How to set initial view properties?

Tags: open actionviewer preferencespage layoutiText 7

I want to set the properties available under the Initial View tab in Adobe Acrobat for an existing PDF programmatically.

Document Options:

  • Show = Bookmarks Panel and Page
  • Page Layout = Continuous
  • Magnification = Fit Width
  • Open to Page number = 1

Window Options:

  • Show = Document Title

I tried to achieve this using the following code:

PdfStamper stamper =
    new PdfStamper(reader, new FileStream(dPDFFile, FileMode.Create));
stamper.AddViewerPreference(PdfName.DISPLAYDOCTITLE, new PdfBoolean(true));
the above code is used to set the document title show, but the following code is not working:

// For page layout
stamper.AddViewerPreference(PdfName.PAGELAYOUT, new PdfName("OneColumn"));
// For Bookmarks Panel and Page:
stamper.AddViewerPreference(PdfName. PageMode, new PdfName("UseOutlines"));
Finally I also want to set the language to English. The PS Script to do this looks like this [ {Catalog} <</Lang(EN)>> /PUT pdfmark. How is it done in PDF?

Posted on StackOverflow on Jun 23, 2014 by Thirusanguraja Venkatesan

In iText 7 when you have a PdfDocument instance named pdfDoc, you can set the Viewer preferences like this:

pdfDoc.getCatalog().setPageLayout(pageLayoutMode);

In this case, the pageLayoutMode is a value that can have one of the following values:

  • PdfName.SinglePage

  • PdfName.OneColumn

  • PdfName.TwoColumnLeft

  • PdfName.TwoColumnRight

  • PdfName.TwoPageLeft

  • PdfName.TwoPageRight

See the PageLayoutExample for more info.

But in some cases, it's just easier to use:

pdfDoc.getCatalog().setViewerPreferences(viewerPreferences);

Where viewerPreferences is a PdfViewerPreferences object. You can set the required parameters using boolean values or constants from PdfViewerPreferences.PdfViewerPreferencesConstants as is shown in the ViewerPreferencesExample:

PdfDocument pdfDoc = new PdfDocument(new PdfReader(src), new PdfWriter(dest));
PdfViewerPreferences viewerPreferences = pdfDoc.getCatalog().getViewerPreferences();
if (viewerPreferences == null) {
    viewerPreferences = new PdfViewerPreferences();
    pdfDoc.getCatalog().setViewerPreferences(viewerPreferences);
}
viewerPreferences.setDuplex(PdfViewerPreferences.PdfViewerPreferencesConstants.DUPLEX_FLIP_LONG_EDGE);
pdfDoc.close();

As for setting the language, this is done like this:

pdfDoc.getCatalog().put(PdfName.Lang, new PdfString("EN"));

Taken from the additional answer by Chris Haas:

The items Magnification = Fit Width and Open to Page number = 1 are also part of the /Catalog but in a special key called /OpenAction. You can set this using setOpenAction().

In your case you're looking for:

pdfDoc.getCatalog().setOpenAction(PdfExplicitDestination.createXYZ(1, 0, pdfDoc.getPage(1).getPageSize().getHeight(), 0.75f));

Click this link if you want to see how to answer this question in iText 5.