/**
* ===========================================
* 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: PositionResolveHandler.java,v 1.8 2007/04/02 11:41:15 taqua Exp $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.layouter.style.resolver.computed.position;
import org.jfree.layouting.LayoutProcess;
import org.jfree.layouting.input.style.StyleKey;
import org.jfree.layouting.input.style.keys.box.BoxStyleKeys;
import org.jfree.layouting.input.style.keys.box.DisplayModel;
import org.jfree.layouting.input.style.keys.box.DisplayRole;
import org.jfree.layouting.input.style.keys.box.Floating;
import org.jfree.layouting.input.style.keys.positioning.Position;
import org.jfree.layouting.input.style.keys.positioning.PositioningStyleKeys;
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.resolver.computed.ConstantsResolveHandler;
public class PositionResolveHandler extends ConstantsResolveHandler
{
public PositionResolveHandler ()
{
addNormalizeValue(Position.ABSOLUTE);
addNormalizeValue(Position.FIXED);
addNormalizeValue(Position.RELATIVE);
addNormalizeValue(Position.STATIC);
setFallback(Position.STATIC);
}
/**
* 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[]{
BoxStyleKeys.DISPLAY_MODEL,
};
}
/**
* Resolves a single property.
*
* @param currentNode
* @param style
*/
public void resolve (final LayoutProcess process,
final LayoutElement currentNode,
final StyleKey key)
{
final LayoutContext layoutContext = currentNode.getLayoutContext();
CSSValue displayModel = layoutContext.getValue(BoxStyleKeys.DISPLAY_MODEL);
if (DisplayRole.NONE.equals(displayModel))
{
// skip ... the element will not be displayed ...
layoutContext.setValue(PositioningStyleKeys.POSITION, Position.STATIC);
return;
}
final CSSValue rawValue = layoutContext.getValue(key);
if (rawValue instanceof CSSFunctionValue)
{
// OK; check for pending ..
CSSFunctionValue function = (CSSFunctionValue) rawValue;
if ("running".equals(function.getFunctionName()))
{
// The element will be inside a block-context (same behaviour as
// for floats)
layoutContext.setValue(BoxStyleKeys.DISPLAY_MODEL, DisplayModel.BLOCK_INSIDE);
layoutContext.setValue(BoxStyleKeys.DISPLAY_ROLE, DisplayRole.BLOCK);
return;
}
layoutContext.setValue(PositioningStyleKeys.POSITION, Position.STATIC);
return;
}
final CSSConstant value = (CSSConstant) resolveValue(process, currentNode, key);
layoutContext.setValue(PositioningStyleKeys.POSITION, value);
if (Position.ABSOLUTE.equals(value) ||
Position.FIXED.equals(value))
{
// http://www.w3.org/TR/REC-CSS2/visuren.html#propdef-float
// this is specified in 9.7: Relationships between 'display',
// 'position', and 'float':
// Quote: Otherwise, 'position' has the value 'absolute' or 'fixed',
// 'display' is set to 'block' and 'float' is set to 'none'. The position
// of the box will be determined by the 'top', 'right', 'bottom' and
// 'left' properties and the box's containing block.
layoutContext.setValue(BoxStyleKeys.DISPLAY_MODEL, DisplayModel.BLOCK_INSIDE);
layoutContext.setValue(BoxStyleKeys.DISPLAY_ROLE, DisplayRole.BLOCK);
layoutContext.setValue(BoxStyleKeys.FLOAT, Floating.NONE);
}
}
}