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    1   /*
    2    * Copyright (c) 1998, 2003, Oracle and/or its affiliates. All rights reserved.
    3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
    4    *
    5    * This code is free software; you can redistribute it and/or modify it
    6    * under the terms of the GNU General Public License version 2 only, as
    7    * published by the Free Software Foundation.  Oracle designates this
    8    * particular file as subject to the "Classpath" exception as provided
    9    * by Oracle in the LICENSE file that accompanied this code.
   10    *
   11    * This code is distributed in the hope that it will be useful, but WITHOUT
   12    * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   13    * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   14    * version 2 for more details (a copy is included in the LICENSE file that
   15    * accompanied this code).
   16    *
   17    * You should have received a copy of the GNU General Public License version
   18    * 2 along with this work; if not, write to the Free Software Foundation,
   19    * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   20    *
   21    * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   22    * or visit www.oracle.com if you need additional information or have any
   23    * questions.
   24    */
   25   
   26   package javax.swing.plaf.basic;
   27   
   28   
   29   import java.awt;
   30   import java.io;
   31   
   32   /**
   33     * Center-positioning layout manager.
   34     * @author Tom Santos
   35     * @author Steve Wilson
   36     */
   37   class CenterLayout implements LayoutManager, Serializable {
   38       public void addLayoutComponent(String name, Component comp) { }
   39       public void removeLayoutComponent(Component comp) { }
   40   
   41       public Dimension preferredLayoutSize( Container container ) {
   42           Component c = container.getComponent( 0 );
   43           if ( c != null ) {
   44               Dimension size = c.getPreferredSize();
   45               Insets insets = container.getInsets();
   46   
   47               return new Dimension(size.width + insets.left + insets.right,
   48                                    size.height + insets.top + insets.bottom);
   49           }
   50           else {
   51               return new Dimension( 0, 0 );
   52           }
   53       }
   54   
   55       public Dimension minimumLayoutSize(Container cont) {
   56           return preferredLayoutSize(cont);
   57       }
   58   
   59       public void layoutContainer(Container container) {
   60           if (container.getComponentCount() > 0) {
   61               Component c = container.getComponent(0);
   62               Dimension pref = c.getPreferredSize();
   63               int containerWidth = container.getWidth();
   64               int containerHeight = container.getHeight();
   65               Insets containerInsets = container.getInsets();
   66   
   67               containerWidth -= containerInsets.left +
   68                                 containerInsets.right;
   69               containerHeight -= containerInsets.top +
   70                                  containerInsets.bottom;
   71   
   72               int left = (containerWidth - pref.width) / 2 +
   73                               containerInsets.left;
   74               int right = (containerHeight - pref.height) / 2 +
   75                               containerInsets.top;
   76   
   77               c.setBounds(left, right, pref.width, pref.height);
   78           }
   79       }
   80   }

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