/* dIntProg Browser. A webbrowser written in Java.
 * Copyright (C) 2001 Martin Geisler <gimpster@gimpster.com>
 * 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
 * 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.

import java.awt.*;
import javax.swing.*;

/** Adaptor class that implements {@link Box} by supplying reasonable
 * default for most of the methods. */
public abstract class AbstractBox implements Box {

    /** The width of the box, defaults to <code>-1</code>. */
    protected int width = -1;
    /** The height of the box, defaults to <code>-1</code>. */    
    protected int height = -1;
    /** The minimum width of this box, defaults to <code>-1</code>. */
    protected int min_width = -1;
    /** The preferred width of the box, defaults to <code>-1</code>.
     * The preferred width is used when someone needs to get an
     * indication of the size of a box. */
    protected int pref_width = -1;

    public int getWidth() {
        return width;

    public int getMinimumWidth() {
        return min_width;

    public int getPreferredWidth() {
        return pref_width;

    public int getHeight() {
        return height;

    public abstract void doLayout(Graphics g, JComponent c, int w);

    public abstract void drawAt(int x, int y, DocumentView v);

    /** Returns a representation of the box. The string contains the
     * widht, height, and class-name of the box. It is only meant to
     * be used when debugging.
     * @return information about the box. */
    public String toString() {
        return "" + width + "x" + height + " box: " + this.getClass().getName();