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iText, a free Java-PDF library
/*
* $Id: FloatLayout.java 5914 2013-07-28 14:18:11Z blowagie $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2013 1T3XT BVBA
* 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 1T3XT,
* 1T3XT 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.text.pdf;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.api.Spaceable;
import java.util.ArrayList;
import java.util.List;
/**
* Helper class for PdfDiv to put a collection of Element objects
* at an absolute position.
*/
public class FloatLayout {
protected float maxY;
protected float minY;
protected float leftX;
protected float rightX;
public float getYLine() {
return yLine;
}
public void setYLine(float yLine) {
this.yLine = yLine;
}
protected float yLine;
protected float floatLeftX;
protected float floatRightX;
public float getFilledWidth() {
return filledWidth;
}
public void setFilledWidth(float filledWidth) {
this.filledWidth = filledWidth;
}
protected float filledWidth;
protected final ColumnText compositeColumn;
protected final List content;
protected final boolean useAscender;
public FloatLayout(List elements, boolean useAscender) {
compositeColumn = new ColumnText(null);
compositeColumn.setUseAscender(useAscender);
this.useAscender = useAscender;
content = elements;
}
public void setSimpleColumn(final float llx, final float lly, final float urx, final float ury) {
leftX = Math.min(llx, urx);
maxY = Math.max(lly, ury);
minY = Math.min(lly, ury);
rightX = Math.max(llx, urx);
floatLeftX = leftX;
floatRightX = rightX;
yLine = maxY;
filledWidth = 0;
}
public int layout(PdfContentByte canvas, boolean simulate) throws DocumentException {
compositeColumn.setCanvas(canvas);
int status = ColumnText.NO_MORE_TEXT;
filledWidth = 0;
ArrayList floatingElements = new ArrayList();
List content = simulate ? new ArrayList(this.content) : this.content;
while (!content.isEmpty()) {
if (content.get(0) instanceof PdfDiv) {
PdfDiv floatingElement = (PdfDiv)content.get(0);
if (floatingElement.getFloatType() == PdfDiv.FloatType.LEFT || floatingElement.getFloatType() == PdfDiv.FloatType.RIGHT) {
floatingElements.add(floatingElement);
content.remove(0);
} else {
if (!floatingElements.isEmpty()) {
status = floatingLayout(floatingElements, simulate);
if ((status & ColumnText.NO_MORE_TEXT) == 0) {
break;
}
}
content.remove(0);
status = floatingElement.layout(canvas, useAscender, true, floatLeftX, minY, floatRightX, yLine);
if (!simulate) {
canvas.openMCBlock(floatingElement);
status = floatingElement.layout(canvas, useAscender, simulate, floatLeftX, minY, floatRightX, yLine);
canvas.closeMCBlock(floatingElement);
}
yLine -= floatingElement.getActualHeight();
if (floatingElement.getActualWidth() > filledWidth) {
filledWidth = floatingElement.getActualWidth();
}
if ((status & ColumnText.NO_MORE_TEXT) == 0) {
content.add(0, floatingElement);
break;
}
}
} else {
floatingElements.add(content.get(0));
content.remove(0);
}
}
if ((status & ColumnText.NO_MORE_TEXT) != 0 && !floatingElements.isEmpty()) {
status = floatingLayout(floatingElements, simulate);
}
content.addAll(0, floatingElements);
return status;
}
private int floatingLayout(List floatingElements, boolean simulate) throws DocumentException {
int status = ColumnText.NO_MORE_TEXT;
float minYLine = yLine;
float leftWidth = 0;
float rightWidth = 0;
ColumnText currentCompositeColumn = compositeColumn;
if (simulate) {
currentCompositeColumn = ColumnText.duplicate(compositeColumn);
}
while (!floatingElements.isEmpty()) {
Element nextElement = floatingElements.get(0);
floatingElements.remove(0);
if (nextElement instanceof PdfDiv) {
PdfDiv floatingElement = (PdfDiv) nextElement;
status = floatingElement.layout(compositeColumn.getCanvas(), useAscender, true, floatLeftX, minY, floatRightX, yLine);
if ((status & ColumnText.NO_MORE_TEXT) == 0) {
yLine = minYLine;
floatLeftX = leftX;
floatRightX = rightX;
status = floatingElement.layout(compositeColumn.getCanvas(), useAscender, true, floatLeftX, minY, floatRightX, yLine);
if ((status & ColumnText.NO_MORE_TEXT) == 0) {
floatingElements.add(0, floatingElement);
break;
}
}
if (floatingElement.getFloatType() == PdfDiv.FloatType.LEFT) {
status = floatingElement.layout(compositeColumn.getCanvas(), useAscender, simulate, floatLeftX, minY, floatRightX, yLine);
floatLeftX += floatingElement.getActualWidth();
leftWidth += floatingElement.getActualWidth();
} else if (floatingElement.getFloatType() == PdfDiv.FloatType.RIGHT) {
status = floatingElement.layout(compositeColumn.getCanvas(), useAscender, simulate, floatRightX - floatingElement.getActualWidth() - 0.01f, minY, floatRightX, yLine);
floatRightX -= floatingElement.getActualWidth();
rightWidth += floatingElement.getActualWidth();
}
minYLine = Math.min(minYLine, yLine - floatingElement.getActualHeight());
} else {
if (nextElement instanceof Spaceable) {
yLine -= ((Spaceable) nextElement).getSpacingBefore();
}
if (simulate) {
if (nextElement instanceof PdfPTable)
currentCompositeColumn.addElement(new PdfPTable((PdfPTable)nextElement));
else
currentCompositeColumn.addElement(nextElement);
} else {
currentCompositeColumn.addElement(nextElement);
}
if (yLine > minYLine)
currentCompositeColumn.setSimpleColumn(floatLeftX, yLine, floatRightX, minYLine);
else
currentCompositeColumn.setSimpleColumn(floatLeftX, yLine, floatRightX, minY);
currentCompositeColumn.setFilledWidth(0);
status = currentCompositeColumn.go(simulate);
if (yLine > minYLine && (floatLeftX > leftX || floatRightX < rightX) && (status & ColumnText.NO_MORE_TEXT) == 0) {
yLine = minYLine;
floatLeftX = leftX;
floatRightX = rightX;
if (leftWidth != 0 && rightWidth != 0) {
filledWidth = rightX - leftX;
} else {
if (leftWidth > filledWidth) {
filledWidth = leftWidth;
}
if (rightWidth > filledWidth) {
filledWidth = rightWidth;
}
}
leftWidth = 0;
rightWidth = 0;
if (simulate && nextElement instanceof PdfPTable) {
currentCompositeColumn.addElement(new PdfPTable((PdfPTable)nextElement));
}
currentCompositeColumn.setSimpleColumn(floatLeftX, yLine, floatRightX, minY);
status = currentCompositeColumn.go(simulate);
minYLine = currentCompositeColumn.getYLine() + currentCompositeColumn.getDescender();
yLine = minYLine;
if (currentCompositeColumn.getFilledWidth() > filledWidth) {
filledWidth = currentCompositeColumn.getFilledWidth();
}
} else {
if (rightWidth > 0) {
rightWidth += currentCompositeColumn.getFilledWidth();
} else if (leftWidth > 0) {
leftWidth += currentCompositeColumn.getFilledWidth();
} else if (currentCompositeColumn.getFilledWidth() > filledWidth) {
filledWidth = currentCompositeColumn.getFilledWidth();
}
minYLine = Math.min(currentCompositeColumn.getYLine() + currentCompositeColumn.getDescender(), minYLine);
yLine = currentCompositeColumn.getYLine() + currentCompositeColumn.getDescender();
}
if ((status & ColumnText.NO_MORE_TEXT) == 0) {
if (!simulate) {
floatingElements.addAll(0, currentCompositeColumn.getCompositeElements());
currentCompositeColumn.getCompositeElements().clear();
} else {
floatingElements.add(0, nextElement);
currentCompositeColumn.setText(null);
}
break;
} else {
currentCompositeColumn.setText(null);
}
}
}
if (leftWidth != 0 && rightWidth != 0) {
filledWidth = rightX - leftX;
} else {
if (leftWidth > filledWidth) {
filledWidth = leftWidth;
}
if (rightWidth > filledWidth) {
filledWidth = rightWidth;
}
}
yLine = minYLine;
floatLeftX = leftX;
floatRightX = rightX;
return status;
}
}