Working with Hyperlinks

31 Mar 2020 / 2 minutes to read

In PDF, hyperlinks can be added to allow the users to navigate to another part of a PDF file and web page.

Working with Web navigation

You can navigate to a specified URL from a PDF document by using the PdfTextWebLink class.

Refer to the following code snippet for navigating to the webpage.

dart

//Create a new Pdf document
PdfDocument document = PdfDocument();

//Create and draw the web link in the PDF page
PdfTextWebLink(
        url: 'www.google.co.in',
        text: 'google',
        font: PdfStandardFont(PdfFontFamily.timesRoman, 14),
        brush: PdfSolidBrush(PdfColor(0, 0, 0)),
        pen: PdfPens.brown,
        format: PdfStringFormat(
            alignment: PdfTextAlignment.center,
            lineAlignment: PdfVerticalAlignment.middle))
    .draw(document.pages.add(), Offset(50, 40));

//Save the PDF document
File('Hyperlink.pdf').writeAsBytes(document.save());

//Dispose document
document.dispose();

Working with internal document navigation

To allow the users navigate to any other part of the same document, the PdfDocumentLinkAnnotation class can be used.

The following code explains how to add the hyperlink for internal document navigation.

dart

//Create a new Pdf document
PdfDocument document = PdfDocument();

//Create a page
PdfPage page = document.pages.add();

//Create a document link
PdfDocumentLinkAnnotation docLink = PdfDocumentLinkAnnotation(
    Rect.fromLTWH(10, 40, 30, 30),
    PdfDestination(document.pages.add(), Offset(10, 0)));

//Set the destination mode
docLink.destination.mode = PdfDestinationMode.fitToPage;

//Add the document link to the page
page.annotations.add(docLink);

//Save the PDF document
File('Hyperlink.pdf').writeAsBytes(document.save());

//Dispose document
document.dispose();