Inserting HTML Content into PDF TableCell with RadPdfProcessing
Environment
| Version | Product | Author |
|---|---|---|
| 2024.4.1106.NET Standard | RadWordsProcessing-RadPdfProcessing | Desislava Yordanova |
Description
When you generate PDF documents, a common requirement is to insert HTML content into specific sections of the document, such as a TableCell. This article demonstrates how to achieve this through the integration between RadPdfProcessing and RadWordsProcessing libraries.
Sample HTML content to Insert
<!DOCTYPE html>
<html>
<body>
<p>I am normal</p>
<p style="color:red;">I am red</p>
<p style="color:blue;">I am blue</p>
<p style="font-size:50px;">I am big</p>
</body>
</html>
Solution
To insert HTML content into a TableCell in a PDF document, obtain the HTML content as an image and insert the image inside the PDF table cell. The following steps and code snippet demonstrate this approach:
-
Import HTML Content: Use the
HtmlFormatProviderfrom RadWordsProcessing to import the HTML content into a RadFlowDocument. -
Export the HTML Content to PDF Format: Use the
PdfFormatProviderfrom RadWordsProcessing to convert theRadFlowDocumentinto PDF format. -
Convert the Exported PDF Content to an Image: Use the
PdfFormatProviderfrom RadPdfProcessing to import the PDF-converted HTML content to a RadFixedDocument. Then use the SkiaImageFormatProvider to export the PDF pages to images. -
Insert the Exported Images into the PDF TableCell: Use the FixedContentEditor from RadPdfProcessing to create the main PDF document with a table and insert the converted PDF images into the desired TableCell.
Inserting HTML Content as PDF
Telerik.Documents.ImageUtils.ImagePropertiesResolver defaultImagePropertiesResolver = new Telerik.Documents.ImageUtils.ImagePropertiesResolver();
Telerik.Windows.Documents.Extensibility.FixedExtensibilityManager.ImagePropertiesResolver = defaultImagePropertiesResolver;
RadFixedDocument mainPdfDocument = new RadFixedDocument();
RadFixedPage page = mainPdfDocument.Pages.AddPage();
FixedContentEditor editor = new FixedContentEditor(page);
Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider fixedPdfFormatProvider = new Telerik.Windows.Documents.Fixed.FormatProviders.Pdf.PdfFormatProvider();
//Create PDF table
Telerik.Windows.Documents.Fixed.Model.Editing.Tables.Table table = new Telerik.Windows.Documents.Fixed.Model.Editing.Tables.Table();
//Set borders
Telerik.Windows.Documents.Fixed.Model.Editing.Border border = new Telerik.Windows.Documents.Fixed.Model.Editing.Border();
table.Borders = new Telerik.Windows.Documents.Fixed.Model.Editing.TableBorders(border);
table.DefaultCellProperties.Borders = new Telerik.Windows.Documents.Fixed.Model.Editing.Tables.TableCellBorders(border, border, border, border);
//Set table properties
table.Margin = new Thickness(20);
table.DefaultCellProperties.Padding = new Thickness(5);
table.BorderSpacing = 2;
//Create row
Telerik.Windows.Documents.Fixed.Model.Editing.Tables.TableRow row1 = table.Rows.AddTableRow();
Telerik.Windows.Documents.Fixed.Model.Editing.Tables.TableCell imgCell = row1.Cells.AddTableCell();
imgCell.PreferredWidth = 200;
string htmlContent = File.ReadAllText("cellContent.html");
//Import HTML as RadFlowDocument
HtmlFormatProvider htmlFormatProvider = new HtmlFormatProvider();
RadFlowDocument htmlDocument = htmlFormatProvider.Import(htmlContent, TimeSpan.FromSeconds(10));
//Export HTML to PDF
Telerik.Windows.Documents.Flow.FormatProviders.Pdf.PdfFormatProvider flowPdfFormatProvider = new Telerik.Windows.Documents.Flow.FormatProviders.Pdf.PdfFormatProvider();
byte[] htmlToPdfByteArray = flowPdfFormatProvider.Export(htmlDocument, TimeSpan.FromSeconds(10));
//Import htmlToPdfByteArray as RadFixedDocument
RadFixedDocument htmlPdfDocument = fixedPdfFormatProvider.Import(htmlToPdfByteArray, TimeSpan.FromSeconds(10));
RgbColor bordersColor = new RgbColor(255, 0, 0);
Telerik.Windows.Documents.Fixed.Model.Editing.Border cellBorder = new Telerik.Windows.Documents.Fixed.Model.Editing.Border(2, Telerik.Windows.Documents.Fixed.Model.Editing.BorderStyle.Single, bordersColor);
Telerik.Windows.Documents.Fixed.Model.Editing.Tables.TableCellBorders tableCellsBorder = new Telerik.Windows.Documents.Fixed.Model.Editing.Tables.TableCellBorders(border, border, border, border, null, null);
//Export the PDF pages as images
Telerik.Documents.Fixed.FormatProviders.Image.Skia.SkiaImageFormatProvider imageProvider = new Telerik.Documents.Fixed.FormatProviders.Image.Skia.SkiaImageFormatProvider();
string imagesFolderPath = @"..\..\..\Images\";
int count = 1;
foreach (RadFixedPage p in htmlPdfDocument.Pages)
{
byte[] resultImage = imageProvider.Export(p, TimeSpan.FromSeconds(10));
File.WriteAllBytes(imagesFolderPath + count++ + ".png", resultImage);
}
Block imageBlock;
string[] pdfFilePaths = Directory.GetFiles(imagesFolderPath);
foreach (string imageFilePath in pdfFilePaths)
{
imageBlock = imgCell.Blocks.AddBlock();
imageBlock.HorizontalAlignment = Telerik.Windows.Documents.Fixed.Model.Editing.Flow.HorizontalAlignment.Center;
imageBlock.InsertImage(new FileStream(imageFilePath, FileMode.Open),new Size(300,400));
imgCell = row1.Cells.AddTableCell();
imgCell.Borders = tableCellsBorder;
}
//Draw the generated table
editor.DrawTable(table);
string outputFile = "output.pdf";
File.Delete(outputFile);
//Export main PDF with changes
using (Stream output = File.OpenWrite(outputFile))
{
fixedPdfFormatProvider.Export(mainPdfDocument, output, TimeSpan.FromSeconds(10));
}
//Open main PDF
var psi = new ProcessStartInfo()
{
FileName = outputFile,
UseShellExecute = true
};
Process.Start(psi);