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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @author Igor V. Stolyarov
* @version $Revision$
*/
package java.awt.image;
import java.awt.Image;
/**
* the ImageObserver interface is an asynchronous update interface
* for receiving notifications about Image construction status.
*/
public interface ImageObserver {
/**
* The Constant WIDTH indicates that the width of the image is
* available.
*/
public static final int WIDTH = 1;
/**
* The Constant HEIGHT indicates that the width of the image is
* available.
*/
public static final int HEIGHT = 2;
/**
* The Constant PROPERTIES indicates that the properties of the image
* are available.
*/
public static final int PROPERTIES = 4;
/**
* The Constant SOMEBITS indicates that more bits needed for
* drawing a scaled variation of the image pixels are available.
*/
public static final int SOMEBITS = 8;
/**
* The Constant FRAMEBITS indicates that complete frame of
* a image which was previously drawn is now available
* for drawing again.
*/
public static final int FRAMEBITS = 16;
/**
* The Constant ALLBITS indicates that an image which
* was previously drawn is now complete and can be drawn again.
*/
public static final int ALLBITS = 32;
/**
* The Constant ERROR indicates that error occured.
*/
public static final int ERROR = 64;
/**
* The Constant ABORT indicates that the image producing is
* aborted.
*/
public static final int ABORT = 128;
/**
* This method is called when information about an Image
* interface becomes available. This method returns true
* if further updates are needed, false if not.
*
* @param img the image to be observed.
* @param infoflags the bitwise OR combination of information flags:
* ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS,
* WIDTH.
* @param x the X coordinate.
* @param y the Y coordinate.
* @param width the width.
* @param height the height.
*
* @return true if further updates are needed, false if not.
*/
public boolean imageUpdate(Image img, int infoflags, int x, int y,
int width, int height);
}
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