/**
* ===========================================
* LibLayout : a free Java layouting library
* ===========================================
*
* Project Info: http://reporting.pentaho.org/liblayout/
*
* (C) Copyright 2006-2007, by Pentaho Corporation and Contributors.
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library 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.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* ------------
* $Id: FontSizeAdjustResolveHandler.java 6653 2008-12-02 14:53:40Z tmorgner $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.layouter.style.resolver.percentages.fonts;
import org.jfree.layouting.LayoutProcess;
import org.jfree.layouting.util.geom.StrictGeomUtility;
import org.jfree.layouting.input.style.StyleKey;
import org.jfree.layouting.input.style.keys.font.FontStyleKeys;
import org.jfree.layouting.input.style.values.CSSNumericType;
import org.jfree.layouting.input.style.values.CSSNumericValue;
import org.jfree.layouting.input.style.values.CSSValue;
import org.jfree.layouting.layouter.context.FontSpecification;
import org.jfree.layouting.layouter.context.LayoutContext;
import org.jfree.layouting.layouter.model.LayoutElement;
import org.jfree.layouting.layouter.style.resolver.ResolveHandler;
import org.pentaho.reporting.libraries.fonts.registry.FontMetrics;
/**
* Creation-Date: 18.12.2005, 19:46:43
*
* @author Thomas Morgner
*/
public class FontSizeAdjustResolveHandler implements ResolveHandler
{
public FontSizeAdjustResolveHandler()
{
}
/**
* This indirectly defines the resolve order. The higher the order, the more
* dependent is the resolver on other resolvers to be complete.
*
* @return
*/
public StyleKey[] getRequiredStyles()
{
return new StyleKey[]{
FontStyleKeys.FONT_SIZE,
FontStyleKeys.FONT_FAMILY,
FontStyleKeys.FONT_EFFECT,
FontStyleKeys.FONT_SMOOTH,
FontStyleKeys.FONT_STRETCH,
FontStyleKeys.FONT_VARIANT,
FontStyleKeys.FONT_WEIGHT,
};
}
public void resolve(final LayoutProcess process,
final LayoutElement currentNode,
final StyleKey key)
{
final LayoutContext layoutContext = currentNode.getLayoutContext();
final CSSValue value = layoutContext.getValue(key);
if (value instanceof CSSNumericValue == false)
{
return; // do nothing
}
final CSSNumericValue nval = (CSSNumericValue) value;
if (CSSNumericType.NUMBER.equals(nval.getType()) == false)
{
return; // syntax error, do nothing
}
final LayoutElement parent = currentNode.getParent();
if (parent == null)
{
return; // no parent to resolve against ...
}
final double adjustFactor = nval.getValue();
final FontSpecification fontSpecification =
currentNode.getLayoutContext().getFontSpecification();
final FontMetrics fontMetrics =
process.getOutputMetaData().getFontMetrics(fontSpecification);
if (fontMetrics == null)
{
return; // no font metrics means no valid font...
}
final double actualFontXHeight = StrictGeomUtility.toExternalValue(fontMetrics.getXHeight());
final double fontSize = fontSpecification.getFontSize();
final double aspectRatio = actualFontXHeight / fontSize;
final double result = (fontSize * (adjustFactor / aspectRatio));
fontSpecification.setFontSize(result);
}
}