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 * 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.

 *

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package com.sun.java.swing.plaf.motif;

import javax.swing.*;

import javax.swing.border.*;

import javax.swing.plaf.*;

import javax.swing.plaf.basic.BasicScrollPaneUI;

import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

/**

 * A CDE/Motif L&F implementation of ScrollPaneUI.

 * <p>

 * <strong>Warning:</strong>

 * Serialized objects of this class will not be compatible with

 * future Swing releases.  The current serialization support is appropriate

 * for short term storage or RMI between applications running the same

 * version of Swing.  A future release of Swing will provide support for

 * long term persistence.

 *

 * @author Hans Muller

 */

public class MotifScrollPaneUI extends BasicScrollPaneUI

{

    private final static Border vsbMarginBorderR = new EmptyBorder(0, 4, 0, 0);

    private final static Border vsbMarginBorderL = new EmptyBorder(0, 0, 0, 4);

    private final static Border hsbMarginBorder = new EmptyBorder(4, 0, 0, 0);

    private CompoundBorder vsbBorder;

    private CompoundBorder hsbBorder;

    private PropertyChangeListener propertyChangeHandler;

    protected void installListeners(JScrollPane scrollPane) {

        super.installListeners(scrollPane);

        propertyChangeHandler = createPropertyChangeHandler();

        scrollPane.addPropertyChangeListener(propertyChangeHandler);

    }

        super.uninstallListeners(scrollPane);

        scrollPane.removePropertyChangeListener(propertyChangeHandler);

    }

    private PropertyChangeListener createPropertyChangeHandler() {

        return new PropertyChangeListener() {

            public void propertyChange(PropertyChangeEvent e) {

                  String propertyName = e.getPropertyName();

                  if (propertyName.equals("componentOrientation")) {

                        JScrollPane pane = (JScrollPane)e.getSource();

                        JScrollBar vsb = pane.getVerticalScrollBar();

                        if (vsb != null && vsbBorder != null &&

                            vsb.getBorder() == vsbBorder) {

                            // The Border on the verticall scrollbar matches

                            // what we installed, reset it.

                            if (MotifGraphicsUtils.isLeftToRight(pane)) {

                                vsbBorder = new CompoundBorder(vsbMarginBorderR,

                                                vsbBorder.getInsideBorder());

                            } else {

                                vsbBorder = new CompoundBorder(vsbMarginBorderL,

                                                vsbBorder.getInsideBorder());

                            }

                            vsb.setBorder(vsbBorder);

                        }

                  }

        }};

    }

    protected void installDefaults(JScrollPane scrollpane) {

        super.installDefaults(scrollpane);

        JScrollBar vsb = scrollpane.getVerticalScrollBar();

        if (vsb != null) {

            if (MotifGraphicsUtils.isLeftToRight(scrollpane)) {

                vsbBorder = new CompoundBorder(vsbMarginBorderR,

                                               vsb.getBorder());

            }

            else {

                vsbBorder = new CompoundBorder(vsbMarginBorderL,

                                               vsb.getBorder());

            }

            vsb.setBorder(vsbBorder);

        }

        JScrollBar hsb = scrollpane.getHorizontalScrollBar();

        if (hsb != null) {

            hsbBorder = new CompoundBorder(hsbMarginBorder, hsb.getBorder());

            hsb.setBorder(hsbBorder);

        }

    }

    protected void uninstallDefaults(JScrollPane c) {

        super.uninstallDefaults(c);

        JScrollBar vsb = scrollpane.getVerticalScrollBar();

        if (vsb != null) {

            if (vsb.getBorder() == vsbBorder) {

                vsb.setBorder(null);

            }

            vsbBorder = null;

        }

        JScrollBar hsb = scrollpane.getHorizontalScrollBar();

        if (hsb != null) {

            if (hsb.getBorder() == hsbBorder) {

                hsb.setBorder(null);

            }

            hsbBorder = null;

        }

    }

    public static ComponentUI createUI(JComponent x) {

        return new MotifScrollPaneUI();

    }

}