VGridControlBase.CustomDrawSeparator Event

Enables cell separators to be painted manually.

Namespace: DevExpress.XtraVerticalGrid

Assembly: DevExpress.XtraVerticalGrid.v19.2.dll

Declaration

C#

public event CustomDrawSeparatorEventHandler CustomDrawSeparator

VB.NET

Public Event CustomDrawSeparator As CustomDrawSeparatorEventHandler

Event Data

The CustomDrawSeparator event's data class is CustomDrawSeparatorEventArgs. 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.
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.
IsHeaderSeparator	Gets a value indicating whether the painted cell separator is contained within the row header.
IsRightToLeft	Gets a value indicating whether the VGridControl‘s elements are aligned to support locales using right-to-left fonts. Inherited from CustomDrawEventArgs.
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.
Row	Gets the painted cell separator’s owning row.
SeparatorIndex	Gets the painted cell separator’s index.
SeparatorKind	Gets the painted cell separator’s type.
SeparatorString	Gets or sets the painted cell separator’s text.

The event data class exposes the following methods:

Method	Description
DefaultDraw()	Performs default painting of an element. Inherited from CustomDrawEventArgs.

Remarks

The CustomDrawSeparator event is raised before a cell separator is painted. The cell separator is identified by the CustomDrawSeparatorEventArgs.Row and CustomDrawSeparatorEventArgs.SeparatorIndex properties. Its type can be obtained using the CustomDrawSeparatorEventArgs.SeparatorKind property. The event parameter’s CustomDrawSeparatorEventArgs.IsHeaderSeparator property allows you to identify whether the processed separator is contained within the row header.

The CustomDrawSeparator event can be used for two purposes:

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

Important

Never change cell values or modify the control’s layout on this event, or any other event designed to tune the control’s appearance. Any action that causes a layout update 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, new SolidBrush(Color.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, new SolidBrush(Color.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, new SolidBrush(Color.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, New SolidBrush(Color.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, New SolidBrush(Color.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, New SolidBrush(Color.DarkBlue), e.Bounds, e.Appearance.GetStringFormat())
    e.Handled = True
End Sub