CardView.CustomDrawCardFieldCaption Event

Enables you to custom paint card field captions.

Namespace: DevExpress.XtraGrid.Views.Card

Assembly: DevExpress.XtraGrid.v23.2.dll

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

Declaration

C#

[DXCategory("CustomDraw")]
public event RowCellCustomDrawEventHandler CustomDrawCardFieldCaption

VB.NET

<DXCategory("CustomDraw")>
Public Event CustomDrawCardFieldCaption As RowCellCustomDrawEventHandler

Event Data

The CustomDrawCardFieldCaption event's data class is RowCellCustomDrawEventArgs. 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.
Cell	Provides information on the painted cell.
CellValue	Gets the painted value or display text (depending on the event).
Column	Gets the column whose element is being painted.
DisplayText	Gets or sets the painted element’s display text.
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.
RowHandle	Gets the handle of a painted element’s row.

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 CustomDrawCardFieldCaption event fires each time a card field caption needs to be repainted. The event enables you to paint such elements manually or to modify your element’s settings before it is painted in the default manner. See the Custom Painting Basics and Custom Painting Scenarios topics for information on using custom draw events.

Note

The CustomDrawCardFieldCaption event is not raised if you handle the CardView.CustomDrawCardField event and set its CustomDrawEventArgs.Handled parameter to true.

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 example shows how to use the CardView.CustomDrawCardFieldCaption event to custom paint card field captions. Field captions are drawn differently for focused and non-focused fields.

C#

private void cardView1_CustomDrawCardFieldCaption(object sender, Views.Base.RowCellCustomDrawEventArgs e) {
    CardView cv = sender as CardView;
    bool isFocusedFieldAndCard = false;
    if (cv.FocusedColumn != null)
        isFocusedFieldAndCard = e.Column.AbsoluteIndex == cv.FocusedColumn.AbsoluteIndex &&
          e.RowHandle == cv.FocusedRowHandle;
    //The brush to draw the background of card field captions
    Brush backBrush;
    Color color1 = Color.FromArgb(240, 240, 240);
    Color color2 = Color.FromArgb(166, 166, 166);
    if (isFocusedFieldAndCard)
        backBrush = e.Cache.GetGradientBrush(e.Bounds, color1, color2, LinearGradientMode.Horizontal); 
    else
        backBrush = e.Cache.GetGradientBrush(e.Bounds, color2, color1, LinearGradientMode.Horizontal);
    e.Cache.FillRectangle(backBrush, e.Bounds);
    e.Appearance.DrawString(e.Cache, e.DisplayText, e.Bounds);
    //Prevent default painting
    e.Handled = true;
}

VB.NET

Private Sub CardView1_CustomDrawCardFieldCaption(sender As Object, e As DevExpress.XtraGrid.Views.Base.RowCellCustomDrawEventArgs) Handles CardView1.CustomDrawCardFieldCaption
    Dim cv As CardView = TryCast(sender, CardView)
    Dim isFocusedFieldAndCard As Boolean = False
    If cv.FocusedColumn IsNot Nothing Then
        isFocusedFieldAndCard = e.Column.AbsoluteIndex = cv.FocusedColumn.AbsoluteIndex AndAlso e.RowHandle = cv.FocusedRowHandle
    End If
    Dim backBrush As Brush
    Dim color1 As Color = Color.FromArgb(240, 240, 240)
    Dim color2 As Color = Color.FromArgb(166, 166, 166)
    If isFocusedFieldAndCard Then backBrush = e.Cache.GetGradientBrush(e.Bounds, color1, color2, LinearGradientMode.Horizontal) Else backBrush = e.Cache.GetGradientBrush(e.Bounds, color2, color1, LinearGradientMode.Horizontal)
    e.Cache.FillRectangle(backBrush, e.Bounds)
    e.Appearance.DrawString(e.Cache, e.DisplayText, e.Bounds)
    e.Handled = True
End Sub