/**
* ===========================================
* 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: BoxShifter.java 6653 2008-12-02 14:53:40Z tmorgner $
* ------------
* (C) Copyright 2006-2007, by Pentaho Corporation.
*/
package org.jfree.layouting.renderer.process;
import org.jfree.layouting.renderer.model.RenderBox;
import org.jfree.layouting.renderer.model.RenderNode;
/**
* By keeping the shifting in a separate class, we can optimize it later without
* having to touch the other code. Remember: Recursive calls can be evil in
* complex documents..
*
* @author Thomas Morgner
*/
public class BoxShifter
{
public BoxShifter()
{
}
public void shiftBox(final RenderBox box, final long amount)
{
if (amount == 0)
{
return;
}
if (amount < 0)
{
throw new IllegalArgumentException("Cannot shift upwards: " + amount);
}
box.setY(box.getY() + amount);
shiftBoxInternal(box, amount);
}
public void shiftBoxUnchecked(final RenderBox box, final long amount)
{
if (amount == 0)
{
return;
}
box.setY(box.getY() + amount);
shiftBoxInternal(box, amount);
}
private void shiftBoxInternal(final RenderBox box, final long amount)
{
RenderNode node = box.getFirstChild();
while (node != null)
{
node.setY(node.getY() + amount);
if (node instanceof RenderBox)
{
shiftBoxInternal((RenderBox) node, amount);
}
node = node.getNext();
}
}
public void extendHeight(final RenderNode node, final long amount)
{
if (amount < 0)
{
throw new IllegalArgumentException("Cannot shrink elements.");
}
if (node == null || amount == 0)
{
return;
}
node.setHeight(node.getHeight() + amount);
RenderBox parent = node.getParent();
while (parent != null)
{
parent.setHeight(parent.getHeight() + amount);
parent = parent.getParent();
}
}
}