Source Code Cross Referenced for RenderingChangeEvent.java in  » 6.0-JDK-Modules » Java-Advanced-Imaging » javax » media » jai » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » Java Advanced Imaging » javax.media.jai 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * $RCSfile: RenderingChangeEvent.java,v $
03:         *
04:         * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
05:         *
06:         * Use is subject to license terms.
07:         *
08:         * $Revision: 1.1 $
09:         * $Date: 2005/02/11 04:57:21 $
10:         * $State: Exp $
11:         */
12:        package javax.media.jai;
13:
14:        import java.awt.Shape;
15:
16:        /**
17:         * Class representing the event that occurs when a <code>RenderedOp</code>
18:         * node is re-rendered.
19:         *
20:         * @since JAI 1.1
21:         */
22:        public class RenderingChangeEvent extends PropertyChangeEventJAI {
23:            private Shape invalidRegion;
24:
25:            /**
26:             * Constructs a <code>RenderingChangeEvent</code>.  The inherited
27:             * <code>getSource()</code> method of the event would return the
28:             * <code>RenderedOp</code> source; the inherited methods
29:             * <code>getOldValue()</code> and <code>getNewValue()</code>
30:             * would return the old and new renderings, respectively.  If
31:             * either the new rendering or the invalid region is null, the
32:             * data of the node's rendering need to be re-requested.
33:             *
34:             * <p> The invalid region should be <code>null</code> if there is no
35:             * area of the extant rendering which remains valid.  If the invalid
36:             * region is empty, this serves to indicate that all pixels within the
37:             * bounds of the old rendering remain valid.  Pixels outside the image
38:             * bounds proper but within the bounds of all tiles of the image are
39:             * not guaranteed to be valid of the invalid region is empty.
40:             */
41:            public RenderingChangeEvent(RenderedOp source,
42:                    PlanarImage oldRendering, PlanarImage newRendering,
43:                    Shape invalidRegion) {
44:                super (source, "Rendering", oldRendering, newRendering);
45:                this .invalidRegion = invalidRegion;
46:            }
47:
48:            /**
49:             * Returns an object which represents the region over which the
50:             * the two renderings should differ.
51:             *
52:             * @return The region over which the two renderings differ or
53:             *         <code>null</code> to indicate that they differ everywhere.
54:             *         An empty <code>Shape</code> indicates that all pixels
55:             *         within the bounds of the old rendering remain valid.
56:             */
57:            public Shape getInvalidRegion() {
58:                return invalidRegion;
59:            }
60:        }
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