/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* 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 Lesser General Public License for more details.
*
* Copyright (c) 2006 - 2013 Pentaho Corporation.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.layout.process.text;
import java.awt.font.FontRenderContext;
import java.awt.font.LineBreakMeasurer;
import java.awt.font.TextLayout;
import java.text.AttributedCharacterIterator;
import java.util.Iterator;
import org.pentaho.reporting.engine.classic.core.ElementAlignment;
import org.pentaho.reporting.engine.classic.core.layout.model.ParagraphRenderBox;
import org.pentaho.reporting.engine.classic.core.style.ElementStyleKeys;
import org.pentaho.reporting.engine.classic.core.util.geom.StrictGeomUtility;
public class LineBreakIterator implements Iterator<LineBreakIteratorState>
{
private final boolean justifiedLayout;
private final LineBreakMeasurer lineBreakMeasurer;
private final AttributedCharacterIterator ci;
private final float wrappingWidth;
public LineBreakIterator(ParagraphRenderBox box,
FontRenderContext fontRenderContext,
AttributedCharacterIterator ci)
{
this.wrappingWidth = (float) StrictGeomUtility.toExternalValue(box.getCachedWidth());
this.justifiedLayout =
ElementAlignment.JUSTIFY.equals(box.getStyleSheet().getStyleProperty(ElementStyleKeys.ALIGNMENT));
this.ci = ci;
this.lineBreakMeasurer = new LineBreakMeasurer(ci, fontRenderContext);
this.lineBreakMeasurer.setPosition(ci.getBeginIndex());
}
public boolean hasNext()
{
return lineBreakMeasurer.getPosition() < ci.getEndIndex();
}
public LineBreakIteratorState next()
{
// For each line produced by the LinebreakMeasurer
int start = lineBreakMeasurer.getPosition();
// float is the worst option to have accurate layouts. So we have to 'adjust' for rounding errors
// and hope that no one notices ..
TextLayout textLayout = lineBreakMeasurer.nextLayout(wrappingWidth + 0.5f, ci.getEndIndex(), false);
textLayout = postProcess(start, textLayout, lineBreakMeasurer);
int end = lineBreakMeasurer.getPosition();
// check if the text must be justified
return new LineBreakIteratorState(textLayout, start, end);
}
protected TextLayout postProcess(final int start,
final TextLayout textLayout,
final LineBreakMeasurer lineBreakMeasurer)
{
if (justifiedLayout)
{
return textLayout.getJustifiedLayout(wrappingWidth);
}
else
{
return textLayout;
}
}
public void remove()
{
throw new UnsupportedOperationException();
}
}