/*
* 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.StyleSheetUtility;
import org.pentaho.reporting.libraries.css.dom.DocumentContext;
import org.pentaho.reporting.libraries.css.dom.LayoutElement;
import org.pentaho.reporting.libraries.css.dom.LayoutOutputMetaData;
import org.pentaho.reporting.libraries.css.dom.LayoutStyle;
import org.pentaho.reporting.libraries.css.dom.OutputProcessorFeature;
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.resolver.values.ResolveHandler;
import org.pentaho.reporting.libraries.css.values.CSSNumericType;
import org.pentaho.reporting.libraries.css.values.CSSNumericValue;
import org.pentaho.reporting.libraries.css.values.CSSValue;
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 ) );
}
}