com.itextpdf.tool.xml.css.WidthCalculator Maven / Gradle / Ivy
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Parses XML to PDF, with CSS support, using iText
/*
* $Id: 5b0ffd0351ba14c12f5ac85031c2e7fcccce8f83 $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2015 iText Group NV
* Authors: Balder Van Camp, Emiel Ackermann, 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.tool.xml.css;
import java.util.List;
import com.itextpdf.tool.xml.Tag;
import com.itextpdf.tool.xml.html.HTML;
/**
* @author Emiel Ackermann
*
*/
public class WidthCalculator {
private final CssUtils utils = CssUtils.getInstance();
/**
* Tries to calculate a width from a tag and it's ancestors.
* @param tag the tag to use
* @param roottags the root tags,
* @param pagewidth the page width
* @return the width
*/
public float getWidth(final Tag tag, final List roottags, final float pagewidth){
return getWidth(tag, roottags, pagewidth, -1);
}
public float getWidth(final Tag tag, final List roottags, final float pagewidth, final float initialTotalWidth){
float width = 0;
String widthValue = tag.getCSS().get(HTML.Attribute.WIDTH);
if(widthValue == null) {
widthValue = tag.getAttributes().get(HTML.Attribute.WIDTH);
}
if(widthValue != null) {
if(utils.isNumericValue(widthValue) || utils.isMetricValue(widthValue)) {
width = utils.parsePxInCmMmPcToPt(widthValue);
} else if (utils.isRelativeValue(widthValue)) {
Tag ancestor = tag;
float firstAncestorsWidth = 0;
while(firstAncestorsWidth == 0 && ancestor.getParent() != null) {
ancestor = ancestor.getParent();
firstAncestorsWidth = getWidth(ancestor, roottags, pagewidth, initialTotalWidth);
}
if (firstAncestorsWidth == 0) {
width = utils.parseRelativeValue(widthValue, pagewidth);
} else {
width = utils.parseRelativeValue(widthValue, firstAncestorsWidth);
}
}
} else if (roottags.contains(tag.getName())){
if (Float.compare(initialTotalWidth, -1) == 0)
width = pagewidth;
else
width = initialTotalWidth;
}
return width;
}
}