/**
* ===========================================
* 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: WordSpacingResolveHandler.java 3524 2007-10-16 11:26:31Z tmorgner $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.layouter.style.resolver.percentages.text;
import org.jfree.fonts.registry.FontMetrics;
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.keys.text.TextStyleKeys;
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.CSSValueResolverUtility;
import org.jfree.layouting.layouter.style.resolver.ResolveHandler;
import org.jfree.util.Log;
/**
* Creation-Date: 21.12.2005, 15:12:04
*
* @author Thomas Morgner
*/
public class WordSpacingResolveHandler implements ResolveHandler
{
public WordSpacingResolveHandler()
{
}
/**
* 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,
};
}
/**
* Resolves a single property.
*
* @param currentNode
*/
public void resolve(final LayoutProcess process,
final LayoutElement currentNode,
final StyleKey key)
{
// Percentages get resolved against the width of a standard space (0x20)
// character.
final LayoutContext layoutContext = currentNode.getLayoutContext();
final FontSpecification fontSpecification =
layoutContext.getFontSpecification();
final FontMetrics fm = process.getOutputMetaData().getFontMetrics(fontSpecification);
if (fm == null)
{
final CSSValue value = layoutContext.getValue(FontStyleKeys.FONT_FAMILY);
Log.warn ("FontFamily is " + value + " but has not been set?" + currentNode);
return;
}
final double width = StrictGeomUtility.toExternalValue(fm.getCharWidth(0x20));
final CSSNumericValue percentageBase =
CSSNumericValue.createValue(CSSNumericType.PT, width);
final CSSNumericValue min = CSSValueResolverUtility.getLength
(resolveValue(layoutContext, TextStyleKeys.X_MIN_WORD_SPACING), percentageBase);
final CSSNumericValue max = CSSValueResolverUtility.getLength
(resolveValue(layoutContext, TextStyleKeys.X_MAX_WORD_SPACING), percentageBase);
final CSSNumericValue opt = CSSValueResolverUtility.getLength
(resolveValue(layoutContext, TextStyleKeys.X_OPTIMUM_WORD_SPACING), percentageBase);
layoutContext.setValue(TextStyleKeys.X_MIN_WORD_SPACING, min);
layoutContext.setValue(TextStyleKeys.X_MAX_WORD_SPACING, max);
layoutContext.setValue(TextStyleKeys.X_OPTIMUM_WORD_SPACING, opt);
}
private CSSNumericValue resolveValue (final LayoutContext style, final StyleKey key)
{
final CSSValue value = style.getValue(key);
if (value instanceof CSSNumericValue == false)
{
// this also covers the valid 'normal' property.
// it simply means, dont add extra space to the already existing spaces
return CSSNumericValue.ZERO_LENGTH;
}
return (CSSNumericValue) value;
}
}