Source Code Cross Referenced for PaintEvent.java in  » 6.0-JDK-Core » AWT » java » awt » event » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Core » AWT » java.awt.event 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001        /*
002         * Copyright 1996-2007 Sun Microsystems, Inc.  All Rights Reserved.
003         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004         *
005         * This code is free software; you can redistribute it and/or modify it
006         * under the terms of the GNU General Public License version 2 only, as
007         * published by the Free Software Foundation.  Sun designates this
008         * particular file as subject to the "Classpath" exception as provided
009         * by Sun in the LICENSE file that accompanied this code.
010         *
011         * This code is distributed in the hope that it will be useful, but WITHOUT
012         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014         * version 2 for more details (a copy is included in the LICENSE file that
015         * accompanied this code).
016         *
017         * You should have received a copy of the GNU General Public License version
018         * 2 along with this work; if not, write to the Free Software Foundation,
019         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020         *
021         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022         * CA 95054 USA or visit www.sun.com if you need additional information or
023         * have any questions.
024         */
025
026        package java.awt.event;
027
028        import java.awt.Component;
029        import java.awt.Rectangle;
030
031        /**
032         * The component-level paint event.
033         * This event is a special type which is used to ensure that
034         * paint/update method calls are serialized along with the other
035         * events delivered from the event queue.  This event is not
036         * designed to be used with the Event Listener model; programs
037         * should continue to override paint/update methods in order
038         * render themselves properly.
039         *
040         * @author Amy Fowler
041         * @version 1.29, 06/05/07
042         * @since 1.1
043         */
044        public class PaintEvent extends ComponentEvent {
045
046            /**
047             * Marks the first integer id for the range of paint event ids.
048             */
049            public static final int PAINT_FIRST = 800;
050
051            /**
052             * Marks the last integer id for the range of paint event ids.
053             */
054            public static final int PAINT_LAST = 801;
055
056            /**
057             * The paint event type.  
058             */
059            public static final int PAINT = PAINT_FIRST;
060
061            /**
062             * The update event type.  
063             */
064            public static final int UPDATE = PAINT_FIRST + 1; //801
065
066            /**
067             * This is the rectangle that represents the area on the source
068             * component that requires a repaint.
069             * This rectangle should be non null.
070             *
071             * @serial
072             * @see java.awt.Rectangle
073             * @see #setUpdateRect(Rectangle)
074             * @see #getUpdateRect()
075             */
076            Rectangle updateRect;
077
078            /*
079             * JDK 1.1 serialVersionUID 
080             */
081            private static final long serialVersionUID = 1267492026433337593L;
082
083            /**
084             * Constructs a <code>PaintEvent</code> object with the specified
085             * source component and type.
086             * <p>Note that passing in an invalid <code>id</code> results in
087             * unspecified behavior. This method throws an
088             * <code>IllegalArgumentException</code> if <code>source</code>
089             * is <code>null</code>.
090             *
091             * @param source     the object where the event originated
092             * @param id         the event type
093             * @param updateRect the rectangle area which needs to be repainted
094             * @throws IllegalArgumentException if <code>source</code> is null
095             */
096            public PaintEvent(Component source, int id, Rectangle updateRect) {
097                super (source, id);
098                this .updateRect = updateRect;
099            }
100
101            /**
102             * Returns the rectangle representing the area which needs to be
103             * repainted in response to this event.
104             */
105            public Rectangle getUpdateRect() {
106                return updateRect;
107            }
108
109            /**
110             * Sets the rectangle representing the area which needs to be
111             * repainted in response to this event.
112             * @param updateRect the rectangle area which needs to be repainted
113             */
114            public void setUpdateRect(Rectangle updateRect) {
115                this .updateRect = updateRect;
116            }
117
118            public String paramString() {
119                String typeStr;
120                switch (id) {
121                case PAINT:
122                    typeStr = "PAINT";
123                    break;
124                case UPDATE:
125                    typeStr = "UPDATE";
126                    break;
127                default:
128                    typeStr = "unknown type";
129                }
130                return typeStr + ",updateRect="
131                        + (updateRect != null ? updateRect.toString() : "null");
132            }
133        }
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