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Page events for Chunks

These examples were written in answer to questions such as:


dashedunderline

JAVA

JAVA 
/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 Apryse Group NV
    Authors: Apryse Software.

    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
package com.itextpdf.samples.sandbox.events;

import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Text;
import com.itextpdf.layout.renderer.DrawContext;
import com.itextpdf.layout.renderer.IRenderer;
import com.itextpdf.layout.renderer.TextRenderer;

import java.io.File;

public class DashedUnderline {
    public static final String DEST = "./target/sandbox/events/dashed_underline.pdf";

    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();

        new DashedUnderline().manipulatePdf(DEST);
    }

    protected void manipulatePdf(String dest) throws Exception {
        PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
        Document doc = new Document(pdfDoc);

        doc.add(new Paragraph("This text is not underlined"));

        Text text1 = new Text("This text is underlined with a solid line");
        text1.setUnderline(1, -3);
        doc.add(new Paragraph(text1));

        Text text2 = new Text("This text is underlined with a dashed line");
        text2.setNextRenderer(new DashedLineTextRenderer(text2));
        doc.add(new Paragraph(text2));

        doc.close();
    }

    private static class DashedLineTextRenderer extends TextRenderer {

        public DashedLineTextRenderer(Text textElement) {
            super(textElement);
        }

        // If a renderer overflows on the next area, iText uses #getNextRenderer() method to create a new renderer for the overflow part.
        // If #getNextRenderer() isn't overridden, the default method will be used and thus the default rather than the custom
        // renderer will be created
        @Override
        public IRenderer getNextRenderer() {
            return new DashedLineTextRenderer((Text) modelElement);
        }

        @Override
        public void draw(DrawContext drawContext) {
            super.draw(drawContext);
            Rectangle rect = this.getOccupiedAreaBBox();
            PdfCanvas canvas = drawContext.getCanvas();
            canvas
                    .saveState()
                    .setLineDash(3, 3)
                    .moveTo(rect.getLeft(), rect.getBottom() - 3)
                    .lineTo(rect.getRight(), rect.getBottom() - 3)
                    .stroke()
                    .restoreState();
        }
    }
}

C#

C# 
using System;
using System.IO;
using iText.Kernel.Geom;
using iText.Kernel.Pdf;
using iText.Kernel.Pdf.Canvas;
using iText.Layout;
using iText.Layout.Element;
using iText.Layout.Renderer;

namespace iText.Samples.Sandbox.Events
{
    public class DashedUnderline
    {
        public static readonly String DEST = "results/sandbox/events/dashed_underline.pdf";

        public static void Main(String[] args)
        {
            FileInfo file = new FileInfo(DEST);
            file.Directory.Create();

            new DashedUnderline().ManipulatePdf(DEST);
        }

        protected void ManipulatePdf(String dest)
        {
            PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
            Document doc = new Document(pdfDoc);

            doc.Add(new Paragraph("This text is not underlined"));

            Text text1 = new Text("This text is underlined with a solid line");
            text1.SetUnderline(1, -3);
            doc.Add(new Paragraph(text1));

            Text text2 = new Text("This text is underlined with a dashed line");
            text2.SetNextRenderer(new DashedLineTextRenderer(text2));
            doc.Add(new Paragraph(text2));

            doc.Close();
        }

        private class DashedLineTextRenderer : TextRenderer
        {
            public DashedLineTextRenderer(Text textElement) : base(textElement)
            {
            }

            // 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
            public override IRenderer GetNextRenderer()
            {
                return new DashedLineTextRenderer((Text) modelElement);
            }

            public override void Draw(DrawContext drawContext)
            {
                base.Draw(drawContext);
                Rectangle rect = this.GetOccupiedAreaBBox();
                PdfCanvas canvas = drawContext.GetCanvas();
                canvas
                    .SaveState()
                    .SetLineDash(3, 3)
                    .MoveTo(rect.GetLeft(), rect.GetBottom() - 3)
                    .LineTo(rect.GetRight(), rect.GetBottom() - 3)
                    .Stroke()
                    .RestoreState();
            }
        }
    }
}


every25words

JAVA

JAVA 
/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 Apryse Group NV
    Authors: Apryse Software.

    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
package com.itextpdf.samples.sandbox.events;

import com.itextpdf.kernel.geom.PageSize;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Text;
import com.itextpdf.layout.renderer.DrawContext;
import com.itextpdf.layout.renderer.IRenderer;
import com.itextpdf.layout.renderer.TextRenderer;

import java.io.*;

public class Every25Words {
    public static final String DEST = "./target/sandbox/events/every25words.pdf";

    public static final String SRC = "./src/main/resources/txt/liber1_1_la.txt";

    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();

        new Every25Words().manipulatePdf(DEST);
    }

    protected void manipulatePdf(String dest) throws Exception {
        PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
        Document doc = new Document(pdfDoc);

        String[] words = readFile(SRC).split("\\s+");
        Paragraph paragraph = new Paragraph();
        Text text = null;
        int i = 0;
        for (String word : words) {
            if (text != null) {
                paragraph.add(" ");
            }

            text = new Text(word);
            text.setNextRenderer(new Word25TextRenderer(text, ++i));
            paragraph.add(text);
        }

        doc.add(paragraph);

        doc.close();
    }

    private static String readFile(String filePath) throws IOException {
        StringBuilder sb = new StringBuilder();

        try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath), "UTF8"))) {
            String str;
            while ((str = reader.readLine()) != null) {
                sb.append(str);
            }
        }

        return sb.toString();
    }


    private static class Word25TextRenderer extends TextRenderer {
        private int count = 0;

        public Word25TextRenderer(Text textElement, int count) {
            super(textElement);
            this.count = count;
        }

        // If a renderer overflows on the next area, iText uses #getNextRenderer() method to create a new renderer for the overflow part.
        // If #getNextRenderer() isn't overridden, the default method will be used and thus the default rather than the custom
        // renderer will be created
        @Override
        public IRenderer getNextRenderer() {
            return new Word25TextRenderer((Text) modelElement, count);
        }

        @Override
        public void draw(DrawContext drawContext) {
            super.draw(drawContext);

            // Draws a line to delimit the text every 25 words
            if (0 == count % 25) {
                Rectangle textRect = getOccupiedAreaBBox();
                int pageNumber = getOccupiedArea().getPageNumber();
                PdfCanvas canvas = drawContext.getCanvas();
                Rectangle pageRect = drawContext.getDocument().getPage(pageNumber).getPageSize();
                canvas
                        .saveState()
                        .setLineDash(5, 5)
                        .moveTo(pageRect.getLeft(), textRect.getBottom())
                        .lineTo(textRect.getRight(), textRect.getBottom())
                        .lineTo(textRect.getRight(), textRect.getTop())
                        .lineTo(pageRect.getRight(), textRect.getTop())
                        .stroke()
                        .restoreState();
            }
        }
    }
}

C#

C# 
using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using iText.Kernel.Geom;
using iText.Kernel.Pdf;
using iText.Kernel.Pdf.Canvas;
using iText.Layout;
using iText.Layout.Element;
using iText.Layout.Renderer;

namespace iText.Samples.Sandbox.Events
{
    public class Every25Words
    {
        public static readonly String DEST = "results/sandbox/events/every25words.pdf";

        public static readonly String SRC = "../../../resources/text/liber1_1_la.txt";

        public static void Main(String[] args)
        {
            FileInfo file = new FileInfo(DEST);
            file.Directory.Create();

            new Every25Words().ManipulatePdf(DEST);
        }

        protected void ManipulatePdf(String dest)
        {
            PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
            Document doc = new Document(pdfDoc);

            String file = ReadFile(SRC);
            String[] words = Regex.Split(file, "\\s+");
            Paragraph paragraph = new Paragraph();
            Text text = null;
            int i = 0;
            foreach (String word in words)
            {
                if (text != null)
                {
                    paragraph.Add(" ");
                }

                text = new Text(word);
                text.SetNextRenderer(new Word25TextRenderer(text, ++i));
                paragraph.Add(text);
            }

            doc.Add(paragraph);

            doc.Close();
        }

        private static String ReadFile(String filePath)
        {
            StringBuilder sb = new StringBuilder();

            using (StreamReader reader = new StreamReader(new FileStream(filePath, FileMode.Open), Encoding.UTF8))
            {
                String str;
                while ((str = reader.ReadLine()) != null)
                {
                    sb.Append(str);
                }
            }

            return sb.ToString();
        }

        private class Word25TextRenderer : TextRenderer
        {
            private int count = 0;

            public Word25TextRenderer(Text textElement, int count) : base(textElement)
            {
                this.count = count;
            }

            // 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
            public override IRenderer GetNextRenderer()
            {
                return new Word25TextRenderer((Text) modelElement, count);
            }

            public override void Draw(DrawContext drawContext)
            {
                base.Draw(drawContext);

                // Draws a line to delimit the text every 25 words
                if (0 == count % 25)
                {
                    Rectangle textRect = GetOccupiedAreaBBox();
                    int pageNumber = GetOccupiedArea().GetPageNumber();
                    PdfCanvas canvas = drawContext.GetCanvas();
                    Rectangle pageRect = drawContext.GetDocument().GetPage(pageNumber).GetPageSize();
                    canvas
                        .SaveState()
                        .SetLineDash(5, 5)
                        .MoveTo(pageRect.GetLeft(), textRect.GetBottom())
                        .LineTo(textRect.GetRight(), textRect.GetBottom())
                        .LineTo(textRect.GetRight(), textRect.GetTop())
                        .LineTo(pageRect.GetRight(), textRect.GetTop())
                        .Stroke()
                        .RestoreState();
                }
            }
        }
    }
}
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