如何在页面 itext 7 上制作不同的边距？

Question

For example, on even pages, the indent is 100, on odd indentation - 150. page #1:

doc.setleftMargin(100);

page #2:

doc.setleftMargin(150);

page #3:

doc.setleftMargin(150);

page #4:

doc.setleftMargin(100);

This does not work:

for (int i = 1; i < 5; i++) {
    if (n % 2==0)
        doc.setLeftMargin(100);
    else if(!(n%2==0))
        doc.setLeftMargin(150);

    doc.getPdfDocument().addNewPage();
    doc.add(pLiga);
    System.out.println(doc.getLeftMargin());
    System.out.println(doc.getPdfDocument().getNumberOfPages());

    n++;
    System.out.println(n);
}

pLiga Added 5 times

Answer 1

You are mixing low-level manipulations ( doc.getPdfDocument().addNewPage() ) with high-level ones (eg adding elements to Document ). If you are using high-level API, you should try to stick with it as much as possible. To go to a new page you can use doc.add(new AreaBreak()); . Also be sure to set margins before actually adding any content to a new page.

Rewriting your code into something like following works as expected - margins are alternating from page to page:

int n = 0;
for (int i = 0; i < 5; i++) {
    if (n % 2 == 0) {
        doc.setLeftMargin(100);
    } else {
        doc.setLeftMargin(200);
    }

    // Make sure to set margins before adding elements to new page
    if (i > 0) {
        doc.add(new AreaBreak());
    }
    doc.add(new Paragraph("Hello"));

    n++;
}