CustomDrawTaskEventArgs.DrawHtml(HtmlTemplate, DxHtmlPainterContext, Action<DxHtmlPainterArgs>) Method

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.

Namespace: DevExpress.XtraGantt

Assembly: DevExpress.XtraGantt.v24.1.dll

NuGet Package: DevExpress.Win.Gantt

Declaration

C#

public void DrawHtml(
    HtmlTemplate template,
    DxHtmlPainterContext context,
    Action<DxHtmlPainterArgs> setupArgs = null
)

VB.NET

Public Sub DrawHtml(
    template As HtmlTemplate,
    context As DxHtmlPainterContext,
    setupArgs As Action(Of DxHtmlPainterArgs) = Nothing
)

Parameters

Name	Type	Description
template	HtmlTemplate	A template to draw.
context	DxHtmlPainterContext	The object that transfers mouse events from a control to a template instance. This allows you to switch visual states (regular, hovered, pressed, and others) of template elements.

Optional Parameters

Name	Type	Default	Description
setupArgs	Action<DxHtmlPainterArgs>	null	Sets up required properties of the DxHtmlPainterArgs object.

Remarks

The DrawHtml method allows you to paint custom HTML templates inside DevExpress controls. For instance, the code below illustrates how to handle the GridView.CustomDrawCell event to paint a template stored in an HtmlTemplateCollection inside cells that belong to the “Name” column.

C#

void OnCustomDrawCell(object sender, RowCellCustomDrawEventArgs e) {
    e.DefaultDraw();
    e.Handled = true;
    if (e.Column.FieldName == "Name")
        e.DrawHtml(htmlTemplateCollection1[0]);
}

VB.NET

Private Sub OnCustomDrawCell(ByVal sender As Object, ByVal e As RowCellCustomDrawEventArgs)
    e.DefaultDraw()
    e.Handled = True
    If e.Column.FieldName = "Name" Then e.DrawHtml(htmlTemplateCollection1(0))
End Sub

The optional setupArgs delegate allows you to set up additional settings: specify interactivity keys, modify drawing bounds, assign custom values to elements with ${FieldName} placeholders, and more.

The following example demonstrates how to clip the content based on the container bounds:

C#

void OnCustomDrawCell(object sender, RowCellCustomDrawEventArgs e) {
    var clipInfo = e.Cache.SaveAndSetClip(e.Bounds);
    try {
        e.DrawHtml(templates[0]);
    } finally {
        e.Cache.ClipInfo.RestoreClipRelease(clipInfo);
    }
}

VB.NET

Private Sub OnCustomDrawCell(ByVal sender As Object, ByVal e As RowCellCustomDrawEventArgs)
    Dim clipInfo = e.Cache.SaveAndSetClip(e.Bounds)
    Try
        e.DrawHtml(templates(0))
    Finally
        e.Cache.ClipInfo.RestoreClipRelease(clipInfo)
    End Try
End Sub

Read the following topic for more information and examples: Custom Draw Templates.