//
// $Id: SortArrowIcon.java 95 2007-05-02 03:27:05Z
// /C=DE/ST=Baden-Wuerttemberg/O=ISDN4Linux/OU=Fritz
// Elfert/CN=svn-felfert@isdn4linux.de/emailAddress=fritz@fritz-elfert.de $
//
// jupload - A file upload applet.
// Copyright 2007 The JUpload Team
//
// Created: ?
// Creator: William JinHua Kwong
// Last modified: $Date: 2008-12-03 06:57:11 -0200 (Qua, 03 Dez 2008) $
//
// 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.,
// 675 Mass Ave, Cambridge, MA 02139, USA.

package wjhk.jupload2.gui.filepanel;

import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;

import javax.swing.Icon;

/**
 * Icon implementation, to control and indicate the current sort order, into the
 * {@link wjhk.jupload2.gui.filepanel.FilePanelJTable}.
 */
public class SortArrowIcon implements Icon {
    /**
     * Don't draw an arrow.
     */
    public static final int NONE = 0;

    /**
     * Draw arrow, representing descending sort order.
     */
    public static final int DESCENDING = 1;

    /**
     * Draw arrow, representing ascending sort order.
     */
    public static final int ASCENDING = 2;

    protected int direction;

    protected int width = 8;

    protected int height = 8;

    /**
     * Creates a new instance.
     * 
     * @param direction The desired direction, either {@link #ASCENDING},
     *            {@link #DESCENDING} or {@link #NONE}
     */
    public SortArrowIcon(int direction) {
        this.direction = direction;
    }

    /**
     * @see javax.swing.Icon#getIconWidth()
     */
    public int getIconWidth() {
        return this.width;
    }

    /**
     * @see javax.swing.Icon#getIconHeight()
     */
    public int getIconHeight() {
        return this.height;
    }

    /**
     * @see javax.swing.Icon#paintIcon(java.awt.Component, java.awt.Graphics,
     *      int, int)
     */
    public void paintIcon(Component c, Graphics g, int x, int y) {
        final Color bg = c.getBackground();
        final Color light = bg.brighter().brighter();
        final Color shade = bg.darker().darker();

        final int w = this.width;
        final int h = this.height;
        final int m = w / 2;
        switch (this.direction) {
            case ASCENDING:
                g.setColor(shade);
                g.drawLine(x, y, x + w, y);
                g.drawLine(x, y, x + m, y + h);
                g.setColor(light);
                g.drawLine(x + w, y, x + m, y + h);
                break;
            case DESCENDING:
                g.setColor(shade);
                g.drawLine(x + m, y, x, y + h);
                g.setColor(light);
                g.drawLine(x, y + h, x + w, y + h);
                g.drawLine(x + m, y, x + w, y + h);
                break;
        }
    }
}