Lowest level area container for column support

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@193891 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/src/org/apache/fop/layout/ColumnArea.java b/src/org/apache/fop/layout/ColumnArea.java
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+++ b/src/org/apache/fop/layout/ColumnArea.java
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+/*-- $Id$ -- 
+
+ ============================================================================
+                   The Apache Software License, Version 1.1
+ ============================================================================
+ 
+    Copyright (C) 1999 The Apache Software Foundation. All rights reserved.
+ 
+ Redistribution and use in source and binary forms, with or without modifica-
+ tion, are permitted provided that the following conditions are met:
+ 
+ 1. Redistributions of  source code must  retain the above copyright  notice,
+    this list of conditions and the following disclaimer.
+ 
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions and the following disclaimer in the documentation
+    and/or other materials provided with the distribution.
+ 
+ 3. The end-user documentation included with the redistribution, if any, must
+    include  the following  acknowledgment:  "This product includes  software
+    developed  by the  Apache Software Foundation  (http://www.apache.org/)."
+    Alternately, this  acknowledgment may  appear in the software itself,  if
+    and wherever such third-party acknowledgments normally appear.
+ 
+ 4. The names "Fop" and  "Apache Software Foundation"  must not be used to
+    endorse  or promote  products derived  from this  software without  prior
+    written permission. For written permission, please contact
+    apache@apache.org.
+ 
+ 5. Products  derived from this software may not  be called "Apache", nor may
+    "Apache" appear  in their name,  without prior written permission  of the
+    Apache Software Foundation.
+ 
+ THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
+ INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ FITNESS  FOR A PARTICULAR  PURPOSE ARE  DISCLAIMED.  IN NO  EVENT SHALL  THE
+ APACHE SOFTWARE  FOUNDATION  OR ITS CONTRIBUTORS  BE LIABLE FOR  ANY DIRECT,
+ INDIRECT, INCIDENTAL, SPECIAL,  EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLU-
+ DING, BUT NOT LIMITED TO, PROCUREMENT  OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ OF USE, DATA, OR  PROFITS; OR BUSINESS  INTERRUPTION)  HOWEVER CAUSED AND ON
+ ANY  THEORY OF LIABILITY,  WHETHER  IN CONTRACT,  STRICT LIABILITY,  OR TORT
+ (INCLUDING  NEGLIGENCE OR  OTHERWISE) ARISING IN  ANY WAY OUT OF THE  USE OF
+ THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ 
+ This software  consists of voluntary contributions made  by many individuals
+ on  behalf of the Apache Software  Foundation and was  originally created by
+ James Tauber <jtauber@jtauber.com>. For more  information on the Apache 
+ Software Foundation, please see <http://www.apache.org/>.
+ 
+ */
+package org.apache.fop.layout;
+
+// FOP
+import org.apache.fop.render.Renderer;
+import org.apache.fop.fo.properties.Position;
+import org.apache.fop.datatypes.IDReferences;
+
+// Java
+import java.util.Vector;
+import java.util.Enumeration;
+
+public class ColumnArea extends AreaContainer {
+       
+       private int columnIndex;
+       private int maxColumns;
+       
+    public ColumnArea(FontState fontState, int xPosition, int yPosition,
+               int allocationWidth, int maxHeight, int columnCount) {
+               super(fontState, xPosition, yPosition, allocationWidth,
+                       maxHeight, Position.ABSOLUTE);
+               this.maxColumns = columnCount;
+    }
+
+    public void render(Renderer renderer) {
+       renderer.renderAreaContainer(this);
+    }
+
+    public void end() {
+    }
+
+    public void start() {
+    }
+
+    public int spaceLeft() {
+       return maxHeight - currentHeight;
+    }
+       
+       public int getColumnIndex()
+       {
+               return columnIndex;
+       }
+       
+       public void setColumnIndex(int columnIndex)
+       {
+               this.columnIndex = columnIndex;
+       }
+       
+       public void incrementSpanIndex()
+       {
+               SpanArea span = (SpanArea)this.parent;
+               span.setCurrentColumn(span.getCurrentColumn()+1);
+       }
+}