content: /* ========================================================================
   * JCommon : a free general purpose class library for the Java(tm) platform
   * ========================================================================
   *
   * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
   * 
   * Project Info:  http://www.jfree.org/jcommon/index.html
   *
   * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
   * USA.  
   *
   * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
   * in the United States and other countries.]
   * 
   * -----------------
   * CenterLayout.java
   * -----------------
   * (C) Copyright 2000-2005, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   -;
   *
   * $Id: CenterLayout.java,v 1.6 2005/11/16 15:58:40 taqua Exp $
   *
   * Changes (from 5-Nov-2001)
   * -------------------------
   * 05-Nov-2001 : Changed package to com.jrefinery.layout.* (DG);
   * 10-Oct-2002 : Fixed errors reported by Checkstyle (DG);
   *
   */
  
  package org.jfree.layout;
  
  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
      }
  
  }
  