/*
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2001 - 2009 Object Refinery Ltd, Pentaho Corporation and Contributors.. All rights reserved.
*/
package org.pentaho.reporting.engine.classic.core.modules.gui.commonswing;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.io.Serializable;
/**
* A layout manager that displays a single component in the center of its container.
*
* @author David Gilbert
*/
public class CenterLayout implements LayoutManager, Serializable
{
/**
* For serialization.
*/
private static final long serialVersionUID = 469319532333015042L;
/**
* Creates a new layout manager.
*/
public CenterLayout()
{
}
/**
* Returns the preferred size.
*
* @param parent the parent.
* @return the preferred size.
*/
public Dimension preferredLayoutSize(final Container parent)
{
synchronized (parent.getTreeLock())
{
final Insets insets = parent.getInsets();
if (parent.getComponentCount() > 0)
{
final Component component = parent.getComponent(0);
final Dimension d = component.getPreferredSize();
return new Dimension(
(int) d.getWidth() + insets.left + insets.right,
(int) d.getHeight() + insets.top + insets.bottom
);
}
else
{
return new Dimension(
insets.left + insets.right, insets.top + insets.bottom
);
}
}
}
/**
* Returns the minimum size.
*
* @param parent the parent.
* @return the minimum size.
*/
public Dimension minimumLayoutSize(final Container parent)
{
synchronized (parent.getTreeLock())
{
final Insets insets = parent.getInsets();
if (parent.getComponentCount() > 0)
{
final Component component = parent.getComponent(0);
final Dimension d = component.getMinimumSize();
return new Dimension(d.width + insets.left + insets.right,
d.height + insets.top + insets.bottom);
}
else
{
return new Dimension(insets.left + insets.right,
insets.top + insets.bottom);
}
}
}
/**
* Lays out the components.
*
* @param parent the parent.
*/
public void layoutContainer(final Container parent)
{
synchronized (parent.getTreeLock())
{
if (parent.getComponentCount() > 0)
{
final Insets insets = parent.getInsets();
final Dimension parentSize = parent.getSize();
final Component component = parent.getComponent(0);
final Dimension componentSize = component.getPreferredSize();
final int xx = insets.left + (
Math.max((parentSize.width - insets.left - insets.right
- componentSize.width) / 2, 0)
);
final int yy = insets.top + (
Math.max((parentSize.height - insets.top - insets.bottom
- componentSize.height) / 2, 0));
component.setBounds(xx, yy, componentSize.width,
componentSize.height);
}
}
}
/**
* Not used.
*
* @param comp the component.
*/
public void addLayoutComponent(final Component comp)
{
// not used.
}
/**
* Not used.
*
* @param comp the component.
*/
public void removeLayoutComponent(final Component comp)
{
// not used
}
/**
* Not used.
*
* @param name the component name.
* @param comp the component.
*/
public void addLayoutComponent(final String name, final Component comp)
{
// not used
}
/**
* Not used.
*
* @param name the component name.
* @param comp the component.
*/
public void removeLayoutComponent(final String name, final Component comp)
{
// not used
}
}