SchedulerControl.CustomDrawDayHeader Event

Enables day headers to be painted manually.

Namespace: DevExpress.XtraScheduler

Assembly: DevExpress.XtraScheduler.v23.2.dll

NuGet Package: DevExpress.Win.Scheduler

Declaration

C#

public event CustomDrawObjectEventHandler CustomDrawDayHeader

VB.NET

Public Event CustomDrawDayHeader As CustomDrawObjectEventHandler

Event Data

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

Property	Description
Bounds	Returns the bounding rectangle of the drawing area.
Cache	Gets an object which specifies the storage for the pens, fonts and brushes. Use it for custom painting in Scheduler Reports.
Graphics	Gets an object used for painting.
Handled	Gets or sets whether an event was handled. If it was handled, the default actions are not required.
ObjectInfo	Gets information on the painted element.

The event data class exposes the following methods:

Method	Description
DrawDefault()	Renders the element using the default drawing mechanism.
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.
GetDisplayValue(String)
GetValue(String)

Remarks

The CustomDrawDayHeader event is raised before a day header is painted. The event parameter’s CustomDrawObjectEventArgs.ObjectInfo property provides all the information necessary to paint a day header. The return value of this property should be typecast to the DayHeader type.

Set the CustomDrawObjectEventArgs.Handled property to true to prohibit default header painting.

You can paint object in a default manner before custom drawing. Use the CustomDrawObjectEventArgs.DrawDefault method for default drawing within event handler.

Example

This example uses the code that paints day headers with blue gradient color, as illustrated in the image below.

CustomDraw.cs

public static void scheduler_CustomDrawDayHeader(object sender, CustomDrawObjectEventArgs e)
{
    DayHeader header = e.ObjectInfo as DayHeader;
    // Draws the outer rectangle.
    using(var backBrush = new LinearGradientBrush(e.Bounds,
            Color.LightBlue, Color.Blue, LinearGradientMode.Vertical))
        e.Cache.FillRectangle(backBrush, e.Bounds);
    Rectangle innerRect = Rectangle.Inflate(e.Bounds, -2, -2);
    // Draws the inner rectangle.
    using(var backBrush = new LinearGradientBrush(e.Bounds,
            Color.Blue, Color.LightSkyBlue, LinearGradientMode.Vertical))
        e.Cache.FillRectangle(backBrush, innerRect);
    // Draws the header's caption.
    e.Cache.DrawString(header.Caption, header.Appearance.HeaderCaption.Font,
        Brushes.White, innerRect,
        header.Appearance.HeaderCaption.GetStringFormat());
    e.Handled = true;
}

CustomDraw.vb

Public Shared Sub scheduler_CustomDrawDayHeader(ByVal sender As Object, ByVal e As CustomDrawObjectEventArgs)
    Dim header As DayHeader = TryCast(e.ObjectInfo, DayHeader)
    ' Draws the outer rectangle.
    Using backBrush = New LinearGradientBrush(e.Bounds, Color.LightBlue, Color.Blue, LinearGradientMode.Vertical)
        e.Cache.FillRectangle(backBrush, e.Bounds)
    End Using
    Dim innerRect As Rectangle = Rectangle.Inflate(e.Bounds, -2, -2)
    ' Draws the inner rectangle.
    Using backBrush = New LinearGradientBrush(e.Bounds, Color.Blue, Color.LightSkyBlue, LinearGradientMode.Vertical)
        e.Cache.FillRectangle(backBrush, innerRect)
    End Using
    ' Draws the header's caption.
    e.Cache.DrawString(header.Caption, header.Appearance.HeaderCaption.Font, Brushes.White, innerRect, header.Appearance.HeaderCaption.GetStringFormat())
    e.Handled = True
End Sub