/**
* ===========================================
* 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: LineHeightResolveHandler.java,v 1.10 2007/04/02 11:41:15 taqua Exp $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.layouter.style.resolver.percentages.line;
import org.jfree.layouting.LayoutProcess;
import org.jfree.layouting.input.style.StyleKey;
import org.jfree.layouting.input.style.keys.font.FontStyleKeys;
import org.jfree.layouting.input.style.keys.line.LineHeight;
import org.jfree.layouting.input.style.keys.line.LineStyleKeys;
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.LayoutContext;
import org.jfree.layouting.layouter.model.LayoutElement;
import org.jfree.layouting.layouter.style.CSSValueResolverUtility;
import org.jfree.layouting.layouter.style.resolver.ResolveHandler;
public class LineHeightResolveHandler implements ResolveHandler
{
public LineHeightResolveHandler ()
{
}
/**
* This indirectly defines the resolve order. The higher the order, the more dependent
* is the resolver on other resolvers to be complete.
*
* @return the array of required style keys.
*/
public StyleKey[] getRequiredStyles ()
{
return new StyleKey[] {
FontStyleKeys.FONT_SIZE,
FontStyleKeys.FONT_SIZE_ADJUST,
};
}
/**
* Resolves a single property.
*
* @param currentNode
* @param style
*/
public void resolve (LayoutProcess process,
LayoutElement currentNode,
StyleKey key)
{
LayoutContext layoutContext = currentNode.getLayoutContext();
CSSValue value = layoutContext.getValue(key);
if (LineHeight.NONE.equals(value))
{
// query the anchestor, if there's one ..
handleNone(currentNode);
return;
}
if (LineHeight.NORMAL.equals(value))
{
handleNormal(currentNode);
return;
}
if (value instanceof CSSNumericValue == false)
{
// fall back to normal ..
handleNormal(currentNode);
return;
}
CSSNumericValue nval = (CSSNumericValue) value;
if (CSSValueResolverUtility.isLengthValue(nval))
{
layoutContext.setValue(LineStyleKeys.LINE_HEIGHT, nval);
return;
}
final double factor;
if (nval.getType().equals(CSSNumericType.PERCENTAGE))
{
factor = nval.getValue() / 100d;
}
else if (nval.getType().equals(CSSNumericType.NUMBER))
{
factor = nval.getValue();
}
else
{
handleNormal(currentNode);
return;
}
final double fontSize = layoutContext.getFontSpecification().getFontSize();
layoutContext.setValue(LineStyleKeys.LINE_HEIGHT,
CSSNumericValue.createValue(CSSNumericType.PT, fontSize * factor));
}
private void handleNormal (LayoutElement currentNode)
{
final LayoutContext layoutContext = currentNode.getLayoutContext();
final double fontSize = layoutContext.getFontSpecification().getFontSize();
if (fontSize < 10)
{
layoutContext.setValue(LineStyleKeys.LINE_HEIGHT,
CSSNumericValue.createValue(CSSNumericType.PT, fontSize * 1.2));
}
else if (fontSize < 24)
{
layoutContext.setValue(LineStyleKeys.LINE_HEIGHT,
CSSNumericValue.createValue(CSSNumericType.PT, fontSize * 1.1));
}
else
{
layoutContext.setValue(LineStyleKeys.LINE_HEIGHT,
CSSNumericValue.createValue(CSSNumericType.PT, fontSize * 1.05));
}
}
private void handleNone (LayoutElement currentNode)
{
final double fontSize;
final LayoutElement parent = currentNode.getParent();
final LayoutContext layoutContext = currentNode.getLayoutContext();
if (parent == null)
{
// fall back to normal;
fontSize = layoutContext.getFontSpecification().getFontSize();
}
else
{
fontSize = parent.getLayoutContext().getFontSpecification().getFontSize();
}
layoutContext.setValue(LineStyleKeys.LINE_HEIGHT, CSSNumericValue.createValue(CSSNumericType.PT, fontSize));
}
}