swingx-master/swingx-core/src/main/java/org/jdesktop/swingx/plaf/basic/TextCrossingPainter.java
/*
 * $Id$
 *
 * Copyright 2008 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.jdesktop.swingx.plaf.basic;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Rectangle;

import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;

import org.jdesktop.swingx.painter.AbstractPainter;

/**
 * Painter used to cross-out unselectable dates.
 * 
 * PENDING JW: subclass (or maybe even use?) one of the painter subclasses. 
 * 
 * @author Jeanette Winzenburg
 */
class TextCrossingPainter<T extends JComponent> extends AbstractPainter<T> {
    Rectangle paintIconR = new Rectangle();
    Rectangle paintViewR = new Rectangle();
    Rectangle paintTextR = new Rectangle();
    Insets insetss = new Insets(0, 0, 0, 0);
    Color crossColor;
    /**
     * {@inheritDoc} <p>
     * 
     *  Paints a diagonal cross over the text if the comp is of type JLabel, 
     *  does nothing otherwise.
     */
    @Override
    protected void doPaint(Graphics2D g, JComponent comp, int width,
            int height) {
        if (!(comp instanceof JLabel)) return;
        JLabel label = (JLabel) comp;
        Insets insets = label.getInsets(insetss);
        paintViewR.x = insets.left;
        paintViewR.y = insets.top;
        paintViewR.width = width - (insets.left + insets.right);
        paintViewR.height = height - (insets.top + insets.bottom);
        paintIconR.x = paintIconR.y = paintIconR.width = paintIconR.height = 0;
        paintTextR.x = paintTextR.y = paintTextR.width = paintTextR.height = 0;
        SwingUtilities.layoutCompoundLabel(label, 
                label.getFontMetrics(label.getFont()), label.getText(), null,
                label.getVerticalAlignment(), label.getHorizontalAlignment(), 
                label.getVerticalTextPosition(), label.getHorizontalTextPosition(),
                paintViewR, paintIconR, paintTextR, label.getIconTextGap());
        doPaint(g, paintTextR);
    }
    
    private void doPaint(Graphics2D g, Rectangle r) {
        Color old = g.getColor();
        g.setColor(getForeground());
        g.drawLine(r.x, r.y, r.x + r.width, r.y + r.height);
        g.drawLine(r.x + 1, r.y, r.x + r.width + 1, r.y + r.height);
        g.drawLine(r.x + r.width, r.y, r.x, r.y + r.height);
        g.drawLine(r.x + r.width - 1, r.y, r.x - 1, r.y + r.height);
        g.setColor(old);
        
    }

    /**
     * 
     * @param crossColor the color to paint the cross with
     */
    public void setForeground(Color crossColor) {
        Color old = getForeground();
        this.crossColor = crossColor;
        firePropertyChange("foreground", old, getForeground());
    }

    /**
     * Returns the color to use for painting the cross.
     * 
     * @return the color used for painting.
     */
    public Color getForeground() {
        return crossColor;
    }
}