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Repeating parts of a form

AddExtraTable.java
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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/28590487/adding-table-to-existing-pdf-on-the-same-page-itext
 */
package com.itextpdf.samples.sandbox.acroforms;
 
import com.itextpdf.forms.PdfAcroForm;
import com.itextpdf.forms.fields.PdfFormField;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Table;
import com.itextpdf.layout.layout.LayoutArea;
import com.itextpdf.layout.layout.LayoutResult;
import com.itextpdf.layout.property.UnitValue;
import com.itextpdf.layout.renderer.DocumentRenderer;
import com.itextpdf.layout.renderer.IRenderer;
 
import java.io.File;
import java.util.Map;
 
public class AddExtraTable {
    public static String DEST = "./target/sandbox/acroforms/add_extra_table.pdf";
 
    public static String SRC = "./src/test/resources/pdfs/form.pdf";
 
    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
 
        new AddExtraTable().manipulatePdf(DEST);
    }
 
    protected void manipulatePdf(String dest) throws Exception {
        PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest));
        Document doc = new Document(pdfDoc);
 
        PdfAcroForm form = PdfAcroForm.getAcroForm(pdfDoc, true);
        Map<String, PdfFormField> fields = form.getFormFields();
        fields.get("Name").setValue("Jeniffer");
        fields.get("Company").setValue("iText's next customer");
        fields.get("Country").setValue("No Man's Land");
        form.flattenFields();
 
        Table table = new Table(UnitValue.createPercentArray(new float[] {1, 15}));
        table.setWidth(UnitValue.createPercentValue(80));
        table.addHeaderCell("#");
        table.addHeaderCell("description");
        for (int i = 1; i <= 150; i++) {
            table.addCell(String.valueOf(i));
            table.addCell("test " + i);
        }
 
        // The custom renderer decreases the first page's area.
        // As a result, there is not overlapping between the table from acroform and the new one.
        doc.setRenderer(new ExtraTableRenderer(doc));
        doc.add(table);
 
        doc.close();
    }
 
    protected static class ExtraTableRenderer extends DocumentRenderer {
 
        public ExtraTableRenderer(Document document) {
            super(document);
        }
 
        // If renderer overflows on the next area, iText uses getNextRender() method to create a renderer for the overflow part.
        // If getNextRenderer isn't overriden, the default method will be used and thus a default rather than custom
        // renderer will be created
        @Override
        public IRenderer getNextRenderer() {
            return new ExtraTableRenderer(document);
        }
 
        @Override
        protected LayoutArea updateCurrentArea(LayoutResult overflowResult) {
            LayoutArea area = super.updateCurrentArea(overflowResult);
            if (area.getPageNumber() == 1) {
                area.getBBox().decreaseHeight(266);
            }
 
            return area;
        }
 
    }
}

Click the following link to see the legacy example for iText 5. Except for security fixes, iText 5 is no longer being developed.



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