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    1   /*
    2    * Copyright (c) 1998, 2008, 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   import javax.swing;
   29   import javax.swing.plaf.UIResource;
   30   
   31   import java.awt.Container;
   32   import java.awt.Dimension;
   33   
   34   /**
   35    * The default layout manager for Popup menus and menubars.  This
   36    * class is an extension of BoxLayout which adds the UIResource tag
   37    * so that pluggable L&Fs can distinguish it from user-installed
   38    * layout managers on menus.
   39    *
   40    * @author Georges Saab
   41    */
   42   
   43   public class DefaultMenuLayout extends BoxLayout implements UIResource {
   44       public DefaultMenuLayout(Container target, int axis) {
   45           super(target, axis);
   46       }
   47   
   48       public Dimension preferredLayoutSize(Container target) {
   49           if (target instanceof JPopupMenu) {
   50               JPopupMenu popupMenu = (JPopupMenu) target;
   51               sun.swing.MenuItemLayoutHelper.clearUsedClientProperties(popupMenu);
   52               if (popupMenu.getComponentCount() == 0) {
   53                   return new Dimension(0, 0);
   54               }
   55           }
   56   
   57           // Make BoxLayout recalculate cached preferred sizes
   58           super.invalidateLayout(target);
   59   
   60           return super.preferredLayoutSize(target);
   61       }
   62   }

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