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/* ImageObserver.java -- Java interface for asynchronous updates to an image
Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of the non-peer AWT libraries of GNU Classpath.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published
by the Free Software Foundation, either version 2 of the License, or
(at your option) any later verion.
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 Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; if not, write to the Free Software Foundation
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 USA. */
package java.awt.image;
import java.awt.Image;
/**
* An object implementing the <code>ImageObserver</code> interface can
* receive updates on image construction from an
* <code>ImageProducer</code> asynchronously.
*
* @see ImageProducer
* @author C. Brian Jones (cbj@gnu.org)
*/
public interface ImageObserver
{
/**
* The width of the image has been provided as the
* <code>width</code> argument to <code>imageUpdate</code>.
*
* @see #imageUpdate
*/
public static final int WIDTH = 1;
/**
* The height of the image has been provided as the
* <code>height</code> argument to <code>imageUpdate</code>.
*
* @see #imageUpdate
*/
public static final int HEIGHT = 2;
/**
* The properties of the image have been provided.
*
* @see #imageUpdate
* @see java.awt.Image#getProperty (java.lang.String, java.awt.image.ImageObserver)
*/
public static final int PROPERTIES = 4;
/**
* More pixels are now available for drawing a scaled variation of
* the image.
*
* @see #imageUpdate
*/
public static final int SOMEBITS = 8;
/**
* All the pixels needed to draw a complete frame of a multi-frame
* image are available.
*
* @see #imageUpdate
*/
public static final int FRAMEBITS = 16;
/**
* An image with a single frame, a static image, is complete.
*
* @see #imageUpdate
*/
public static final int ALLBITS = 32;
/**
* An error was encountered while producing the image.
*
* @see #imageUpdate
*/
public static final int ERROR = 64;
/**
* Production of the image was aborted.
*
* @see #imageUpdate
*/
public static final int ABORT = 128;
/**
* This is a callback method for an asynchronous image producer to
* provide updates on the production of the image as it happens.
*
* @param image the image the update refers to
* @param flags a bit mask indicating what is provided with this update
* @param x the x coordinate of the image
* @param y the y coordinate of the image
* @param width the width of the image
* @param height the height of the image
*
* @see java.awt.Image
*/
public abstract boolean imageUpdate(Image image, int flags, int x,
int y, int width, int height);
}
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