io.vertigo.dynamo.plugins.export.pdf.PDFAdvancedPageNumberEvents.java Source code

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Here is the source code for io.vertigo.dynamo.plugins.export.pdf.PDFAdvancedPageNumberEvents.java

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/**
 * vertigo - simple java starter
 *
 * Copyright (C) 2013, KleeGroup, direction.technique@kleegroup.com (http://www.kleegroup.com)
 * KleeGroup, Centre d'affaire la Boursidiere - BP 159 - 92357 Le Plessis Robinson Cedex - France
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.vertigo.dynamo.plugins.export.pdf;

import java.io.IOException;

import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfPageEventHelper;
import com.lowagie.text.pdf.PdfTemplate;
import com.lowagie.text.pdf.PdfWriter;

/**
 * Advanced page number x/y events.
 */
final class PDFAdvancedPageNumberEvents extends PdfPageEventHelper {
    // This is the contentbyte object of the writer
    private PdfContentByte cb;

    // we will put the final number of pages in a template
    private PdfTemplate template;

    // this is the BaseFont we are going to use for the header / footer
    private BaseFont bf;

    /**
     * Constructeur.
     */
    PDFAdvancedPageNumberEvents() {
        super();
    }

    /** {@inheritDoc} */
    @Override
    public void onGenericTag(final PdfWriter writer, final Document document, final Rectangle rect,
            final String text) {
        // rien
    }

    /** {@inheritDoc} */
    @Override
    public void onOpenDocument(final PdfWriter writer, final Document document) {
        try {
            bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
            cb = writer.getDirectContent();
            template = cb.createTemplate(50, 50);
        } catch (final DocumentException | IOException e) {
            throw new RuntimeException(e);
        }
    }

    /** {@inheritDoc} */
    @Override
    public void onChapter(final PdfWriter writer, final Document document, final float paragraphPosition,
            final Paragraph title) {
        // rien
    }

    /** {@inheritDoc} */
    @Override
    public void onEndPage(final PdfWriter writer, final Document document) {
        final int pageN = writer.getPageNumber();
        final String text = pageN + " / ";
        final float len = bf.getWidthPoint(text, 8);
        cb.beginText();
        cb.setFontAndSize(bf, 8);
        final float width = document.getPageSize().getWidth();
        cb.setTextMatrix(width / 2, 30);
        cb.showText(text);
        cb.endText();
        cb.addTemplate(template, width / 2 + len, 30);
    }

    /** {@inheritDoc} */
    @Override
    public void onCloseDocument(final PdfWriter writer, final Document document) {
        template.beginText();
        template.setFontAndSize(bf, 8);
        template.showText(String.valueOf(writer.getPageNumber() - 1));
        template.endText();
    }
}