/**
* ===========================================
* 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: ColorResolveHandler.java,v 1.9 2007/04/02 11:41:14 taqua Exp $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.layouter.style.resolver.computed.color;
import org.jfree.layouting.LayoutProcess;
import org.jfree.layouting.input.style.StyleKey;
import org.jfree.layouting.input.style.keys.color.CSSSystemColors;
import org.jfree.layouting.input.style.keys.color.ColorStyleKeys;
import org.jfree.layouting.input.style.keys.color.HtmlColors;
import org.jfree.layouting.input.style.values.CSSColorValue;
import org.jfree.layouting.input.style.values.CSSConstant;
import org.jfree.layouting.input.style.values.CSSFunctionValue;
import org.jfree.layouting.input.style.values.CSSValue;
import org.jfree.layouting.layouter.context.LayoutContext;
import org.jfree.layouting.layouter.model.LayoutElement;
import org.jfree.layouting.layouter.style.functions.FunctionEvaluationException;
import org.jfree.layouting.layouter.style.functions.FunctionFactory;
import org.jfree.layouting.layouter.style.functions.values.StyleValueFunction;
import org.jfree.layouting.layouter.style.resolver.ResolveHandler;
import org.jfree.layouting.util.ColorUtil;
/**
* Creation-Date: 11.12.2005, 23:28:29
*
* @author Thomas Morgner
*/
public class ColorResolveHandler implements ResolveHandler
{
public ColorResolveHandler()
{
}
/**
* 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[0];
}
/**
* Resolves a single property.
*
* @param currentNode
* @param style
*/
public void resolve(LayoutProcess process,
LayoutElement currentNode,
StyleKey key)
{
LayoutContext style = currentNode.getLayoutContext();
CSSValue value = style.getValue(key);
if (value instanceof CSSColorValue)
{
return;
}
// it might as well be a RGB- or HSL- function.
if (value instanceof CSSFunctionValue)
{
CSSFunctionValue functionValue = (CSSFunctionValue) value;
StyleValueFunction function =
FunctionFactory.getInstance().getStyleFunction
(functionValue.getFunctionName());
if (function == null)
{
value = HtmlColors.BLACK;
}
else
{
try
{
value = function.evaluate(process, currentNode, functionValue);
}
catch (FunctionEvaluationException e)
{
value = HtmlColors.BLACK;
}
}
if (value instanceof CSSColorValue)
{
style.setValue(key, value);
return;
}
}
if (value instanceof CSSConstant == false)
{
style.setValue(key, HtmlColors.BLACK);
return;
}
if (CSSSystemColors.CURRENT_COLOR.equals(value))
{
style.setValue(key, getCurrentColor(currentNode));
return;
}
CSSValue c = ColorUtil.parseIdentColor(value.getCSSText());
if (c != null)
{
style.setValue(key, c);
}
else
{
style.setValue(key, HtmlColors.BLACK);
}
}
protected CSSColorValue getCurrentColor (LayoutElement currentNode)
{
LayoutElement parent = currentNode.getParent();
if (parent != null)
{
final LayoutContext layoutContext = parent.getLayoutContext();
CSSValue value = layoutContext.getValue(ColorStyleKeys.COLOR);
if (value instanceof CSSColorValue)
{
return (CSSColorValue) value;
}
}
return (HtmlColors.BLACK);
}
}