/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2000 Intersect Software Corporation

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, see http://www.gnu.org
*/

package net.wotonomy.ui.swing.components;

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

import javax.swing.JPanel;

/**
 * A JPanel that renders an image, tiling as necessary to fill the panel. The
 * preferred size of the panel is the size of the image and will change until
 * the image is fully loaded, so using a media tracker is recommended.
 *
 * @author michael@mpowers.net
 * @version $Revision: 904 $
 */
public class ImagePanel extends JPanel implements ImageObserver {
	protected Image image;
	protected int imageWidth, imageHeight;

	public ImagePanel() {
		this(null);
	}

	public ImagePanel(Image anImage) {
		image = anImage;
		if (anImage != null) {
			prepareImage(image, this);
			// these may return -1
			imageWidth = image.getWidth(this);
			imageHeight = image.getHeight(this);
		} else {
			imageWidth = 0;
			imageHeight = 0;
		}
	}

	protected void paintComponent(Graphics g) {
		if ((image != null) && (imageWidth > 0) && (imageHeight > 0)) {
			int width = getWidth();
			int height = getHeight();

			for (int x = 0; x < width; x += imageWidth) {
				for (int y = 0; y < height; y += imageHeight) {
					g.drawImage(image, x, y, imageWidth, imageHeight, getBackground(), this);
				}
			}
		}
	}

	public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
		imageWidth = width;
		imageHeight = height;
		setPreferredSize(new Dimension(width, height));
		revalidate();
		repaint();

		if ((infoflags & ImageObserver.ALLBITS) == ImageObserver.ALLBITS) {
			return false;
		}
		return true;
	}

}