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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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
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 * accompanied this code).
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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/**
 * 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 {

    
Constructs a new instance of DefaultMenuLayout. 
Params:
target – the container that needs to be laid out
axis – the axis to lay out components along. Can be one of: BoxLayout.X_AXIS, BoxLayout.Y_AXIS, BoxLayout.LINE_AXIS or BoxLayout.PAGE_AXIS/**
     * Constructs a new instance of {@code DefaultMenuLayout}.
     *
     * @param target the container that needs to be laid out
     * @param axis the axis to lay out components along. Can be one of:
     *              {@code BoxLayout.X_AXIS},
     *              {@code BoxLayout.Y_AXIS},
     *              {@code BoxLayout.LINE_AXIS} or
     *              {@code BoxLayout.PAGE_AXIS}
     */
    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);
    }
}