/*
 * @(#)MotifScrollPaneUI.java	1.14 00/02/02
 *
 * Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */

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

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.plaf.*;
import javax.swing.plaf.basic.BasicScrollPaneUI;


/**
 * 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.
 *
 * @version 1.10 08/28/98
 * @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 Border vsbBorder;
    private Border hsbBorder;


    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();
    }
}