| /* |
| * 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| 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 { |
| |
| /** |
| * 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); |
| } |
| } |