/* * Copyright (c) 1998, 2005, 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 java.awt.*;import javax.swing.*;import javax.swing.border.*;import javax.swing.plaf.*;import java.awt.*;import java.awt.event.*;  /** * BasicPanel implementation * * @author Steve Wilson */public class BasicPanelUI extends PanelUI {     // Shared UI object    private static PanelUI panelUI;     public static ComponentUI createUI(JComponent c) {        if(panelUI == null) {            panelUI = new BasicPanelUI();        }        return panelUI;    }     public void installUI(JComponent c) {        JPanel p = (JPanel)c;        super.installUI(p);        installDefaults(p);    }     public void uninstallUI(JComponent c) {        JPanel p = (JPanel)c;        uninstallDefaults(p);        super.uninstallUI(c);    }     protected void installDefaults(JPanel p) {        LookAndFeel.installColorsAndFont(p,                                         "Panel.background",                                         "Panel.foreground",                                         "Panel.font");        LookAndFeel.installBorder(p,"Panel.border");        LookAndFeel.installProperty(p, "opaque", Boolean.TRUE);    }     protected void uninstallDefaults(JPanel p) {        LookAndFeel.uninstallBorder(p);    }      /**     * Returns the baseline.     *     * @throws NullPointerException {@inheritDoc}     * @throws IllegalArgumentException {@inheritDoc}     * @see javax.swing.JComponent#getBaseline(int, int)     * @since 1.6     */    public int getBaseline(JComponent c, int width, int height) {        super.getBaseline(c, width, height);        Border border = c.getBorder();        if (border instanceof AbstractBorder) {            return ((AbstractBorder)border).getBaseline(c, width, height);        }        return -1;    }     /**     * Returns an enum indicating how the baseline of the component     * changes as the size changes.     *     * @throws NullPointerException {@inheritDoc}     * @see javax.swing.JComponent#getBaseline(int, int)     * @since 1.6     */    public Component.BaselineResizeBehavior getBaselineResizeBehavior(            JComponent c) {        super.getBaselineResizeBehavior(c);        Border border = c.getBorder();        if (border instanceof AbstractBorder) {            return ((AbstractBorder)border).getBaselineResizeBehavior(c);        }        return Component.BaselineResizeBehavior.OTHER;    }}