/*
    GNU GENERAL PUBLIC LICENSE
    Copyright (C) 2006 The Lobo Project

    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
    verion 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 library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Contact info: lobochief@users.sourceforge.net
 */

package org.lobobrowser.primary.clientlets.img;

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.image.ImageObserver;

import javax.swing.JComponent;
import javax.swing.Scrollable;
import javax.swing.SwingConstants;

public class ImageScrollable extends JComponent implements Scrollable {
  private static final long serialVersionUID = 5025159268512978417L;
  private final Image image;
  private int imageWidth = -1;
  private int imageHeight = -1;

  public ImageScrollable(final Image img) {
    super();
    this.image = img;
    final int w = img.getWidth(this);
    final int h = img.getHeight(this);
    this.imageWidth = w;
    this.imageHeight = h;
  }

  @Override
  public boolean imageUpdate(final Image img, final int infoflags, final int x, final int y, final int w, final int h) {
    if (((infoflags & ImageObserver.ALLBITS) != 0) || ((infoflags & ImageObserver.FRAMEBITS) != 0)) {
      this.imageWidth = img.getWidth(this);
      this.imageHeight = img.getHeight(this);
      this.revalidate();
      this.repaint();
    }
    return true;
  }

  @Override
  public void paintComponent(final Graphics g) {
    super.paintComponent(g);
    final Insets insets = this.getInsets();
    g.drawImage(this.image, insets.left, insets.top, this);
  }

  @Override
  public Dimension getPreferredSize() {
    final int w = this.imageWidth;
    final int h = this.imageHeight;
    return new Dimension(w == -1 ? 0 : w, h == -1 ? 0 : h);
  }

  public Dimension getPreferredScrollableViewportSize() {
    return this.getPreferredSize();
  }

  public int getScrollableUnitIncrement(final Rectangle arg0, final int arg1, final int arg2) {
    return 12;
  }

  public int getScrollableBlockIncrement(final Rectangle arg0, final int orientation, final int direction) {
    if (orientation == SwingConstants.HORIZONTAL) {
      return arg0.width;
    } else {
      return arg0.height;
    }
  }

  public boolean getScrollableTracksViewportWidth() {
    return false;
  }

  public boolean getScrollableTracksViewportHeight() {
    return false;
  }
}