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Unplanned
Last Updated: 27 Mar 2026 08:45 by ADMIN
Greg
Created on: 27 Mar 2026 08:34
Category: PDFViewer
Type: Bug Report
0
PDF Viewer: Transparency in text fragment is not respected

when having a document with a text fragment with a transparency, the transparency is not respected. the full color is displayed.

1 comment
ADMIN
Didi
Posted on: 27 Mar 2026 08:45

Workaround:

1.     Subscribe to the PdfViewer.PageElementsLoaded event.

2. Enumerate the page's content elements.
3. Find TextFragment objects whose text matches "Watermak text!".
4.     Set the fill color to the fragment with transparency

    <telerik:RadPdfViewer x:Name="pdfViewer"
                          PageElementsLoaded="pdfViewer_PageElementsLoaded"/>

and the page element loaded event with the workaround implemented.

private void pdfViewer_PageElementsLoaded(object sender, Telerik.Maui.Controls.PdfViewer.PageElementsLoadedEventArgs e)
{
    UpdateWatermarkTransparency(e.Page);
}

private static void UpdateWatermarkTransparency(RadFixedPage fixedPage)
{
    foreach (var contentElement in fixedPage.Content)
    {
        if (contentElement is Telerik.Windows.Documents.Fixed.Model.Text.TextFragment textBlock)
        {
            if(textBlock.Text.Contains("Watermark text!"))
            {
                textBlock.Fill = new RgbColor(60, 255, 0, 0);
            }
        }
    }
}

Regards,
Didi
Progress Telerik

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