com.itextpdf.html2pdf.attach.impl.layout.form.renderer.AbstractTextFieldRenderer Maven / Gradle / Ivy

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pdfHTML is an iText 7 add-on that lets you to parse (X)HTML snippets and the associated CSS and converts them to PDF.
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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2020 iText Group NV
    Authors: Bruno Lowagie, Paulo Soares, et al.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License version 3
    as published by the Free Software Foundation with the addition of the
    following permission added to Section 15 as permitted in Section 7(a):
    FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
    ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
    OF THIRD PARTY RIGHTS

    This program is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    or FITNESS FOR A PARTICULAR PURPOSE.
    See the GNU Affero General Public License for more details.
    You should have received a copy of the GNU Affero General Public License
    along with this program; if not, see http://www.gnu.org/licenses or write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA, 02110-1301 USA, or download the license from the following URL:
    http://itextpdf.com/terms-of-use/

    The interactive user interfaces in modified source and object code versions
    of this program must display Appropriate Legal Notices, as required under
    Section 5 of the GNU Affero General Public License.

    In accordance with Section 7(b) of the GNU Affero General Public License,
    a covered work must retain the producer line in every PDF that is created
    or manipulated using iText.

    You can be released from the requirements of the license by purchasing
    a commercial license. Buying such a license is mandatory as soon as you
    develop commercial activities involving the iText software without
    disclosing the source code of your own applications.
    These activities include: offering paid services to customers as an ASP,
    serving PDFs on the fly in a web application, shipping iText with a closed
    source product.

    For more information, please contact iText Software Corp. at this
    address: [email protected]
 */
package com.itextpdf.html2pdf.attach.impl.layout.form.renderer;

import com.itextpdf.forms.fields.PdfFormField;
import com.itextpdf.html2pdf.attach.impl.layout.form.element.IFormField;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.annot.PdfAnnotation;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.property.BoxSizingPropertyValue;
import com.itextpdf.layout.property.Property;
import com.itextpdf.layout.property.TransparentColor;
import com.itextpdf.layout.renderer.BlockRenderer;
import com.itextpdf.layout.renderer.IRenderer;
import com.itextpdf.layout.renderer.LineRenderer;
import com.itextpdf.layout.renderer.ParagraphRenderer;

import java.util.ArrayList;
import java.util.List;

/**
 * Abstract {@link BlockRenderer} for form fields with text content.
 */
public abstract class AbstractTextFieldRenderer extends AbstractFormFieldRenderer {

    /**
     * The font to be used for the text.
     */
    protected PdfFont font;

    /**
     * Creates a new {@link AbstractTextFieldRenderer} instance.
     *
     * @param modelElement the model element
     */
    AbstractTextFieldRenderer(IFormField modelElement) {
        super(modelElement);
    }

    /**
     * Creates a paragraph renderer.
     *
     * @param defaultValue the default value
     * @return the renderer
     */
    IRenderer createParagraphRenderer(String defaultValue) {
        if (defaultValue.trim().isEmpty()) {
            defaultValue = "\u00A0";
        }
        Paragraph paragraph = new Paragraph(defaultValue).setMargin(0);
        return paragraph.createRendererSubTree();
    }

    /**
     * Adjust number of content lines.
     *
     * @param lines the lines that need to be rendered
     * @param bBox  the bounding box
     * @param rows  the desired number of lines
     */
    void adjustNumberOfContentLines(List lines, Rectangle bBox, int rows) {
        if (lines.size() != rows) {
            float rowsHeight = getHeightRowsBased(lines, bBox, rows);
            adjustNumberOfContentLines(lines, bBox, rows, rowsHeight);
        }
    }

    /**
     * Adjust number of content lines.
     *
     * @param lines  the lines that need to be rendered
     * @param bBox   the bounding box
     * @param height the desired height of content
     */
    void adjustNumberOfContentLines(List lines, Rectangle bBox, float height) {
        float averageLineHeight = bBox.getHeight() / lines.size();
        int visibleLinesNumber = (int) Math.ceil(height / averageLineHeight);
        adjustNumberOfContentLines(lines, bBox, visibleLinesNumber, height);
    }

    /**
     * Applies the default field properties.
     *
     * @param inputField the input field
     */
    void applyDefaultFieldProperties(PdfFormField inputField) {
        inputField.getWidgets().get(0).setHighlightMode(PdfAnnotation.HIGHLIGHT_NONE);
        inputField.setBorderWidth(0);
        TransparentColor color = getPropertyAsTransparentColor(Property.FONT_COLOR);
        if (color != null) {
            inputField.setColor(color.getColor());
        }
    }

    float getHeightRowsBased(List lines, Rectangle bBox, int rows) {
        float averageLineHeight = bBox.getHeight() / lines.size();
        return averageLineHeight * rows;
    }

    /**
     * Updates the font.
     *
     * @param renderer the renderer
     */
    void updatePdfFont(ParagraphRenderer renderer) {
        Object retrievedFont;
        if (renderer != null) {
            List lines = renderer.getLines();
            if (lines != null) {
                for (LineRenderer line : lines) {
                    for (IRenderer child : line.getChildRenderers()) {
                        retrievedFont = child.