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74 lines
2.7 KiB
Java
74 lines
2.7 KiB
Java
/*
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* Copyright (c) 1998, 2014, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.swing.plaf.basic;
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import javax.swing.*;
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import javax.swing.plaf.UIResource;
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import java.awt.Container;
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import java.awt.Dimension;
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/**
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* The default layout manager for Popup menus and menubars. This
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* class is an extension of BoxLayout which adds the UIResource tag
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* so that pluggable L&Fs can distinguish it from user-installed
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* layout managers on menus.
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*
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* @author Georges Saab
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*/
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@SuppressWarnings("serial") // Superclass is not serializable across versions
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public class DefaultMenuLayout extends BoxLayout implements UIResource {
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/**
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* Constructs a new instance of {@code DefaultMenuLayout}.
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*
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* @param target the container that needs to be laid out
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* @param axis the axis to lay out components along. Can be one of:
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* {@code BoxLayout.X_AXIS},
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* {@code BoxLayout.Y_AXIS},
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* {@code BoxLayout.LINE_AXIS} or
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* {@code BoxLayout.PAGE_AXIS}
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*/
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public DefaultMenuLayout(Container target, int axis) {
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super(target, axis);
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}
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public Dimension preferredLayoutSize(Container target) {
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if (target instanceof JPopupMenu) {
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JPopupMenu popupMenu = (JPopupMenu) target;
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sun.swing.MenuItemLayoutHelper.clearUsedClientProperties(popupMenu);
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if (popupMenu.getComponentCount() == 0) {
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return new Dimension(0, 0);
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}
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}
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// Make BoxLayout recalculate cached preferred sizes
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super.invalidateLayout(target);
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return super.preferredLayoutSize(target);
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}
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}
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