fll.util.SimpleFooterHandler.java Source code

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Here is the source code for fll.util.SimpleFooterHandler.java

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/*
 * Copyright (c) 2010 INSciTE.  All rights reserved
 * INSciTE is on the web at: http://www.hightechkids.org
 * This code is released under GPL; see LICENSE.txt for details.
 */

package fll.util;

import com.itextpdf.text.Document;
import com.itextpdf.text.Font;
import com.itextpdf.text.FontFactory;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfPageEventHelper;
import com.itextpdf.text.pdf.PdfTemplate;
import com.itextpdf.text.pdf.PdfWriter;

/**
 * Put page number in the footer of a PDF document.
 */
public class SimpleFooterHandler extends PdfPageEventHelper {

    private PdfTemplate _tpl;

    private BaseFont _headerFooterFont;

    private static final Font TIMES_12PT_NORMAL = FontFactory.getFont(FontFactory.TIMES, 12, Font.NORMAL);

    public SimpleFooterHandler() {
    }

    @Override
    public void onOpenDocument(final PdfWriter writer, final Document document) {
        _headerFooterFont = TIMES_12PT_NORMAL.getBaseFont();

        // initialization of the footer template
        _tpl = writer.getDirectContent().createTemplate(100, 100);
        _tpl.setBoundingBox(new Rectangle(-20, -20, 100, 100));
    }

    @Override
    public void onEndPage(final PdfWriter writer, final Document document) {
        final PdfContentByte cb = writer.getDirectContent();
        cb.saveState();

        // compose the footer
        final String text = "Page " + writer.getPageNumber() + " of ";
        final float textSize = _headerFooterFont.getWidthPoint(text, 12);
        final float textBase = document.bottom() - 20;
        cb.beginText();
        cb.setFontAndSize(_headerFooterFont, 12);

        final float adjust = _headerFooterFont.getWidthPoint("0", 12);
        cb.setTextMatrix(document.right() - textSize - adjust, textBase);
        cb.showText(text);
        cb.endText();
        cb.addTemplate(_tpl, document.right() - adjust, textBase);

        cb.restoreState();
    }

    @Override
    public void onCloseDocument(final PdfWriter writer, final Document document) {
        _tpl.beginText();
        _tpl.setFontAndSize(_headerFooterFont, 12);
        _tpl.setTextMatrix(0, 0);
        _tpl.showText("" + (writer.getPageNumber() - 1));
        _tpl.endText();
    }

}