/*

 * Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package javax.swing.plaf.basic;

import javax.swing.*;

import javax.swing.plaf.UIResource;

import java.awt.Container;

import java.awt.Dimension;

/**

 * The default layout manager for Popup menus and menubars.  This

 * class is an extension of BoxLayout which adds the UIResource tag

 * so that pluggable L&Fs can distinguish it from user-installed

 * layout managers on menus.

 *

 * @author Georges Saab

 */

@SuppressWarnings("serial") // Superclass is not serializable across versions

public class DefaultMenuLayout extends BoxLayout implements UIResource {

    public DefaultMenuLayout(Container target, int axis) {

        super(target, axis);

    }

    public Dimension preferredLayoutSize(Container target) {

        if (target instanceof JPopupMenu) {

            JPopupMenu popupMenu = (JPopupMenu) target;

            sun.swing.MenuItemLayoutHelper.clearUsedClientProperties(popupMenu);

            if (popupMenu.getComponentCount() == 0) {

                return new Dimension(0, 0);

            }

        }

        // Make BoxLayout recalculate cached preferred sizes

        super.invalidateLayout(target);

        return super.preferredLayoutSize(target);

    }

}