001    /**
002     * Java Gui Builder - A library to build GUIs using an XML file.
003     * Copyright 2002, 2003 (C) François Beausoleil
004     *
005     * This library is free software; you can redistribute it and/or
006     * modify it under the terms of the GNU Lesser General Public
007     * License as published by the Free Software Foundation; either
008     * version 2.1 of the License, or (at your option) any later version.
009     *
010     * This library is distributed in the hope that it will be useful,
011     * but WITHOUT ANY WARRANTY; without even the implied warranty of
012     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
013     * Lesser General Public License for more details.
014     *
015     * You should have received a copy of the GNU Lesser General Public
016     * License along with this library; if not, write to the Free Software
017     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
018     */
019    
020    package jgb.handlers.swing;
021    
022    import org.xml.sax.SAXException;
023    
024    import javax.swing.*;
025    import java.awt.*;
026    import java.util.Map;
027    
028    /**
029     * @since v0.3.1a
030     * @author Francois Beausoleil, <a href="mailto:fbos@users.sourceforge.net">fbos@users.sourceforge.net</a>
031     */
032    public class StrutTagHandler extends AbstractControlTagHandler {
033        /**
034         * The name of the width attribute.
035         */
036        protected static final String ATTR_WIDTH = "width";
037    
038        /**
039         * The name of the height attribute.
040         */
041        protected static final String ATTR_HEIGHT = "height";
042    
043        protected void enterElement(Map atts) throws SAXException {
044            String widthString = (String)atts.get(ATTR_WIDTH);
045            String heightString = (String)atts.get(ATTR_HEIGHT);
046    
047            Component comp = null;
048    
049            if (widthString == null && heightString == null) {
050                Exception cause = new IllegalArgumentException("One of width or " +
051                        "height must be mentionned on strut elements.");
052                throwParsingException(cause);
053            } else if (widthString != null && heightString == null) {
054                int width = new Integer(widthString).intValue();
055                comp = Box.createHorizontalStrut(width);
056            } else if (widthString == null) {
057                int height = new Integer(heightString).intValue();
058                comp = Box.createVerticalStrut(height);
059            } else {
060                int width = new Integer(widthString).intValue();
061                int height = new Integer(heightString).intValue();
062                comp = Box.createRigidArea(new Dimension(width, height));
063            }
064    
065            pushCurrentControl(comp);
066        }
067    
068        protected void exitElement() throws SAXException {
069            popCurrentControl();
070        }
071    
072        protected String getDefaultPackagePrefix() {
073            throw new IllegalStateException();
074        }
075    }