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/**
* ===========================================
* 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: IterateVisualProcessStep.java 3524 2007-10-16 11:26:31Z tmorgner $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.renderer.process;
import org.jfree.layouting.renderer.model.BlockRenderBox;
import org.jfree.layouting.renderer.model.InlineRenderBox;
import org.jfree.layouting.renderer.model.NormalFlowRenderBox;
import org.jfree.layouting.renderer.model.ParagraphRenderBox;
import org.jfree.layouting.renderer.model.RenderBox;
import org.jfree.layouting.renderer.model.RenderNode;
import org.jfree.layouting.renderer.model.page.LogicalPageBox;
/**
* Iterates over the tree of nodes and classifies nodes by their Display-Model.
* The Display-Model of nodes is either 'Block' or 'Inline'. All steps dealing
* with element placement commonly use this strategy.
*
*
* @author Thomas Morgner
*/
public abstract class IterateVisualProcessStep
{
protected IterateVisualProcessStep()
{
}
protected final void startProcessing (final RenderNode node)
{
final RenderBox parent = node.getParent();
if (parent == null || parent instanceof BlockRenderBox)
{
processBlockLevelChild(node);
}
else if (parent instanceof InlineRenderBox)
{
processInlineLevelChild(node);
}
else
{
processOtherLevelChild(node);
}
}
protected void processOtherLevelChild (final RenderNode node)
{
// we do not even handle that one. Other level elements are
// always non-visual!
}
protected void processInlineLevelNode (final RenderNode node)
{
}
protected boolean startInlineLevelBox (final RenderBox box)
{
return true;
}
protected void finishInlineLevelBox (final RenderBox box)
{
}
protected void processInlineLevelChild (final RenderNode node)
{
if (node instanceof ParagraphRenderBox)
{
final ParagraphRenderBox box = (ParagraphRenderBox) node;
if (startInlineLevelBox(box))
{
processParagraphChilds(box);
}
finishInlineLevelBox(box);
}
else if (node instanceof RenderBox)
{
final RenderBox box = (RenderBox) node;
if (startInlineLevelBox(box))
{
processBoxChilds(box);
}
finishInlineLevelBox(box);
}
else
{
processInlineLevelNode(node);
}
}
protected void processBlockLevelNode (final RenderNode node)
{
}
protected boolean startBlockLevelBox (final RenderBox box)
{
return true;
}
protected void finishBlockLevelBox (final RenderBox box)
{
}
protected void processBlockLevelChild (final RenderNode node)
{
if (node instanceof LogicalPageBox)
{
final LogicalPageBox box = (LogicalPageBox) node;
if (startBlockLevelBox(box))
{
startProcessing(box.getHeaderArea());
processBoxChilds(box);
startProcessing(box.getFooterArea());
}
finishBlockLevelBox(box);
}
else if (node instanceof NormalFlowRenderBox)
{
final NormalFlowRenderBox box = (NormalFlowRenderBox) node;
final NormalFlowRenderBox[] flows = box.getFlows();
for (int i = 0; i < flows.length; i++)
{
final NormalFlowRenderBox flow = flows[i];
processFlow(flow);
}
processFlow(box);
}
else if (node instanceof ParagraphRenderBox)
{
final ParagraphRenderBox box = (ParagraphRenderBox) node;
if (startBlockLevelBox(box))
{
processParagraphChilds(box);
}
finishBlockLevelBox(box);
}
else if (node instanceof RenderBox)
{
final RenderBox box = (RenderBox) node;
if (startBlockLevelBox(box))
{
processBoxChilds(box);
}
finishBlockLevelBox(box);
}
else
{
processBlockLevelNode(node);
}
}
protected void processFlow(final NormalFlowRenderBox flow)
{
if (startBlockLevelBox(flow))
{
processBoxChilds(flow);
}
finishBlockLevelBox(flow);
}
protected abstract void processParagraphChilds(final ParagraphRenderBox box);
protected void processBoxChilds(final RenderBox box)
{
RenderNode node = box.getFirstChild();
while (node != null)
{
startProcessing(node);
node = node.getNext();
}
}
}
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