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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 | } | ||