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The JGoodies Looks make your Swing applications and applets look better. They have been optimized for readability, precise micro-design and usability. And they simplify the multi-platform support by using similar widget dimensions. In addition, many people have reviewed them as elegant.

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/*
 * Copyright (c) 2001-2012 JGoodies Karsten Lentzsch. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  o Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  o Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 *  o Neither the name of JGoodies Karsten Lentzsch nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.jgoodies.looks.plastic;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.JComponent;
import javax.swing.JScrollPane;
import javax.swing.LookAndFeel;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.metal.MetalScrollPaneUI;

import com.jgoodies.looks.Options;

/**
 * The JGoodies Plastic L&Fl implementation of {@code ScrollPaneUI}.
 * Installs an etched border if the client property
 * {@code Options.IS_ETCHED_KEY} is set.
 *
 * @author Karsten Lentzsch
 * @version $Revision: 1.9 $
 *
 * @see com.jgoodies.looks.Options#IS_ETCHED_KEY
 */
public final class PlasticScrollPaneUI extends MetalScrollPaneUI {

    /**
     * Holds the listener that handles changes in the etched border property.
     */
    private PropertyChangeListener borderStyleChangeHandler;

    public static ComponentUI createUI(JComponent b) {
        return new PlasticScrollPaneUI();
    }

    @Override
    protected void installDefaults(JScrollPane scrollPane) {
        super.installDefaults(scrollPane);
        installEtchedBorder(scrollPane);
    }


    // Managing the Etched Property *******************************************

    @Override
    public void installListeners(JScrollPane scrollPane) {
        super.installListeners(scrollPane);
        borderStyleChangeHandler = new BorderStyleChangeHandler();
        scrollPane.addPropertyChangeListener(Options.IS_ETCHED_KEY, borderStyleChangeHandler);
    }

    @Override
    protected void uninstallListeners(JComponent c) {
        ((JScrollPane) c).removePropertyChangeListener(Options.IS_ETCHED_KEY,
                borderStyleChangeHandler);
        super.uninstallListeners(c);
    }

    private static void installEtchedBorder(JScrollPane scrollPane) {
        Object value = scrollPane.getClientProperty(Options.IS_ETCHED_KEY);
        boolean hasEtchedBorder = Boolean.TRUE.equals(value);
        LookAndFeel.installBorder(scrollPane,
                hasEtchedBorder
                    ? "ScrollPane.etchedBorder"
                    : "ScrollPane.border");
    }

    private class BorderStyleChangeHandler implements PropertyChangeListener {

        @Override
		public void propertyChange(PropertyChangeEvent evt) {
            JScrollPane scrollPane = (JScrollPane) evt.getSource();
            installEtchedBorder(scrollPane);
        }

    }

}