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jeremybenn |
/* ImageObserver.java -- Java interface for asynchronous updates to an image
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Copyright (C) 1999 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.image;
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import java.awt.Image;
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/**
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* An object implementing the <code>ImageObserver</code> interface can
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* receive updates on image construction from an
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* <code>ImageProducer</code> asynchronously.
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*
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* @see ImageProducer
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* @author C. Brian Jones (cbj@gnu.org)
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*/
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public interface ImageObserver
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{
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/**
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* The width of the image has been provided as the
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* <code>width</code> argument to <code>imageUpdate</code>.
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*
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* @see #imageUpdate
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*/
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int WIDTH = 1;
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/**
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* The height of the image has been provided as the
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* <code>height</code> argument to <code>imageUpdate</code>.
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*
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* @see #imageUpdate
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*/
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int HEIGHT = 2;
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/**
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* The properties of the image have been provided.
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*
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* @see #imageUpdate
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* @see java.awt.Image#getProperty (java.lang.String, java.awt.image.ImageObserver)
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*/
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int PROPERTIES = 4;
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/**
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* More pixels are now available for drawing a scaled variation of
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* the image.
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*
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* @see #imageUpdate
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*/
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int SOMEBITS = 8;
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/**
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* All the pixels needed to draw a complete frame of a multi-frame
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* image are available.
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*
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* @see #imageUpdate
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*/
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int FRAMEBITS = 16;
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/**
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* An image with a single frame, a static image, is complete.
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*
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* @see #imageUpdate
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*/
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int ALLBITS = 32;
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/**
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* An error was encountered while producing the image.
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*
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* @see #imageUpdate
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*/
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int ERROR = 64;
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/**
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* Production of the image was aborted.
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*
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* @see #imageUpdate
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*/
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int ABORT = 128;
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/**
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* This is a callback method for an asynchronous image producer to
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* provide updates on the production of the image as it happens.
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*
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* @param image the image the update refers to
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* @param flags a bit mask indicating what is provided with this update
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* @param x the x coordinate of the image
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* @param y the y coordinate of the image
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* @param width the width of the image
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* @param height the height of the image
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*
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* @see java.awt.Image
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*/
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boolean imageUpdate(Image image, int flags, int x,
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int y, int width, int height);
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}
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