SpreadsheetControl.CustomDrawColumnHeader Event

Enables the column header to be painted manually.

Namespace: DevExpress.XtraSpreadsheet

Assembly: DevExpress.XtraSpreadsheet.v21.2.dll

Declaration

public event CustomDrawColumnHeaderEventHandler CustomDrawColumnHeader

Event Data

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

Property Description
Appearance Provides access to the properties that control the appearance of a worksheet header. Inherited from CustomDrawHeaderEventArgsBase.
BackColor Gets the background color of the header. Inherited from CustomDrawHeaderEventArgsBase.
Bounds Gets the header’s bound rectangle. Inherited from CustomDrawHeaderEventArgsBase.
Cache Gets an object that serves as the storage for pens, fonts and brushes. Inherited from CustomDrawObjectEventsArgs.
ColumnIndex Returns the column index of the column header being painted.
Control Provides access to the SpreadsheetControl that raised the event. Inherited from CustomDrawHeaderEventArgsBase.
Font Gets the font used to paint the header caption. Inherited from CustomDrawHeaderEventArgsBase.
ForeColor Gets the color used to paint the header caption text. Inherited from CustomDrawHeaderEventArgsBase.
Graphics Gets an object used for painting. Inherited from CustomDrawObjectEventsArgs.
Handled Gets or sets whether an event is handled. If true, the default actions are not required. Inherited from CustomDrawObjectEventsArgs.
IsHovered Gets whether a mouse is currently over the worksheet header. Inherited from CustomDrawHeaderEventArgsBase.
IsSelected Gets whether the current column contains selected cell(s). Inherited from CustomDrawHeaderEventArgsBase.
Text Gets the text of the header caption. Inherited from CustomDrawHeaderEventArgsBase.

The event data class exposes the following methods:

Method Description
DrawDefault() Renders the element using the default drawing mechanism. Inherited from CustomDrawObjectEventsArgs.

Remarks

The CustomDrawColumnHeader event is raised before a column header is painted. Event arguments properties provide the objects and information required to paint the column header.

Set the CustomDrawObjectEventsArgs.Handled property to true to cancel default painting. Use the CustomDrawObjectEventsArgs.DrawDefault method to perform default painting within the event handler.

The code snippet below handles the SpreadsheetControl.CustomDrawColumnHeader event to change default text (A, B, C, …) in column headers. This example does not change the background color of column headers. Refer to the following topic for information on how to apply a custom color to column headers: SpreadsheetControl.CustomDrawColumnHeaderBackground.

Handle the CustomDrawColumnHeader event

View Example: Use Custom Draw Events to Customize the Appearance of Spreadsheet Elements

using System;
using System.Drawing;
using DevExpress.Spreadsheet;
using DevExpress.XtraSpreadsheet;
// ...
private void spreadsheetControl1_CustomDrawColumnHeader(object sender, 
    CustomDrawColumnHeaderEventArgs e)
{           
    // Cancel default painting for the column header.
    e.Handled = true;

    if (e.ColumnIndex > 4) 
        return;

    // Specify the list of new column header names.
    string[] headers = new string[] { "Category", "Product Name", 
        "Quantity per Unit", "Unit Price", "Units in Stock" };

    // Specify font attributes for the column header.
    SpreadsheetFont defaultFont = spreadsheetControl1.Document.Styles.DefaultStyle.Font;
    using (Font font = new Font(defaultFont.Name, (float)defaultFont.Size, FontStyle.Bold))
    {
        // Specify layout settings for the column header.
        using (StringFormat stringFormat = new StringFormat())
        {
            stringFormat.LineAlignment = StringAlignment.Center;
            stringFormat.Alignment = e.ColumnIndex < 3 ? StringAlignment.Near : StringAlignment.Far;
            stringFormat.Trimming = StringTrimming.EllipsisCharacter;

            // Draw the column header.
            e.Graphics.DrawString(headers[e.ColumnIndex], font, 
                e.Cache.GetSolidBrush(Color.White), e.Bounds, stringFormat);
        }
    }
}
See Also