/*
* Copyright (c) 1998, 2008, 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.
*
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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 plauggable L&Fs can distinguish it from user-installed
* layout managers on menus.
*
* @author Georges Saab
*/
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);
}
}