/*
* 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 and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.css.resolver.values.computed.fonts;
import org.pentaho.reporting.libraries.css.model.StyleKey;
import org.pentaho.reporting.libraries.css.keys.font.FontWeight;
import org.pentaho.reporting.libraries.css.keys.font.FontStyleKeys;
import org.pentaho.reporting.libraries.css.values.CSSValue;
import org.pentaho.reporting.libraries.css.values.CSSNumericValue;
import org.pentaho.reporting.libraries.css.values.CSSNumericType;
import org.pentaho.reporting.libraries.css.resolver.values.ResolveHandler;
import org.pentaho.reporting.libraries.css.dom.LayoutElement;
import org.pentaho.reporting.libraries.css.dom.DocumentContext;
import org.pentaho.reporting.libraries.css.dom.LayoutStyle;
/**
* Creation-Date: 18.12.2005, 20:33:42
*
* @author Thomas Morgner
*/
public class FontWeightResolveHandler implements ResolveHandler
{
private static final StyleKey[] EMPTY_KEYS = new StyleKey[0];
public FontWeightResolveHandler()
{
}
/**
* 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 EMPTY_KEYS;
}
/**
* Resolves a single property.
*
* @param currentNode
* @param style
*/
public void resolve(final DocumentContext process,
final LayoutElement currentNode,
final StyleKey key)
{
final LayoutStyle layoutContext = currentNode.getLayoutStyle();
final CSSValue value = layoutContext.getValue(key);
final int fontWeight;
if (FontWeight.BOLD.equals(value))
{
// ask the parent ...
fontWeight = 700;
}
else if (FontWeight.NORMAL.equals(value))
{
// ask the parent ...
fontWeight = 400;
}
else if (FontWeight.BOLDER.equals(value))
{
final int parentFontWeight = queryParent(currentNode.getParentLayoutElement());
fontWeight = Math.max (900, parentFontWeight + 100);
}
else if (FontWeight.LIGHTER.equals(value))
{
final int parentFontWeight = queryParent(currentNode.getParentLayoutElement());
fontWeight = Math.min (100, parentFontWeight - 100);
}
else if (value instanceof CSSNumericValue)
{
final CSSNumericValue nval = (CSSNumericValue) value;
if (CSSNumericType.NUMBER.equals(nval.getType()) == false)
{
// preserve the parent's weight...
fontWeight = queryParent(currentNode.getParentLayoutElement());
}
else
{
fontWeight = (int) nval.getValue();
}
}
else
{
fontWeight = queryParent(currentNode.getParentLayoutElement());
}
layoutContext.setValue(FontStyleKeys.FONT_WEIGHT, CSSNumericValue.createValue(CSSNumericType.NUMBER, fontWeight));
}
private int queryParent(final LayoutElement parent)
{
if (parent == null)
{
return 400; // Normal
}
final CSSValue value = parent.getLayoutStyle().getValue(FontStyleKeys.FONT_WEIGHT);
if (value instanceof CSSNumericValue == false)
{
throw new IllegalStateException("Parent was not resolved correctly");
}
CSSNumericValue nval = (CSSNumericValue) value;
if (CSSNumericType.NUMBER.equals(nval.getType()) == false)
{
throw new IllegalStateException("Parent was not resolved correctly");
}
return (int) nval.getValue();
}
}