/*
 * SimplyHTML, a word processor based on Java, HTML and CSS
 * Copyright (C) 2002 Ulrich Hilger
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package com.lightdev.app.shtm;

import java.awt.Font;
import java.awt.GridLayout;

import javax.swing.ButtonGroup;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.UIManager;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;
import javax.swing.text.AttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.html.CSS;

/**
 * a panel to display and change line attributes
 *
 * @author Ulrich Hilger
 * @author Light Development
 * @author <a href="http://www.lightdev.com">http://www.lightdev.com</a>
 * @author <a href="mailto:info@lightdev.com">info@lightdev.com</a>
 * @author published under the terms and conditions of the
 *      GNU General Public License,
 *      for details see file gpl.txt in the distribution
 *      package of this software
 *
 * 
 */
class EffectPanel extends JPanel implements AttributeComponent {
    /** a radio button for the underline attribute */
    JRadioButton uLine;
    /** a radio button for the strike through attribute */
    JRadioButton strike;
    /** a radio button if no line effect is set */
    JRadioButton noLine;
    private Object originalValue;
    private int setValCount = 0;
    String selection = Util.CSS_ATTRIBUTE_NONE;

    public EffectPanel() {
        super(new GridLayout(3, 1, 3, 3));
        /** initialize the line effects button group */
        noLine = new JRadioButton(Util.getResourceString("noLineLabel"));
        uLine = new JRadioButton(Util.getResourceString("uLineLabel"));
        strike = new JRadioButton(Util.getResourceString("strikeLabel"));
        final ButtonGroup effectGroup = new ButtonGroup();
        effectGroup.add(noLine);
        effectGroup.add(uLine);
        effectGroup.add(strike);
        //JPanel linePanel = new JPanel(new GridLayout(3,1,3,3));
        setBorder(new TitledBorder(new EtchedBorder(EtchedBorder.LOWERED), Util.getResourceString("effectLabel")));
        final Font font = UIManager.getFont("TextField.font");
        uLine.setFont(font);
        strike.setFont(font);
        noLine.setFont(font);
        add(noLine);
        add(uLine);
        add(strike);
    }

    public AttributeSet getValue(final boolean includeUnchanged) {
        if (includeUnchanged) {
            return getAttributes();
        }
        else {
            return getValue();
        }
    }

    private AttributeSet getAttributes() {
        final SimpleAttributeSet set = new SimpleAttributeSet();
        selection = Util.CSS_ATTRIBUTE_NONE;
        if (uLine.isSelected()) {
            selection = Util.CSS_ATTRIBUTE_UNDERLINE;
            StyleConstants.setUnderline(set, true);
        }
        else if (strike.isSelected()) {
            selection = Util.CSS_ATTRIBUTE_LINE_THROUGH;
            StyleConstants.setStrikeThrough(set, true);
        }
        Util.styleSheet().addCSSAttribute(set, CSS.Attribute.TEXT_DECORATION, selection);
        return set;
    }

    public AttributeSet getValue() {
        final AttributeSet set = getAttributes();
        if (((originalValue == null) && (!selection.equalsIgnoreCase(Util.CSS_ATTRIBUTE_NONE)))
                || ((originalValue != null) && (!originalValue.toString().equalsIgnoreCase(selection)))) {
            return set;
        }
        else {
            return new SimpleAttributeSet();
        }
    }

    public boolean setValue(final AttributeSet a) {
        boolean success = false;
        if (a.isDefined(CSS.Attribute.TEXT_DECORATION)) {
            final String value = a.getAttribute(CSS.Attribute.TEXT_DECORATION).toString();
            if (value.equalsIgnoreCase(Util.CSS_ATTRIBUTE_UNDERLINE)) {
                uLine.setSelected(true);
                if (++setValCount < 2) {
                    originalValue = Util.CSS_ATTRIBUTE_UNDERLINE;
                }
                success = true;
            }
            else if (value.equalsIgnoreCase(Util.CSS_ATTRIBUTE_LINE_THROUGH)) {
                strike.setSelected(true);
                if (++setValCount < 2) {
                    originalValue = Util.CSS_ATTRIBUTE_LINE_THROUGH;
                }
                success = true;
            }
            else {
                noLine.setSelected(true);
            }
        }
        else {
            noLine.setSelected(true);
        }
        return success;
    }
}