com.itextpdf.layout.renderer.DocumentRenderer Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2023 Apryse Group NV
Authors: Apryse Software.
This program is offered under a commercial and under the AGPL license.
For commercial licensing, contact us at https://itextpdf.com/sales. For AGPL licensing, see below.
AGPL licensing:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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 wrappedContentPage = new ArrayList<>();
protected TargetCounterHandler targetCounterHandler = new TargetCounterHandler();
public DocumentRenderer(Document document) {
this(document, true);
}
public DocumentRenderer(Document document, boolean immediateFlush) {
this.document = document;
this.immediateFlush = immediateFlush;
this.modelElement = document;
}
/**
* Get handler for target-counters.
*
* @return the {@link TargetCounterHandler} instance
*/
public TargetCounterHandler getTargetCounterHandler() {
return targetCounterHandler;
}
/**
* Indicates if relayout is required for targetCounterHandler.
*
* @return true if relayout is required, false otherwise
*/
public boolean isRelayoutRequired() {
return targetCounterHandler.isRelayoutRequired();
}
@Override
public LayoutArea getOccupiedArea() {
throw new IllegalStateException("Not applicable for DocumentRenderer");
}
/**
* For {@link DocumentRenderer}, this has a meaning of the renderer that will be used for relayout.
*
* @return relayout renderer.
*/
@Override
public IRenderer getNextRenderer() {
DocumentRenderer renderer = new DocumentRenderer(document, immediateFlush);
renderer.targetCounterHandler = new TargetCounterHandler(targetCounterHandler);
return renderer;
}
protected LayoutArea updateCurrentArea(LayoutResult overflowResult) {
flushWaitingDrawingElements(false);
LayoutTaggingHelper taggingHelper = this.getProperty(Property.TAGGING_HELPER);
if (taggingHelper != null) {
taggingHelper.releaseFinishedHints();
}
AreaBreak areaBreak = overflowResult != null && overflowResult.getAreaBreak() != null ?
overflowResult.getAreaBreak() : null;
int currentPageNumber = currentArea == null ? 0 : currentArea.getPageNumber();
if (areaBreak != null && areaBreak.getType() == AreaBreakType.LAST_PAGE) {
while (currentPageNumber < document.getPdfDocument().getNumberOfPages()) {
possiblyFlushPreviousPage(currentPageNumber);
currentPageNumber++;
}
} else {
possiblyFlushPreviousPage(currentPageNumber);
currentPageNumber++;
}
PageSize customPageSize = areaBreak != null ? areaBreak.getPageSize() : null;
while (document.getPdfDocument().getNumberOfPages() >= currentPageNumber &&
document.getPdfDocument().getPage(currentPageNumber).isFlushed()) {
currentPageNumber++;
}
PageSize lastPageSize = ensureDocumentHasNPages(currentPageNumber, customPageSize);
if (lastPageSize == null) {
lastPageSize = new PageSize(document.getPdfDocument().getPage(currentPageNumber).getTrimBox());
}
return (currentArea = new RootLayoutArea(currentPageNumber, getCurrentPageEffectiveArea(lastPageSize)));
}
protected void flushSingleRenderer(IRenderer resultRenderer) {
linkRenderToDocument(resultRenderer, document.getPdfDocument());
Transform transformProp = resultRenderer.getProperty(Property.TRANSFORM);
if (!waitingDrawingElements.contains(resultRenderer)) {
processWaitingDrawing(resultRenderer, transformProp, waitingDrawingElements);
if (FloatingHelper.isRendererFloating(resultRenderer) || transformProp != null)
return;
}
// TODO Remove checking occupied area to be not null when DEVSIX-1655 is resolved.
if (!resultRenderer.isFlushed() && null != resultRenderer.getOccupiedArea()) {
int pageNum = resultRenderer.getOccupiedArea().getPageNumber();
PdfDocument pdfDocument = document.getPdfDocument();
ensureDocumentHasNPages(pageNum, null);
PdfPage correspondingPage = pdfDocument.getPage(pageNum);
if (correspondingPage.isFlushed()) {
throw new PdfException(LayoutExceptionMessageConstant.CANNOT_DRAW_ELEMENTS_ON_ALREADY_FLUSHED_PAGES);
}
boolean wrapOldContent = pdfDocument.getReader() != null && pdfDocument.getWriter() != null &&
correspondingPage.getContentStreamCount() > 0 &&
correspondingPage.getLastContentStream().getLength() > 0 &&
!wrappedContentPage.contains(pageNum) && pdfDocument.getNumberOfPages() >= pageNum;
wrappedContentPage.add(pageNum);
if (pdfDocument.isTagged()) {
pdfDocument.getTagStructureContext().getAutoTaggingPointer().setPageForTagging(correspondingPage);
}
resultRenderer.draw(new DrawContext(pdfDocument,
new PdfCanvas(correspondingPage, wrapOldContent), pdfDocument.isTagged()));
}
}
/**
* Adds new page with defined page size to PDF document.
*
* @param customPageSize the size of new page, can be null
* @return the page size of created page
*/
protected PageSize addNewPage(PageSize customPageSize) {
if (customPageSize != null) {
document.getPdfDocument().addNewPage(customPageSize);
} else {
document.getPdfDocument().addNewPage();
}
return customPageSize != null ? customPageSize : document.getPdfDocument().getDefaultPageSize();
}
/**
* Ensures that PDF document has n pages. If document has fewer pages,
* adds new pages by calling {@link #addNewPage(PageSize)} method.
*
* @param n the expected number of pages if document
* @param customPageSize the size of created pages, can be null
* @return the page size of the last created page, or null if no page was created
*/
protected PageSize ensureDocumentHasNPages(int n, PageSize customPageSize) {
PageSize lastPageSize = null;
while (document.getPdfDocument().getNumberOfPages() < n) {
lastPageSize = addNewPage(customPageSize);
}
return lastPageSize;
}
private Rectangle getCurrentPageEffectiveArea(PageSize pageSize) {
float leftMargin = (float) getPropertyAsFloat(Property.MARGIN_LEFT);
float bottomMargin = (float) getPropertyAsFloat(Property.MARGIN_BOTTOM);
float topMargin = (float) getPropertyAsFloat(Property.MARGIN_TOP);
float rightMargin = (float) getPropertyAsFloat(Property.MARGIN_RIGHT);
return new Rectangle(pageSize.getLeft() + leftMargin,
pageSize.getBottom() + bottomMargin,
pageSize.getWidth() - leftMargin - rightMargin,
pageSize.getHeight() - bottomMargin - topMargin);
}
private void possiblyFlushPreviousPage(int currentPageNumber) {
if (immediateFlush && currentPageNumber > 1) {
// We don't flush current page immediately, but only flush previous one
// because of manipulations with areas in case of keepTogether property
document.getPdfDocument().getPage(currentPageNumber - 1).flush();
}
}
}