TabbedView.CustomDrawTabHeader Event

Allows you to draw a tab header manually.

Namespace: DevExpress.XtraBars.Docking2010.Views.Tabbed

Assembly: DevExpress.XtraBars.v24.1.dll

NuGet Package: DevExpress.Win.Navigation

Declaration

C#

public event TabHeaderCustomDrawEventHandler CustomDrawTabHeader

VB.NET

Public Event CustomDrawTabHeader As TabHeaderCustomDrawEventHandler

Event Data

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

Property	Description
Bounds	Gets the rectangle that specifies the bounds of the tab header.
Cache	Provides access to the drawing surface and a cache of pens, fonts, and brushes.
ControlInfo	Gets an object that contains information about the tab being drawn.
Graphics	Provides access to the drawing surface.
Handled	Gets or sets whether the event is handled and prevents the default draw operation from being performed.
Painter	Provides access to the object that performs paint operations.
TabHeaderInfo	Provides access to the object that contains information about the page being drawn.
TabHeaderRowInfo	Provides access to the object that contains information about the row being drawn.

The event data class exposes the following methods:

Method	Description
DefaultDraw()	Draws the visual element according to the default algorithm.
DefaultDrawBackground()	Draws the visual element’s background according to the default algorithm.
DefaultDrawButtons()	Draws the visual element’s buttons according to the default algorithm.
DefaultDrawImage()	Draws the visual element’s icon according to the default algorithm.
DefaultDrawText()	Draws the visual element’s text according to the default algorithm.
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.
DrawHtml(HtmlTemplate, Action<DxHtmlPainterArgs>)	Paints the required HTML template inside an element that raised this event.

Example

The code below shows how to draw a custom background in tab headers and header buttons.

C#

using System.Drawing.Drawing2D;

HatchBrush myHatchBrush1 = new HatchBrush(HatchStyle.BackwardDiagonal, Color.LightGray, Color.AliceBlue);
private void TabbedView_CustomDrawTabHeader(object sender, XtraTab.TabHeaderCustomDrawEventArgs e) {
    e.Cache.FillRectangle(myHatchBrush1, e.Bounds);
    e.DefaultDrawText();
    e.DefaultDrawImage();
    e.DefaultDrawButtons();
    e.Handled = true;
}
HatchBrush myHatchBrush2 = new HatchBrush(HatchStyle.DiagonalCross, Color.LightGray, Color.AliceBlue);
private void TabbedView_CustomDrawHeaderButton(object sender, XtraTab.HeaderButtonCustomDrawEventArgs e) {
    e.Cache.FillRectangle(myHatchBrush2, e.Bounds);
    e.DefaultDraw();
    e.Handled = true;
}

VB.NET

Imports System.Drawing.Drawing2D

Private myHatchBrush2 As New HatchBrush(HatchStyle.DiagonalCross, Color.LightGray, Color.AliceBlue)
Private Sub TabbedView1_CustomDrawHeaderButton(ByVal sender As Object, ByVal e As DevExpress.XtraTab.HeaderButtonCustomDrawEventArgs) _
    Handles tabbedView1.CustomDrawHeaderButton
    e.Cache.FillRectangle(myHatchBrush2, e.Bounds)
    e.DefaultDraw()
    e.Handled = True
End Sub
Private myHatchBrush1 As New HatchBrush(HatchStyle.BackwardDiagonal, Color.LightGray, Color.AliceBlue)
Private Sub TabbedView1_CustomDrawTabHeader(ByVal sender As Object, ByVal e As DevExpress.XtraTab.TabHeaderCustomDrawEventArgs) _
    Handles tabbedView1.CustomDrawTabHeader
    e.Cache.FillRectangle(myHatchBrush1, e.Bounds)
    e.DefaultDrawText()
    e.DefaultDrawImage()
    e.DefaultDrawButtons()
    e.Handled = True
End Sub

The following example demonstrates how to obtain the bounds of a tab header and its UI elements, and the document itself:

C#

using System.Drawing.Drawing2D;

private void TabbedView1_CustomDrawTabHeader(object sender, DevExpress.XtraTab.TabHeaderCustomDrawEventArgs e) {
    // Gets the document.
    var document = (e.TabHeaderInfo.Page as IDocumentInfo).Document;
    var tabHeaderBounds = e.Bounds;
    var textBounds = e.TabHeaderInfo.Text;
    var buttonBounds = e.TabHeaderInfo.ButtonsPanel.Bounds;
    /*
     * Draw the tab header and its UI elements.
     * ...
     */
}

VB.NET

Imports System.Drawing.Drawing2D

Private Sub TabbedView1_CustomDrawTabHeader(ByVal sender As Object, ByVal e As DevExpress.XtraTab.TabHeaderCustomDrawEventArgs)
    Dim document = (TryCast(e.TabHeaderInfo.Page, IDocumentInfo)).Document
    Dim tabHeaderBounds = e.Bounds
    Dim textBounds = e.TabHeaderInfo.Text
    Dim buttonBounds = e.TabHeaderInfo.ButtonsPanel.Bounds
    ' ...
End Sub