/*

  * Copyright 2007 - 2009 JEuclid, http://jeuclid.sf.net

  * 

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *      http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 /* $Id: AbstractTokenWithTextLayout.java,v 923658a2b249 2009/09/11 09:57:31 max $ */

 package net.sourceforge.jeuclid.elements.presentation.token;

 import java.awt.Color;

 import java.awt.Graphics2D;

 import java.awt.font.TextLayout;

 import java.text.AttributedCharacterIterator;

 import java.text.AttributedString;

 import java.util.Collections;

 import java.util.List;

 import net.sourceforge.jeuclid.LayoutContext;

 import net.sourceforge.jeuclid.context.Parameter;

 import net.sourceforge.jeuclid.elements.AbstractJEuclidElement;

 import net.sourceforge.jeuclid.elements.support.text.StringUtil;

 import net.sourceforge.jeuclid.layout.LayoutInfo;

 import net.sourceforge.jeuclid.layout.LayoutStage;

 import net.sourceforge.jeuclid.layout.LayoutView;

 import net.sourceforge.jeuclid.layout.LayoutableNode;

 import net.sourceforge.jeuclid.layout.TextObject;

 import org.apache.batik.dom.AbstractDocument;

 import org.w3c.dom.mathml.MathMLPresentationToken;

 /**

  * Common functionality for all tokens based on a text layout.

  * 

  * @version $Revision: 923658a2b249 $

  */

 public abstract class AbstractTokenWithTextLayout extends

         AbstractJEuclidElement implements MathMLPresentationToken {

     private static final long serialVersionUID = 1L;

     /**

      * Default constructor. Sets MathML Namespace.

      * 

      * @param qname

      *            Qualified name.

      * @param odoc

      *            Owner Document.

      */

     public AbstractTokenWithTextLayout(final String qname,

             final AbstractDocument odoc) {

         super(qname, odoc);

     }

     /** {@inheritDoc} */

     @Override

     public void layoutStageInvariant(final LayoutView view,

             final LayoutInfo info, final LayoutStage stage,

             final LayoutContext context) {

         final Graphics2D g = view.getGraphics();

         final TextLayout t = this.produceTextLayout(g, context);

         if (t != null) {

             final StringUtil.TextLayoutInfo tli = StringUtil.getTextLayoutInfo(

                     t, false);

             info.setAscentHeight(tli.getAscent(), stage);

             info.setDescentHeight(tli.getDescent(), stage);

             final float width = tli.getWidth();

             info.setHorizontalCenterOffset(width / 2.0f, stage);

             info.setWidth(width, stage);

             info.setGraphicsObject(new TextObject(t, tli.getOffset(),

                     (Color) this.applyLocalAttributesToContext(context)

                             .getParameter(Parameter.MATHCOLOR)));

         }

     }

     private TextLayout produceTextLayout(final Graphics2D g2d,

             final LayoutContext context) {

         TextLayout layout;

         final LayoutContext now = this.applyLocalAttributesToContext(context);

         final AttributedCharacterIterator aci = StringUtil

                 .textContentAsAttributedCharacterIterator(now, this, this, 1.0f);

         if (aci.getBeginIndex() == aci.getEndIndex()) {

             return null;

         } else {

             layout = StringUtil.createTextLayoutFromAttributedString(g2d,

                     new AttributedString(aci), now);

             return layout;

         }

     }

     /** {@inheritDoc} */

     @Override

     public List<LayoutableNode> getChildrenToLayout() {

         return Collections.emptyList();

     }

     /** {@inheritDoc} */

     @Override

     public List<LayoutableNode> getChildrenToDraw() {

         return Collections.emptyList();

     }

 }