itextpdf different margin on specific page

Question

Good day everyone!

I have some questions regarding document:

Does itextpdf have the option to have a different margin on a specific page? I have tried to use

document.setMargin

then

document.newPage

but it seems that every page get the same margin.

Is there any way to prevent header and element from overlapping?

Thanks!

EDIT

Here is the method that adds the document content:

    @Override
    void addDocumentContent(Document doc, PdfWriter writer, AbstractDiplomaDataModel diplomaData) throws DiplomaPdfFileProducerException {
        try {
            doc.setMargins(DefaultPdfDocumentSettings.LEFT_MARGIN, DefaultPdfDocumentSettings.RIGHT_MARGIN, 0f, 0f);
            doc.newPage();          
            doc.add(new DiplomaPdfDataGenerator(diplomaData).generateFirstPagePdf());
            doc.setMargins(DefaultPdfDocumentSettings.LEFT_MARGIN, DefaultPdfDocumentSettings.RIGHT_MARGIN, DefaultPdfDocumentSettings.TOP_MARGIN,DefaultPdfDocumentSettings.BOTTOM_MARGIN);
            doc.newPage();          
            doc.add(new DiplomaPdfDataGenerator(diplomaData).generateOtherPagesPdf());
        } catch (Exception e) {
            throw new DiplomaPdfFileProducerException(e.getMessage());
        }
    }

and this is the result:

What do `DiplomaPdfDataGenerator.generateFirstPagePdf()` and `DiplomaPdfDataGenerator.generateOtherPagesPdf()` return? And how do you generate your headers? And what are the values of those `DefaultPdfDocumentSettings` constants? Other than that the code looks like the code in my answer which does work like expected. Thus, something is special about those objects or mechanics. — mkl, Jun 28 '16 at 12:58
It worked. The generateFirstPagePdf() and generateOtherPagesPdf() return Paragraph/Element. I just didn't notice the difference because DefaultPdfDocumentSettings.TOP_MARGIN is 20. I changed the top margin to 60 and I noticed the difference — triForce420, Jun 29 '16 at 06:49
Great! I was starting to wonder what those methods could return to make the result ignore the margins... ;) — mkl, Jun 29 '16 at 07:19

mkl · Accepted Answer · 2016-06-28T08:52:45.307

I just tried what you described:

StringBuilder builder = new StringBuilder("test");
for (int i = 0; i < 100; i++)
    builder.append(" test");
String test = builder.toString();

try (   OutputStream pdfStream = new FileOutputStream(new File(RESULT_FOLDER, "ChangingMargins.pdf")))
{
    Document pdfDocument = new Document(PageSize.A4.rotate(), 0, 0, 0, 0);
    PdfWriter.getInstance(pdfDocument, pdfStream);
    pdfDocument.open();

    for (int m = 0; m < pdfDocument.getPageSize().getWidth() / 2; m += 100)
    {
        pdfDocument.setMargins(m, m, 100, 100);
        pdfDocument.newPage();
        pdfDocument.add(new Paragraph(test));
    }

    pdfDocument.close();
}

(ChangeMargins.java method testChangingMargins)

The result:

Thus, considering your item 1: Yes, iText can have a different margin on a specific page.

The OP wondered in a comment:

how about top and bottom margin? :/

For this I changed the loop above to:

    for (int m = 0; m < pdfDocument.getPageSize().getWidth() / 2 && m < pdfDocument.getPageSize().getHeight() / 2; m += 100)
    {
        pdfDocument.setMargins(m, m, m, m);
        pdfDocument.newPage();
        pdfDocument.add(new Paragraph(test));
    }

And the result:

Thus, different top and bottom margins work, too.

Considering your issue 2 whether there any way to prevent header and element from overlapping: Usually they do not overlap.

Cf. my edit, after the obvious change vertical margins change, too. — mkl, Jun 28 '16 at 08:53
I edited my post to add some line of code and screenshot of what happens after adding content — triForce420, Jun 28 '16 at 09:17
I have a similar Problem, but I am adding just one Paragraph spanning multiple pages, that has to have a different top margin only on page 1, can one achieve that aswell? — nuuse, Dec 06 '18 at 13:50

itextpdf different margin on specific page

1 Answers1

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