/*
 * Jalview - A Sequence Alignment Editor and Viewer
 * Copyright (C) 2006 AM Waterhouse, J Procter, G Barton, M Clamp, S Searle
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */
package jalview.gui;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;


/**
 * DOCUMENT ME!
 *
 * @author $author$
 * @version $Revision$
 */
public class IdwidthAdjuster extends JPanel implements MouseListener,
    MouseMotionListener
{
    boolean active = false;
    int oldX = 0;
    Image image;
    AlignmentPanel ap;

    /**
     * Creates a new IdwidthAdjuster object.
     *
     * @param ap DOCUMENT ME!
     */
    public IdwidthAdjuster(AlignmentPanel ap)
    {
        this.ap = ap;

        java.net.URL url = getClass().getResource("/images/idwidth.gif");

        if (url != null)
        {
            image = java.awt.Toolkit.getDefaultToolkit().createImage(url);
        }

        addMouseListener(this);
        addMouseMotionListener(this);
    }

    /**
     * DOCUMENT ME!
     *
     * @param evt DOCUMENT ME!
     */
    public void mousePressed(MouseEvent evt)
    {
        oldX = evt.getX();
    }

    /**
     * DOCUMENT ME!
     *
     * @param evt DOCUMENT ME!
     */
    public void mouseReleased(MouseEvent evt)
    {
        active = false;
        repaint();
    }

    /**
     * DOCUMENT ME!
     *
     * @param evt DOCUMENT ME!
     */
    public void mouseEntered(MouseEvent evt)
    {
        active = true;
        repaint();
    }

    /**
     * DOCUMENT ME!
     *
     * @param evt DOCUMENT ME!
     */
    public void mouseExited(MouseEvent evt)
    {
        active = false;
        repaint();
    }

    /**
     * DOCUMENT ME!
     *
     * @param evt DOCUMENT ME!
     */
    public void mouseDragged(MouseEvent evt)
    {
        active = true;

        Dimension d = ap.idPanel.idCanvas.getPreferredSize();
        int dif = evt.getX() - oldX;

        if (((d.width + dif) > 20) || (dif > 0))
        {
            ap.idPanel.idCanvas.setPreferredSize(new Dimension(d.width + dif,
                    d.height));
            ap.repaint();
        }

        oldX = evt.getX();
    }

    /**
     * DOCUMENT ME!
     *
     * @param evt DOCUMENT ME!
     */
    public void mouseMoved(MouseEvent evt)
    {
    }

    /**
     * DOCUMENT ME!
     *
     * @param evt DOCUMENT ME!
     */
    public void mouseClicked(MouseEvent evt)
    {
    }

    /**
     * DOCUMENT ME!
     *
     * @param g DOCUMENT ME!
     */
    public void paintComponent(Graphics g)
    {
        g.setColor(Color.white);
        g.fillRect(0, 0, getWidth(), getHeight());

        if (active)
        {
            if (image != null)
            {
                g.drawImage(image, getWidth() - 20, 2, this);
            }
        }
    }
}