/*
* 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.percentages.lines;
import org.pentaho.reporting.libraries.css.resolver.values.ResolveHandler;
import org.pentaho.reporting.libraries.css.keys.font.FontStyleKeys;
import org.pentaho.reporting.libraries.css.keys.line.LineHeight;
import org.pentaho.reporting.libraries.css.keys.line.LineStyleKeys;
import org.pentaho.reporting.libraries.css.model.StyleKey;
import org.pentaho.reporting.libraries.css.dom.LayoutElement;
import org.pentaho.reporting.libraries.css.dom.DocumentContext;
import org.pentaho.reporting.libraries.css.dom.LayoutStyle;
import org.pentaho.reporting.libraries.css.dom.LayoutOutputMetaData;
import org.pentaho.reporting.libraries.css.dom.OutputProcessorFeature;
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.StyleSheetUtility;
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.
*/
public void resolve (final DocumentContext process,
final LayoutElement currentNode,
final StyleKey key)
{
final LayoutStyle layoutContext = currentNode.getLayoutStyle();
final CSSValue value = layoutContext.getValue(key);
if (LineHeight.NONE.equals(value))
{
// query the anchestor, if there's one ..
handleNone(process, currentNode);
return;
}
if (LineHeight.NORMAL.equals(value))
{
handleNormal(process, currentNode);
return;
}
if (value instanceof CSSNumericValue == false)
{
// fall back to normal ..
handleNormal(process, currentNode);
return;
}
final CSSNumericValue nval = (CSSNumericValue) value;
if (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(process, currentNode);
return;
}
final LayoutOutputMetaData metaData = process.getOutputMetaData();
final int resolution = (int) metaData.getNumericFeatureValue(OutputProcessorFeature.DEVICE_RESOLUTION);
final double fontSize = StyleSheetUtility.convertLengthToDouble(value, resolution);
layoutContext.setValue(LineStyleKeys.LINE_HEIGHT,
CSSNumericValue.createValue(CSSNumericType.PT, fontSize * factor));
}
private boolean isLengthValue(final CSSNumericValue nval)
{
final CSSNumericType type = nval.getNumericType();
return (type.isLength());
}
private void handleNormal (final DocumentContext process,
final LayoutElement currentNode)
{
final LayoutStyle layoutContext = currentNode.getLayoutStyle();
final CSSValue value = layoutContext.getValue(FontStyleKeys.FONT_SIZE);
final LayoutOutputMetaData metaData = process.getOutputMetaData();
final int resolution = (int) metaData.getNumericFeatureValue(OutputProcessorFeature.DEVICE_RESOLUTION);
final double fontSize = StyleSheetUtility.convertLengthToDouble(value, resolution);
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 (final DocumentContext process,
final LayoutElement currentNode)
{
final double fontSize;
final LayoutElement parent = currentNode.getParentLayoutElement();
final LayoutStyle layoutContext = currentNode.getLayoutStyle();
if (parent == null)
{
// fall back to normal;
final CSSValue value = layoutContext.getValue(FontStyleKeys.FONT_SIZE);
final LayoutOutputMetaData metaData = process.getOutputMetaData();
final int resolution = (int) metaData.getNumericFeatureValue(OutputProcessorFeature.DEVICE_RESOLUTION);
fontSize = StyleSheetUtility.convertLengthToDouble(value, resolution);
}
else
{
final CSSValue value = parent.getLayoutStyle().getValue(FontStyleKeys.FONT_SIZE);
final LayoutOutputMetaData metaData = process.getOutputMetaData();
final int resolution = (int) metaData.getNumericFeatureValue(OutputProcessorFeature.DEVICE_RESOLUTION);
fontSize = StyleSheetUtility.convertLengthToDouble(value, resolution);
}
layoutContext.setValue(LineStyleKeys.LINE_HEIGHT, CSSNumericValue.createValue(CSSNumericType.PT, fontSize));
}
}