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Parses XML to PDF, with CSS support, using iText
/*
* $Id: b4ef7859096672d32b551db08d578820fcbd2e1f $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2016 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.apply;
import java.util.List;
import java.util.Map;
import com.itextpdf.tool.xml.Tag;
import com.itextpdf.tool.xml.css.CSS;
import com.itextpdf.tool.xml.css.CssUtils;
import com.itextpdf.tool.xml.css.FontSizeTranslator;
/**
* Serves as a container class for the largest font size and/or largest leading found in a tag and all its siblings.
*
* @author Emiel Ackermann
*
*/
public final class MaxLeadingAndSize {
private final CssUtils utils = CssUtils.getInstance();
private final FontSizeTranslator fontSizeTranslator = FontSizeTranslator.getInstance();
private float largestLeading;
private float largestFont;
/**
*
* @return largest leading
*/
public float getLargestLeading() {
return largestLeading;
}
/**
*
* @return largest font size
*/
public float getLargestFont() {
return largestFont;
}
/**
* Sets largest font size and largest leading based on the css styles "font-size" and "line-height" of a given tag and its children.
* @param t tag of which the variables need to be set.
*/
public void setVariablesBasedOnChildren(final Tag t) {
float fontSizeParent = fontSizeTranslator.getFontSize(t);
float largestFontChildren = getLargestFontFromChildren(t.getChildren());
largestFont = fontSizeParent>largestFontChildren?fontSizeParent:largestFontChildren;
float leadingParent = calculateLeading(t);
float largestLeadingChildren = getLargestLeadingFromChildren(t.getChildren());
largestLeading = leadingParent>largestLeadingChildren?leadingParent:largestLeadingChildren;
}
/**
* Set the largest leading based on calculateLeading only. (Children not taken into account)
* @param tag the tag
*/
public void setLeading(final Tag tag) {
largestLeading = calculateLeading(tag);
}
/**
* Iterates over all children in a List and returns the largest font size found.
* @param children List containing a list of children.
* @return float largest font size.
*/
public float getLargestFontFromChildren(final List children) {
float largestFont = 12;
for(Tag tag: children) {
float fontSize = fontSizeTranslator.getFontSize(tag);
if(fontSize > largestFont) {
largestFont = fontSize;
}
}
return largestFont;
}
/**
* Iterates over all children in a List and returns the largest leading found.
* @param children List containing a list of children.
* @return float largest leading.
*/
private float getLargestLeadingFromChildren(final List children) {
float leading = 0;
for(Tag tag: children) {
Float calculatedLineHeight = calculateLeading(tag);
if(calculatedLineHeight > leading) {
leading = calculatedLineHeight;
}
getLargestLeadingFromChildren(tag.getChildren());
}
return leading;
}
/**
* Calculates the leading of the given tag.
*
* First checks which line-height string is present in the css of the tag, if any. Following strings are allowed;
*
* - a constant (containing px, in, cm, mm, pc, em, ex or pt),
* - percentage (containing %),
* - multiplier (only digits),
*
* Then this methods calculates the leading based on the font-size and the line-height.
* If no line-height was given or if the line-height:normal was given, leading = font-size * 1.5f.
* @param t tag of which the leading has to be calculated.
* @return float containing the leading of the tag.
*/
public Float calculateLeading(final Tag t) {
float leading = 0;
Map css = t.getCSS();
float fontSize = fontSizeTranslator.getFontSize(t);
if(css.get(CSS.Property.LINE_HEIGHT) != null) {
String value = css.get(CSS.Property.LINE_HEIGHT);
if(utils.isNumericValue(value)) {
leading = Float.parseFloat(value) * fontSize;
} else if (utils.isRelativeValue(value)) {
leading = utils.parseRelativeValue(value, fontSize);
} else if (utils.isMetricValue(value)){
leading = utils.parsePxInCmMmPcToPt(value);
}
// a faulty value was entered for line-height.
if (leading == 0) {
leading = fontSize*1.5f;
}
} else {
leading = fontSize*1.5f;
}
return leading;
}
}