraw")>
Public Event CustomDrawRowFooterCell As FooterCellCustomDrawEventHandler

Event Data

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

Property Description
Appearance Gets the painted element's appearance settings. Inherited from CustomDrawEventArgs.
Bounds Returns a value specifying limits for the drawing area. Inherited from CustomDrawEventArgs.
Cache Provides methods to paint on drawing surfaces in GDI+ and DirectX modes. See DirectX hardware acceleration to learn more. Inherited from CustomDrawEventArgs.
Column Gets the column containing the painted element. Inherited from RowCellObjectCustomDrawEventArgs.
Graphics A GDI+ drawing surface. Use the CustomDrawEventArgs.Cache property instead if you enable the DirectX hardware acceleration. Inherited from CustomDrawEventArgs.
Handled Gets or sets a value specifying whether an event was handled and that the default element painting is therefore not required. Inherited from CustomDrawEventArgs.
Info Gets an object providing information necessary to paint a footer cell.
Painter Gets the painter object that provides the default element painting mechanism. Inherited from CustomDrawObjectEventArgs.
RowHandle Gets the handle of the row whose corresponding element is being painted. Inherited from RowObjectCustomDrawEventArgs.

Remarks

The CustomDrawRowFooterCell event fires each time a group footer cell needs to be repainted. The cell's column is identified by the RowCellObjectCustomDrawEventArgs.Column parameter. The cell's row can be determined using the RowObjectCustomDrawEventArgs.RowHandle parameter.

See the Custom Painting Basics and Custom Painting Scenarios topics for information on using custom draw events.

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.

Examples

The example shows how you can customize group footers and their cells by handling the GridView.CustomDrawRowFooter and GridView.CustomDrawRowFooterCell events.

CustomDraw - GroupRowFooter

gridView1.OptionsView.GroupFooterShowMode = GroupFooterShowMode.VisibleAlways;
gridView1.CustomDrawRowFooter += (sender, e) =>
{
    e.Cache.FillRectangle(e.Cache.GetGradientBrush(e.Bounds, Color.Red, Color.Maroon, System.Drawing.Drawing2D.LinearGradientMode.Horizontal), e.Bounds);
    //Prevent default painting
    e.Handled = true;
};

GridGroupSummaryItem item = new GridGroupSummaryItem() {
    FieldName = "MPG Highway",
    SummaryType = DevExpress.Data.SummaryItemType.Sum,
    ShowInGroupColumnFooter = gridView1.Columns["MPG Highway"]
};
gridView1.GroupSummary.Add(item);
gridView1.CustomDrawRowFooterCell += (sender, e) =>
{
    e.Bounds.Inflate(-5, -5);
    e.Appearance.ForeColor = Color.Teal;
    e.Appearance.TextOptions.HAlignment = HorzAlignment.Center;
    e.Appearance.FontSizeDelta = 3;
    e.DefaultDraw();
    e.Cache.DrawRectangle(e.Cache.GetPen(Color.DarkOliveGreen, 5), e.Bounds);
    e.Handled = true;
};
See Also