com.itextpdf.html2pdf.attach.impl.tags.PTagWorker Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2019 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
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or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU Affero General Public License for more details.
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*/
package com.itextpdf.html2pdf.attach.impl.tags;
import com.itextpdf.html2pdf.attach.ITagWorker;
import com.itextpdf.html2pdf.attach.ProcessorContext;
import com.itextpdf.html2pdf.attach.util.WaitingInlineElementsHelper;
import com.itextpdf.html2pdf.css.CssConstants;
import com.itextpdf.layout.IPropertyContainer;
import com.itextpdf.layout.element.AbstractElement;
import com.itextpdf.layout.element.Div;
import com.itextpdf.layout.element.IBlockElement;
import com.itextpdf.layout.element.IElement;
import com.itextpdf.layout.element.ILeafElement;
import com.itextpdf.layout.element.Image;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.styledxmlparser.node.IElementNode;
import java.util.ArrayList;
import java.util.List;
/**
* TagWorker class for the {@code p} element.
*
* This is how this worker processes the <p> tag:
*
* - if the worker meets a text or an inline element, it processes them with a help of
* the {@link com.itextpdf.html2pdf.attach.util.WaitingInlineElementsHelper} instance
*
*
- if the worker meets a block element without inline displaying or
* an inline element with the {@code display: block} style, it wraps all the content which hasn't been handled yet
* into a {@code com.itextpdf.layout.element.Paragraph} object and adds this paragraph to the resultant {@code com.itextpdf.layout.element.Div} object
*
*/
public class PTagWorker implements ITagWorker, IDisplayAware {
/** The latest paragraph object inside tag. */
private Paragraph lastParagraph;
/** The container which handles the elements that are present in the <p> tag. */
private Div elementsContainer;
/** Helper class for waiting inline elements. */
private WaitingInlineElementsHelper inlineHelper;
/** The display value. */
private String display;
/**
* Creates a new {@link PTagWorker} instance.
*
* @param element the element
* @param context the context
*/
public PTagWorker(IElementNode element, ProcessorContext context) {
lastParagraph = new Paragraph();
inlineHelper = new WaitingInlineElementsHelper(element.getStyles().get(CssConstants.WHITE_SPACE), element.getStyles().get(CssConstants.TEXT_TRANSFORM));
display = element.getStyles() != null ? element.getStyles().get(CssConstants.DISPLAY) : null;
}
/* (non-Javadoc)
* @see com.itextpdf.html2pdf.attach.ITagWorker#processEnd(com.itextpdf.html2pdf.html.node.IElementNode, com.itextpdf.html2pdf.attach.ProcessorContext)
*/
@Override
public void processEnd(IElementNode element, ProcessorContext context) {
inlineHelper.flushHangingLeaves(lastParagraph);
}
/* (non-Javadoc)
* @see com.itextpdf.html2pdf.attach.ITagWorker#processContent(java.lang.String, com.itextpdf.html2pdf.attach.ProcessorContext)
*/
@Override
public boolean processContent(String content, ProcessorContext context) {
inlineHelper.add(content);
return true;
}
/* (non-Javadoc)
* @see com.itextpdf.html2pdf.attach.ITagWorker#processTagChild(com.itextpdf.html2pdf.attach.ITagWorker, com.itextpdf.html2pdf.attach.ProcessorContext)
*/
@Override
public boolean processTagChild(ITagWorker childTagWorker, ProcessorContext context) {
// TODO child might be inline, however still have display:block; it behaves like a block, however p includes it in own occupied area
IPropertyContainer element = childTagWorker.getElementResult();
if (childTagWorker instanceof ImgTagWorker && CssConstants.BLOCK.equals(((ImgTagWorker) childTagWorker).getDisplay())) {
IPropertyContainer propertyContainer = childTagWorker.getElementResult();
processBlockElement((Image) propertyContainer);
return true;
} else if (element instanceof ILeafElement) {
inlineHelper.add((ILeafElement) element);
return true;
} else if (isBlockWithDisplay(childTagWorker, element, CssConstants.INLINE_BLOCK, false)) {
inlineHelper.add((IBlockElement) element);
return true;
} else if (isBlockWithDisplay(childTagWorker, element,CssConstants.BLOCK, false)) {
IPropertyContainer propertyContainer = childTagWorker.getElementResult();
processBlockElement((IBlockElement) propertyContainer);
return true;
} else if (childTagWorker instanceof SpanTagWorker) {
boolean allChildrenProcessed = true;
for (IPropertyContainer propertyContainer : ((SpanTagWorker) childTagWorker).getAllElements()) {
if (propertyContainer instanceof ILeafElement) {
inlineHelper.add((ILeafElement) propertyContainer);
} else if (isBlockWithDisplay(childTagWorker, propertyContainer, CssConstants.INLINE_BLOCK, true)) {
inlineHelper.add((IBlockElement) propertyContainer);
} else if (isBlockWithDisplay(childTagWorker, propertyContainer, CssConstants.BLOCK, true)) {
processBlockElement((IBlockElement) propertyContainer);
} else {
allChildrenProcessed = false;
}
}
return allChildrenProcessed;
}
return false;
}
/* (non-Javadoc)
* @see com.itextpdf.html2pdf.attach.ITagWorker#getElementResult()
*/
@Override
public IPropertyContainer getElementResult() {
return null == elementsContainer ? (IPropertyContainer) lastParagraph : (IPropertyContainer) elementsContainer;
}
@Override
public String getDisplay() {
return display;
}
private void processBlockElement(IElement propertyContainer) {
if (elementsContainer == null) {
elementsContainer = new Div();
elementsContainer.add(lastParagraph);
}
inlineHelper.flushHangingLeaves(lastParagraph);
if (propertyContainer instanceof Image) {
elementsContainer.add((Image) propertyContainer);
} else {
elementsContainer.add((IBlockElement) propertyContainer);
}
lastParagraph = new Paragraph();
elementsContainer.add(lastParagraph);
}
private boolean isBlockWithDisplay(ITagWorker childTagWorker, IPropertyContainer element,
String displayMode, boolean isChild) {
if (isChild) {
return element instanceof IBlockElement &&
displayMode.equals(((SpanTagWorker) childTagWorker).getElementDisplay(element));
} else {
return element instanceof IBlockElement &&
childTagWorker instanceof IDisplayAware &&
displayMode.equals(((IDisplayAware) childTagWorker).getDisplay());
}
}
}